CUBAN TELEPHONE EQUIPMENT SPECIFICATIONS

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP79T01049A002600030002-8
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 150
• Document Creation Date: December 9, 2016
• Document Release Date: March 6, 2000
• Sequence Number: 2
• Publication Date: January 15, 1963
• Content Type: MF

25X1A
/
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440EANDUM FOR:
15 January 1963
M3/COM
Cuban Telephone Equipment Specifications
Attached for your retention are eopies of RCA catalogs of
oureAtly ir use on the a',CMI 24 telelphone-channeI
oJave networir in Cuba and eataloc,s of equipment required to
i-wase the ea2acity of this network. to 120 tele one charreis.
TAt7 mterial 15 an unclassified enclosure
Additional copies ean be Obtained from the CIA. 11.-
request.
25X1A
GEOUP 1
4
1 7_1:c:eluded from automatic 1
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c..ac
25X1A
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MICROWAVE COMMUNICATION EQUIPM
INSTRUCTIONS
Microwave Belay Equipment
BASIC STATIONS
R'ADIO CORPORATION OF AMERICA
COMMUNICATION PRODUCTS DEPARTMENT, CAMDEN, NEW JERSEY
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WARN I NG I
Operation of electronic equipment in-
volves the use at high voltages which are
dangerous to life. Operating personnel
must at all times observe all safety regu-
lations. Do not change tubes or make ad-
justments inside the equipment with volt-
age supply on. Under certain conditions
dangerous potentials may exist in circuits
with power controls in the off Position
due to charges retained by capacitors. etc.
To avoid casualties. ALWAYS DISCHARGE AND
GROUND CIRCUITS PRIOR TO TOUCHING mem.
ABOUT FIRST AID
Personnel engaged in the installation,
operation and maintenance of this equip-
ment or similar equipment are urged to be-
come familiar with the following rules
both in theory and In the practical ap-
plication thereof. It is the duty of
every radioman to be prepared to give
adequate First Aid and thereby prevent
avoidable loss of life.
FIRST DEGREE BURN
SKIN REDDENED. Temporary treatment?Ap-
ply baking soda or Unguentine.
SECOND DEGREE BURN
SKIN BLISTERED. Temporary treatment--Ap-
ply baking soda, wet compress, white pe-
troleum jelly, faille jelly, olive oil, or
tea,
THIRD DEGREE BURN
FLESH CHARRED. Temporary treatment?Ap-
ply baking soda, wet compress, white pe-
troleum jelly, or foille spray. Treat for
severe shock.
FIRST AID
BACK PRESSURE?ARM LIFT METHOD
OF ARTIFICIAL RESPIRATION
(Courtesy of the American Red Cross)
I. Position of the subject (See Fig.
Place the subject in the face down. prone'
position. Bend his elbows and place the
hands one upon the other. Turn his face to
one side, placing the cheek upon his hands.
2. Position of the operator (See Fig. 2)
Kneel on either the right or left knee at
the head of the subject facing him. Place
the knee at the side of the subject's head
close to the forearm. Place the opposite
foot near the elbow. If it is more com-
fortable, kneel on both knees, one on
either side of the subject's head. Place
your hands upon the flat of the subject's
back in such a way that the heels lie just
below a line running between the armpits.
With the tips of the thumbs just touching,
spread the fingers downward and outward.
3. Compression phase (See Fig. 2)
Rock forward until the arms are approxi-
mately vertical and allow the weight of
the upper part of your body to exert slow.
steady, even pressure downward upon the
hands. This forces air out of the lungs.
Your elbows should be kept straight and
the pressure exerted almost directly down-
ward on the back.
4. Position for expansion phase (See Fig. 4)
Release the pressure, avoiding a final
thrust, and commence to rock slowly back-
ward. Place your hands upon the subject's
arms just above his elbows.
6. Expansion phase (See Fig. 5)
Draw his arms upward and toward you. Ap-
ply just enough lift to feel resistance
and tension at the subject's shoulders. Do
not bend your elbows, and as you rock
backward the subject's arms will be drawn
toward you. Then lower the arms to the
ground. This completes the full cycle.
The arm lift expands the chest by pulling
on the chest muscles, arching the back,
and relieving the weight on the chest.
THE CYCLE SHOULD SE REPEATED IZ TIMES
PER MINUTE AT A srrAor. UNIFORM RATE. THE
COMPRESSION AND EXPANSION PHASES SHOULD
OCCUPY ASOUT E0uAL TIME. THE RELEASE PE.
RiODS SE/NO OF MINIMUM DURATION.
Additional related directions:
It is all important that artificial res-
piration. when needed, be started quickly.
There should be a slight inclination of
the body in such a way that fluid drains
better from the respiratory passage. The
head of the subject should be extended,
not flexed forward, and the chin should
not sag lest obstruction of the respira-
tory passages occur. A check should be
made to ascertain that the tongue or for-
eign objects are not obstructing the pas-
sages. These aspects can be cared for
when placing the subject into position or
shortly thereafter, between cycles. A
smooth rhythm in performing artificial
respiration is desirable, but split-second
timing is not essential. Shock should re-
ceive adequate attention, and the subject
should remain recumbent after resuscita-
tion until seen by a physician or until
recovery seems assured.
s- I
FIGURE I
FIGURE 2
FIGURE 3
FIGURE 4
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FIGURE 6
S-2
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EQUIPMENT LOST OR DAMAGED IN TRANSIT
When delivering the equipment to you, the truck driver or carrier's agent will present a receipt for your signature.
Do not sign it until you have (a) inspected the containers for visible signs of damage and (b) counted the containers and
'compared with the amount shown on the shipping papers if a shortage or if evidence of damage is noted, insist that
notation to that effect be made on the shipping papers before you sign them.
Further, after receiving the equipment, unpack It and inspect thoroughly for concealed damage. This should be done within
13 days, if possible. If concealed damage is discovered Immediately notify the carrier, confirmed in writing and insist upon an
inspection and report.
In addition to the .above, the shortages or darnafes should also be reported to RCA, but do not return any damaged equipment
unless we have furnished complete return shipping instructions.
Transportation companies are required to adjust for damage resulting from their negligence and RCA will assist you, if,
necessary, in obtaining settlement. Accordingly, you should save all shipping papers, letters or invoices concerning the
shipment until it is certain that the equipment was delivered in good condition or until any damage has been adjusted.
REPLACEMENT PARTS
When ordering replacement parts, please give symbol, description, and stock number of each item ordered.
The part which will be supplied against an order for a replacement item may not be an exact duplicate of the original part.
However, it will be a satisfactory replacement differing only in minor mechanical or electrical characteristics. Such differences
will in no way impair the operation of the equipment.
The following tabulations list service parts and electron tube ordering instructions according to your geographical location.
SERVICE PARTS
LOCATION
ORDER SERVICE PARTS FROM:
Continental United States, Alaska and Hawaii
,
Service Parts Order Service, Bldg. 60, 19th & Federal Sts., Camden 5,
New jersey or through your nearest RCA Regional Office. Emergency
orders may be telephoned, telegraphed, or teletyped to RCA Einer-.
gency Service, Bldg. 60, Camden, N. j. (Telephone: WO 3-8000).
Dominion of Canada
RCA Victor Company Limited, 1001 Lenoir Street, Montreal, Quebec
or through your local Sales Representative or his office.
Outside of Continental United States Alaska,
Hawaii and the Dominion of Caned;
RCA International Division, Clark, N. J., U.S.A. or through your local
Sales Representative.
ELECTRON TUBES
LOCATION
ORDER ELECTRON TURES PROM: '
Continental United States, Alaska and Hawaii
Local Tube Distributor.
Dominion of Canada
RCA Victor Company Limited, 1001 Lenoir Street, Montreal, Quebec
or through your local Sales Representative or his office.
Outside of Continental United States' Alaska,
Hawaii and the Dominion of Canada
Local Tube Distributor or from: '
Tube Department
RCA International Division
30 Rockefeller Plaza
New York 20, New York, U.S.A.
If for any reason, it is desired to return tubes, please return them to the place of purchase.
PLEASE DO NOT RETURN TUBES DIRECTLY TO RCA WITHOUT AUTHORIZATION AND SHIPPING
INSTRUCTIONS.
It is important that complete information regarding each tube (including type, serial number, hours of service and reason
for its return) be given.
When tubes are returned, they should be shipped to the address specified on the Return Authorization form. A copy of the
Return Authorization and also a Service Report for each tube should be packed with the tubes.
Atlanta 3, Georgia
522 Forsyth Bldg.
jAdtson 4-7703
Dallas 35, rends
7901 Freeway *183
FLeetwood 2-3911
LIST OF RCA REGIONAL OFFICES
Boston 16, Mass.
Room 2301, John Hancock Bldg.
200 Berkley St.
HUbbard 2-1700
Hollywood 28, Calif.
RCA Bldg., 1560 N. Vine St.
H011ywood 9-2154
Branch?San Francisco 2, Calif.
420 Taylor St.
?RdwaY 34021 ,
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Chicago 54, 111.
1186 Merchandise Mart Plaza
DElaware 7-0700
KIMSdS City 6, 'Missouri
340 Dierks Bldg.
flArrison 1-6480
Cleveland 15, Ohio
1600 Keith Bldg.
CHerry 1-3450
New York 20, New York
36 W. 49th St.
jUdson 6-3800
Approved For Release 200,0/4/1?V : ltni1049A002600030002-8,
gm
TYPE CW-20A 11.00-20A1 AND 141A-24,A
System Doak ?Dale Stallions
Technical Data for System , a
11.10.1. .........
Description ... , 0111,????
Installation
UST OF CONTENTS
Initial Adjustments
Operation
Maintenance
Replacement Parts for Accessories
Duplex Filter
Description
?
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???'??? ???.
1triirr
?
?
? ?,? ? ? ? ? ? ? ? 4?446????????? ... ??#
'
????????
Replacement Parts List
Transmitter
Technical Data
Description
Maintenance
%
4
Replacement Parts List
.va. .............. ,?
04111?11',
Receiver/Modulator
Technical 1)ats
0000000
0000000 11.0111, ???????irle
? 0000
Description ...
.. ? ..........
li'esii?;40.?????????
ii?st 000
.
..... ? . 041 .... ????-????? 000000 ??????
S.3
Section S
SeCtiOft T
4146?????
Section RM
I ????????14.14.??????????????????? 0000 ..??????11144
Maintenance...............4 ?14,010 0. ?4' 4,0i01014.60?1???'101011?????1 .......... iv?4 0.011.00."
Replacement Pasts List 6+1 a
Terminal AFC Unit
,......,Technical Data
Description .. 440644r, ..... 4 .. 4404fb
Maintenance
..............
Replacement Parts List
Baseband Unit
Technical Data
Description
Maintenance
Replacement Parts List
Power Supply
' Technical Data
Description
Maintenance
Replacement Parts List
Repeater Servke Unit (when
Technical Data
Description ????
Maintenance
Replacement Parts List
Terminal Service Unit (when used)
Technical Data
Description
Maintenance
. .
Replacement Parts List
Service Channel Unit (when used)
Technical Data
Description 8
Maintenance
Replacement Parts List
used)
...
Section AFC
? ?'401 .. ii440* 6! ,P.ipibffil
,
'044,6 ...... ? . ? .. .????
SeCtion B
... ..... 401???????? . '000.610.06410r
????'????????????? . ' .............................. ???.11
S..
Section PS
84.6 d
Section RS
'Secion TS
Section SC?
Indicon Coder and Decoder Units (when Used) Section IU
Technical Data ........
Description
Maintenance
Replacement Parts List F 4 4,* ? . ? . . . s
1? . 0 .. ? . 4.4614 . ... 4406,416? .. ? ..... t.f0 . .. di11.6..SAfe
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S-4
Figaro S-I?Typical Terminal Rack
Figure S-2?Typical Drop Ropeetor Reek
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s-s
TECHNICAL DATA FOR SYSTEM
Frequency Range
1700.1990 mc (CW-20A/AW)
2450-2700 Inc (MM-26A/AW)
GENERAL CHARACTERISTICS
.Type of Modulation
Frequency Modulation
Type of Multiplex
Frequency division
Total Peak Deviation
.?1.5 mc
Type of Repeater
Heterodyne
Transmitter Power Output
3.0 watt (CW-20A/AW)
1.0 watt (MM-26A/AW)
Frequency Stability
?.02%
Modulation Frequency Range
3 kc to 160 kc
3 kc to 600 kc .(wideband system)
Service Channel Frequency Range
300 cycles to 3 kc
Receiver Bandwidth
6 mc
Type of Frequency Control
Quarts crystal reference AFC
Number of Channels
30
120 (wideband system)
Nominal Transmitting Modulation Sensitivity
per Channel
?26 dbm
Nominal Receiving Output Level Per Channel
?io dbm
?20 (wideband system)
Receiver Noise Figure
8 db (CW-20A/AW)
9 db (MM-26A/AW)
A-c Power Source
? 115 v, *5%
A-c Power Required (Repeater Station)
? 800 watts (approx.) (CW20A/AW)
960 watts (approx.) (MM26A/AW)
A-c Power Required (Terminal Station)
550 watts (approx.) (CW20A/AW)
650 watts (approx.) (MM26A/N97)
Frequency Spacing at Repeater
40 mc
Tower Rigidity (For a 6 ft. Reflector)
?2? degrees
Temperature Range
?20?C to +50?C
WEIGHTS AND DIMENSIONS
Weight
Height
hid. filters
W idth
Depth
Term
Thru
Rep.
Drop
Reis.
Ind. Doors
es Handles
Ind. Pier.
Supply
1
Term. Rep,
Cabinet Rack . . .
Frame Rack
541 lbs.
436 lbs.
572 lbs.
470 lbs.
580 lbs.
478 lbs.
881/2" 93"
88" 921/2"
22"
21"
25"
18"
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S-6
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T.O. 31 R5-4-A-21
DESCRIPTION
tion with Microwave Communication Section, RCA
Commercial Electronic Products, Camden, N. J.
This equipment is intended for use with frequency
division, single side band multiplex equipment. Any
or all of the channels can be multiplexed to carry up
to 16 supervisory control or telemetering functions.
High or low speed telegraph or teleprinting tones can
be transmitted. Also 'sections of the modulation band
can be used for broadband systems such as high
speed facsimile. Signalling channels can be inserted
directly without use of voice-band multiplexing
equipment, thereby simplifying the insertion or drop-
ping of signalling channels and improving the
reliability.
Each station equipment consists of separate units
mounted in an 84" open rack or standard cabinet.
The units are the panel mounting type and all the
power and other inter-unit connections are made by
means of Jones plug terminating cabling thereby
facilitating quick and easy unit changing. R.F. con-
nections between units are made by coaxial cabling.
Service channel voice ? communication and fault
locating facilities are included as an integral part
of the equipment. The faulty repeater station and
the type of trouble can be quickly identified at the
fault identifying station and the service rapidly re-
stored in the event of a station failure. Frequency.
control networks are provided in all station equip-
ment insuring constant on-frequency operation.
The basic system uses heterodyne repeaters with
a frequency shift of 40 mc (either up or down).
Only two r-f channels are required under normal
conditions with the transmitting frequencies alter-
nating at successive stations. Transmission is by
frequency modulation.
Typical system transmitting frequencies will be
found in Tables S-2 and S-3. Other allocations can be
arranged within the 1700 to 1990 mc and 2450 to
2700 mc frequency band.
Power supply requirements call for 115 volts
50/60 cycles. Voltage regulation of 5% is rec-
ommended.
The RCA Type CW-20A (MM-20A) and MM-26A ?
Microwave Relay Equipments are frequency modu-
lated radio relay systems designed specifically for two
way point to point communication by telephone, tele-
graph, teletype, facsimile, etc., all carried on simul-
taneously over a single radio circuit without inter-
action or interference between the services. They are
intended for use by companies requiring an efficient
system of supervisory control, telemetering, teleprint-
ing, etc., such as electric power, pipe line and trucking
companies; government agencies and many ? others.
The equipment is designed for reliable unattended
operation and so may be installed at remote locations
not easily accessible. Weather, atmospherics and elec..
trical interference have negligible effect on the opera-
tion of the system.
There are three basic types of microwave relay
station equipments, the terminal station, thru repeater
station and drop repeater station. The stations .of a
relay system are located within line-of-sight of each
other at fixed points along the route which the system
is to service. A basic relay system consists of two ter-
minal stations and one or more repeater stations. A
terminal station originates the signals and the repeater
station receives the microwave signal and retransmits
it to the next repeater or terminal. The same thing
occurs, in the opposite direction, to a signal emanat-
ing from the other terminal station. There are two
types of repeater stations; the thru repeater station
which picks up and relays on to the next station
the original microwave transmission, and the drop
repeater station which in addition to relaying the
microwave signal has the facilities to insert multi-
plex signals into and tap off multiplex signals from
the relay channels. A thru repeater station can be
made a drop repeater station by the simple addition
of a baseband unit. See figure S-3 for a block
diagram showing a system consisting of a thru
repeater, a drop repeater and two terminal stations.
There are a number of operational options possible
by the use of various combinations of available equip-
ment uniti."'Ilie equipment required for the 12 basic
system combinations is shown in Table S-1.
The microwave relay equipment is extremely flex-
ible in its application and lends itself to many varia-
tions from the basic systems. There are combinations
using drop repeaters, terminal repeater stations,
repeater stations bridged by direct wire instead of
microwave, etc Information concerning its adaptation
to a particular application can be obtained by consulta-
Terminal Station
For the following terminal station description
refer to the terminal station portion of the block
diagram of figure S-3. Input channel frequencies from
the multiplex equipment are fed into the baseband
unit. In the baseband unit this signal is amplified and
combined with the service channel communication
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T.O. 31R5-4-A-21
S-7
TABLE S-1
LIST OF EQUIPMENT
FOR BASIC STATION OPTIONS
Equipment Unit
MI
Options*
_
1
2
3
4
5
6
7
8
9
10
11
12
Transmitter
31132-1
x
x
x
x
x
x
Transmitter
31132-2
x
x
x
x
x
x
Receiver/Modulator
25969
x
x
x
Receiver/Modulator
25969
x
x
x
Receiver/Modulator
31174
x
x
X
Receiver/Modulator
31174
x
x
x
Terminal AFC Unit
31492
x
xxx
x
xxx
xxx
a
Baseband Unit
31910
x
x
x
x
x
x
Baseband Unit
31910
a
x
x
x
x
x
Power Supply
31494
x
x
x
a
x
x
a
x
a
x
a
x
Repeater Service Unit .
31495
x
x
x
x
Terminal Service Unit
31496
a
x
x
x
Service Channel Unit
31140
x
x
x
a
x
a
x
x
Indicon Coder and Decoder Units
31138
{ 31139
x
x
x
x
. 1
BASIC SYSTEM CHARACTERISTICS
FOR THE BASIC STATION OPTIONS
Cberacteristks
i
Options*
1
2
3
4
5
6
7
8
9
10
11
1.2.,"
Frequency Range (1700 mc to 1990 mc)
x
x
x
x
x
x
Frequency Range (2450 mc to 2700 mc)
x
x
x
x
x
x
Modulation Frequency Range (3 kc to 160 kc)
a
x
x
x
x
x
Modulation Frequency Range (3 kc to 600 kc)
x
x
a
x
x
x
Voice Channels (up to 30)
x
x
x
x
x
x
Voice Channels (up to 120)
x
x
x
x
x
x
Remote Indications (6)
x
x
x
x
,
Remote Indications (10)
x
x
x
x
*Each of the system options listed in this table are also available with standby equipment at either terminal thru
repeater or drop repeater stations.
and fault signals (300 cycles to 3 kc) from the service
unit. The baseband unit feeds the signal at the proper
voltage level into the modulator section of the re-
ceiver/modulator unit.
In the modulator unit the amplitude modulated
signals from the baseband are applied to a 40 mc a coaxial cable to a 70 mc amplifier in the trans-
f-m oscillator for a, peak deviation of ?-1.5 mc. mitter unit.
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This 40 mc frequency modulated output is 'combined
with a 110 mc signal in the modulator i-f mixer
stage. This 110 mc signal is obtained from the
terminal AFC unit. The resulting difference fre-
quency of 70 mc is amplified and then coupled thru
S-8
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TYPICAL SYSTEM FREQUENCIES
TABLE 5-2
CW-20A (MM-20A) SYSTEM
Frequency
Designation
Mc
Transmitted
Frequency
Mc
Received
Frequency
Me
Trans./Rec.
L.O. Freq.
Mc
AFC
L.O.
Freq.
Mc
Divide
By
i
AFC
Crystal
Ml
AFC
Crystal
Freq.
Al
1855
1895
1925.
1875
48
31687-TI
39.0625
A2
1895
1855
1825
1875
48
31687-T2
39.0625
A3
1865
1905
1935
1885
48
31687-T3
39.2708
A4
1905
1865
1835
1885
48
31687-T4
39.2708
AS
1875
1915
1945
1895
48
31687-T5
39.4792 '
AG
1915
1875
1845
1895
48
31687-T6
39.4792
Al
1965
1925
1895
1945
48
31687-Ti
40.5208
A8
1925
1965
1995
1945
48
31687-T8
40.5208
, A9
1975
1935
1905
1955
48
31687.T9
40.7292
A10
1935
1975
2005
1955
48
31687-Tb0
40.7292
All
1985
1945
1915
1965
48
31687-TI 1
40.9375
Al2
. 1945
1985
2015
1965 .
48
31687-T12
40.9375
A13
1710
1750
1780
1730
44
31687-T13
39.3182
A14
1750
1710
1680
1730
44
31687-T14
39.3182
A 15
1720
1760
1790
1740
44
31687-T15
39.5455
A16
1760
1720
1690
1740
44
31687-T16
39.5455
All
1730
1770
1800
1750
44
31687-T17
39.7727
A.18
1770
1730
1700
1750
44
21687-T18
39.7727
A19
1820
1780
1750 ?
1800
44
31687-T19
40.9091
A20
1780
1820
1850
1800
44
31687-T20
40.9091
A21
1830
1790
1760
1810
44
31687-T21
4 11364
An
1790
1830
1860
1810
44
31687-T22
41.1364
A23
1840
1800
1770
1820
44
31687-T23
41.3636
A24
1800
1840
1870
1820
44
31687-T24
41.3636
TABLE 5-3
MM-26A SYSTEM
Frequency
Designation
Transmitted
Frequency
Mc
Received
Frequency
Mc
Trans./Rec.
L.O. Freq.
Mc
AFC
L.O.
Freq.
Mc
Divide
By
AFC
Crystal
Ml
AFC
Crystal
Freq.
Mc
.
A65
2455
2495
2525
2475
64
31687-T65
38.6719
AGG
2495
2455
2425
2475
64
31687-T66
38.6719
A67
2505
2545
2575
2525
64
31687-T67
39.4531
A68
2545
2505
2475
2525
64
31687-T68
39.4531
A69
2515
2555
2585
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31687-T69
39.6094
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2555
2515
2485
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31687-T70
39.6094
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2525
2565
2595
2545
64
31687-T71
39.7656
A72
2565
2525
2495
2545
64
31687-T72
39.7656
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2535
2575
2605
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39.9219
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2575
2535
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2555
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31687-T74
39.9219
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2585
2625
2655
2605
64
31687-T75
40.7031
A76
2625
2585
2555
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64
31687-T76
40,7031
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2595
2635
2665
2615
64
31687-T77
40.8594
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2635
2595
2565
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31697-T78
40.8594
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2605
2645
2675
2625
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31687179
41.0156
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2605
2575
2625
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31687-T80
41.0156
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2635
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31687-T81
41.1719
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2585
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31687-T82
41.1719
-
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29_: CIA-RDP79T01049A002600030002-8
T.O. 31R5-4-A-21
The transmitter local oscillator generates the
basic microwave signal which is heterodyned in the
transmitter mixer stage with the 70 mc signal from
the modulator section of the receiver/modulator
unit. The output of this mixer may be either the
sum or difference frequency of the two applied
components. The system plan determines whether
the upper or lower side band mixer output will
, be used. The mixer output is coupled to the r-f
amplifier. The r-f carrier output from this final
stage is passed through a filter network to a dipole
or waveguide radiator and parabolic reflector which
serves as antenna for both receiver and transmitter.
The transmitter filter unit is sufficiently selecti'%
to prevent spurious transmitter emissions. Each
terminal station contains a terminal AFC loop which
functions in the following manner. The transmitted
frequency is compared to a multiple of a reference
quartz crystal oscillator and the resultant difference
frequency is applied to a reactance tube which
controls the frequency of the 110 mc signal feeding
the modulator i-f mixer. The change in the 110
mc frequency in response to an error signal keeps
the transmitted frequency correct if either the
transmitter oscillator, 40 Inc modulated oscillator
or the 110 inc signal tend to drift in frequency.
This keeps the terminal station exactly on frequency
and by the nature of the heterodyne type of relay
system, controls the frequency of the entire repeater
station chain.
The received frequency modulated signal is passed
thru a filter network and then to the receiver input.
This filter prevents the transmitter signal from enter-
ing the receiver. The received microwave signal is
combined with a portion of the transmitter local
oscillator output in a mixer cavity using a silicon
crystal detector. The frequency of the transmitter
local oscillator determines the receiver i-f frequency.
If this changes from the nominal value of 30 mc, a dc
voltage is produced in the receiver discriminator out-
put. This dc, through the action of the transmitter
AFC circuit corrects the transmitter local oscillator to
keep the heterodyne signal obtained from the receiver
r-f mixer always centered on the pass band of the i-f
stage. The 30 mc i-f signal thus produced is amplified
thru six stages of amplification and two limiting
stages before being applied to the 30 mc discrimina-
tor. The discriminator circuit demodulates the 30 mc
i-f signal to extract the composite multiplex and
service signals from the 30 mc carrier. At an option
1, 4, 7 or 10 station these signals are amplified and
separated into service channel and multiplex channel
frequencies. The multiplex signals are then amplified
in the baseband unit to the proper level for the multi-
S-9
plex equipment. The service channel and fault signal
frequencies after separation from the composite signal
are amplified in the receiver/modulator and supplied
directly to the terminal service unit.
At an option 2, 3, 5, 6, 8, 9, 11 or 12 station the
composite signal is supplied to the baseband unit
which separates and distributes the multiplex signals
to the multiplex equipment and the service channel
and fault signals to the service unit.
Thru Repeater Station
A thru repeater station receives the microwave
signals from a terminal or a repeater station and
retransmits them to the next repeater or terminal
station. It contains no facilities for dropping or
inserting multiplex signals.
A thru repeater station contains no terminal AFC
unit or baseband unit. The frequency of the
repeater station is controlled by the terminal station
so a terminal AFC unit is unnecessary. A baseband
unit is only needed when multiplex signals are
dropped or inserted.
The receiver/modulator and transmitter units
function differently in a repeater station than in
a terminal station as follows: (refer to the thru
repeater station portion of the block diagram of
figure S-3). The 70 ,mc output of the modulator i-f
mixer is the sum frequency of the 30 mc i-f receiver
signal and the 40 mc oscillator output. The 110 mc
oscillator/fault relay combination in addition to its
function of reporting a receiver failure to the service
unit also serves as an i-f mixer heterodyne oscillator
to keep a transmitter signal on the air if the received
signal fails. Since ,the signal radiated from the
transmitter would be very noisy if the incoming
signal fails, it is necessary that provision be made
for effectively replacing the noise being fed to the
i-f mixer by the 30 tric i-f, with a quiet carrier. In
case the received signal fails, the absence of a. signal
will be indicated by zero d-c output from the 6th
i-f grid rectifier since the 30-mc intermediate fre-
quency will no longer be present. The dc output
from the 6th i-f is normally utilized to bias off the
110 mc oscillator. When the dc from the 6th i-f
stage disappears, the oscillator will become active
and provide a 110 mc signal to the mixer which in
combination with the signal from the 40 mc oscil-
lator will provide the necessary 70-inc output for
the transmitter.
The 110 MC oscillator also operates a noise tip-
pression relay which disables the receiver limiter
stages thereby preventing the noise voltages from
Approved For Release 2000/08/29 : CIA-RDP79T.01049A002600030002-8
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
T.O. 31R5-4-A-21
S-10
reaching the i-f mixer or the multiplex equipment. At
a terminal station the 110 mc oscillator becomes a dc
amplifier for operating the fault and noise suppres-
sion relays only.
At standby stations a transmitter or receiver equip-
ment failure will cause the standby radio equipment
to be switched into operation. A lockout circuit in
the receiver/modulator unit differentiates between a
loss-of-signal condition and an actual equipment
failure.
The modulation band is passed through the
repeater station with a minimum of distortion since
it is not demodulated. The instability in transmitted
frequency which can be introduced at a repeater
station is negligible.
Drop Repeater Station
A drop repeater station is simply a dint repeater
station with a baseband unit added. (Refer to the
drop repeater station portion of the block diagram of
figure S-3.) This permits the insertion or dropping of
multiplex channels. The thru channel repeater service
will not be interrupted in any way.
Terminal Repeater Station
A terminal repeater station consists of two
terminal equipment racks connected back-to-back.
For long systems it is advisable to install a terminal
repeater after approximately the 15th repeater
station. Systems which cover great distances should
have a terminal repeater station inserted every 400
miles or less so that maintenance centers will not
be so widely separated. A terminal, (repeater station
can originate, stop, transfer or shift in carrier fre-
quency any channel or combination of channels if
appropriate channelling equipment is used. The
maintenance service channel and fault locating system
are also broken at these points to avoid the difficulty
of having too many repeaters reporting faults to one
operating unit.
SERVICE CHANNEL AND FAULT
LOCATING EQUIPMENT
Each terminal and repeater has voice communica-
tion facilities for full party line operation between
all stations. An audio tone is utilized as the ring-
ing signal for party ? line calling between stations.
Fault locating facilities are provided as part of the
system. The failure of the radio equipment or the
occurrence of some other fault causes a coded signal
to be generated at any unattended station. This tone
is .transmitted along with the multiplex signal on the
microwave carrier. This signal when received at an
attended station is separated from the multiplex signal
and passed to the indicating equipment where a
combination of lights show up on a lamp indicator
panel. Using the code for the particular system, the
station operator can use the lamp panel to identify
which unattended station is having trouble and the
type of failure. These indications will be repeated at
frequent intervals. A number of remote-indications
can be displayed consecutively on the lamp panel.
A lockout circuit in each unattended station allows
only one fault transmission at a time to be transmitted
down the circuit, thus preventing intermingling of
several transmissions which would result in an in-
correctly recorded lamp display.
The system provides for the reporting to an
attended station a number of remote-indications from
the unattended stations. Some of these are: failure of
the radio equipment units, failure of the emergency
power supply and others, including those specified
by .the customer.
In systems using service channel and indicon equip-
ment, the lockout circuit of the receiver/modulator
unit performs the function of initiating the transmis-
sion and the identification of a loss-of-signal
condition.
EQUIPMENT RACKS MI-31025-M04,
MI-30922-A84 and MI-31130
The installations at all stations are made using
either of three styles of racks. MI-31025-H84 is an
84" high, 19" wide channel, open frame type rack.
MI-30922-A84 is an 84" high, 19" wide channel,
cabinet rack with doors both front and back. Doors
have handles with built in locks to keep unauthorized
personnel from tampering with the equipment. Side
panels MI-305444184 are required to complete the
cabinet assembly. Stylized Rack MI-31130 is an 84"
high, 19" wide channel open frame type rack. Side
panels and a front door are available if desired. The
back is left open for easy accessability to the equip-
ment units.
CABLES
For interunit rack cabling information for terminal,
through repeater and drop repeater stations consult
the cabling diagrams of figure S-8. Each type cable
is made in several lengths with the suffix number of
the MI designation denoting the cable lengths. There
are several general types of antenna cabling installa-
tions. The requirements of each antenna installation
is different so that the type of coaxial cabling and
associated components required can only be ascer-
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29 :-CIA-RDP79T01049A002600030002-8
1 TO 90
CHANNELS
SOO.. TO
1000 ???? EACH
/It
CARRIER
TELEPHONE
sucrirtsx
aoui POINT
a
MULTIPLEX .3.3,V
V
II-
'2 a no I- r-- ?it
=
II REPEATER SERYICE
UNIT MI-31495 FAULT
DESIGNATIONS
NOTES WHEN EXTENDING 33 TERMINAL G J2 OF. THE 1NDICON CODER,1411- 31499-J45 IS USED.
THE 33 CONDUCTOR CABLE OF THIS MI IS WIRED TO TERMINAL BLOCK PROVIDED WITH IT;
CONNECTING I TO I 2 1021- - - 33 TOSS.
2-WHEN EXTENDING 33 TERMINAL 7J2 21 TERMINAL 7J1 OF THE INDICON DECODER,MI -
31499 K45 # MI-31499 L45 ARE USED. THE CABLE OF MI-31459 K45 15 WIRED TO THE
TERMINAL BLOCK PROVIDED WITH IT; CONNECTING I TO 1,2 TO - --$ 3310 33. I ERMMALS
THRU 17 or 7.33 (M1-31499 L45) ARE. CONNECTED TO 34 THRU 50 ,RESPECTIVELY, OF TERMINAL
BLOCK PROVIDED WITH MI-31439 K45. TERMINALS IS THRU 21 ARE CONNECTED TO TERMINALS
47 THRU 50 ,RESPECTIVELV Of STU.
STI3t
C-755379
Noun S-11-11.? Tormisatien Pone M141156.-Coasectien Diagram
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
NOTE.' THIS SCHEMATIC PERTAINS TO A DROP REPEATER.
OTHER TYPES OF STATIONS USE THE SAME CABLES AS
ARE ILLUSTRATED HERE IN CONFIGURATIONS SHOWN
IN STATION CABLING DIAGRAMS.
NOTE. 2, CABLES MI-31499 -C35. - C50 -C7I ARE ASSEMBLED
AS SHOWN. THE SUFFIX NUMBER DESIGNATES THE
LENGTH OF THE CABLE IN INCHES.
NOTE*3.CABI4S MI-31499-036 IS ASSEMBLED AS SHOWN.
THE SUFFIX NUMBER DESIGNATES THE LENGTH OF
OF THE CABLE IN INCHES.
CABLE MI -31499 -C7I
(SEE NOTE ?2)
CABLE MI- 31499-050
CABLE 756936 -50I
CABLE MI-31499- C35
CABLE MI-31499-636
(SEE NOTE *3)
I J6 POWER
? 1-17 + 250 V DC
+ SOO V OC
0 GND
0 4 UNREG
0 51--P, COMMON} 115 V AC
0 6 P REG
E-W TRANSMITTER
MI- 31132-1
J
2J11 POWER
foil + 250 V OG
1021
0
4311-111.. ?NC;
0
051--=} II5 V AC
0 6
E -W RECEIVER /MODULATOR
MI- 25869
J
1 J6 POWER
0 + 250 V DC
021+ 500 V DC
O31 GND
0 44 UNREG
1051 --11: COMMON 115 VAC
0 6 REG
W -E IIRANSMITTER
MI-31132-1
1
2 JII POWER
250 V DC
021
103OND
1 0 4
1.? 5r-112":,} 115 V AC
0 6
W-E RECEIVER/ MODULATOR
MI-25969
23 JI CODER
1-071
0
1 0 4
1 0 5
[ ISIS]
23 J10
POWER
CI
02
03
04
06
+ 250 V DC
? GND
1115 V AC
SERVICE CHANNEL UNIT
MI -31140
6JI CODER
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0
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1---9
0 5 11*
10
L 0 15j
INDICON CODER
MI-31I38
4.15 POWER
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O2
1031 OND
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0 4
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MI-31910
J COMMON
lou-+ 250 V DC
1021
0 4
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0 51---)1107COMMON\ 115
1061REG
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5J4 E W
0
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05.
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+500 V DC
OND
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REG
POWER SUPPLY
MI-31494 -B
04 5SI
11.13[?I LOWER
0 1
0 2
0 3
04
lc' 5
0 e
INPUT 1475'2
118 V AC,
8810
0
TERMINATION PANEL
Ml- 31056
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
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and Drop Repeater Station Equipment.
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
MICROWAVE COMMUNICATION EQUIPMENT
T.O. 3110.4A-21
Transmitter MI-31132-1C
? TECHNICAL DATA
DESCRIPTION
MAINTENANCE
REPLACEMENT PARTS
RADIO CORPORATION OF AMERICA
COMMUNICATION PRODUCTS DEPARTMENT, CAMDEN, NEW JERSEY
ApimadiFicgsRplease 2000/08/29: CIA-RDP79T01049A002600030002-8 18-33241-2
DU 539
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
T.O. 31R5-4-A-21
TECHNICAL DATA
Power Input:
a. Pil. Heaters and Blower. 95 watts at 115 volts..
50/60 cycle A.C.
b. Plate Supply: 65 milliamps at 250 v dc
300 millhunps at 500 v dc
, Frequency Range
1700-1990 megacycles
Modulated Signal Input
70 megetcycle FM Signal from the receiver/modulator
unit
?
R-F Bandwidth
8 mc
Peak Carrier Deviation
?1.5 megacycles
Transmitter Power Output
3 watts
Tube Complement
Symbol Type ,
1V1 12AT7
1V2 2C39A
1V3 2C39A
" 1V4 2C39A
? 1V5 6CL6
1V6 2E26
.1V7 35C5
Crystal
Symbol \Type Function
ICR1 1N21B RF Rectifier
1CR2 1N48 RF Rectifier
T-1
Fomeeloto
DC Amplifier
Local Oscillator
Transmitter Mixer
RF Amplifier
70 mc i-f Amplifier
70 mc i-f Amplifier
Om Cathode, Current Regu-
lator
Weight and Dimensions
Weight-25 lbs.
' Height-10"
Depth back of panel: (6" plus 1" allowance for air
passage. 11" with air filter)
Depth front of panel: 4"
Width: 19" Rack Mounting
DESCRIPTION
This Transmitter Unit is designed for installa-
tion in either a standard 19" open rack or cabinet
and is used in both terminal and repeater stations.
It provide; a frequency modulated r-f output in
the frequency range of 1700 to 1990 mc. 0
The transmitter unit contains the equipment to
generate and amplify the microwave carrier. The
oscillator frequency is determined by tuning reso-
nant cavity 1Z1A by means of the top left tuning
screw. (This and the three other cavity tuning
screws are located on the cavity assembly mounted
on the front panel.) This frequency is coupled di-
rectly to the mixer cathode resonant cavity 1Z1B
which is tuned by the lower left tuning screw. The
oscillator frequency is mixed with the 70 mc car-
rier from the modulator section of the receiver/-
modulator unit. This 70 mc frequency modulated
signal is injected into the cathode circuit of mixer
tube 1V3. The resultant frequency, the sum or
difference in accordance with the system plan, is fed
thru mixer anode tuning cavity 1Z1C to the r-f
amplifier 1V4. 1Z1C is tuned to the output fre-
quency of the mixer stage by the upper right cav-
ity tuning screw. The r-f amplifier stage is tuned
to the same frequency as the mixer output. This
Approved For Release 2000/08/29 : CIA-RD
tuning is done in resonant cavity 1Z1D by the lower
right cavity tuning screw. (All cavity tuning screws
are turned out for an increase in frequency).
The plate tuning cavity 1Z1D of the r-f amplifier
contains three pickup devices. The one connected
to jack 1J2 absorbs a comparison sample for the
terminal AFC unit. A loop transfers to 1J3 the r-f
energy for the antenna. A slot is used to obtain
energy to operate r-f monitor 1M2, the combina-
tion output meter and fault relay.
Seventy mc amplifier stages 1V5 and 1V6 amplify
the 70 mc signal from the receiver/modulator to
raise it to the proper amplitude before injection into
the transmitter mixer circuit.
R-f monitor 1M2 is an r-f output indicating
meter which also acts as the transmitter fault in-
dicating device. The r-f energy for operating 1M2
is rectified by crystal 1N21B in cavity 1Z1D.
MONITOR ADJUST 1R14 controls the amount of
current flowing through 1M2 to keep the meter
pointer on scale. When the output of r-f amplifier
1V4 drops to a certain predetermined value a cir-
cuit is closed inside 1M2 which energizes a trans-
mitter fault reporting relay in the service unit. The
value at which the 1M2 relay reports a fault is in-
P79T01049A002600030002-8
NI
IKI
IVI
Approved For Release 20F008/211:1t5A4RAMT01049A002600030002-8
IR5
I V7
IV5
IJ2
ICI6
IJ6
Figure T-1?Transmitter?Front View
dicated by the red pointer which can be set manu-
ally by a control knob on the front of 1M2.
DC amplifier 1V1, relay 1K1 and AFC motor 1B1
and associated circuits constitute the transmitter
oscillator frequency control section. The following
is the sequence of events that cause this equipment
to function: A portion of the transmitter local
oscillator output is coupled by a cable, attached to
jack 1J1, to the receiver r-f mixer in the receiver/-
modulator unit. The transmitter oscillator fre-
quency and the received microwave frequency
determines the receiver 30 mc i-f. If the trans-
mitter local oscillator drifts the resultant change in
the receiver i-f causes a dc component to appear in
the receiver 30 mc discriminator output. This dc is
carried through the service unit to the transmitter
jack 1J4 of the transmitter. From terminal 1 of
jack 1J4 it is applied to the control grid of the 1-2-3
section of dc amplifier 12AT7 (1V1).
When the transmitter operates on the sideband
above the L.O. (local oscillator) frequency, the
connections to motor 1BI are as shown in figures
T-3 and T-4. (Motor 1B1 is actually two motors
mounted on a single shaft. The F and B terminals
chown on the schematic are the power connections to
the "front" (F) and "back" (B) motors of 1BI. The
"front" motor refers to the one nearest the panel.)
Contact 7 of relay 1K1 is connected to the F ter-
minal of IBI and contact 4 of 1K1 is connected to
the B terminal of 1B1. If the receiver i-f increases
for any reason, a positive dc voltage at 1V1-2 from
the receiver discriminator will cause relay 1KI to
function so that 1B1 runs in a counterclockwise
direction as indicated by the lighting of the +
(112) lamp. This will turn the tuning loop in
cavity 1ZIA to increase the L.O. frequency so that
the receiver i-f is again 30 mc. A decrease of re-
ceiver i-f causes a negative dc voltage at 1V1-2
which will move the tuning loop in a clockwise
direction, as indicated by the lighting of the ?
(111) lamp, and decrease the L.O. frequency so that
the receiver i-f is again 30 mc.
For lower sideband transmitter operation the
connections to 1BI are: contact 7 of relay 1K1 is
connected to the B terminal of 1BI and contact 4
of 1K1 is connected to the F terminal of 1B1. When
1B1 is connected in this manner a positive dc volt-
age at 1V1-2, caused by a receiver i-f increase, will
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
Approved For Release 2000/68/29 : CIA-RDP79T01049A002600030002-8
T.O. 31R5-4-A-21
cause the 1Z1A tuning loop to turn in a clockwise
direction and light the + (.112) lamp. This will
decrease the L.O. frequency until the receiver i-f is
again 30 me. A negative voltage at 1V1.2 caused by
a receiver i-f decrease will cause the IZIA tuning
loop to turn in a counterclockwise direction and
light the ? (III) lamp. This will increase the L.O.
frequency until the receiver i-f is again 30 mc.
The dc amplifier bias control 1R5 is adjusted so
that when the receiver discriminator dc output is
at zero voltage the AFC motor 1B1 stops running.
In order to prevent the AFC motor 1B1 from
moving the tuning loop out of position during ini-
tial installation or when servicing the station
equipment, an AFC motor disabling switch has
been provided. With the AFC Motor switch 1S3
open (OFF) the 115 v ac to 1BI is disconnected.
Meter Switch 1S1A in conjunction with test
meter IMI supplies a means of making the follow-
ing measurements: On the 250 and 500 positions
of 1S1A, meter 1M1 registers the two B+ voltages
from the power supply. On the OSC, MIX and
AMPL positions of 1S1A, 1M1 measures the cathode
--------""?"'Current of the oscillator IV2, mixer 1V3, and RE
amplifier IV4 respectively. The + and ? positions
of 1S1A are used when positive and negative
external voltage readings are made in this and other
units by means of a test lead.
The transmitter oscillator, mixer and r-f anipli-
fier tubes are cooled by blower 1B2 and if for any
reason the blower should stop, the air operated
switch 1S2 breaks the ac power to their filament
transformer to prevent these tubes from overheating.
The cathode current of the oscillator 1V2 con-
tains a 35C5 ballast tube. This is a current regulat-
ing device which prevents the cathode current of
1V2 from varying greatly from the value set by
1R30. If the cathode current of 1V2 tends to in-
crease or decrease appreciably the resistance of the
filament of 1V7 will increase and decrease accord-
ingly to maintain the current through it at a nearly
constant value.
CONTROLS
a. The Local Oscillator Tuning Screw (Upper
left) of cavity 1Z1A varies the resonant frequency
of the plate circuit cavity and so determines the
frequency of the oscillator. (Turning the screw
T-3
out increases the resonant frequency of the cavity.
This applies to all four of the transmitter cavity
tuning screws.)
b. The Local Oscillator Cathode Tuning Screw
(Lower left) of cavity 1Z1B varies the resonant
frequency of the cathode cavity of the local oscil-
lator and mixer cathode circuits. This tuning con-
trol has only a negligible effect on the oscillator
frequency.
c. The Mixer Plate Turning Screw?(Upper right)
of cavity 1Z1C varies the resonant frequency of the
mixer tuning cavity. It is tuned either to the local
oscillator frequency plus the 70 mc i-f carrier or to
the local oscillator frequency minus the 70 mc i-f
carrier in accordance with the system plan.
d. The RF Amplifier Tuning Screw (Lower
right) of the cavitY 1ZID varies the resonant fre-
quency of the plate tuning cavity. It is tuned to the
mixer output frequency.
e. The OSC control (1R30) is a screwdriver ad-
justed potentiometer which controls the cathode
current ? of the oscillator tube 1V2 by varying its
cathode bias.
f. The , AMPL control (1R29) is a screwdriver
adjusted potentiometer which controls the cathode
current of the r-f amplifier tube 1V42 by varying
its cathode bias.
g. The MONITOR ADJUST control (1R14) is
a screwdriver adjusted potentiometer that controls
the amount of rectified r-f output from the r-f am-
plifier plate cavity which flows thru RF MONITOR
1M2. It is iet so that the indicator of IM2 remains
on scale. This control is adjusted in conjunction
with the Setting of the red pointer on RF MONI-
TOR IM2.
h. The METER SW (IS1) allows various cur-
rent and voltage readings of the transmitter and
associated units to be observed on test meter 1M1.
Position 250 measures 250 v dc B+ from the
power supply. (1000 volts full scale)
Position 500 measures 500 v dc B+ from the
power supply. (1000 volts full scale)
Position OSC measures the cathode current of
r-f oscillator 1V2. (200 milliamps full
scale)
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
T-4
Approved For Release 2000/08/29: CIA-RDP79T01049A002600030002-8
T.O. 31R5-4-A-21
Position MIX measures the cathode current of
mixer 1V3. (200 milliamps full scale)
Position AMPL measures the cathode current
of r?I amplifier 1V4. (200 milliamps full
scale)
*Position measures positive voltages. (200
microamps full scale)
*Position ? measures negative voltages. (200
microamps full scale)
* From test points in this and other units by means of a
test lead connected to the METER jack.
L The DC AMPL BIAS control, (1R5) varies the
cathode bias of the 6-7-8 section of dc amplifier
1V1, the AFC relay control tube.
j. The Test Meter (1M1) ( to the right of the
meter switch) is used in conjunction with meter
, switch 1S1 to measure various circuit values in the
transmitter unit and, by means of a plug-in test lead,
to make current measurements in the other units.
k. METER pinjack ( 1J7) is the test lead con-
' nection when test meter 1M1 is used to measure
voltage and current values in associated units.
1. The 4.1? MONITOR r-f meter and relay (1M2),
a combination r-f output meter and fault relay,
gives a relative indication of r-f carrier output
and functions as a fault reporting relay when the
r-f output reaches a predetermined low value.
m. The LO. (local oscillator) coaxial cable
terminal (1J1) is used for supplying a portion of
the local oscillator energy to the receiver r-f mixer
stage.
n. The A.F.C. coaxial cable terminal (1J2) is
used for transferring a portion of the transmitter
output signal to the AFC mixer in the terminal AFC
unit. Only used for terminal stations.
o. The 70 MC INPUT coaxial cable terminal
(1J5) is the input connection for the coaxial cable
carrying the 70 mc if signal from the receiver/-
modulator.
p. The A.F.C. MOTOR INDICATOR (lamps
111 and 112) show when the AFC motor is running
and in which direction. When the motor is cor-
recting the local oscillator frequency, one of the
lamps is lit and when the frequency correction is
complete the lamp is extinguished.
q. The A.F.C. MOTOR SWITCH 1S3 is used for
opening the 115 v ac line to AFC motor 1B1 to dis-
able it during installation or servicing.
r. The 70 MC INPUT signal jack 1J9 is used for
checking the 70 mc signal input level from the
receiver/modulator.
? s. The AFC LOOP INDICATOR shows the posi-
? tion of the AFC tuning loop in the local oscillator
cavity. The pointer, when moved, changes the angle
of the loop in the cavity. When the pointer is at
the 0 position, the loop is at approximately 45?
from the vertical, the correct position of the loop
in the cavity.
MAINTENANCE
General Notes
If the transmitter power output is decreasing
the following notes may facilitate isolating the
difficulty:
a. First, check the 70 mc drive to the transmitter
mixr by turning off the 500 volts supply. The
. "MIX" reading should be greater than 35 ma. (The
40 ma figure listed in the INITIAL ADJUSTMENT
section of the system instructions is the expected
minimum for new tubes.) The reading obtained on
M1 when 1J9 is connected to 1J7 should be at least
30a.
If the "MIX" reading is below 35 ma check the
70 mc signal voltage iinput from the receiver/modu-
lator. The 30 iLa reading at 1J9 is equivalent to 1
volt at 1V5-3. If this value is less than 1 volt the
Approved For Release 2000/08/29
receiver/modulator is not delivering enough drive
to the transmitter and the correction will have to
be made in the receiver/modulator unit. If the in-
put to 1V5 is sufficient, check both 1V5 and 1V6
tubes and replace if necessary.
b. Second, check the quality of the oscillator tube
by noting how much its cathode current increases
as the tube changes from a non-oscillating to an
oscillating condition. (The bottom oscillator slug
cin be detuned to stop oscillation.) The current
should increase by approximately 3:1 for a good
tube. If the increase is less than 1.51 the tube
should be replaced.
c. If the oscillator is supplying adequate drive
to the mixer the mixer tube cathode current (meter
: CIA-RDP79T01049A002600030002-8
Approved For Release 2009139 jaitTlaTe1049A002600030002-8
IM?
11314
It IC
IMI
Si IIC29 1R2H 1R38 1R27 1R30 1C12
Wei
STK. NO
95228
(PART OF
182)
--- 188
1C29
IC39
IC I
1812
IC2 1813 STK. NO. IC3 STK. NO.
56100 56100
(PART OF (PART OF
1X8) IX7)
IC30 la
IC31 IJ5 ILI
iXV5 IL5 IL3 IXV6 IL6 IL9 1X10 1R23 185
1L4
Figure T-2?Transmitter?Rear View
switch at MIX) should drop to roughly 50% of the
normal value when the 70 mc cable is removed. If
this decrease is of the order of only 10%, a point of
marginal operation has been reached. The mixer
cathode current is determined in part by the
oscillator drive. If the mixer cathode current ex-
ceeds 125 ma, the oscillator cathode current should
be reduced.
d. A poor 2C39A amplifier is frequently re-
vealed by an ina'bility to get adequate cathode cur-
rent, with sufficient drive from the mixer, as the
cathode variable resistor (1R29) is decreased.
When less than 75 ma of "AMPL" cathode current
is obtained with 1R29 set at minimum the amplifier
tube should probably be replaced.
e. If the transmitter fails completely it may be
caused by a defective 2C39A electron tube or the
breakdown of capacitors 1C19, 1C23 or 1C26. If
one of these capacitors is shorted due to dust and
moisture or if certain elements of tubes 1V2, 1V3
or 1V4 become shorted, then the 500 v B+ power
is short circuited and fuse 5F16 in the power sup-
ply will be blown.
f. Variable resistor 1R14 "MONITOR AD-
JUST" is used to adjust the operating point of
meter relay 1M2. A suggested setting of 1R14 is that
which will give a 1M2 reading of 150 p a. Set the
red hand of 1M2 at the meter reading below which
the transmitter output should not fall. Meter 'Re-
lay 1M2 will report a transmitter fault to the service
unit when the transmitter output falls to this value.
g. Both the transmitter AFC motor and the
blower motor have lifetime lubricated bearings.
The grease sealed bearings of the blower section of
the blower-motor should be inspected periodically
and replaced with new bearings when necessary.
The normal life of the bearings is between three
and four years.
h. If the blower motor runs but the tube fila-
ments do not burn, check the operation of the air
operated switch 152.
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
T.O. 31R5-4-A-21
T-6
Transmitter AFC Circuit
As d-c amplifier tube 1V1 ages, D.C. AMPL.
BIAS potentiometer 1R5 must be readjusted to keep
the i-f frequency of the receiver/modulator centered
at 30 mc. When the range of adjustment provided
by 1R5 is no longer adequate to center the i-f, 1V1
must be replaced.
Transmitter AFC Circuit Test
If the transmitter AFC circuit fails to respond to
the dc correction signals from the discriminator of
the receiver/modulator, the d-c amplifier may be
the cause.
Check the sensitivity of the d-c amplifier 1V1
as follows (with the AFC motor 11211 connected for
upper side band operation as shown in Figure T-3):
1. Apply + .15 volts to pin 1 of jack 1J4 and
ground. This voltage should cause the AFC motor
indicator light, marked +, to light.
2. Apply ? 15 volts to pin 1 of jack 1J4 and
ground. This voltage should cause the AFC motor
indicator light, marked ?, to light.
3. Check the action of the clutch by moving the
loop indicator by hand.
70 MC Circuit Alignment
NOTE: The test items specified in this
alignment procedure refer to the test
equipment items listed in the test equip-
ment tables of the system instructions.
a. Apply the output of the 70 mc sweep gen-
erator ( test item 18), with markers, to 1V6-5. (Tube
shields of 2E26 and 6CL6 and the shields of trans-
former IT1 must be in place.)
b. Connect the CRO (test item 4) to the cath-
ode of 1V3 (2C39A mixer tube).
c. Turn on the 115 volt a-c and 250 volt d-c
supplies.
d. Adjust 1T1 and 1C33 for correct alignment.
The response is that of an over-coupled double-
tuned circuit with peaks approximately 12 mega.,
cycles apart.
NOTE: Should it be impossible to align
this stage the reason is, most likely, that
either of the two circuits is not tuned to
70 mc ? 1 Inc. The resonant frequencies
of the two circuits are easily checked with
test item 12.
TYPICAL TRANSMITTER VOLTAGES AND METER READINGS
The following are approximate voltages existing between the indicated tube pins and ground as measured
with a voltohmyst with 100,000 ohms in series with the measuring probe. All voltages are dc unless other-
wise noted.
Pin
Pin
Pin
Pin
Pin
Pin
Pin
Pin
Pin
Tube
Type
Function
1
2
3
4
5
6
7
8
9
1V1
12AT7
DC ampl.
90
0
1.8
0 0
0
250
90
92
6.3 ac
1V5
6CL6
2E26
70 mc. ampl.
70 mc. ampl.
2.3
15
0
0
117
185
0
15
6.3 ac
0
228
15
2.3
6.3 ac
117
?
Plate
?1V6
cap 250
The following are typical readings of test meter 1M1 for the various positions of "METER SW" 1S1:
250v-50 ilia
500v-100 tta Meter connected as a voltmeter of roughly 1000 volt full scale reading
OSC-70 ma
MIX.-100 ma max.? 60 ma min.
AMPL.-100 ma max.
+In these positions the meter is connected to an external
}
? unit quantities
--Approve or e ease
III I: ?
probe for use in testing other
-?? ?
I IA ? II .111 III
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
T.O. 31R5-4-A-21
e. Connect the CRO to 1V6-3, connect the sweep,
generator to 1V5-2, and adjust 1L3, 1L4, and 1L5
for the correct response. The response curve is
nearly flat with 3 db points 10 mc apart.
f. Connect the CRO to 1V5-8, connect the sweep
generator to Pin No. 1 of the 70 mc amplifier 2V11
and connect the 70 MC OUTPUT jack 2J9 to the
70 MC INPUT jack 1J5 of the transmitter and ad-
just al and 1L2 for the, correct response.
g. Connect the CRO to the cathode of 1V3 to
check the overall response.
IMPORTANT
If the repair of cavity 1Z1 is required and if the
removal of the mounting assemblies of electron
tubes 1V2, 1V3 and 1V4 is necessary it is important
that these parts be very carefully positioned upon
reassembly. If the opening in the plates of these
assemblies are not in line the tubes are likely to be
REPLACEMENT
T-7
broken when inserted. For proper installation of
these tube mounting assemblies use the following
instructions:
I. Install the ring assembly in the holes of the
partition between the two cavity sections and
tighten the screws.
2. Install the assembly that holds the cathode
and filament terminals (small end) of the tubes
but leave the mounting screws very loose. ?
3. Install the assembly that holds ?the plate
(large end) terminal of the tubes but leave the
mounting screws loose.
4. Insert a 2C39A tube allowing all parts to
center about the tube. Tighten all screws with the
tube in place. Remove the tube.
The installation of tubes 1V2, 1V3 and 1V4 may
now be done without danger of damage to the
tubes.
PARTS LIST
Symbol No.
Stock No.
Drawing No.
Description
1131
94203
8832092-1
Motor: timing motor and gear unit, (AFC Drive) 110 v. 60 cy.
1112
216921
741276-4
Blower: 115/230 v. 50/60 cy., 3300 RPM
94204
741276-2
Motor: for blower 1B2, 115/230 v. 50/60 cy. 3300 RPM,
pt. of 1132
95228
8830675-2
Bearing: ball, for blower motor, pt. of 1B2
CAPACITORS .
1C1 to 1C3
735715-363
Paper:, 0.01 p.f, +10%, 1000 v
IC4
94189
984002-121
Mica: 1000 pozf, ?10%, 500 v.
,
IC5 to 1C8
94190
449696-1 -
Ceramic, 820 Auf, +100 -0%, 500 v.
1C9
95319
735717-633
1
Ceramic, 220 ;JO ?20%, 500 v.
1C10,1C11
94190
449696-1
Ceramic, 820 pilf +100 -0%, 500 v
1C12
735715-25
Paper, 0.1 4 ?20%, 200 v
, 1C13 to 1C15
203760
8828585-3
Ceramic, feed thru type, 1000 AO +80 -20%, 500 v.
1C16 ,
1C17
1C18 to 1C27
208 503
990195-2
Paper, 4 Af ?10%, 330 v. ac., for blower motor
Not Used ,
Part of 1Z1
1C28
94190
449696-1
Ceramic, 820 +100 -0%, 500 v.
1C29 -
735715-175
Paper, 0.1 p.f ?10%, 400 v
1C30, 1C3 1
735715-119
Paper, 0.033 if ?20%, 400 v
1C32
93716
984015-218
Ceramic, 22 pp.f +5%, 500 v
1C33
20 3761
88 19 214-1
Variable, ceramic trimmer, 4.5/28 ??f
1C34
95319
735717-633
Ceramic, 220 PO ?20%, 500 v i
1C35
Not Used '
1C36
214667
44290 1-154
Electrolytic, 100 A f, 50 v.
1C37, 1C38
215957
984002-661
Silver mica, button type, 25 p.p,f t10%, (Part of IZD
ICRI
67876
1N21B
Rectifier: germanium diode 1N21B
1CR2
203954 .
1N48
Rectifier: germanium diode 1N48
111,112
10 1857
872291-9
Lamp: neon, starting volts 65 v. ac, 90 v. dc min bay base
1J1,1J2
94205
456989-501.Connector:
female, coaxial, chassis mounted of 1Z1) less
,
1J3
98557
460 231-50 1
- 1/4" lg. cavity loop
Connector: female, coaxial, chassis 'mounted with 13/32" lg.
loop and teflon beads
1J4
28 50 7
18 149 4-3
thrinector: male 6 contact, chassis mounted
1J5
94205
8845666-1
Connector: female, coaxial, chassis mounted
1J6
28 507
181494-3
Connector: male, 6 contact, chassis mounted
1J7
93678
742565-1
Connector: pin jack, for 0.080 dia., pin
1J13
18534
181494-4
Connector: female, 6 contact, chassis mounted
1J9, 1J10
93678 '
, 742565-1
Connector: pin jack, for 0.080 dia. pin
1K1
94206
8834407-1
Relay" differential polarized, sp., 1 pos. null seeking coils
?
? roved For Release
2)00/08/29
: CIA-RDINISIE01049A402600030002-8
Approved For Release 2000/08/29: CIA-RDP79T01049A002600030002-8 ,
T.O. 31R5-4-A-21
T-8
Symbol No.
Stock No.
Drawing No.
Description
ILI.
94207
629132-522
Coil: adj. iron core, 3 turns of 0.0126 dia, wire on form
0.9 7B' 1g.
IL2
94208
629132-524
Coil: adj. iron core, 5 turn. of 0.0126 dia. wire on form
0.920 lg.
IL3
94245
629132-517'Coil:
adj. iron core, 11 turns of 0.0126 dia, wire on form
0.920
1L4
94239
629132-527
Coil: adj. iron core, 15 turns of 0.0126 dia, wire on form
0.920 lg.
1L5
94211
629132-520
Coil: adj. iron core, 6 turns of 0.0126 dia, wire on form
0.9 20 lg.
1L6
94040
8834424-501 .
Reactor: iron core 2.5 microhenry
1L7
217800
941524-245
Reactor: RF choke, 6.8 microhenry
1L8
Part of 1Z1 ,
1L9
217800
941524-245 ?
Reactor: RF choke, 6.8 microhenry
1L10
98425
8886 16 1-6
Reactor: RF choke, 2.5 mh, 50 ma
1L 11
57239
8898641-2
Reactor: RF choke, 0.84 microhenry, 1000 ma
208637
883209 1-2
Core: tuning, iron threaded type, 1/4-28 x 3/8" lg. with
, fibre nut and spring washer. (for ILI, 1L2, 1L3, 1L4,
1L5)
?
1M1

94213
456986-1
Meter: dc, 0.200 ma '
1M2
94214
8834409-1
Meter: dc, special, 0-200 ma, with switch and contaeulocking
winding, single contact low limit adj.
1P1
2E1454
, 18 1494-2
Connector: male, 6 contact, cable mounting type
RESISTORS:
Fixed, Composition, Unless Otherwise Specified
1111
82283-35
4.7 meg. ?20%, % w '
1R2
Not Used
1113
82283-139 ,
150 ohm ?5%, % w
1114
8 2283-89
180,000 ohm ?10%, % w
1115
94039
737829-30
Variable, comp., 5000 ohm t10%, 2 w
.
1116
99126-72 ,
6800 ohm ?10%, 2w
1R7, 1R8
99126-194
30,000 ohm ?54, 2w
1119 .
99126-209 ,
120,000 ohm 35%, 2w
11110
Not Used
11111 to 11113
5928 2
8825410-54
Wire wound, 50, ohm +10%, 10 w '
11114
20 3068 '
737829-32
Variable, comp. 50,000 ohm ?10%, 2 IV
.11115
1R16
8 228 3-19 3 '
82283-64 ' '
27,000 ohm ?5%, % w
1500 ohm *10%, % w '
11117
8 228 3-50
100 ohm ?10%, % w
11118
82283-68
3300 ohm ?10%, % w
11119
90496-79
27,000 ohm ?10%, 1 w
11120
82283-13
1000 ohm t20%. % w
11121
82283-64
1500 ohm t10%, % w
11122
82283-58
470 ohm ?10%, % w
11123
90496-82
47,000 ohm ?10%, 1 w
11124
82283-50
100 ohm ?10%, % w
11125
82283-74 ,
10,000 ohm ?10%, 1/, w
11126 to 11128
56 327
8871557-11
Wire wound, 0.66 ohm ?1%, 1 w, meter shunt
'
11129, 11130
95312
180639-8
Variable, wire wound, 500 ohm ?10%, 25w
11131 ?Not
Used
11132 '
82283-249
5.6 meg. ?5%, 'A w .
11133
82283-50
100 ohm ?10%, 'A w
11134
8 228 3-249
5.6 meg. ?5%, % w
11135,1R36
8 2283-9 1
270,000 ohm ?10%, % w
11137 ,
8 228 3-74
10,000 ohm ?10%, % w
11138
9 4377
458572-26
Wire wound, 100 ohm ?5%, 5 w
11139
Not Used
151
9419 3
458908-1
Switch: rotary, wafer, single section, single circuit 7 pos.,
non-shorting
1S2
59 479
449277-1
Switch: rotary, snap action, SPST, normally open contacts,
125 V. ac, (air interlock)
1S3
4879 1
187454-2
Switch: toggle, SPST, 3 app, 250 v. ac or dc
1T1
203762
88 19 222-501
Transformer: RF, adj. core, 70 mc
1T2
' 207287
469743-1
Transformer: filament
1X1
94880
904055-2
Socket: tube, 9 pin min.
1
Approved For Release 2000/08/29: CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
T.O. 31115-4441 ?
T-9
Symbol No.
Stock No.
Drawing No.
-
Description .
1X2 to 1X4
Part of 1Z1
1XS
9 4880
943405E4
Socket: tube, 9 pin, min.
1X6
68590
9 9 39 14
5acket: tube eta. octal, natural phenolic .
1X7,1X113 '
88344254
Pilot Light Assembly
9 4121
Jewel: pilot light clear jewel only less socket and lamp
(pt. of 1X7 and 13(8)
56100
Socket: pilot light socket only less jewel and lamp (pt. of
1X7 and 131.8)
1X9
68590
99100-3
Socket: tube, std. octal, black phenolic '
13(10
94879
. 737867-18
Socket: tube 7 pin min.
1Z1
213898-A
647661-501
Cavity Assembly: transmitter, tuning range, 1700-1990 mc (The
following parts also stocked)
94270
8831010-1
Bushing: Textolite 0.499 OD. x 0.470 I.D. x 0.1601 g.,, mixer
capacitor insulating
9 420 5
456989-501
Connector: Female, coaxial, chassis mtg. less %lg. cavity loop
?....-
207374
8903740-501
Contact: Beryllium copper, grid contact ring, less Osc. loop,
for 2C39 A tubes
.
207375
8903740-502
Ontact: Beryllium copper, grid contact ring, with Osc. loop,
for 2C39A tubes
207376
890 37 49-50 1
Contact: Beryllium copper, cathode contact ,ring, for 2C39A
tube
207378
8832042-2
Contact: Beryllium copper, filament contact stud, for 2C39A
tubes
216922
7 5030 2-503
Contact: Beryllium copper, plate contact ring, for 1V 4 (2C39 A
tubes) with insulating ring
2169 22
750 30 2-504
Contact: Beryllium copper plate contact ring, for 1V2, 03,
(2C39 A tubes) less insulating ring
207377
8903730-1
Core: Brass, #5/8 " - 24 threaded type 1-7/8 " lg. overall,
cavity tuning
,
207379
9 4269
88310 12-2
88 310 11-1
Insulator: Laminated phenolic, 7/8 "O.D. x 0.116 1.D. x 1/16"
thick, with 3/16" dia, off set hole, filament contact Insulating
for 2C39-A Tubes
Nut: Brass, knurled, I." -32 inside thread, 3/4" I.D. opposite
,
side 1-1/16 "O.D. x 5/32 for nixer capacitor
95395
874927-6
Nut: Brass, #5/8 - 24 Hex, tuning core locking
203766
89 29 50-3
Washer: Mica, 1/2" 0.D. x 0.484 I.D. x .006 thick filament
contact insulating for 2C39-A tubes
207380
8903734-1
Washer: Spring, Beryllium copper, 21/32"I.D. x 25/32 0:D. x
0.15 thick tuning core locking
?
.
Miscellaneous
9438 5 -
8832079-1
Boot: Blower, wool gabardine, 2-81/32" dia. x 29g.
211661
8813040-501
Coil: A.F.C. Loop & Shaft assembly
9 38 56
185290-1
Connector: Male, pin jack, cable mtg.
207701
888550-1
Connector: Tube cap, for 1V6
213900
8819241-1
Contact: 2C39 tube radictor plate, less lead
9478 4
88 330 25-4
Cushion: Arc drive assy. mtg. rubber 7/89g. x 1/ 4x 3/ 16", with
V 16"wide x 1/8 deep channel,supplied in bulk piece Ing.
9438 2
8034421-1
Insulator: Textolite bead, 9/32" lg. x 0.447 O.D. x 0.254 I.D.
(1CRL & 1C4 mtg.)
30075
712336-507
Knob: round bakelite, pointer type, for 1S1
9438 3
8832071-501
Lever: 1S2 switch activating lever and plate assembly
94381
8831054-1
Screw: Thumb, #6-32 x 15/16" lg. overall, with 13/32" dia. x
3/8" lg. knurled hd. cover plate retaining.
56359
8858642-3
Shield: tube, 9 pin min. 1. 15/16" lg. .
94387
8834442-501
Spring: Helical, mtd. on plate 1-5/16" sq. Blower shock mtg.
3 req'd.
94386
8832080-1
Strap: Steel, 0.0179 thick x 11-1/8" ig. x 1/2" wide blower
bootclamping, 2 req'd.
210897
99369-3
Shield: tube, 7 pin min., 2-1/4" lg.
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
T.O. 31R5-44-21
T-11, T-12
IJ4
1341
SERVICE
11:W5.
4.7IWS
IC 26
SOO= -
IRS
0-51
116
468K
70 MC. INfosT
14
IWO sRi
1000
10
Rn
4
ICH
=620
POw
621
33 4E17
IC K. a---aS
414R T Sumut
VIOLET
It3 620
62.0 IL,
I SIA ISIS
METE SWITC
1141 200
1134
4.7.
1St
IP'
5.6 MEG-
0 ALL. CAPACITOR VALUES GIVEN IN WAIF AND
ALL. RESISTOR VALUES GIVEN IN OH MS UNLESS
OTMERWISE SPECIFIED.
NOTES
REPLACEMENT SLCAPENS, vnEE
THI6 viorE F THIRY HAVE
FOUR LEAD3.
wont's
Nol AS Swaim edmiesitTE0 ren wren
Sear NANO 001111Mmetason Lawn SCE
11141140 aPaRATION OwTeRCNAP?GE
Celmlwecriorill ILIL P.
Figure T-3?Treasmitter--ScheNaNc? Diereal
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
WIMP-SEE .01.
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
MICROWAVE COMMUNICATION EQUIPMENT
Receiver Modulator
....
MI-25969 Wide-Band (For CW-20 Systems)
MI-31174 Wide-Band (For MM-26 Systems)
MI-25969-1 Narrow-Band (For CW-20 Systems)
MI-31174.1 Narrow-Band (For MM-26 Systems)
? TECHNICAL DATA
? DESCRIPTION
? MAINTENANCE
? REPLACEMENT PARTS
RADIO CORPORATION OF AMERICA
COMMUNICATION PRODUCTS DEPARTMENT, CAMDEN, NEW JERSEY
PRINTED IN U.S.A. 1B-33362-I
WA 611
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29: CIA-RDP79T01049A002600030002-8
RM-1
TECHNICAL DATA
Power Input:
a. Filament Heaters:
b. Plate Supply: 140
Frequency Range
1700.1990 megacycles
2450-2700 megacycles
Receiver Band Width
6 megacycles
Receiver Noise Figure
9 db (M1-25969)
.8 db (M1-31174)
1.F. Frequency
30 mc
R.F. Input impedance
50 ohms
Carrier Operated Relay Sensitivity
Cirt1 = 12 db max.
Baseband Output for t 1.5 mc Peak Deviation
1.2 v rms
Baseband Output Frequency Range
3 kc to 50 kc
Service Channel Output for i75 kc Peak Deviation
0.61 v rms
Service Channel Frequency Response
300 cps to 3 kc t 2 db
Service Channel Signal-to-Noise Ralo
(below t 75 kc peak deviation)
35 db
Modulator input for t 1.5 mc Peak Deviation
0.95 r
46 watts at 115v, 50/60 cycle se
milliampa at 250 v de
(M1-25969)
(M141174)
Relays
Symbol
2K1
2K2
*:2K3
?Unction
Receiver Fault
Noise Suppression
Standby Lockout
Crystals
Symbol Type 'Unction
2CR1 1N21D RF Mixer
M1-25969
1N23E
MI-31174
2012 0(705 Rectifier
2C1i3 aaos First Limiter
2014 0(705 First Limiter
2015 0(705 Second Limiter
2016 C1(705 Second Limiter
2017 0(705 RF Rectifier
2CR8 0(705 Third Limiter
2CR9 0(705 Third Limiter
Tube Complement
Symbol fy0e
2V1 6CB6
2V2 6036
2V3 ' 6C06
2V4 6CR6
2V5 6C116
2V6 6CB6
2Aq 6CB6
2V8 6CB6
2V9 CA2
2V10 .AS'
2V11 6C116
2V12 6AH6
2V13 12AT7
2V14 12A17
2V15 6C116
2V16 12AX7
*2V17 12AX7
*2V18 12AT7
2V19 6AH6
rune t ion
First i-f Amplifier
Second i-f Amplifier
Third i-f Amplifier
Fourth i-f Amplifier
Fifth i-f Amplifier
Sixth i-f Amplifier
First Limiter
Second Limiter
Voltage Regulator
Modulator Mixer
70 MC Amplifier
FM Modulator
40 MC Oscillator
Fault Oscillator
Baseband Amplifier
Service Channel Amplifier
Lockout Amplifier
Lockout Amplifier
Driver
2V20 6A116 Driver
2V21 6AL5 Discriminator
Weight and Dimensions
Weight - 15 lbs.
Height - 12"
Depth back of panel: 2-7/8"
Depth front of panel: 4"
Width: 19" Rack Mounting
* Required when receiver is operated with standby equipment.
Supplied with Terminal or Repeater Switching Unit.
Not included with Receiver/Modulators MI-25969 and MI-31174.
DESCRIPTION
The Receiver/Modulator is designed for mount-
ing in either a standard 19" open rack or cabinet
and is used in both terminal and repeater stations.
The unit has two main functions. The receiver
section amplifies and demodulates the incoming f-m
signal from a terminal or repeater station and
delivers the .3 to 600 kc information to the base-
band and/or service units. The modulator section
provides the transmitter with a 70 mc f-m carrier,
modulated with the .3 to 600 kc multiplex and
service channel signals. In a receiver at a repeater
station the modulation on this 70 mc carrier also
includes the incoming modulation on the 30 mc
i-f signal.
Receiver
In the receiving section the incoming microwave
signal is first converted to a 30 mc i-f. This is
accomplished by mixing the microwave signal with
a sample of the transmitter local oscillator frequency.
These two frequencies are always 30 mc apart in
accordance with the system plan. Refer to the system
instructions for Typical Systems Frequencies. This
mixing is done in mixer cavity 2Z1 which receives
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2V6
2V7 2V10 2V6
2V5 2VII 2V4
2V3
2V 2
2 VI
Figure RM-1?Receiver/Modulater?Front View
the microwave signal through a coaxial cable from
the receiving filter unit. This cable is connected to
cavity terminal 2)1 on the back of the chassis. A
sample of the transmitter local oscillator frequency
is fed by means of a coaxial cable from terminal 1JI
of the transmitter to terminal 2)2, labeled LOCAL
OSC., of the mixer cavity 21.I. The difference fre-
quency is generated by the mixer cavity crystal 2CRI
and delivered to the grid of the first 30 mc i-f stage.
The screwdriver adjusting control on the front of
2/1 resonates the cavity to the correct frequency.
Coupling loop 2)2 couples the local oscillator energy
into the mixer cavity. The 30 mc output of cavity
2/1 is amplified by 6 stages (2V1 thru 2V6) of i-f
amplifiers to a sufficiently high level so that proper
limiting action can take place in the two limiting
stages 2V? and 2V8. Each of the two limiting stages
contain dual limiting circuits. Besides the limiting
that occurs in the electron tubes, additional limiting
action is performed in the circuits containing crystals
2(:R3 and 2(R4 of the 1st limiter stage and crystals
2CR5 and 2CR6 of the 2nd limiter stage and crystals
2CR8 and 2CR9. The 30 mc output of the 2nd
limiter stage is fed to the two parallel drivers 2V19
and 2V20. Voltage regulator 2V9 provide a regulated
150 volts dc for the screens of the two driver stages,
2V19 and 2V20. The outputs of the driver are fed
to discriminator 2V21, driver 2VI9 feeds the low
tuned section of the discriminator, driver 2V20
feeds the high tuned section. The fm signal is
demodulated and the 300 cycles to 600 kc com-
ponent is delivered to the baseband amplifier, 2V15.
The output of 2V15 is connected to plug 2)12 for
delivery to the baseband unit at terminal and drop
repeater stations. At thru repeater stations the 300
cycle to 3 kc portion of the band is amplified by
the service channel amplifier. 2VI6 and its output
is connected to plug 2)12 for delivery to the service
channel unit. A connection to terminal 1 of jack
2)13 from the discriminator output provides the
dc amplifier of the transmitter AFC circuit with
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the dc correction voltage when the transmitter local
oscillator drifts off frequency.
Modulator
In the modulator section, mixer 2V10 produces
the 70 mc i-f signal which modulates the transmitter
microwave carrier. Amplifier 2V11 amplifies the
70 mc i-f output of the modulator i-f mixer which
is then coupled by coaxial cable to the transmitter
by means of 70 MC OUTPUT jack 239. The source
of the two signals that supply modulator i-f mixer
2V10 with its heterodyning frequencies differ for
each type of station as follows:
a. At a terminal station the 70 mc subcarrier out-
put of the modulator i-f mixer 2V10 is the difference
frequency of a 110 mc and a 40 mc signal. The 40 mc
signal is the output of oscillator 2V13 and contains
the multiplex and service channel signals from the
baseband unit. The 110 mc frequency is received
from the terminal AFC and is coupled through a
coaxial cable to the 110 MC INPUT jack 238 of the
receiver/modulator. At terminal stations only, inter-
nal bus connection "P" must be made to jack 238,
connection "0" made at jack 2312, coil 2L47 shorted,
and-connection "L" omitted. (The letters "P", "0"
and "L" refer to connections found on the receiver/
modulator schematic of figure RM-8.) Adding con-
nection "P" feeds the 110 mc frequency from the
terminal AFC unit to the modulator i-f mixer 2V10.
Removing connection "L" disconnects the receiver
30 mc signal from 2V10. Shorting 2L47 prevents
2V14 from operating as a 110 mc oscillator. Adding.
connection "Cr maintains the proper baseband out-
put load impedance when only one receiver/modu-
lator unit is Used as at a terminal station. The
amount of baseband signal applied to 2V12 is deter-
mined by the setting of MODULATOR GAIN con-
trol ?ZR109 which is adjusted at the factory so that
,
the modulation sensitivity of all receiver/modulator
units will be the same.
b. At drop repeater stations the 70 Inc subcarrier
output of the modulator i-f mixer 2V10 is the sum
frequency of a 30 mc and a 40 mc signal. The signal
from the 40 mc oscillator 2V13 and frequency modu-
lator 2V12 contains the 300 cycle to 600 kc multiplex
and service channel frequencies added 600 at this
station. The 30 mc signal comes from the receiver
1st limiter stage output and contains the intelligence
modulated on the received microwave signal.
c. The modulator section of a thru repeater station
RM-3
is the same as that of a drop repeater station except
the 40 mc oscillator signal to the modulator-mixer
stage 2V10 contain only 300 cycles to 3 kc service
channel information (voice communication and fault
tone pulses) from the repeater service unit.
In repeater stations the 30 mc frequency to the
modulator mixer stage 2V10 comes from the 1st
limiter (2V7) output circuit. Be certain that internal
connection L is made when the receiver/modulator
is used in either a drop repeater or a thru repeater
station and removed when used at a terminal station.
Fault Circuit
The fault circuit consists of fault oscillator 2V14
and relays 2K1 and 2K2. This circuit performs, its
functions when the i-f amplifier fails or when the
microwave signal from the previous transmitter is
absent. When either of the above conditions exists
a lowering of the normal positive dc voltage from
crystal 2CR2 of the six receiver i-f stage to the con-
trol grid #2 of fault oscillator 2V14 causes the
following action to occur:
a. At a drop or thru repeater station the 110 mc
fault oscillator 2V14 normally is inoperative, but
when the receiver signal fails the blocking bias is
removed and 2V14 starts oscillating to supply one
of the heterodyne frequencies to mixer 2V10. This
frequency in combination with the 40 mc oscillator
output (110 mc ? 40 mc) provides the necessary 70
mc output to keep the transmitter radiating a quieted
microwave carrier. In addition relay 2K1 is operated.
b. At a terminal station the 110 mc output of
fault oscillator 2V14 is not required, so 2V14 is
, ?
changed to a dc amplifier by shorting out plate toil
2L47. If the incoming signal stops or the i-f ampli-
fier fails, amplifier 2V14 will cause 2K1 to operate.
Relay 2K1 Operation
1. Contact 2-3 opens. This breaks the 115 v ac
supply to the AFC motor in the transmitter, dis-
abling it for the duration of the fault. This is done
because, if the absence of an incoming signal is ,the
reason 21(1 is energized, amplified noise from the
i-f amplifier may produce a dc voltage at the dis-
criminator output which would cause the AFC motor
to run although no transmitter frequency correction
is necessary.
2. Contact 3-4 closes, operating relay 2K2.
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RM-4
Relay 2K2 Operation
1. Contact 2-4 opens. This breaks the B+ circuit
to limiters 2V7 and 2V8, keeping noise from being
fed to the discriminator 2V21 and mixer 2V10 at
a repeater station or to 2V2I only at a terminal sta-
tion. The noise voltage is thus prevented from
reaching the multiplex equipment and service units
and from being transmitted.
2. Contact 6-7 closes.
(a) At a non-standby station, contact 6-7 con-
nects the 115 V AC: through the closed contacts of
relay 2K3, to either the main equipment failure
relay or the loss of signal relay in the indicon coder
or decoder unit depending on whether relay 2K3 is
operated or not operated.
(b) At a standby station, contact 6-7 also con-
nects 110 V AC to the receiver fault switchover relay
of the standby switching unit (relay 9K8 of the
repeater switching unit or relay 10K7 of the terminal
switching unit) providing contact 2-3 of relay 2K3
is closed, initiating the radio equipment standby
switchover operation.
Relay 2K3 Operation?Standby Lockout Circuit
If the receiver I.E. amplifier fails, contact 2-3 of
2K3 is closed (2K3 released) by the action of the
standby -lockout circuit causing standby switchover
and transmission of a fault signal. The standby lock-
out circuit will not allow relay 2K3 to release on
failure of the incoming signal only. Contacts 2-3 of
relay 2K3 will remain open and standby switchover
will not occur.
? For complete description of the functioning of the
standby lockout circuit consult the Standby Switch-
over Instructions.
Tube Check
When the TUBE CHECK pushbutton 2S1 is
pressed a 75 ohm resistor is connected in series with
the primary of filament transformer 2T1. This re-
duces the filament voltage of the tubes by approxi-
mately 25%. By checking the meter reading at the
various circuit test points and by other test checks
the marginal tubes will be revealed.
CONTROLS
a. The Cavity Tuning control (2ZI) is used to
tune the mixer cavity to the frequency of the incom-
ing signal from the antenna.
b. The REL. OSC, control (2R46) adjusts the grid
bias of the dc amplifier section of 2V14 thereby
controlling the condition under which the 110 mc
oscillator will commence operation and 2KI will
operate.
c. The DISC pin jack (2J5) is used to connect
test meter IMI to the output of the discriminator to
determine if the i-f frequency is centered at 30 mc.
d. The SIG. pin jack (2J4) is used to conned
the test meter IM1 to measure the signal voltage of
the i-f section when tuning the receiver.
e. The CUR. (2314) pin Jack is used to connect
the test meter IM1 when tuning the 40 mc f-m osc.
of the modulator section.
f. The FREQ. (2J7) pin jack is used to connect
the distortion and modulation test unit to the modu-
lator while aligning the receiver.
g. The XTAL. CUR pin jack (2J3) is used to
connect, the test meter IM1 when adjusting 2J2 of
the mixer cavity for proper crystal excitation.
h. The 110 MC INPUT (2J8) coaxial terminal
is used to connect the 110 mc output of the terminal
AFC unit to the receiver r-f n'sixer grid. It is usfed
only at terminal stations.
I. The 70 MC OUTPUT coaxial terminal (2J9)
is used to connect the 70 mc output of the modu-
lator section to the transmitter 70 mc input.
j. The LOCAL OSC coaxial terminal (2J2) is the
input terminal for connecting a portion of the out-
put of the transmitter local oscillator to the mixer
cavity.
k. The Receiver Baseband Gain control 2R107 is
a screw driver adjusting potentiometer for regulat-
ing the signal voltage level from amplifier stage
2V15 to the baseband unit and to the signal chan-
nel amplifier stage '2VI6. This control, located in
the rear of the unit, is adjusted and sealed at the
factory.
I. The Modulator Gain control 2R109 is a screw-
driver adjusting potentiometer for controlling the
amount of signal voltage from the baseband unit
applied to the 40 mc modulator stage 2V12. This
control, located in the rear of the unit, is adjusted
and sealed at the factory and normally requires no
adjustment in the field.
m. The NOISE GAIN potentiometer 2R1I5 is
a control for regulating the amount of noise signal
to amplifier 2V17 (6-7-8).
n. The "OPR CUR" jack 2J15 is for monitoring
the operating current of the dc amplifier 2VI8
(6-7-8) when adjusting the noise gain control.
o. The TUBE CHECK pushbuttons 2S1 is used to
reduce the filament voltage of the tubes for the
purpose of checking their operating condition.
p. The SERV CHAN GAIN control 21(140 is
used to adjust the input to the service channel
amplifier 2V16.
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General Notes
MAINTENANCE
When replacing Crystal 2CR1, caution must be
exercised to .prevent damaging the crystal by static
discharge. To prevent this, one hand should be
grounded to the chassis before the crystal is allowed
to touch any part of the equipment. A soldering iron
should never be used on circuits connected to the
2CRI crystal without unplugging the iron for the
period of use. AC leakage current may otherwise
burn out the crystal. The 2CRI crystal current should
never be allowed to exceed a meter reading at 2J3
of 200 pia.
If a tuning coil in the 30 mc i-f or 70 mc i-f
circuits should open or become damaged, install a
replacement coil with its core turned in the same
amount as in the faulty coil. When thus repaired
these circuits will be adequately well aligned.
Tuning coils of the frequency modulator stages
2V12 or 2V13 and discriminator stage 2V21 carnet
be replaced without alignment of those circuitsi.
The plug-in electrolytic capacitor 2C71- should
be replaced after being in use continuously for one
year.
The schematic of figure RM-8 shows the dc voltage
values at all pertinent circuit check points. Certain
of these points contain double voltage readings.
Wherever these readings occur, except for standby
lockout circuit 2V18, the value above the line is the
voltage with no signal at the receiver input and the
value below the line is present with a saturating sig-
nal. For 2V18 the upper value is for little or no
signal and the lower value is with tube 2V1 removed.
CIRCUIT ALIGNMENT
The following instructions describe the process
for complete realignment of a receiver/modulator
unit. It is strongly cautioned that before sua a
realignment be attempted full familiarity with the
unit be obtained and all of the recommended test
'equipment listed in the test equipment tables of the
system instructions be assembled.
The test items specified in the following align-
ment procedures refer to the test equipment items
listed in the test equipment tables of the system
instructions.
The majority of tubes in the receiver/modulator
can be checked while the unit is in operation by
use of TUBE CHECK pushbutton al. With the
unit operating normally connect SIG jack 2)4 to test
meter IND. and note the current reading. If this
reading drops more than 50% when 2S1 is depressed
there is a near-failure tube probable in one of the
first five 30 mc i-f sockets (2V1 thru 2V5). If the
current read at the 40 mc OSC CUR jack drops more
than 20% with 2S1 depressed it is probable that
either 2V12 or 2V13 are near failure. If this check
is satisfactory, a check of 2V10 and 2V11 is possible
by observing the rf monitor meter 1M2 reading. If
its reading drops more than 60% a near-failure tube
is probable in sockets 2V10 or 2V11. A check of 2V6
thru 2V9 and 2V15 is possible by monitoring a re-
ceived multiplex signal. If the level of this signal
varies more than +2 db a probable near-failure tube
exists in one of these sockets.
Regarding changing tubes in the receiver/modulator
it should be cautioned that certain tubes should be
replaced only if absolutely necesary. 2V8 (2nd Lim.),
2V19 (Driver), 2V20 (Driver), 2V21 (Discr.), 2V12
(Mod.), and 2V13 (Osc.) have effects upon the
modulation and demodulation linearity of the system.
As a consequence these should not be changed unless
complete tube failure makes it necessary.
The changing of these tubes may affect the lin-
earity of these stages. Do not attempt a linearity
realignment unless the cross talk between channels
is noticed to increase intolerably.- See the CIRCUIT
ALIGNMENT section following, if linearity align-
ment is required. -
If either 2V12 or 2V13 are changed, the frequency
of the 2V13 oscillator should be adjusted to 40 mc
by varying 2L57 "40 MC OSC" only. When measur-
ing the frequency of the 40 mc oscillator there must
be no modulation on it. To make sure there is no
hum input pull out the baseband plug feeding the
receiver/modulator during the measurement. If 2V14
is changed the frequency and operating point of the
110 mc oscillator will need to be reset.
The information required for checking and ad-
justing the frequency of the 40 mc and 110 mc
oscillators will be found in the INITIAL ADJUST-
MENT procedure of the system instructions and the
CIRCUIT A.LIGNMENT section following.
RM-5
Limiter Alignment
a. Remove 2CRI. Attach the sweep generator out-
put to the junction of 2C42 and 2C45; attach the
scope lead to the junction of 2L75 and 2C58; attach
test equipment item 27 (a) between ground and
2C139. Set the sweep generator output low enough
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RM-6
so that the stage has not started to limit and the.
scope response is sharp. Peak 2L35 at 30.0 mc.
NOTE: In this and other applications, use a
10 microhenry r-f choke with leads approxi-
mately one inch long (test item 27(d)) in series
with the scope lead.
b. Turn 2C164 all the way in, and 2C165 all the
way out. Repeat (a), peaking 21,64 and 21.65 with
the sweep generator attached to the same place and
the scope attached to 2V19-5 (or 2V20-5).'
c. Repeat (a), peaking 21.31 with the sweep gen-
erator attached to the high side of 2L27 and the
scope attached to 2V7-6. Remove test equipment
item 27 (a).
30 MC I-F Alignment
a. Remove the rubber base cement used to pre-
vent the cores of the i-f transformers from moving.
Use a sharp instrument to loosen the edge of the
seal and then peel off the cement.
b. Apply the output of the 30 mc sweep generator
to the bottom end of 2L22, ground pin 1 of 2V4
to the center pin of the socket with a test prod, and
attach the scope to the junction of 2C37 and 2R21.
Adjust the output of the sweep generator for ap-
proximately +0.2. v dc at 2R21 with the "sweep"
knob in the "narrow" position. Turn on the sweep
generator markers at 25.6 mc and 34.4 mc. With
the "sweep" knob in the "wide" position, align the
stage for symmetrical response, (stages will vary
from critical coupled to somewhat less than critical
coupled) and for band-width such that the two
markers fall on the 50% response point. It will be
found that 2L25 and 2L27 act much the same as the
primary and secondary respectively of a double-tuned
circuit. 2126 controls the primary-to-secondary cou-
pling and consequently the stage bandwidth.
NOTE: Solder a 100 K ohm isolation resistor
in series with the Voltohmyst test probe.
c. Connect the sweep generator to 2L17, ground
2V3-1, connect test equipment item 27(c) (see Figure
RM-3) to the bottom end of 2C27, and attach the
scope to the alignment jig. With the scope gain on
maximum, adjust the sweep generator output for the
minimum value providing an adequate picture. Align
2L20, 21 and 22 as above except place the 25.6 mc
marker at the 60% response point and the 34.4 mc
marker at the 40% response point as shown in figure
RM-2.
This is done so that when the slight capacity
added by the alignment jig is removed, the stage
will be properly centered around 30 mc.
Figure RM-2---30 mc IF Response Curve
d. Apply the sweep generator to 21.12, ground
2V2-1, attach .the alignment jig to the bottom of
2C2I, and apply capacitor test equipment item
27(e), to 2V5-5 so as to ground this point to r-f
only. Align 2L15, 16 and 17 as in (c).
e. Align 2L10, ii and 12 as in (d) by moving
all test equipment items forward one stage.
f. Attach the 680-ohm - 47 ohm resistor corn- ?
bination, test equipment item 27 (b) (see Figure
RM-5), between the screw directly above 21.3 and
the standoff insulator connection to 21.1.
Align 21.5, 6 and 7 as in (d) by moving all test
equipment items forward one stage except apply
sweep generator through a 1500 mmf ceramic
capacitor to 2V1-1.
g. Attach the sweep generator to the high side
of the 47 ohm resistor, the scope to the junction of
2L3 and 2R86 and r-f ground 2V2-5. Align 2L1, 2
and 3 for a flat-topped response regardless of the
stage bandwidth unless this bandwidth is less than
8.8 mc. In this latter case align for 8.8 mc bandwidth.
Since the alignment jig is not used in this case
the stage is to be aligned symmetrically about 30
mc as in (b) with the two markers at the same
percentage response.
Remove test equipment item 27(b).
h. To insure that the limiter interstages are acting
as limiters, connect the sweep generator to 2L22, the
scope to the junction of 2C153 and 2R155, and test
equipment item 27 (a) to 2C139. Starting with a low
enough sweep generator output so that the picture
viewed is a sharply peaked response, increase the
output and observe that the response broadens out
and reaches a limiting value. Repeat with the scope;
on 2V8-6 and 2V7-,6.
NOTES: I. To minimize spurious interstage
coupling, the ground return connection of the
- sweep generator should always be kept to the
left of the point at which the sweep generator
is being applied (as viewed from the rear of
the chassis).
2. The sweep generator output cable is to be
terminated in 68 ohms at the cable end. The
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RM-7
ASSE move
SPRING DETAIL
PARTS LIST
PART
DESCRIPTION
3
100 MMF i 20% FEED THROUGH
CERAMIC CAPACITOR soov
4
S6 K11 410% I/i WATT
ALLEN PRAMS? R11616TOR
5
OK 105 GERMANIUM DIODE
(RAYTHEON)
6
0.69 MAIF t 10% CAPACITOR
(5TACKPOLE )
A HOLE
.229 DIA.
HOLE
.041 DIA.
TEMPER AFTER FORMING
PART .0159
QUARTER HARD BERYLLIUM
COPPER
PART 2, .064 HARD COPPER
HARDEN PART 1 TO SPRING
SOFT SOLDER PART 2 TO PART I.
-149 TOL ? 0
Figure RM-3-30
leads from the end of the cable to the point of
use should be kept as short as possible?cer-
tainly under 2".
3. To obtain an i-f response centered around
30 mc, it may be necessary to slightly favor
either band edge marker at the expense of the
other. Depending upon how well the results
of test (b) (I-F Response Check) indicate i-f
symmetry, a touch method for tuning the i-f's
a bit high or low may need to be used.
R-F Test and I-F Gain Check
Insert 2CR1.
CAUTION: Ground the body to the receiver
chassis before inserting the crystal to prevent
static discharge from damaging the crystal.
a. Apply the transmitter local oscillator frequency
to 2J2. Adjust the position of 2J2 for 2J31 = 50 ?a.
With no input signal to the i-f or r-f note the value
of 2J4E due to amplified noise. If this reading is
below 0.1 volt, the i-f has insufficient gain and the
quality of the i-f tubes should be investigated. The
0.1 volt reading is equivalent to a reading of 5 la
using the 200 pA test meter.
b. Maintaining the local oscillator feed at 2J31 =
50 p.a attach test equipment item 16, the r-f signal
generator. Note the reading of 2J4E on noise with
mc IF Alignment Jig
the signal generator off. Turn on the signal generator
and adjust its frequency to that normally received.
Fine tuning is accomplished by tuning for zero dis-
criminator current (2J5). Increase the 2J4E reading
by the noise figure factor listed below (depending
upon the original noise reading).
0
214E on Noise
.05 v to 0.1 v
0.1 v to 0.4 v
0.4 v to 0.8 v
Noise Figure Factor
1.6x
1.5 x
1.4x
Note the signal generator reading in microvolts.
It should be equal to or less than 2.7 kor. This figure
corresponds to a noise figure of 8.0 db.
NOTE: For all of these tests a short, low loss
r-f cable must be used to connect the r-f test
equipment to the receiver.
I-F Response Check
a. Calibrate the discriminator (with the i-f cover
on) by applying high level, saturating signals to the
i-f at 28, 30 and 32 mc, recording the discriminator
voltage for these frequencies.
Connect the r-f signal generator to 2J1 and apply
a signal at the frequency of the assigned received
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RM-8
CHASSIS
ASSEMBLY
SCHEMATIC
GE
4
.084 ALUMINUM
A
.120 DIA.
5 HOLES
8
TAP 4-40
? HOLES
0
3/8 OIL
I HOLE
NOTE . BEFORE USING IN A TEST CIRCUIT,
THIS UNIT MUST BE ALIGNED
USING A SWEEP GENERATOR AND
A WELL ALIGNED RECEIVER / MOD-
ULATOR.
PARTS LIST
PART
DESCRIPTION
CI
12 MMF 33% 0.P.
62
270 RIPAF *10% 031
CR
I N 34
J
BNO JACK
LI
3 TURNS NES ON IF TYPE FORM
L 2
6 TURNS IN 28 ON IF TYPE FORM
RI
2.7 K ? 5% ('2W ALLEN BRADLEY
R2
47K *5% 112W ALLEN BRADLEY
?
Figure RM-4-70 mc Dummy Load
signal. Adjust its exact frequency so that the i-f
frequency is 30.0 (0 current at 2J5 mc and adjust
the level for 2J4 = 1.0 v. Adjust the slug of 2Z1
for a peak reading. Vary the signal generator fre-
quency (keeping its output constant) and note 2J4E
for i-f signals of 28.0 mc and 32.0 mc. The i-f re-
sponse in db, defined as
E(28 mc or 32 mc)
20 log"
E(30 mc)
should not vary from the 30 mc value by more than
-?-1.5 db.
NOTE: In this case and others when a sat-
urating 30 mc i-f signal is desired, the maxi-
mum output of the i-f signal generator will
suffice. It should be fed into the i-f strip through
the hole in the cover just above the hole for
the tuning slug of 2L2.
70 mc I-F Alignrnent
a. Connect the "70 MC OUTPUT" of the re-
ceiver/modulator to the 70 mc jack of test equipment
item 27(f) (see Figure RM-4) using the 70 mc
coaxial cable that is normally connected to the Trans-
mitter "70 MC INPUT." (No other cable should
be used.) Attach the scope to the "d-c" pin of test
item 27(f) (70 mc dummy load) and the sweep
generator, with 70 mc sweep at full output, to
2V11-1. Align the output network, by tuning 2L55
and 2L56 so that the response is symmetrical and
the 64 mc and 76 mc pips fall at the 70% response
point.
b. Connect the sweep generator to the hot end
of 2L50. With the scope still on "d-c", reduce the
output of the sweep generator until the observed
scope picture height is roughly the same as it was
in (a). Connect the scope to 2V11-6. Align 2L52,
53 and 54 as above for symmetrical response and
for pips at the 70% response points.
Mixer Circuit Alignment
Using the megacycle meter (test equipment item
12) adjust the 40 mc oscillator (2V13) so that its
frequency is 40.0 mc. Make sure that 2J14I (as ,
measured with the 200 pta meter, test item 14) is
reading a reasonable value?between + 65 pa and
+80 p.a. Apply a. 30.0 mc saturating signal to the
30 mc i-f. Metering the voltage at the "d-c" terminal
of 70 mc dummy load, peak 2L49 and 2L50. This
must be done very carefully since the maxima are
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-$
Approved For Release 2000/08/29: CIA-RDP79T01049A002600030002-8
quite broad. The rectifier dummy load dc voltage
should be 1.5 volts or greater. Wire "L" must be
connected for this test.
Fault Oscillator/Relay Adjustment
a. Turn 21146 maximuni clockwise w insure strong
oscillation of 2V14. Using the megacycle meter (test
item 12) set the oscillator frequency to 110 mc. The
rectified dummy load dc voltage should be 1.5 volts
or greater.
b. To adjust the REL/OSC CONTROL 2R46
connect the r-f signal generator (test item 16) to
2J1. With the signal generator at zero output, plug
the 1M1 meter lead into the SIG jack and note the
noise reading on the test meter. Turn up the signal
generator output until a reading of 20 1.La plus the
noise reading is obtained. Then turn the REL/OSC
CONTROL fully clockwise and then carefully
counter-clockwise, stopping when the relay clicks.
The relay should now operate and the 110 mc oscil-
lator become operative and inoperative as the signal
is removed and reapplied.
Discriminator Alignment
a. Remote wire "L". Turn controls 2R107 and
2R109 on the receiver/modulator unit to maximum.
"Adjust the frequency of the signal generator, test
equipment item 16 by the T.V. calibrator, test equip-
ment item 5 for 30 mc. Insert the 30 mc probe near
the grid of the first i-f stage and adjust 2R151 for
zero discriminator d-c output (2J5). Remove the
probe.
Attach the distortion and modulation test unit,
test equipment item 11 to the receiver modulator,
putting only the 30 mc probe and the 40 mc probe
in place. Wiith the "40 mc Var" oscillator and the
40 mc Xtal" oscillator on, locate the beat between
the two with the "40 mc Var" control. With the
"40 mc Xtali" oscillator off, adjust the 35 mc oscil-
lator of the test set for zero discriminator d-c output
(2J5). Turn the "40 mc Var" oscillator off, and
adjust 2L57 for zero discriminator d-c output".
NOTE: For all of this test the covers for both
the 30 mic i-f and the oscillator-mixer section
must be kept on.
b. Plug in the baseband connection.
Each distortion and modulation test unit is fac-
tory adjusted so that its meter (M1) will read 100
for ?-750 kc deviation when the meter is on the
"35 mc Osc" position at which time it reads the
tone level being supplied to the 35 mc modulator/
oscillator. For an average modulator section (in the
receiver/modulator unit) a reading of 30 will result
in a +750 kc deviation, with the meter switch on
the "Rec-Mod" position.
RM-9
Put the operation switch in the "Discr" position.
With meter on "35 mc Osc." adjust Osc. B on
50 kc for a reading of 100. With the meter on "Rec.
Mod." adjust Osc. A on 70 kc for a reading of 30.
With the meter on 0 db and Osc. B changed to 30
kc, adjust "30 kc Gain" for full scale (0 db) reading.
With Osc. A on the 70 kc and 80 kc positions, and
Osc. B on 50 kc read the intermodulation products
at 30 kc' with the meter. In the 70 kc and 80 kc
positions the unit is measuring the products due to
third and second order intermodulation respectively.
Adjust the discriminator so that both 70 kc and 80 k
products are minimum. It should be possible to align
the units so these products are below ?43 db, how-
ever a value of ?40 db will provide satisfactory
service.
In aligning the discriminator it will be found
that 2L71 and 2C165 primarily adjust the high fre-
quency peak and 2L70 and 2C164 primarily adjust
the low frequency peak. The 70 kc product is de-
termined by the separation of these two peaks and
the 80 kc product is determined primarily by the
2R151 setting.
In tuning the discriminator the condition shall be
maintained that: the discriminator d-c output (213)
for a saturating CW signal of 30.0 mc must be zero
volts +0.01 v.
c. Test the discriminator linearity at half devia-
tion using essentially the same procedure as above,
except use readings of 1/2 the above for the oscillator
levels. (Readjust the "30 kc Gain" for full scale
reading in this revised condition.) It should be pos-
sible to align the units so that in this case the prod-
ucts will be below ?51 db, however, a value of
?45 db will provide satisfactory service.
Modulator Alignment
a. Continuing with the test unit, change to the
"overall" test position. With the meter on "Rec
Mod", "Osc. A" off and "Osc. B" on 50 kc adjust
the output of "Osc. B" to 60. With "Osc. B" Off
and "Osc. A" on 70 kc adjust its output to 60. With
both oscillators on and Osc. B on 30 kc, adjust
Figure RM-5-30 mc Alignment Resistor Network
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
RM-10
Figure RM-6?Receiver/Modulotor?Reor View. Dust Cover and Shield Covers Removed
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
"30 kc Gain" for full scale on meter "0 db". With
"Osc. A" on 80 kc, tune 2L58 for minimum meter
reading. Check the meter reading with oscillator A
on 70 kc. It should be possible to align the units so
that these products are below -43 db, however a
value of -40 db will provide satisfactory service.
b. Test the overall operation at half deviation
using essentially the same procedure as above except
using a meter reading of 30. (Readjust "30 kc Gain"
for full scale.) It should be possible to align the
units so that in this case the products will be below
-51 db, however a value of -45 db will provide
satisfactory service.
RM-11
NOTES: 1. Since an average reading of 30 is
used for the receiver 40 mc modulator, occasion-
ally difficulty may arise due to over-deviating an
unusually sensitive modulator. If there is doubt,
calibrate the individual modulator as is generally
described in (c) below.
2. In all discriminator and modulator alignment
tests the 200 p,a test meter must not be connected
to 2J5.
c. Connect the electronic voltmeter test equipment
item 3 between 2312-2 and ground on the receive/
modulator. Using the test unit "40 mc Var" oscillator
as a deviation meter, set the test switch to the OVER-
TYPICAL RECEIVER/MODULATOR VOLTAGE AND METER READINGS
The following are approximate voltages existing between individual tube pins and ground as measured
with the Voltohmyst with a 100k resistor in series with the probe. In the case of signal-dependent voltages
the left-hand value is for no signkl and the right-hand value for high signal. All voltages are dc unless
otherwise noted.
Tube
Type
Function
Pin
#1
Pin
#2
Pin
#3
Pin
#4
Pin
#5
Pin
#6
Pin
#7
Pin
#8
Pin
#9
2V1
6CB6
I.F.
-.20
0
6.1 ac
0
60
60
0
-
-
2V2
6CB6
I.F.
0
1.0
6.1 ac
0
80
80
0
-
-
2V3
6CB6
I.F.
0
1.0
6.1 ac
0
80
80
0
-
-
2V4
6CB6
LE
0
1.0
6.2 ac
0
80
80
0
-
-
2V5
6CB6
I.F.
0,-1.6
1.2,1.3
6.2 ac
0
80,70
80,70
0
-
-
,
2V6
6CB6
I.F.
0,-2.0
1.2,1.3
6.2 ac
0
80,65
80,65
0
-
--
2V7
6CB6
I.F.
0
3.0
6.3 ac
0
100
100
0
-
-
2V8
6CB6
I.F.
0
2.5
6.3 ac
0
100
107
0
-
_..,..
2V9
0A2
Voltage Reg.
145
0
0
0
145
0
0
-
2V9
6AL5
Disc.
0
-3.4
0
6.3 ac
var.
0
-3.4
--
-
2V10
6AS6
Mixer
-1.8,-.03
.85,.55
6.3 ac
0
33,64
33,64
0
-
-
2V11
6CB6
Amp.
0
1.4
6.3 ac
0
100
100
1.4
-
-
2V12
6AH6
Mod.
3.5
7.0
6.3 ac
0
160
135
7.0
-
-
2V13
12AT7
Osc.
160
2.7
4.4
0
0
160
+2.7
4.4
6.3 ac
2V14
12AT7
Osc/Relay
26,12
0.1,2.7
2.5
0
0
215,250
26,12
32,24
6.3 ac
2V15
6CB6
B.B.Amp.
78.0
80.0
6.3 ac
0
250
195
80
-
-
2V16
12AN7
S.Ch.Amp.
75
0
1.5
0
0
165
0
1.8
6.3 ac
2V17
12AX7
Lockout Amp.
125
0
1.5
0
0
125
0
1.5
6.3 ac
2V18
12AT7
Lockout Amp.
90
-3.0,0
2.0
0
0
200,250
33,0
35,15
6.3 ac
2V19
6AH6
Driver
13
16
6.3 ac
0
235
150
16
-
-
2V20
6A136
Driver
13
16
6.3 ac
0
235
150
16
-
-.
2V21
GALS
Discriminator
Var + 3
Var -3
0
6.3 ac
0
0
0
-
-
Voltages are positive unless noted. Var.-variable with received frequency.
The following are typical readings obtained using the 200 microamperes test meter (IMI) in the trans
mitter unit.
,...-
Xtal Cur.
(233):
,
-50pa
Sig.
(2J4):
+5 via no signal; + 140 pa high signal
Disc.
(235):
zero for 30.0 mc I. F. signal; up to -?-150 ?La for off freq. signal. A typical value
is ?-30 p,a for carrier frequencies different from 30 mc by -+ 1 mc.
Grid. Cur.
(2314):
+70 pa
Lookout Cur.
(2J15):
110 ?a with no signal or low signal
55 p,a with 2V1 removed from the socket.
Approved For Release 2000/08/29: CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29 : CIA-RDP79T01-049A0-02600030002-8
RM-12
ALL position, turn Osc A off, Osc B on 30 kc and
adjust the 30 kc level until the peak deviation is
exactly +750 kc. Measure the required modulator
input. Limits 0.24 v to 0.37 v rms. Note the test unit
meter current reading and use this value in place of
the average value of 30.
Baseband Amplifier Check
a. Maintaining the conditions above, meter the
30 kc voltage on 2J12-5. Limits 0.5 v to 1.0 v.
NOTE: The components affecting this out-
put include 2V8, 2V19, 2V20 and 2V21. If it
is necessary to change any of these tubes in
order to pass the above test, (b) and (c) of
Discriminator Alignment must be redone. As
an aid to isolating low baseband output dif-
ficulties, it may be desirable to note the dis-
criminator deviation sensitivity. This has been
found to average around 0.4 v rms for a peak
deviation of +0.75 mc. This voltage is meas-
ured at 2C61 with the electronic voltmeter.
A 10 microhenry choke must be used in series
with the hot lead of the electronic voltmeter.
Baseband Gain Control and Modulator Gain
Control Adjustments
a. Maintain the distortion and modulation test
unit set up as above, except remove the lead feed-
ing the baseband output (2312-5) to the test unit.
Place a 2,200 ohm resistor between 2J12-5 and
ground to properly terminate the baseband output.
b. Using the distortion and modulation test unit
35 mc modulated oscillator or some other source of
standard deviation, calibrate the discriminator de-
termining what ac voltage it delivers when the i-f
signal is deviated 41.5 mc.
c. Apply a 5 kc tone at a level of 0.95 volts to
2312-2. Adjust the modulator gain control 2R109
until the discriminator voltage is the value meas-
ured in (b) above.
d. Measure the voltage between 2312-5 and
ground and adjust the baseband gain control 2R107
for 0.38 volts output.
Service Channel Amplifier Check
Disconnect wires and connect wire Q to 2J12-5.
Apply a voltage at 1 kc from test equipment item
2 to 2312-2 at a level of 0.0475 v rms. This will
deviate the oscillator by +75 kc. The service
channel output from 2J12-5 into 100k ohms should
then be greater than .61 volts with 2R140 at its
maximum clockwise position. Adjust 2R140 for
a .61 volt output. Remove the resistors placed be-
tween 2J12-5 and ground. If receiver/modulator
is to be used at a drop repeater or terminal station,
remove wire Q and reconnect wire S. If receiver
modulator is used at a thru repeater station, leave
connected as above.
For additional information on the use of the
Distortion and Modulation Test Unit MI-31023-A
(test item 11) consult the instructions supplied
with the unit.
If the receiver/modulator unit is to be used in
a terminal station remove wire "L". Retain this
connection if the unit is to be used in a repeater
station. Apply core sealing material to the tops
of all tuning coils except 2L47 and 2L57. Also seal
2R107 and 2R109.
Standby Lockout Circuit
The standby lockout circuit is used only at
standby stations. The adjustment of this circuit is
described in the Standby Switchover Instruction
Book.
NARROW BAND RECEIVER/MODULATORS MI-25969?I and Ml-31 1711._I
These Receiver/Modulators are used in sys-
tems employing a modulation frequency of 300
C.P.S. to 160 KC. They differ from MI-25969
and MI-31174 in two respects. The baseband
amplifier stage 2V15, and the modulator gain
control circuit are connected as shown in the
lower right-hand corner of Figure RM-7, and
the upper right-hand corner of Figure RM-8.
The adjustment, test and performance"of.
Receiver/Modulators MI-25969-1 and MI-31174-1
is the same as for MI-25969 and MI-31174, ex-
cept for the baseband frequency range of 300
C.P.S. to 160 KC, and the socket voltages of
stage 2V15, given below.
Tube
Type
Function
Pins
----i
1
2
2
11
I 5
'
I
7
I
8
I
9
2V15 ..6018?Baseband
Amplifier
3.2
4.1
6.3 ac
0
1
1 210
t
65
i
i
4.1
1
!
I
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8 ?
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
RM-13
LIST OF REPLACEMENT PARTS
WIDE BAND. RECEIVERS MI-25969 AND MI-31174 (Dwg.349736-500
Symbol No.
Stock No.
Drawing No.
Description
CAPACITOR
2C1
Part of 241
2C2
73748
449696-3
Ceramic. 1500 ??f. +100%, 0%. SOO v ?
2C3
94189
964002-121
Mica. 1.000 ??f. 110%. 500 v
2C4
102015
735717-33
Ceramic. 220 ??f. *10%. 500 v
2C5
Not Used
2C6.2C7
73748
449696-3
Ceramic. 1500 ?AL +100%. -0%. 500 v
2C8
Not Used
2C9
102015
737717-33
Ceramic. 220 ??f. *10%. 500 v
2C10
93602
735717-427
Ceramic. 68 ??f. t.10%. 500 v
2C11.2C12
Not Used
2C13
73748
449696-3
Ceramic. 1500 ?of. +100%. -0%. 500 v
2C14
Not Used
2C15
102015
735717-33
Ceramic. 220 ??f. *10%. 500 v
2C16
93602
735717-427
Ceramic. 68 ??f. *10%. 500 v
2C17
Not Used
2C18
73748
449696-3
Ceramic. 1500 ??f. +100%. -0%. 500 ?
2C19.2C20
Not Used
2C21
102015
735717-33
Ceramic. 220 if. A10%. 500 v
2C22
93602
735717.427
Ceramic. 68 ??f. t10%. 500 v
2C23
Not Used
2C24
73748
449696-3
Ceramic. 1500 ??f. +100%. -0%. 500 v
2C25.2C26
Not Used
2C27
102015
735717-33
Ceramic. 220 ??f. *10%. 500 v
2C28
93602
735717-427
Ceramic. 68 pod. t10%, 500 v
2C29,2C30
Not Used
--2C31
73748
449696-3
Ceramic. 1500 ??f. +100%. -0%. 500 v
2C32
Not Used .
2C33
102015
735717-33
Ceramic. 220 ??f. t10%. 500 v
2C34
93602
735717-427
Ceramic. 68 ??f. 310%. SOO v
2C35
73748
449696-3
Ceramic. 1500 ??f. +100%. -0%. 500 v
2C36
204866
8864187-2
Ceramic. 1500 if. ,t20%. SOO v
2C37
94222
984002-181
Mica, button, silver mica. 220 ?01 t10%, 500 v
2C38
Not Used
2C39
73748
449696-3
Ceramic. 1500 ?Ad. +100%. 0%. SOO v
2C40.2C41
Not Used
2C42
102015
735717-33
Ceramic. 220 ??f. ?10%. 500 v
2C43
105776
735717 -37
Ceramic, 470 ??1. t10%. 500 v
2C44
Not Used .
2C45
93602
735717-427
Ceramic, 66 if. ?10%. 500 v
2C46
73748
449696-3
Ceramic. 1500 ??f. +100%. -0%. 500 v
2C47.2C48 .
Not Used .
2C49
102015
735717-33
Ceramic. 220 ??f. t10%. 500 v
2C50
105289
99327-6
Headed lead. 4.7 ??f. ?20%. 500 v
2C51 ?
2C52
105776
735717-37
Ceramic, 470 ?pd. ?10%. 500 v .
Not Used
2C53
93602
735717-427
Ceramic. 68 ??f. t10%. 500 v
2C54
94189
984002-121
Mica. 1000 ??f. A10%. 500 v .
2C55
73748
449696-3
Ceramic. 1500 ??f. +100%. -0%. 500 v 1
2C56.2C57
Not used
2C58
101940
735717-21
Ceramic. 22 ??f. t10%. 500 v
2C59.2C60
94189
984002-121
Mica. 1000 ??f. t10%. 500 Ar
2C61
Not Used
2C62
735715-163
Paper. 0.01 ?I.- t10%. 400 v
2C63 to 2C65
102015
735717-33
Ceramic. 220 ??1. t10%. 500 v
2C66
204866
8864187-2
Ceramic. 1500 Auf. ?20%. SOO v
2C67
Not Used
2C68
735715-171
Paper,' .047 if t10%, 400 v
2C69
1215671-3
Paper. 1.0 ?C?10%, 400 v (Cornell Dubilier KP4W1)
78276
735717-431
Ceramic. 150 ??f. ?10,4. 500 v
2C71-A,B,C
96566
449618-1
Electrolytic, 10/10/10 I. 400 v
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8 .
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
11M-14
Symbol No.
Stock No.
Drawing No.
Description
2C72
Not Used
2C73
93602
735717-427
Ceramic, 68 ppf. t10%, 500 v
2C74
75610
735717-443
Ceramic. 1500 ppf, t10%. 500 v
2C75
735715-175
Paper. 0.1 pf, 110%. 400 v
2C76
108943
6914319?340
Mica, 470 Aml, 15%. 300 v
2C77
217799
8972995-1
Porcelain. 6.8 AO. t5%. 500 v
2C78
102064
449696-1
Ceramic, 820 ppf, +100%. -0%. SOO v
2C79
735715-171
Paper, 0.047 pf, 310%. 400 v
2C80
215197
8914319-320
61gOti,,STS%!"50'0"
2C81
217803
8914319-324
v
2C82
71504
99327-11
Headed lead, 0.68 ppf, t10%, 500 v
2C83
Not Used
2C84
73748
449696-3
Ceramic. 1500 ppf. +100%, .-0%. 500 v
2C85
102084
449696-1
Ceramic. 820 ppf, +100%, -0%, 500 v
2C86
204866
8864187-2
Ceramic, 1500 ppf. t20%, 500 v
2C87
102084
449696-1
Ceramic, 820 pmf. +100%, -0%, 500 v
2C88
102015
735717-33
Ceramic. 220 ppf, t10%. 500 v
2C89
102084
449696-1
Ceramic, 820 ppf, +100%, -0%, 500 v
2C90
71500
99327-13
Headed lead, 1.5 if, t10%, 500 v
2C91
102084
449696-1
Ceramic, 820 Aid. +100%, -0%, 500 v
2C92
105776
735717-37
Ceramic, 470 AO. t10%. 500 v
2C93. 2C94
204866
8864187-2
Ceramic, 1500 ppf. ?20%. SOO v
2C95. 2C96
Not Used
2C97
p735715-169
Paper. 0.033 pf, *10%, 400 v
2C98
Not Used
2C99
93602
735717-427
Ceramic. 68 ppf, t10%, 500 v
2C100
75641
735717-436
Ceramic, 390 ppf. t10%, 500 v
2C101 to 2C103
73748
449696-3
Ceramic, 1500 gpf, +100%, -0%. 500
2C104
204866
8864187-2
Ceramic. 1500 ppf. t20%, 500 v
2C105i2C106I
73748
449696-3
Ceramic, 1500 ppf, +100%, -0%, 500 v
2C107
204866
8864187-2
Ceramic. 1500 ppf. t20%. 500 v
2C108. 2C109
73748
449696-3
Ceramic, 1500 pLf. 4100%, -0%. 500 v
2C110
77690
99327-12
Headed load, 1.0 Aka. ?10%, 500 v
2C111
Not Used
2C112,2C113
73748
449696-3
Ceramic. 1500 ppf, +100%. -0%, 500 v
2C114
735715-80
Paper. 0.27 pf. t10%, 200 v
2C115, 2C116
73960
449696-55
Ceramic, 10,000 Agf, +100%, -0%, 450 v
2C117
735715-175
Paper. 0.1 pf. t10%, 400 v
2C118
102015
735715-33
Ceramic, 220 ?pl., t10%, 500 v
2C119
73960
449696-55
Ceramic, 10,000 ppf. +100%. -0%. 450 v
2C120
735715-175
Paper, 0.1 pf. t10%, 400 v
2C121. 2C122
73960
449696-55
Ceramic, 10.000 ppf. +100%, -0%, 450 v
2C123
735715-175
Paper, 0.1 pf, t10%. 400 v
2C124
73960
449696-55
Ceramic. 10,000 ppf. +100%. -0%. 450 v
2C125
73 57 15-71
Paper, 1.0 pl. t20%. 100 v
2C126
Not Used
2C127
735715-171
Paper. 0.047 pf. ?10%. 400 v
2C128
102721
735717-439
Ceramic. 680 ppf. 310%. 500 v
2C129
73748
449696-3
Ceramic, 1500 ppf. +100%. -0%, 500
2C130
77625
990 167- 109
Ceramic, 220 ppf. t20%, 500 v
2C131
73748
449696-3
Ceramic, 1500 ppf. +100%, -0%. 500 v
2C132. 2C133
77252
449696-2
Ceramic, 1000 ppf, +100%. -20%. 500 v
2C134
73748
449696-3
Ceramic: 1500 ppf +100 -0%, 500 v
2C135. 2C136
77252
449690-2
Ceramic! 1000 ppf +100 -20%. SOO v
2C137
73748
449696-3
Ceramic, 1500 ppf. +100%, -0%. 500 v
2C138
77252
449696-2
Ceramic. 1000 ppf. +100%. -20%, 500 v
2C139
94189
984002-121
Mica, 1000 ppf. ?10%. 500 v
2C140 to 2C143
99177
8825449-1
Ceramic, 1000 ppf, t20%. 500 v
2C144, 2C145
105289
99327-6
Headed lead, 4.7 ppf. ?20%. 500 v
2C146
102230
990167-111
Ceramic, 470 ppf. t20%, 500 v
2C147
94189
984002-121
Mica, 1000 1f ?10%, 500 v
2C148
102230
990167-111
Ceramic. 470 ppf, t20%, 500 v
2C149. 2C150
77625
990167..109
Ceramic, 220 ppf..?20%. SOO v
Approved For Release 2000/08/29: CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
RM-15
Symbol No.
Stock No.
Drawing No.
Description ?
-4
2C151. 2C152
94189
984002-121
Mica. 1000 Apf, i10%. 500 v
2C153
77625
990167-109
Ceramic, 220 AO ?20%, 500 v
2C154
102234-A
990187-113
Ceramic, 1000 poi 120%, 500 v
2C155.2C156
73473
8811182-4
Ceramic, 4700 Agf t20%, 500 v .
2C157
102,234-A
990167-113
Ceramic, 1000 AO *20%, 500 v
2C158
77625
990167-109
Ceramic. 220- p.p.f ?20%. 500 v
2C159.2C160
94189
984002-121
Mica, 1000 pia t10%. 500 v
2C161 to 2C163
102234-4
990167-113
Ceramic. 1000 iii4f ?20,4. 500 v
2C164.2C165
217084
1040180-1
Variable air trimmer. 4.5-28 Agf
2C166.2C167
93602
735717-227
Ceramic. 68 AO ?20%. 500 v
2C168
94189
984002-121
Mica, 1000 ?Af ?10%. 500 v
2C169
102230
990167-111
Ceramic. 470 pLf ?20%, 500 v
2C170
(See note 6 on Schematic)
2C171
77625
990167-109
Ceramic, 220 Awf +100 -0%. 500 v
2C172
?
'
2CRI(MI-25969)
216735
?
Rectifter: crystal diode 1N21D
2CR1(MI-31174)
Rectifier: Crystal diode (Sylvania Type 1N23E)
2CR2 to 2C19
94229
.
Rectifier: Crystal diode 1N66
2E1,2E2
211486
339202-1
Terminal: feed-thru. 5/8" lg.
2E3.2E4
8834451-1
Terminal: stand-off 5/8" lg. overall
2E5 to 2E26
211646
8886187-1
Terminal: Stand-off. melamine. Body. 27/32" ig.
with #4-40 mtg. hole
2E27,2E28
8834451-1
Terminal: stand-off 5/8" lg. overall
2E29.2E30
211486
339202-1
Terminal: feed-thru 5/8" lg. .
2J1
95392
456961-501
Connector: female, coaxial. chassis mtg., including
0.511 lg. probe
2J2
94231
8834436-501
Coupling loop: comprising 1 each, female coaxial
chassis mtg. connector, sleeve and 33 ohm % w.
-__
resistor
233,to 235
93678
742565-1
Connector: pin jack .
2J6
Not Used
2J7
93678
142565-1
Connector: pin jack
2J8.2J9
94205
8845666-1
Connector: female, coaxial, chassis mtg.
2110
Not Used
2J11
28507
181494-3
Connector: male, 6 contact, chassis mtg.
2J12
16534
181494-4
Connector: female, 6 contact, chassis mtg.
2113
28507
181494-3
Connector: male. 6 contact, chassis mtg.
2114.2J15
93678
742565-1
Connector: pin jack
21(1
56316
6888583-1
Relay: 8000 ohm. contacts S.P.D.T.
2K2
95350-A
8708717-3
Relay: 115 v.. 50/60 cy., contacts D.P.D.T.
21,1
94233
629132-511
Coil: adj. core, 18 turns
2L2
94234
629132-506
Coil: adj. core. 32 turns
2L3
94235
629132-509
Coil: adj. core. 22 turns
ail
217800
941524-245
Reactor! RF choke, 6.8 microhenry 1600 MA
2L5
' 94236
629132-505
Coil: adj. core, 33 turns
2L6
94237
629132-503
Coil: adj. core. 40 turns
21,7
94238
629i32-510
Coil: adj. core, 19 turns
2L8
94040
8834424-501
Reactor: R.F. choke, 2.4 microhenry
2L9
Not Used
2L10
94236
629132-505
Coil: adj. core. 33 turns
2L11
94237
629132-503
Coil: adj. core, 40 turns 1
2L12
94238
629132-510
Coil: adj. core, 19 turns 1
2L13
94040
8834424-501
Reactor: R.F. choke. 2.4 microhenry
2L14
217800
941524-245
Reactor! R.F. choke, 6.8 microhenry 1600 MA
2L15
94236
629132-505
Coil: adj. core. 33 turns
2L16
94237
629132-503
Coil: adj. core. 40 turns
2L17
94238
629132-510
Coil: adj. core. 19 turns
2L18
94040
8834424-501
Reactor: R.F. choke. 2.4 microhenry
2L19
217800
941524-245
Reactor! R.F. choke. 6.8 microhenry 1600 MA
2L20
94236
629132-505
Coil: adj. core. 33 turns
2L21
94237
629132-503
Coil: adj. core. 40 turns
2L22
94238
629132-510
Coil: adj. core, 19 turns
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
RM-16
Symbol No.
Stock No.
Drawing No.
Description
21.23
94040
8834424-501
Reactor: R.F. choke. 2.4 microhenry
21.24
217800
941524-245
Reactor: R.F. choke. 6.8 microhenry 1600 MA
21.25
94236
629132...505
Coil: adj. core. 33 turns
21.26
94237
629132..503
Coil: 00. core, 40 turns
21.27
94238
629132-510
Coil: adj. core. 19 turns
2L28
94040
8834424-501
Reactor': R.F. choke. 2.4 microhenry
2L29.2L30
217800
941524-245
Reactor: R.F. choke. 6.8 microhenrY. 1600 MA
2L31
94210
629132-526
Coil: adj. core. 15 turns
2132
94040
8834424-501
Reactor: R.F. choke. 2.4 microhenry
2L33,2L34
217800
941524-245
Reactor: R.F. choke. 6.8 microhenry. 1600 MA
2L35
94239
629132-527
Coil: adj. core. 14 turns
21.36
94040
8834424-501
Reactor: R.F. choke, 2.4 microhenry
2L37 to 21.39
217800
941524-245
Reactor: R.F. choke. 6.8 microhenry. 1800 MA ,
21.40 to 21.43
Not Used
2L44 ,
94040
8834424-501
Reactor: R.F. choke. 2.4 microhenry
21.45
Not Used
21.46
217800
941524-245
Reactor: R.F. choke, 6.8 microhenry, 1600 MA
21.47
94211
629132-520
Coil: adj. core. 6 turns ,
21.48
Not Used
21.49,21.50
94241
629132-513
Coil: adj. core, 16 turns
21.51
217800
941524-245
Reactor: R.F. choke. 6.8 microhenry. 1600 MA
21.52
94244
629132-514
Coil: adj. core. 13 turns
2L53
94235
629132-509
Coil: adj. core. 22 turns
21.54
94245
629132-517
Coil: adj. core, 8 turns
21.55
94246
629132-516
Coil!' adj. core, 10 turns ,
21.56
94208
629132-524
Coil: adj. core, 4 turns
21.57
205051
629132-535
Coil: adj. core. 11 turns
21.58
94239
629132-527
Coil: adj. core, 14 turns
2L59
94040
8834424-501
Reactor: R.F. choke. 2.4 microhenry
21.60
217800
941524-245
Reactor: R.F. choke, 6.8 microhenry 1600 MA
2L61
57259
8834437-503
Reactor: R.F. choke. 7 microhenry. 1000 MA
21.62
95885
8834423-502
Reactor: R.F. Inductor
2L63
98387
8834423-503
Reactor: R.F. Inductor
2L64
217085
344067-508
Coil: R.F.
21.65
94209
629132-525
Coil: R.F.
21.66 to 2L69
217800
941524-245
Reactor: R.F. choke, 6.8 microhenry, 1600 MA
21.70
94239
629132-527
Coil: adj. core, 14 turns
21.71
205051
629132-535
Coil: adj. iron core, 11 turns
,
21.72
217800
941524-245
Reactor: R.F. choke. 6.8 microhenry. 1600 MA
21.73.21.74
94040
8834424-501
Reactor: R.F. choke. 2.4 microhenry
21.75
217800
941524-245
Reactor: R.F. choke. 6.8 microhenry. 1600 MA
21.76
217801
941524-251
Reactor: R.F. choke, 12 microhenry 1000 MA
?
208637
8832091-2
Core: Tuning, iron, threaded type with fiber
nut and spring washer, for (21.1.2.3,5.6.7.10.11.
12.15.16.17.20.21.22.25,26.27,31 and 35)
RESISTORS:
Fixed composition, unless otherwise specified
2R1
Not Used
2112
82283-175
4700 ohm i5%. % w
2113 to 2115
Not Used
2116
82283-44
33 ohm i10%. % w (Part of 2J2)
2117
Not Used
'
2118
82283-175
4700 ohm i5%, % w
2119.21110
Not Used
21111
82283-131
68 ohm i5%, % w
21112
Not Used
21113
82283-175
4700 ohm t596. % w .
21114,21115
Not Used
21116
82283-52
150 ohm i10%. % w
21117
Not Used ?
21118
82283-175
4700 ohm t5%, % w
Approved For Release 2000/08/29: CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
RM-17
Symbol No.
Stock No.
Drawing No.
Description
2R19,2R20
Not Used
2R21
82283-193
27,000 ohm t5%. % w
?
2R22
Not Used
2R23
82283-175
4700 ohm 15%. 4 w
2R24
Not Used
2R25
82283-58
470 ohm t10%. % w
2R26
82283-50
100 ohm t10%. % w
2R27
82283-62
1000 ohm t10%. % w
2R28
Not used
2R29.2R30
82283-57
390 ohm t10%, % w
.
2R31
82283-173
3900 ohm *5%. % w
2R32
90496-75
12,000 ohm t10%, 1 w
2R33,2R34
82283-57
390 ohm t10%, % w
2R35
82283-173
3900 ohm t5%, % w
2R36
90496-75
12.000 ohm 310%. 1 w
2R37 to 2R39
Not Used
2R40
82283-193
27.000 ohm t5%. % w
2R41
82283-94
470.000 ohm t10%. 4 w
2R42
59175
458572-90
wire wound. 22.000 ohm 15%. 5 w
2R43.2R44
82283-98
1.0 meg. t10%. % w
2R45
82283-95
560.000 ohm t10%. % w
2R46
94192
737829-31
Variable. comp. 25,000 ohm t10%.2 w
2R47
90496-66
2200 ohm t10%. 1 w
21148
82283-98
1.0 meg. t10%. % w
.
2649
82283-145
270 ohm t5%. % w
2R50
82283-74
10.000 ohm t10%. % w
21351.2R52
Not Used
2R53
82283-159
1000 ohm 35%. % w
-2R54
82283-215
220,000 ohm t5%, 4 w
2R55
82283-223
470,000 ohm t5%, 4 w
2R56
82283-217
270,000 ohm *5%. % w
2R57
8.2283-211
150,000 ohm ?5%, % w
2R58
82283-213
180.000 ohm t5%. % w
21159
82283-155
680 ohm t5%, % w
2R60
99126-77
18.000 ohm t10%, 2 w
2R61
Not Used
2R62
82283-207
100.000 ohm t5%. % w
21163
90496-207
100,000 ohm t5%, 1 w
2R64
Not Used
2R65
99126-199
47.000 ohm t5%. 2 w
2R66
Not Used
2R67
82283-191
22,000 ohm t5%. % w
2R68
82283-163
1500 ohm t5%, % w
2R69
82283-137
120 ohm t596. % w
21170
82283-159
1000 ohm t5%. % w
2R71
211398
458572-66
Wire wound. 4800 ohm t5%. 5 w
2R72
99126-81
39.000 ohm ?10%. 2 w
2R73
62283-175
4700 ohm t5%. % w
2R74
82283-169
2700 ohm 35%, % w
2R75
82283-143
220 ohm t5%. % w
2R76
99126-713
22,000 ohm t10%. 2 w
2R77
82283-177
5600 ohm t5%. % w
!
2R78 to 2R81
Not Used ,
21182
82283-169
2700 ohm t5%. % r
2183
82283-215
220.000 ohm ?5%?% w
21184
Not Used
21185
99126-77
18.000 ohm t10%. 2 w
2R86
82283-86
100.000 ohm t10%. % w
2R87
90496-74
10.000 ohm t10%, 1 w
2R88
82283-167
2200 ohm ?5%, 14 w
2R89
82283-52
150 ohm t10%. % w
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
pilved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
RM-18
Symbol No,
2890
2891
2802
2893
2894
2895
2896
2897
2898
2899
28100
28101
28102
28103,28104
28105
28106
28107
28108
28109
28110
28111 '
28112
2.11112
--2R114
28115
28116
28117
28118
211111'
28120
28121
28122
28123
28124
28125
28126
28127
28128
28129
28130
28131
28132
28133
28134
28135
,28136
28137
28138
28139
28140
28141
28442 to 28146
28147.28148
28149
28150
28151
28152
28153
28154
28155
28156
Stock No.
93175
51925
98077
53702
16239
215169
, 207833
206 726
206494
98956
Dtawing No.
90496-74
82283-167
82283*52
90496.74
82283-167,
82283-52
90496-74
82283-167
82283-52
90496-74
82283-167
90496-74
82283-50
82283-59
82283-80 ,
82283-68
337834-10
737829-29
82283-94
82283-173
82283?215
82283-86
746053-22
82283-173
82283-215
82283-86
82283-96
82283-173
82283-215
82283-86
82283-95
82283-171
82283-217
458574-90
82283-94
8811127-1
82283-165
99126-203
990 185- 301
82283-221
990185-226
82283-111
82283-159
8817665-21'
99126-74
82283-94
737667-12
735730-145,
82283-57
82283-94
82283-82
737630-20
82283-82
82283-64
82283-66 .
82283-67
82283-64
10.000 ohm 110%. 1 w'
2200 ohm t5%. 54 w
150 ohm *10%. 4 w
10.000 ohm *10%. 1 w
2200 ohm 35%. 1/4 w
150 ohm t10%. 34 w
10.000 ohm *10%. 1 o.,
2200 ohm *5%. 34 w
150 ohm t10%. 34 *
10.000 ohm *10%, 1 w
2200 ohm t5%. 34 w
10.000 ohm t10%, 1 *
100 ohm tI0%. 54 w
560 ohm t10%. 34w
33.000 ohm t10%. X
3300 ohm t10%. 34 w
Var. comp. 10,000 ohm i10%, 2 w
Not Used
Var. comp.. 2000 ohm t1096.
Not Used
470.000 ohm t10%. % w
DescHpUos
3900 ohm t5%. 34 w
220,000 ohm t5%, 4 w
100.000 ohm t10%. % * ,
Var. comp.. 1 meg. i204.'2 w
3900 ohm t5%. 34 w
220.000 ohm 35%. 34 w
100.000 ohm t10%. w
680,000 ohm /10%, 34w
3900 ohm *5%. 4 *
220,000 ohm 15%. 54 w
100,000 ohm t10%, 4 w
560,000 ohm t10%. 34Afr
3300 ohm t5%. 34 w
270.000 ohm t596, 54 w
wire wound, 56,000 ohm tn. 10 w
470,000 ohm 310%. 54 w
wire wound. 75 ohm t10%. 20 w
Comp.. 1800 ohm i5%. 34 w
68,000 ohm t5%, 2 w
carbon film. 1000 ohm t.1%. 4 w
390.000 ohm t596. 34 w
Carbon film. 182 ohm t1%. 34 w
Not Used
10 ohm 35%. 34 w
1000 ohm t5%. 34 w
'Wire wound. 1750 ohm 310%. 25 w
10,000 ohm *10%. 2 w
470,000 ohm t10%. 34w
Var. comp., 500.000 ohm /20%, 2 w
270 ohm t5%. 54 w
Not Used
390 ohm ?10%, 34 w
470.000 ohm tI0%. 54 w
47,000 ohm 310%. 54 w
Var. comp.. 1000 ohm 110%. 2
47,000 ohm i10%, 34 w
1500 ohm t10%, 34 w
2200 ohm t10%, 34 w
2700 ohm t10%. 54 w
1500 ohm *10%. 34 w
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
RM-19
Symbol No.
Stock No.
_
Drawing No.
Descritakm ,
_
2R157
82283-183
10.000 ohm t5%. % w
2R156
218766
990185-334
film. 2210 ohm t1%. 14 w
211159
82283-183
10.000 ohm t5%. 4 w
20160
218766
890185-334
fi1o. 2210 ohm *1%,
2R161 ,
99126-74
10.000 ohm *10%6 2 w
2R162
82263-94
470.000 ohm t10%. IA w
2R163
82283-61
820 ohm t10%. % w
2R164
82283-62
1000 ohm t10%. 3 w
2R165
Nos?Used "
2R166
16239
9811127-1
wik6 wound, 75 ohm ?10%, 20 w
211167 to 2R169
82263-74
Not Used
2R170
99126-74
10.000 ohm fi0%. 2 w
2R171
82283-183
10,000 ohm ?5%. 1/2 w
2S1
95572
8835332-2
Switch: push type. S.P.D.T.. black button
2r1
218137
8874796-2
Transformer: filament. pri.. 115/220 v. 50/60 cy.
2TB1 to 2TBI5
Terminal board: (Not stocked)
2XC71
207594
99100-7
Socket: Capacitor, octal tube type for (2C71)
2XK1
43639
849224-1
Socket! relay. 5 pin (for 2141)
2XK3
43639
649224-1
Socket: relay. 5 pin (for 21(3) ,
2XV1 to 2XV12
94879
737867-18
Socket: tube. 7 pin min.
2XV13.2XV14,
94860
984055-2
Socket: tube. 9 pin min.'
2XV15
98479
737867-18
Socket: tube. 7 pin min.
2XV16 to 2XV18
94880
984055-2
Socket: tube. 9 pin min.
2XV19 to 2XV21
94879
737867-18
Socket: tube. 7 pin min.
2Z1
216210 -
458907-502
Cavity Assembly: p00-2000 MC
95394
6831068-2
Washer: Spring. 7/8" O.D. x 21/32" I.D. x 0.025
thick beryllium copper, tuning core tension (for
2Z1)
95395
874927-6
'Nut: Hex. brass #5/8-24 thread, tuning core
locking for (2Z1)
94389
8834415-1
Insulator: teflon coated glass fabric 1-3/16 x
13/16 x 0.010 thick. crystal bypass 4 req'd. for
(2Z1)
94390
8834416-1
Contact: Beryllium copper, crystal bypass for
(2Z1)
95393
8831031-1
Core: Brass. tuning. 5/8-24 thread. 1-1/16" lg.
for (2Z1 tuning)
Miscellaneous
215719
458918-501
Cable- coaxial. 11-3/4" lg.. with 2 male
connectors '
215720
458918-502
Cable: coaxial. 20" lg.. with 2 male connectors
54392
8898625-501
Connector: male, coaxial. cable mtg.
52266
57421-30
Grommet: Rubber. 0.19 I.D. x 0.50 O.D. to fit
0.31 dia. chassis hole .
217095
8924133-6
Insert: for Jan tube shield. 7 pin min. 1-3/8"
high (for 2V10.2V21)
217094
8924133-5
Insert: for Jan tube shield 7 pin min. 1-3/4" '
high (for 2V1 to 2V8. 2V11. 2V12, 2V15. 2V19.
2V20)
217093
217092
8924133-4
8924133 2
Insert: for jun tube shield. 7 pin min. 2-1/4"
high (for 2V9) ,
Insert: for jan tube shield. 9 pin min. 1-15/16"
,
high (for 2VI3. 2V14. 2V16. 21/17. 2V18)
94391
8886111-2
Screw: thumb #10-32 x 1" lg. back cover holding
53016
99369-1
Shield: tube. 7 pin min. 1-3/8" high (for 2V10.
2V21)
54521
99369-2
Shield: tube, 7 pin min. 1-3/4" high for 2V1 to
2V6. ZVI/. 2V12. 2V15, 2V19. 2V20 .
210897
99369-3
Shield: tube. 7 pin min. 2-1/4" high (for 2V9)
56359
8858642-3
Shield: tube. 9 pin min. 1-15/16" lg. for (2V13.
2V14. 2VI6. 2V17. 2V18)
c
..
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
? .moone..
Approved For Release 2000/08/29: CIA-RDP79T01049A002600030002-8
RM-20
The following parts (available in kit form) are used in narrow band receivers only. All items
not shown are the same as those used in wide-band receivers.
Symbol No. I Pock No. I Drawing No.
I Description
RECEIVER/MODULATOR, NARROW-BAND MODIFICATION KIT, MI-31180
2C172
727868-245
Cppacitort mica, 820 Apf t5%, char "D?
21149
82283-137
Resistor: fixed, comp.', 120 ohm 35%, % w
' 21150
82283-151
Resistor: fixed, comp., 470 ohm ?5%, % w
211109
206880
737801-44'
Resistor: variable, comp., 10,000 ohm t10%, 2 *
211110
82283-175
Resistor: fixed, comp., 4700 ohm ?5%, % w
211129
82283-187
Resistor: fixed, comp., 15,000 ohm ?5%, % w
- 211167
82283-175
Resistor: fixed, comp., 4700 ohm t5%, % *
211168
82283-177
Resistor: 'fixed, comp., 5600 ohm t5%, % w
211169
82283-207
Resistor: fixed, comp., 100,000 ohm t5%, % w
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29 :-CIA-RDP79T01049A002600030002-8
221
hrt LFL
CCM.
ZVI
2L0
-1- --------------------------- 7 ----------------------------------------- - - - 7
I I I
Roo LE
GCBS 3110 LE 4TH LE I5TH LE GM LE 1ST LIM aro LIM I
GCBG GC136 =ND GCBG G.CNE GCS'
I 2W 21.I 2V3 Mt 2V4 21.21. I 2V5 21.26 2VO 2V7 ZOO I
T 2042 45 2C43 2C53 . I I
26174,
220
tots
64
2C58
Zr
21129
330
OA 2
2V,
42E29
Sc".
'woo
00
telt
LOC 0114
ss
C 2
'sow* 2,1
mat T
1500
5492 2094
ISO 2R95f 2200
21000
21.21 22
SC 13.
220
21199
Km-NO
2L21/
2.4
20109
1500
2530
390
20133
1000
2113.2
1*11
IW
2534
390
20156
1000
-412L64 12R143
eao
2535
12K?171
21.66
G.8
DRIVERS
214155
2700
20,51
1000
22201530 DISCRIMINATOR
2V2i-x
?f/26ALS
20146
470
-r
120160
11000
211149
47001
2C149
220
21050
4711
2VI9
EAHIG
2 I 58
2210
"1- 69
? CB
21.73
?L70
LOW
TUNED
2E1 '
25157?2c1G,
10 is /
2.4 2c T 2115
2.4
10001
21i4 2006
6?17 MOO
2L541
2133
C.II
20348 2R101
470 390
2L7I 20163I
10611 'o00TUNEL
L-
!grind-
SERV' Ci I - JD 2131
4701%
SJIS 2R1i
1 se .7.2010
.,1030
neuron roma
Looser snow.
AC Ni
ROMS
INV 1*
2
54137
1750-25W
Sc".
470
20147
11100
211152
4711
21647
390
20156
4700
A-4
20165
4.5-28
S
2RIS3
20156 '
is
?i7-41-t
20150 3
720 13.sv
21_57
6.8
20154
2200
so 58
no
2E2
AA7-0-4
20150
2210 1 2L72
c. 8
7 2 21- B
h6A L5
2c159 I
000
Al 31101MIN
AC'.,
ant
so our 5)
01.1110000 III
081/1110N1 ,
0133 00W
&Ch. AWL
I2AX7
2V1G
21?26
100
zosa
220K
2RGO
131(-2W
2R102
100
STANDBY
1*114 LOCKOUT
"" 12887
21/17
R113
Soil
21155
47011
2008
22.7
2?"8 20120
100.1
fAif.
LIN17 =
22011
laza izioci
? Rif 10016
sTANDBY
LOCKOUT
I 2ATT
21/113
125126
56K-93W
20104
010
211123
7
21015
'MEG
GROUND
11111
X3
tC69
1.01.12
2510
10K
211106 2154
3300 2205
ER159
47011
?R
RI
470A
2/uI2
3900
3500
LC116.
.011/0
260v
MOO
L
FAULT OfoCitaL AT
12 AT?
4,243
o 20- 4G,
000
12E3
54+1 2071-0
Moo Asv t_IOUF
04
? 2094
'500C SEE NOTZ.4
, T4'uP
--LALTF I
2501
27
2L60
544I am 1664
.t
ono
C.8
20125
T.047UF
)?1-
0-2035
1500
zR
2C NIK
1111
44ur
211.14
470
5v
064
220
2070
020
070
211180
68111
VI/
MOD
GANG
2vI2
20127
.0470
21.74
20110
21.57
21.Se
2373 21172
4700 3911.
ZW
ice*
220
70 MC AMPL
?CBC
ZVI'
21176
22K
2W
OSC
12AT7
2V13
ID
3 ZU13
820
W77 2C128
21147
2200
IN
2.443 2063
220 220
21041
2 2511116
.-2C125
1-""
2CA- M IWO
- OMR
1300 - L..3 111310
21177
9600
2LSG;
2R40
2711
2.15
DISCR
211154
27005
2JIS
LOCKOUT
Cmitener
3300
1.53
7061C
armor
2091
1120
2092
470
_J
2J9
2 0 152
1000,
2E30
4504
? FOR LIST Of PARTS REFER TO DWG mamas-so.
NOTES
I -TWuscrnis sZTVANBuy17 rvaEourimprio RELAY 2113 ARE REQUIRED WREN RECEIVER IS OPERATED
2-001101(011041 kr (2113-2 To 2K3-3) is OMITTED WHEN RECEIVER iS USED WA SYSTEM
*MTN STANDBY EQUIPMENT me srsoloas (mei I11010011 SERVICE CHAN SYSTEM.
3- LEGEND Of SIGNAL DEPENDENT VOLTAGES- UPPER VALUE IS FOR 140 SIGNAL, LOWER VALUE
IS FOR HIGH S12148. EXCEPT 1021113 uPPRR NALuE IS FOR LITTLE 011 160 SIGNAL- LOWER
IS FOP 2vi KILLED.
4. ADD LEADS .0.1.V. DISCONNECT LEAD 'I: AT 2099e sNORT PL47 *MEN RECEI /ER IS JSED
Ill TERMINAL STATION.
5-Mi.. CAPACITOR, R261571:0 AND CROKE eALJES ARE IN MICRO MICRoFARADs, 044.15
AND MIGROHENRIEs RESPECTIVELY UNLESS OTHEPANSE NOTED.
5-ADO 112.41)WAND LEAVE 0).' OPEN AT 'TERMINAL DROP REPEATER STATIONS UsiNG
11010011 SERVICE CHAN STSTEM.CONNECI CI TO 2 JI 3-2 AND 01417" 'R. FOR STATIONS
USING REPEATER SERVICE UNIT (MI-3M541OR TERMINAL SERVICE UNIT (mi 36196),
7-100 LEAD II' DISCONNECT AND '11(0 TO 2,112-5 AT TFIRIJ REPEATER STATIONS
USING INDICON SERVICE CHAN SYSTEM.
13-9CNEAINTI0 54130114 IS POP A.E01.1509 A11-31.1347. (0.120AW,),
9-20,6 ISA IN23E FOR PK 31184-224 (11M20)
ie.-FOR NARROW BAND OPERATION Oa 34104 3.4j EASEBAND AMPLIFIER STAGE(2.V15) AND
MODULATOR CAIN CONTI:, oL ARE MODIFIED AS SHOWN BELOw:
2CGRI FOR :OPPONENTS SEE 17416, 8978532
447 BB AMPL
Uf GCBS
!REG 21115
100
21064000
7
21143
1106
2R50
470
211107
4700
20172
820
211159
10011
1,20114
.2700
2116 211107
56 ? 1015
20G3 2J12
1.0 E_
0 <
C 511 ?-? ?
7?3 1( .<
40109
211110
4'O0 =
Dwg. No. 3L,40121
Rev. 3
RM-22
Figure RM-7-Receiver/Modulator-Schematic Diagram
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
? p
ittictg
? T,
lk
? 'iv !41"21
401 TAI,-
1111 0,0
1
1 liqlt
4.1,4
3/
In 41 1?
4
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
MICROWAVE COMMUNICATION EQUIPMENT
T.O. 3110.4?A.21
Terminal AFC Unit MI-31492-C
TECHNICAL DATA
DESCRIPTION
MAINTENANCE
REPLACEMENT PARTS
RADIO CORPORATION OF AMERICA
COMMUNICATION PRODUCTS DEPARTMENT, CAMDEN, NEW JERSEY
Approved tFomRelease 2000/08/29 : CIA-RDP79T01049A002600030002-8 IB-33228-2
DU 539
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
T.O. 31R5-4-A-21
Power Input
a. Filament Heaters: 19 watts at 115 v, 50/40
cycltes ac
b. Plate Supply: 95 milliamps at 250 v dc
TECHNICAL DATA
I-F Frequency
20 mc ?
Bandwidth
2 mc
Crystals
Symbol Type Function
3
C111 1N21B AFC Mixer
MI-31687?* Beating Oscillator
(See Note)
Tube Comp ement
Required R-F Input
mw
110 MC Output
2 volt
Symbol Type Function
6CB6 First i-f Amplifier
6CB6 Second i-f Amplifier
6CB6 Third i-f Amplifier
6CB6 Fourth i-f Amplifier
GALS Discriminator
12AT7 Oscillator/Multiplier
6U8 55 MC Amplifier and
Multiplier
3V8 6036 55 MC Oscillator
3V9 6AH6 Reactance Control
3V1
3V2
3V3
3V4
3V5
_ 3V6
3V7
Weight and Dimensions
Weight-7 lbs.
Height-51/4" ,
Depth Back of Panel: 27/8"
Depth Front of Panel: 21/2"
Width-19" Rack Mounting
AFC-1
NOTE: The letter-number suffix (*) of thc
MI-31687 crystal series is determined by the 'sys-
tem frequency assignment. Consult the system
instructions for Typical System Frequencies.
DESCRIPTION
The Terminal AFC Unit (M1-31492-C) is designed
for mounting in either a standard 19" open rack or
cabinet. It is mounted adjacent to the transmitter
unit and is used in terminal stations only. This unit
keeps the terminal transmitter stabilized at its as-
signed frequency. This is extremely important because
the frequency of the whole relay chain is controlled
The transmitter frequency is compared with a
reference frequency from a quartz crystal controlled
oscillator. The error voltage is used to "change the
frequency of a 55 mc oscillator, the frequency of
which is doubled in the multiplier stage. The mul-
tiplier output changes the receiver/modulator 1-F
mixer frequency which corrects the -transmitter
by the terminal station transmitter frequency. carrier frequency.
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
Approved For Release421460/0407t14413P79T01049A002600030002-8
\1t
1 I IIC bash. Ille rt'f111111.11
Al ( 'n1( 511 ;1102-t is g(nclaRti h? the tcs stal ion
trolled oscillator/mithipher l he IN:Tit:11c ot
the quart/ cr?stal 1,1 *1 of the cr?stal oscillator ;Vo
is calculated from the following equation:
2X
where: 1F, is the frequency of the quartz crystal
WI of the crystal oscillator
F, is the transmitted frequency
Fr is the received frequency
X is the multiple of the crystal frequency
and is found in thc following table:
F, F?
Range of 2
1720 mc to 1840 mc
1841 mc to 2000 mc
2001 mc to 2160 mc
2161 mc to 2320 mc
2321 mc to 2470 mc
2471 mc to 2640 mc
2641 mc to 2680 mc
Value of X
44
48
52
56
60
64
68
12.( ter to tht. s?stems book tut I\
Frequcti, Its
fit Ai "5 St till
The oscillator/multiplier ;VC, getwrates the
heterothning frequemy required in the ill miser
cavitN. The plate circuit of the oscillator se, tion
of iV6 is tuned to the frequency of the crystal ( I ).
The plate circuit of the multiplier section of iV6 is
tuned to the 4th harmonic of the crystal. The Output
of this stage is fed to the I N2 ID crystal in the resonant
mixer cavity 31.1. The other mixer frequency is
a sample of the microwave transmitter output
which is fed by coaxial cable to the R.F. CARRIER
INPUT terminal &II of mixer cavity 31,1. The trans-
mitter frequency is heterodyned with a high order har-
monic of the crystal multiplier to produce a differ-
ence frequency of 20 mc. The actual harmonic used
may be from the 11th to the 17th depending on the
3V9 343 3V5 3V4 3J9
3V3
3V2
3VI 3J2
3ZI
3TI
Figure AFC-1?Terminal AFC Unit, M1-31492-B and MI-31492.0?Front View
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
-saes Amis. AMMIN10111611.111?14.........
.???????
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
T.O. 31 R5-4-A-21
frequency of the transmitter. The harmonic used
is found by dividing the value of X in the equa-
tion, by four. The adjustable screw in the cavity
tunes it to the frequency of the signal from the
transmitter and the adjustable loop inside terminal
3J1 controls the amount of the signal input.
With the transmitter operating on its specified
i-f output of 3Z1 is 20 mc. The
mixer output is amplified through four i-f stages
and then applied to discriminator 3V5 which is
tuned to 20 mc. A 20 mc signal will cause a 0
discriminator output. Any variation of the trans-
mitter frequency will change the frequency of the
i-f input to 3V5 with a resultant dc discriminator
output voltage. The dc voltage from 3V5 is applied
to the reactance circuit of 3V9 which changes the
frequency of the 55 mc oscillator (3V8) relative
to the amount of dc applied to 3V9 from the dis-
criminator. The 55 mc output of 3V8 is doubled
in the amplifier/multiplier stage 3V7. A change
in the 110 mc output of 3V7 occurs only if the trans-
mitter output frequency tends to drift. The 110
mc output of 3V7 is fed to mixer .2V10 in the
receiver/modulator unit.
,In the receiver/modulator unit the 110 mc out-
put of the AFC unit heterodynes with the 40 mc
f-in signal in mixer stage 2V10 to produce the 70
mc subcarrier which modulates the microwave
carrier. Any variation in the 110 mc output fre-
quency of the AFC unit will cause 2V10, to either
increase or decrease the frequency of the 70 mc
signal carrier. Any fluctuation (increase or de-
crease) in the transmitter local oscillator (1V2)
frequency will be compensated for in the trans-
mitter mixer stage IV3) by a corresponding
decrease or increase in the 70 mc carrier frequency,
thereby correcting the transmitted microwave car-
rier frequency. (Refer to the terminal station block
diagram of the system book for the automatic fre-
quency control circuit.)
CONTROLS
a. The XTAL OSC tuning screw is for adjusting
the plate peaking coil 3L22 of the crystal oscillator
(the 1-2-3 section of 3V6) to the crystal frequency.
b. The OSC GRID pin jack 334 is used to con-
nect meter 1M1 to indicate when the crystal oscil-
lator (1-2-3 of 3V6) is tuned (by the XTAL OSC
m. The 110 MC OUTPUT jack 3J8 is used to
screw) to the frequency of the crysta1,3Y1.
connect the output of the 110 mc multiplier stage
c. The MULT tuning screws of coils 3L21 and (3V7-8-9-1) to the 110 MC INPUT jack of the
3L17 are for adjusting ,the multiplier stage (the receiver.
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
? AFC-3
6-7-8 section of 3V6) to the 4th harmonic of the
crystal oscillator.
d. The MIXER XTAL pin jack 3J2 is used to
connect meter IM1 to indicate when the multiplier
stage (6-7-8 of 3V6) is tuned to the 4th harmonic
of the crystal oscillator.
e. The crystal mixer cavity R.F. CARRIER IN-
PUT terminal 3J1 is the receptacle for connecting
the cable which supplies a sample of the. output
frequency from the transmitter.
f. The tuning screw of the crystal mixer cavity is
for resonating the cavity to the frequency of the
transmitter.
g. The LIMITER pin jack 3J9 is for connecting
meter IM1 to show when the crystal mixer cavity is
tuned to resonance at the transmitter frequency.
? h. The DISC pin jack 3J3 is used to connect
meter 1M1 when checking the discriminator dc
? voltage output ,when tuning the AFC and trans-
mitter.
The 55 MC OSC tuning screw of coil 3L24 is
for adjusting the frequency of the 55 mc oscillator
3V8.
j. The 55 MC OSC GRID pin jack 3J7 is used to
connect meter 1M1 to check the grid current when
adjusting 3V8 to 55 mc with the 55 MC OSC tuning
screw.
k. The 55 MC AMP tuning screw of coil 3L23 is
for adjusting the frequency of the 55 mc amplifier
' stage ( the pentode section, elements 7-2-3-6, of
3V7).
I. The MULT 3T3 tuning screw of transformer
3T3 is for adjusting the frequency of the 110 mc
amplifier stage (the triode section, elements 8-9-1,
of 3V7)-
-..r.1.1.51.10wm. ad*
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
T.O. 31R5-4-A-21
. AFC-4
MAINTENANCE
General Notes
a. To check the operation of the AFC unit
connect the test meter, IM1, test lead to the "DISC"
jack. IMI should read zero. When the transmitter
oscillator cavity is squeezed, the 1M1 reading
should increase to approximately 50 pa if the AFC
unit is working properly.
b. If the transmitter r-f output fails completely
one of the possible causes could be the failure of
the terminal AFC unit to deliver a 110 mc signal
to the modulator i-f mixer of the receiver/mOdula-
tor. There is no 70 mc drive to the transmitter
during the absence of the 110 mc frequency from
the terminal AFC unit.
c. If the terminal AFC unit is the cause of the
transmitter failure, check the tubes and replace the
ones that are bad. The four i-f tubes and discrimi-
nator tube (3V1 thru 3V5) can be changed without
retuning any of the circuits. If the oscillator/multi-
plier tube 3V6 is changed, tuning coils 3L21, 3L22,
3L17, 3L16, 3L15 and 3C39 should be repeaked as
follows:
1. Connect the transmitter test meter 1M1 to
the OSC GRID 3J4 and tune the XTAL OSC con-
trol 3L22 for maximum grid current. A reading
of at least 70 ?a should be obtained.
2. Connect meter IMI to the MIXER XTAL
jack 3J2 and tune the MULT controls 3L21 and
3L17. for maximum current. Since this is a double
tuned circuit it is advisable to keep the cores at
about the same depth, when tuning over any great
range, in order to get an initial reading to
maximize. The meter reading should be 25 pa or
more. (To obtain a peak indication when tuning
this circuit it may be necessary to remove the r-f
cable connecting the transmitter output to the crys-
tal cavity on the terminal AFC unit. The cable
should be replaced immediately after peaking the
circuit.)
d. If either the 55 mc oscillator, 110 mc multi-
plier or reactance tube (3V8, 3V7, 3V9) is changed,
the tuned circuits of these stages should be retuned
as described in the CIRCUIT ALIGNMENT section,
and the operation of the AFC system checked as
follows:
Approved For Release 2000/08/29:
Check the terminal AFC unit discriminator read-
ing by connecting the test meter 11'41 to the jack
marked "DISCR". If the meter reading is not zero,
adjust the 55 MC OSC control 3L24 very slowly
until the meter reads zero. The transmitter AFC
motor may run when the 55 mc oscillator frequency
is changed slightly. After a slight change in the fre-
quency of the 55 mc oscillator is made, wait for the
AFC tuning motor indicator light to go out before
continuing adjustment. Keep adjusting 3L24 in this
manner until the DISC reading is zero. If this ad-
justment is considerably off the correct point, a zero
discriminator current will also be observed, but in.
this case of improper adjustment, there will be a
very small reading of limiter current on this unit
instead of the normal value of 25 pa or more. After
the zero reading is reached tune the 55 MC AMP and
MULT. 3T3 controls for maximum output at 30
as described in item (b) of the 55 MC Oscil-
lator/Multiplier Circuit test in the following CIR;
CUIT ALIGNMENT section.
CIRCUIT ALIGNMENT
The following headings contain detailed align-
ment and test procedure for all the circuits of the
terminal AFC unit. These tests and alignments
should be made with the unit on a test bench. The
test items specified in the following procedures re-
fer to the test equipment items listed in the test
equipment tables of the system instructions. Use test
item 19 to supply power to operate the terminal
AFC unit.
Crystal Oscillator Circuit Test
Connect the microammeter to 3J4 (OSC GRID)
and adjust the XTAL OSC control 3L22 for maxi-
mum grid current as indicated on the meter. A cur-
rent reading of 80 jta or more indicates satisfactory
operation.
Multiplier Circuit Tuning Adjustment
Connect the microammeter. to 3J2 (MIXER
CRYSTAL) and tune the MULT controls 3L21
and 3L17 for maximum current. A reading of 50 pa
is adequate. Be sure the current can be maximized
by tuning either coil.
55 Mc Oscillator/Multiplier Circuit Test
a. Connect the rnicroammeter to 3J7. Ground
the junction of 3R35 and 3R37. With the core of
3L25 in the mid-position adjust the 55 MC OSC
CIA-RDP79T01049A002600030002-8
Approved For Release 2000/04T20,C34M1**02149A002600030002-8
?.1 I
3L1 .
3L27
3R39 3CRI 3C3 3R3 3R50 3R7 3L3 3RII 3VX3 3J9 3R38 3RI5
3VX4
3R4 3C35 I 3L201 3 J 2 \ 3VXI 3VX 2 31I3 3C9 3CII 3L4 3R4I 3C36 3CI5 3V X 5
3L6
3C50 1
3C43
3J5 3L17 3C42 3R51 52- ,13C69
3L28 3L21 3L12 3J4 3R42 3
X6 3-5 3L22
3C8 3-12 3Cl2
3- 13 3J7
36 3XV7 3C58 3 23
77449
R9 3C10 3RI3 3CI4
3C34
3R 35
3L7
3V X9
3R67
3L24
3L25
3J3
3R66
3VX8
3L26
3L5
Figure AFC-2?Terminal AFC Unit, Ml-31492-C----Rear View, Dust Cover Removed
control 3L24 for a frequency of 55 mc. (Use test
item 13). Adjust 3L25 for a reading of 55 p.a. Re-
adjust the frequency, if necessary, to 55 mc 2;0.1
MC.
b. Connect the r-f voltmeter (test item 22) to the
110 MC OUTPUT jack 3J8 and adjust the 55 MC
AMP Control 3L23 and the MULT 3T3 control for
maximum output. A reading of at least 2 volts must
be obtained.
Discriminator and I-F Alignment
a. Connect the CRO to 3V5-5.
b. Connect the 20 mc sweep generator (test item
18) output to 3V4-1.
c. Adjust 3L5, 3L6, and 3L8 for the correct dis-
criminator response. No great amount of time
should be spent in obtaining exact linearity. It is
essential that the alignment be such that the dis-
criminator peaks are 3 mc apart and that cross-
over is located at 20 mc. Remove the sweep gen-
erator and oscilloscope.
d. Connect the microammeter to the LIMITER
jack 3J9.
e. Connect the signal generator (test item 16)
to 3V3-1 and set it for exactly 20 mc.
f. Tune 3L4 for a maximum meter reading. Re-
duce the signal generator output for a meter reading
of approximately 50 ?a.
g. Move the signal generator to 3V2-1 and tune
3L3 for a maximum reading at 3J9. Adjust the
signal generator for a meter reading at 3J9 of ap-
proximately 50 p.a.
h. Move the signal generator to 3V1-1 and tune
3L2 for a maximum reading at 3J9. Adjust the
signal generator for a meter reading at 3J9 of ap-
proximately 50 ?a.
i. Connect the Voltohmyst probe to 3V5-1. Use
the most sensitive scale. While maintaining the
signal generator output to produce limiter satura-
tion, tune 3L6, 3L7 and 3L8 so the crossover voltage
is exactly at 20 mc and the two peaks are at 18.5
and 21.5 mc -?0.2 mc and of approximately equal
amplitude. Coil 3L7 controls the amplitude, 3L6
the high frequency peak and 3L8 the low frequency
peak. Remove the signal generator, microammeter
and Voltohmyst.
I.F. Gain Measurement
a. Connect the microammeter to 3J9 (LIM-
ITER).
b. Remove the 1N21B from its socket.
c. Connect the 20 mc signal generator to the low
end of 3L1.
d. With sufficient output to get a small reading
on the microammeter tune 3L1 for a maximum re-
sponse at 20 mc.
e. It should now require not more than 2000 ?v
to obtain a reading of 100p.a at 3J9 (LIMITER).
Reactance Tube Sensitivity Test
a. Connect the Voltohmyst to the DISC jack 3J3
with the signal generator connected as in (c) of the
I-F Gain Measurement test.
b. Tune the signal generator to 20 mc for a zero
reading at 3j3.
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
AFC-6
Approved For Release 2000/08/29: CIA-RDP79T01049A002600030002-8
T.O. 31R5-4-A-21
c. With the conditions as above, tune the 55 MC
OSC control 3L24 for a 55 mc mc frequency
reading. Measure the frequency at the 110 MC
OUTPUT jadt 3J8 using ten item 13.
d. Change the frequency of the 20 mc signal gen-
erator until the Voltohmyst reads 1 volt and again
measure the frequency at 3J8. The difference be-
tween this measurement and that at (c). should not
be less than ?.-1 mc.
R-F Mixer Circuit Test
a. Replace the 1N21B.
b. Orient the plane of the loop on 3J1 (R-F
CARRIER INPUT) perpendicular to the long axis
of 3Z1.
c. With the unit operating normally, connect
the 2700 mc signal generator (test item 17) to R-F
CARRIER INPUT 3.11.
d. Connect the microammeter to 3J9 (LIM-
ITER).
e. With the signal generator set for approxi-
mately 1 milliwatt output, tuning the signal gen-
erator to the correct frequency should give a re-
sponse in the i-f amplifier as indicated on the
microammeter.
NOTE: There are several frequencies that will
give a response. For a given crystal frequency,
signal generator frequencies at which a re-
Sponse will be obtained are equal to the crys-
tal frequency, in megacycles, multiplied by 44,
48, 52, 56, 60, 64 or 68 with 20 mc added or
subtracted from the product.
f. 3Z1 should be tuned for a maximum i-f
response. The reading at 3J9 must be at least.
40 ma.
g. ,Retune 3L1 for maximum response.
TYPICAL TERMINAL AFC VOLTAGE AND METER READINGS
The following are approximate voltages existing between the indicated tube pins and ground as meas-
ured with a Voltohmyst with 100,000 ohms in series with the measuring probe. All voltages are dc unless
otherwise noted:--
Tube
Type
Function
Pin
#1
Pin
#2
Pin
#3
?
Pin
#4
Pin .
#3
Pin
#15
in
#7
Pin
#8
Pin
#9
3V1
6CB6
I-F Ampl.
0
2
6.3 ac
0
210
140
0
?
3V2
6CB6
I-F Ampl.
0
2
6.3 ac
0
210
140
0
?
?
3V3
6CB6
I-F Ampl.
0
2
6.3 ac
0
210
140
0
?
?
3v4
6a36
Limiter
0
1.2
6.3 ac
0
60
80
0
?
?
3V5
6AL5
Detector
0
var*
6.3 ac
0
var*
0
var.*
?
3V6
12AT7
Crystal Osc./Mult.
180
0
2.7 ac
0
0
220
0
9.6
6.3 ac
3W
6U8
55 mc Amp./110
mc Mult.
130
0
110
0
6.3 ac
200
1.6
2.5
0
3V8
12AT7
55 inc Osc.
160
0
0
0
0
160
0
0
6.3 ac
3V9
6AH6
React.
var*
3.3
6.3 ac
0
160
140
3.3
?
?
var*?variable with signal level and frequency.
The following are typical meter readings obtained using the 200 microampere test meter (1M1) in the
transmitter unit.
Mixer Xtal. (3J2) ? ?15 to ?75 pa
Disc. (33.3) ? zero for on-frequency operation; up to off scale plus or minus for off-frequency
operation
Osc. Grid (3,14) ? ?110 pa
55 mc Os. Grid (3J7) ? ?45 pa
Limiter (30) ? ?25 pa
pprove or e ease 2000/0:129 : CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
T.O. 31R5-4-A-21
Appr
AFC-7
REPLACEMENT PARTS LIST
TERMINAL AFC UNIT-MI-31492.4
Symbol No.
Description
Drawing No.
Stock No.
3C1, 3C2, 3C3
Capacitor, fixed ceramic, 1500 mmf, +100 -0%, 500 v.
449696-3
73748
3C4
Capacitor, fixed ceramic, 220 mmf, ?20%, 500 v.
735717-133
10 20 15
3C5, 305, 3C7
Capacitor, fixed ceramic, 1500 mmf, +100 -0%, 500 v. Same as 3C1
449696-3
73748
3C8
Capacitor, fixed ceramic, 220 mmf, -1:20%, 500 v. Same as 3C4
735717-133 ?
10 20 15
3C9, 3C10, 3C11
Capacitor, fixed ceramic, 1500 mmf. +100 -096, 500 v. Same as 3C1
449696-3
73748
3C12
Capacitor, fixed ceramic, 220 aunt, -1:20%, 500 v. Same as 3C4
735717433
10 20 15
3C13, 3C14
Capacitor, fixed ceramic, 1500 ronsf, +100 -096, 500 v. Same is 3C1
449696-3
73748
3C15
Capacitor, fixed ceramic, 15 mmf, *20%, 500 v. :
735717-119
94195
3C16
Capacitor, fixed ceramic, 4700 mmf, -.1100 -096, 500 v.
990119-11
73473
3C17 to 3C27
Not used.
3C28
Capacitor, fixed ceramic, 1500 mmf. +100 -0%, 500 v. Same as 3C1
449696-3
73748
3C29
Not used.
3C30 _
Capacitor, fixed ceramic, 1500 tnmf, +100 -0%, 500 V. Same as 3C1
449696-3
73748
' 3C31, 3C52, 3C33
Not used.
i
3C34
Capacitor, fixed paper, 0.1 mf, ?10%, 400 v.
735715-175 '
73551
3C35
Part of 3Z1.
3C36
Capacitor, fixed ceramk, 1500 mmf, +100 -096, 500 v. Same as 3C1
449696-3
' 73748
3C37 to 3C41 '
Not used.
3C42
Capacitor, fixed mica, 8 mmf, -?596, 300 v.
748252-308
205068
3C43
Capacitor, fixed mica, 10 mmf, -?-596, 300 v.
748252-310
59905
3C44 to 3C49
Not used.
3C50
Capacitor, fixed ceramic, 1.5 mmf, -?0.25 mmf, 500 v.
722401-54
78928
3C51, 3C52, 3C53
Capacitor, fixed ceramic, 820 mmf, +100 -0%, 500 v.
449696-1
94190
3C54
Capacitor, fixed ceramic, 27 mmf. -?596, 500 v.
90575-219
79488
3C55
Capacitor, fixed ceramic, 820 mint +100 -0%, 500 v. Same as 3C51
449696-1
94190
3C56
Capacitor, fixed ceramic, 8 mmf, :1=0.5 mmf, 500 v.
90575-207
99600
3C57
Capacitor, fixed ceramic, 820 mmf, +100 -096, 500 v. Same as 3C51
4496964
94190
3C58
Capacitor, fixed ceramic, 100 mmf, -?20%, 500 v.
735717429
10 185 3
3C59, 3C60
Capacitor, fixed ceramic, 820 mmf, +100 -0%, 500 v. .Same as 3C51
4496964
94190
3C61
Capacitor, fixed ceramic, 470 mmf, ?20%, 500 v.
735717-637
75198
3C62, 3C63
Capacitor, fixed ceramic, 820 mmf, +100 -096, 500 v. Same as 3C51
449696-1 '
94190
3C64
Capacitor, fixed ceramic, 100 mmf, -..P.:20%, 500 v. Same as 3C58 .
735717-129
.
10 1853
3C65
Capacitor, fixed ceramic, 820 mmf, +100 -0%, 500 v. Same as 3C51
449696-1
94190
3C66
Capacitor, fixed ceramic, 100 mmf, -1:2096, 500 v. Same as 3C58 ...
735717-129
10 1853
3C67
Capacitor, fixed ceramic, 470 mmf, -2:20%, 500 v. Same as 3C61 .
735717-637
75198
3C68
Capacitor, fixed ceramic, 820 mmf, +100 -0%, 500 v. Same as 3C51
449696-1
94190
3C69
Capacitor, fixed ceramic, 10 mmf, ?0.5 mmf, 500 v.
90575-209
98225
3CR1
Rectifier, germanium diode
1N21B
67876
3J1
Connector, female, coaxial, coupling loop assembly, chassis mtg. .. .
8834436-501
94231
3J2, 333, 314
Connector, female, pin jack
742565-1
93678
335
Connector, male, 6 contact, chassis mtg.
181494-3
28507
336
Not used.
337
Connector, female, pin jack. Same as 332
742565-1 '
93678
338
Connector, female, coaxial, chassis mtg.
8845666-1
94205
339
Connector, female, pin jack Same as 332
742565-1
93678
plOPF1...F44?16-g&da?Le.a.....p41"
??? ..." ??????? -? ? - - -
---
. - u49A0 2600030002-8
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
TO. 31R5-4-A-21
AFC-8
Symbol No.
' Description
Drawing No.
Stock No.
3L1
Coil, adj. iron core
629132-507
94240
314, 314, 31.4
Coll, adJ. Ikea core
629152.50$
94250
3L$
Coil, adj. iron core
629132-501
94251
31.6
Coil, adj. iron core
629132-505
94236
3L7
Reactor, r-f choke, 50 microhenryt
8834437-502
94242
31-8
Coil, adj. iron core. Same as 3L5 '
629132-501
94251
3L9, 3L10, 3L11
Not used.
3L12
Reactor, r-f choke, 2.4 microhenrys
8834424-501
94040
31.13
Reactor, r-f choke, 2.4 microhenrys. Same as 3L12
8834424-501
94040
3L14 to 3L16
Not used.
3L17
Coil, adj. core, mutt. plate tuning, 160 mc. '
8864102-4
204735
3L18, 3L19
Not used.
3L20 ,
Reactor, r-f choke, 6.8 microhenrys
941524-245
217800
3L21
Coil, adj. core, mult. plate tuning, 160 mc. Same as 3L17
8864102-4
204735
3L22
Coil, adj. core, osc. plate tuning, 40 mc.
8864102-2
204736
3L23
Coil, adj. core, 55 mc. plate output tuning
8864101-1
204737
3L24
Coil, adj. core, osc. plate tuning, 55 mc.
8864102-3
204738
3L25
Coil, adj. core, osc. grid tuning, 55 mc.
629132-517
94245
3L26
Reactor, r-f choke, 6.8 microhenrys. Same as 3L20
941524-245
217800
3L27
Reactor, r-f choke, 2.4 microhenrys. Same u 3L12
8834424401
94040
3L28
Reactor, r-f choke, 39 microhenrys '
473909-39
205859
3R1, 3R2' , _
Not used.
310
Resistor, fixed composition, 180 ohm, ?1096, 11/2 w?
82283-53
3R4
Resistor, fixed composition, 47,000 ohm, -JAM 1 w
90496-82
3R5
Resistor, fixed composition, 4700 ohm, -1.-2004, 1 w.
9049647
3R6
Resistor, fixed composition, 1500 ohm. -I:1096, 1/2 w.
82283-64
3R7
Resistor, fixed composition, 180 ohm, ?10%. 1/2 w. Same as 3R3
82283-53
3R8
Resistor, fixed composition, 47,000 ohm, 1=1096, 1 w. Same as 3R4
90496-82
.
3R9
Resistor, fixed composition, 4700 ohm, -?2096, 1 w. Same as 3R5
90496-17
3R10 '
Resistor, fixed composition, 1500 ohm. -?1096, 1/2 w. Same as 3R6
82283-64
31111
Resistor, fixed composition, 180 ohm, -?1004, 1/2 w. Same as 3R.3
82283-53
3R12
Resistor, fixed composition, 47,000 ohm, ?-1096, 1 w. Same as 3R4 .
90496-82
3R13
Resistor, fixed composition, 4700 ohm, ?2096, 1 w. Same as 3R5 ..
90496-17
3R14
Not used.
3R15
Resistor, fixed composition, 180 ohm, -?1004, 1/2 w. Same as 3R3 ...
82283-53
3R16
. ... .
Resistor, fixed composition, 22,000 ohm, -...t20%, 2 w.
99126-21
3R17--
Resistor, fixed composition, 4700 ohm, ?10%, 1/2 w.
82283-70
3R18, 3R19
Resistor, fixed composition, 27,000 ohm, -?1096, 1/2 w.
82283-79
3R20 to 3R29
Not used.
3R30
Resistor, fixed composition, 27,000 ohm, ?1096, 1/2 w. Same as 3R18
82283-79
3R31 to 3R34
Not used. ,
3R35
Resistor, fixed composit:on, 4700 ohm, -.1.-1070, 1/2 w. Same as 3R17
82283-70
3R36
Not used.
3R37
Resistor, fixed composition, 1 meg. :L-20% 1/2 w
82283-31
3R38
Resistor, fixed composition, 100 ohm, -?-596, 1/2 w.
82283135
31139
Resistor, fixed composition, 3900 ohm, -?100/9, 1/2 w.
82283-69
3R40
Resistor, fixed composition, 33 ohm, -?-10%, 1/2 w. (part of 3J1 assy) .
82283-44
3R41
Resistor? fixed composition, 3900 ohm, -?1096, 1/2 w. Same as 3R39
82283-69
3R42
Resistor, fixed composition, 3300 ohm, ?10%, 1 w.
90496-68
3R43,
to 3R49
,
Not used.
Approved For Release 2000/08/29 : IA-RDP79T01049A002600030002-8
Approved For Re leas; 2000/08/29 : CIA-RDP79101049A002600030002-8
T.O. 31R5-4-A-21
AFC-9
Symbol No.
Description
Drawing No.
Stock No.
3R50
Resistor, fixed composition, 10 ohm, ?1096, 1/2 w.
82283-38
3E11
Resistor, fixed composition, 27,000 ohm, ?1096, 1/2 w. Same es 3R18
82283-79,
3R52
Resistor.,fixed composition, 100 ohm, ?1096, 1/2 w.
82283-50
3R53
Resistor, fixed composition, 1000 ohm, ?1096, 1/2 w? ,
82283-62
3R54
Resistor, fixed composition, 270 ohm, ?1096, 1/2 w.
82283-55
3R55, 3R56
Resistor, fixed composition, 8200 ohm, -?1096, 2 w.
99126-73
3R57
Resistor, fixed composition, 390 ohm, -1.-1096, 1/2 w.
82283-57
3R58
Resistor, Med composition, 180 ohm, ?10%, 1/2 w. Same as 3R3
82283-53
3R59
Resistor, flxd composition, 6800 ohm, d..-10%, 1/2 w.
82283-72
3R60
Resistor, fixed composition, 68,000 ohm, ?1096, 1/2 w.
82283-84
3R61 -
Resistor, fixed composition, 5600 ohm, -?1096, 1/2 w.
82283-71
3R62
Resistor, fixed composition, 22,000 ohm, ?...1096, loi w.
82283-78
3R63
Resistor, fixed composition, '1500 ohm, -I:1096, 1/2 w. Same as 3E.6 .
82283-64
3R64
Resistor, fixed composition, 180 ohm, -..1-1096, 1/2 w. Same as 3R3
82283-53
3R65
Resistor, fixed composidon, 1000 ohm, ?1096, 1/2 w. Same as 3R53
82283-62
3R66
Resistor, fixed composition, 4700 ohm, ?10,716, 2 w. .......,
99126-70
-,
3R67
Resistor, fixed composition, 47,000 ohm; ?1096, 1 w. Same as 3R4
90496-82
n.
3R68
Resistor, fixed composition, 100,000 ohm-, ?1096, 1/2 w. . , . ...,...... .
82283-86
,
3T1 ,
3T2
Transformer, filament
Not used.
949385-1
94196
3T3
' Transformer, adj. core, multiplier output, 110 mc. .1... ...... :
8864100-1 .
204739
3X1 to 3X5
Socket, 7 pin min.
737867-18
94879
3X6, 3X7, 3X8
Socket, 9 pin min.
984055-2
94880
3X9
Socket, 7 pin min. Same as 3X1
737867-18
94879
3X10
Socket, crystal, 2 contact, steadte
8885952-1
? 79970
3Z1
Cavity Assembly (associated parts below)
458907-501
Core, brass tuning core, 1/2-24 thread, 1%e 1g., 1Z1 tuning
8831031-1
95393
Contact: beryllium copper, for 1Z1
8834416-1
94390
Pt. of 3C35
Insulator: teflon coated glass fabric, lt)16" x 33/40" x .010" thick
8834415-1
? 94389
Washer, spring, 7/s" OD x 2%2" ID x 0.025" thick ber011ium corer,
tuning core tensionI
8831068-2
95394
Nut, hex, brass 1424 thread, tuning core locking
874927-6
95395
Miscellaneous
'Connector, male, coaxial, cable mtg. ,....
8898625-501
54392
Screw, thumb *10-32 thread, back panel holding
8886111-2
94391
Shield, tube, 7 pin min., IW lg.
99369-1
53016
Shield, tube, 7 pin min., 13/4" lg.
99369-2
54521
Shield, tube, 9 pin min., Mis" lg.
8858642-3
56359
....I
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
3J 1
3R 40
33
3 Z I
3CRI
14
IN 218
3L1
3C35
HE-?
C51
I 5T I F
CBG
3L2
1.E.
3C2 3C3
( ? )1
1500 1500
r:
3L 20
6.8uH
3115
lall
1.5
3C50 71-N
3C I
1500
3R 501
'0
1500
A
3J2
kitULT
31._17 3(21
3C 43.44 44
tOT
3C69
10
2 NL) IF
6CE56
3RD IF
6 c BG
5v/X3
co 0
N
(r) N 7
3RS
180
3C52 3C53
J820 820-r- 3R42
05C.
1 2. AT 7 306
3300
44r1
CA11
31.22
3v I
31110
1 in o
rr N c)
r?i Cc 0
3C51 cr)
I OF
3J4
117
111
2
to
HO mCbAULT .5.5mC.AMPL.
GU g
307
3J8
T3T3
?
4=.
e
TSc.56
8
3R56
8200
.3,r5c
820
820
3R52
100
tel
Cr
3C57
820
I ?
3 R59
3 t9
1500
34.4
MAO 3C11
1500 1500
T.O. 31R5-4-A-21
4 T F
6C6
3L5
RI I
180
+3C62
820
r.8 ,<
3R58
ao ,t0)
-
3C51 3CGO
820 820
3C 61
470
0.1
Cr)
3V/ X44
o
(1)
3C 13
6 ?1(
1500
*-
3R15
180 (1-1
3RI6
22K
2W
ft
If '
GA L 5
3C $6
4700
3R 30
3J.>
27K
SSMC OSC REACT
l2AT7
3V/X8 3V/X9
3R35
4700
7
3R62
22K
3J7_
820
3C 64
1
100
3R63
1500
3L24
3C66
E-
3L 25
la? 3CC,7
470
3C65
820 3L26 ct
6.8UH
3L2.8
??6-6
39UH.
3L 27
V6
V 2
4
VI
V3
-3
V S
V9
44
54
2.4UH. 3L12
2.4 UH
rifirn
3C28 3Lit
1500 2.4U11
7
3R68
100K
3C8o
820
3R 66
3R 67
470 0 47K
We
3R37
IMEG.
ALL. CAPACITOR VALUES GIVEN IN UUF ALL RESISTOR
VALUES GIVEN IN OHMS AT 1/2Vki UNLESS OTHERWISE SPECIFIED
C -751277-5
Figure AFC-5?Terminal AFC Unit, MI-31492-C?Schematic Diagram
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
T.O. 31R54.A-21
AFC- 13, AFC- 14
NOTES:
I. NUMBERS /A/ WIRES ARE WIRE NUMBERS (SEE TABLE)
2. WIRES IN CABLE'S IlAkr Pi/RENUMBERS AND DesT/M.97/0?YS
AT EACAI END.
3. WNERE A TINNED COPPER WIRE MS 565 TI/RU A SOLDER LUG
A HEAVY Dor INDICATES rAcdr IT Sh/OhILD BE SOLDERED TO THE Lye.
4. SOLDER ALL ELECTRICAL CONNECT/ONS US/NC PT SO.
S. SOLDER LLICS ON COILS ARE DELINEATED FOR CONVENIENCE /A/
SHOWING CONNECTIONS
WIRE TABLE
88 34 402-504
WIRE NO
(INCLUSIVE)
DESCRIPTION
PS NUMBER OR
DRAWING NO.
PARTS L/ST
/ rrm NO.
WIRE NOS
NOT USED
COLOR AND CONDUCTOR ,
'
/ TO 7
WhIT-ARN /0/0/0
PS-805- 8
' 57
/3 TO /6
WAIT-RED /0/03
05- 8
58
2/
WIT- RED 7/0/0
PS- e 05 6
6!
24
WAIT- YEL AeLK y. 0 le
isw r 71-0761?
PS- 505-6
PS- SO5-6
60
5-9
27
...TO
ISRAID CABLE 72,1,7012
PS-4.99-53
55"
33 ro os '
rim/6yr ma/2ER AVIIW.LISZLI
PS- /03
57
.57 TO 66
' &ACM /NS. TUB/4/6' .042D. _
PS-8
56
D-636612 -I
Figure AFC-6?Terminal AFC-Unit, MI-31492-C?Connection Diagram
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
MICROWAVE COMMUNICATION EQUIPMENT
T.O. 31R5-4-A-21
Baseband Unit MI 31910
? TECHNICAL DATA
? DESCRIPTION
? MAINTENANCE
? REPLACEMENT PARTS
RADIO CORPORATION OF AMERICA
COMMUNICATION PRODUCTS DEPARTMENT, CAMDEN, NEW JERSEY
/IliAVM ARelease 2000/08/29 : CIA-RDP79T01049A002600030002-8 113-33305
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
1.0. 31R5-4-A-21'
B-1
TECHNICAL DATA
Power tor*
Filament Heaters
20 watts at 115 v., 50/60 cycles cc
Plate Supply
80 ma at 250 v. dc, ripple less than 0.030 volt
Input Impedance
Receiving Amplifier
2200 ohms (From the baseband amplifier of the
receiver/modulator unit)
Transmitting Amplifier
Multiplex: 135 ohms unbalanced (From the chan-
nelling equipment)
Service Channel: 100,000 ohms (From the service
unit)
'Input Level
Receiving Amplifier
Multiplex: 0.028 volt per channel
Service Channel: 0.019 volt
Transmitting Amplifier
Multiplex: ?26 dbm per channel (0.0184 volt)
Service Channel: 0.258 volt
Output Impedance
Receiving Amplifier
Multiplex: 135. ohms unbalanced (To the chan-
nelling equipment)
Service Channel: 22,000 ohms (To the service
unit)
Transmitting Amplifier
Less than 100 ohms (To the frequency modulator
of the receiver/modulator unit)
Output Level
Receiving Amplifier
Multiplex: ?20 dbm per channel (0.037 volt)
Service Channel: 0.61 volt
Transmittong Amplifier
Multiplex: 0.071 volt per low frequency channel
Service Channel: 0.048 volt
Tube Complement
? Symbol ,Type Function
4V1 6CB6 Transmitting Baseband and Serv-
ice Channel Amplifier
4V2 6CL6 Transmitting Cathode Follower
Output Stage
4V3 6AW8 Transmitting Service Channel
Cathode Follower/Receiv-
ing Service Channel Amplifier
4V4 5965 Receiving Adding Amplifier
4V5 6C136 Receiving Baseband Amplifier '
4V6 6CL6 Receiving Cathode Follower Out-
put Stage
Weight and Dimensions
Weight: 8 lbs.
Height: 31/2 inches
Depth front of panel: 21/2 inches
Depth back of panel: 4 inches
Width: 19 inches
DESCRIPTION
The baseband unit is designed for amplifying the
signals passing to and from the channelling equip-
ment (frequencies between 3 kc and 600 kc) and
to and from the service unit (frequencies between
300 cps to 3 kc) at terminal and drop repeater
stations.
The baseband unit amplifies the multiplex and
service channel signals from the channelling equip-
ment and service unit to the proper level and
transfers them to the receiver/modulator units. It
also amplifies the received signals (300 cps to 600
kc) from the receiver/modulator to the correct level
before they are sent to the channelling equipment
and service unit.
The baseband unit consists of two independent
amplifier circuits. The transmitting amplifier (4V1,
4V2 and 4V3A) feeds the multiplex and service
channel signals to the receiver/modulator units.
It has two inputs, one for the multiplex signals and
the other for the service channel signals and two
Approved For Release 2000/08/29 : CIA-R
outputs, one for each receiver/modulator unit?The
receiving amplifier (4V3B, 4V4, 4V5 and 4V6)
accepts the received signals and feeds them WI the
channelling equipment and the service Unit': It
has two inputs, one for each of the two possible
receiver/modulator units and two outputs,i,one for
the multiplex signals and the other for.. service
channel signals.
There are two separate signal paths in the base-
band unit. One path is from the multiplex signal
input terminal 4J4-1 and the service channel -input
signal terminal 4J3-2, through the transmitting
amplifier and cathode follower to output terminals
4J1-2 and 4J2-2. The transmitting amplifier con-
sists of amplifier ? stage 4V1 and cathode follower
output stage 4V2. The service channel signals are
fed to amplifier 4V1 through cathode follower
stage 4V3-A. The 3 kc to 600 kc signals from the
channelling equipment are connected to the it)put
circuit of 4V1 through 4AT1. 4AT,J is a 1 to 15
DP79T01049A002600030002-u
Approved For Release 260061R5rAllkE21179T01049A002600030002-8
B-2
Figure 13-1?Baseband Unit?Front
db attenuator provided to set the signal level to
amplifier 4V1 in order to obtain the correct output
voltage at 4J1-2 and 432-2 to the receiver/modu-
lator units. It contains individual pads of 1, 2, 4
and 8 db loss which can be connected in cascade
to give the desired attenuation. The service channel
signals (300 cps to 3 kc) from the service unit
are applied to cathode follower 4V3-A the output
of which is fed to amplifier 4V1. The output of
4V1 which contains both multiplex and service
channel signals is applied to 4V2. The output of
cathode follower 4V2 is fed to the frequency modu-
lator of the receiver/modulator units.
A second signal path is from 431-5 and 4)2-5,
the input terminals fox the received multiplex and
service channel signals from the receiver/modulator
units, through the receiving amplifier to the multi-
plex signal output terminal 434-5 and service
channel output terminal 4J3-5. The receiving
amplifier is composed of 4V3B, 4V4, 4V5 and 4V6.
It utilizes a separate output amplifier and cathode
follower (4V5 and 4V6) for the multiplex signals
and another output amplifier (4V3B) for the serv-
ice channel signals. The input stage is a 5965
dual triode tube (4V4) which serves as an adding
amplifier for the signal from the E-W and WE
receiver/modulators at a repeater station. From
4V4 the signals are applied to separate amplifiers
4V3B and 4V5. The service channel signals (300
cps to 3 kc) in the output of 4V3B are fed to the
View
service unit. The multiplex and service channel
signals (300 cps to 600 kc) are amplified by 4V5
and delivered to the multiplex equipment. Al to
15 db attenuator provides a means of setting the
output of amplifier 4V6 to obtain the proper signal
level of ?20 db to the channelling equipment. The
attenuator contains individual pads of 1, 2, 4 and
8 db loss which can be connected in cascade to give
the desired attenuation. Connections to the asso-
ciated units including the power supply are made
through interconnecting cables to Jones plugs on
the front of the unit.
Attenuators 4AT1 and 4AT2
Connections to 4AT1 and 4AT2 are made at the
factory and need not be changed thereafter. The
individual pads are connected in cascade to obtain
the required attenuation. Attenuator 4AT1 is con-
nected between terminals 4J4-1 and 4XZ1-F. The
required pads are connected together so that with
an input of ?26 dbm the output of the transmitting
amplifier (at 4J1-2 and 432-2) is 0.071 volt to the
frequency modulators of the receiver/modulator
units for a low frequency channel. Attenuator
4AT2 is connected between terminals 4XZ6-E and
4)4-5. The pads of this attenuator are connected
so that the output of receiving amplifier 4V6 (at
434-5) to the channelling equipment is ?20 dbm
per channel.
MAINTENANCE
General Notes
1. Replace electrolytic capacitors 4C1 and 4C2
once a year.
2. The tubes seldom need replacing. The circuits
employed allow the tubes to deteriorate appreciably
before a change in gain is noticeable. However
the gain of the unit should be checked as described
under Voltage Gaits Check at yearly intervals and
also if, after changing tubes, the gain of the ampli-
fiers is still outside the stated tolerance.
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Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
T.O. 31R5-4-A-21
3. Excessive intermodulation distortion can usu-
ally be remedied by replacing tubes. If this fails
---- to reduce the distortion, socket voltages and resistor
values should be checked.
Voltage Gain Check
To check the voltage gain of the baseband unit
use the following procedure. Before performing
' the check disconnect the cables from plugs 4.11,
4J2, 4J3, and 4J4. This removes the signal sources
from the unit and allows the system to remain in
operation while the measurements are being made.
Make sure that there is no system traffic through the
baseband unit before removing the plugs. Make
all audio voltage measurements with a Ballantine
Model 310A voltmeter (or equivalent) and use a
Hewlett Packard Type 200CD audio oscillator (or
equivalent) to generate the test tones.
Transmitting Amplifier
Baseband Input
. 1. Connect the audio voltmeter to 4J2-2.
(Load with 1000 ohms.)
2. Apply a 0.0184 volt, 100 kc tone to 4J4-1.
3. The meter reading at 4J2-2 should be
0.071 volt +1.0 db.
4. Connect the audio voltmeter to 4J1-2 and
repeat step 2.
B-3
5. The meter reading at 4J1-2 should be
0.071 volt +1.0 db.
Service Channel Input
1. Apply a 0.258 volt, 1000 cycle tone to
4J3-2. Load 4J4-1 with 135 ohms.
2. The meter , reading at 4J2-2 shOuld be
0.048 volt +0.5 db.
Receiving Amplifier
Baseband Output
1. Connect the audio voltmeter to 4j4-5.
(Load with 600 ohms.)
2. Apply a 0.028 volt, 100 kc tone alternately
to 4J1-5 and 4J2-5.
3. The meter reading at 4J4-5 should be
0.037 volt -?.1.0 db with the tone applied at either
4J1-5 or 4J2-5.
pi
NOTE: This figure applies for the stand-
ard level setting (4C12 connected to the
junction of 4R34 and 4R35). In systems
in which 4C12 is connected to the plates ofl
4V4 a meter reading of 0.074 volt ?1.0
db should be obtained.
Service Channel Output
1. Connect the audio voltmeter to 4J3-5 and
load with 22,000 ohms.
FROM
TERMINATION
P ANAL
EIJI -II- 2) 4 J4-
4AT I
(FROM PAD
CHANNELING
EQUIPMENT)
FROM SERVICE
CHANNEL UNIT
23J 3-2
OR 23J8-2
TO
TERMINATION
PA HAL
eui-(5-6)
(TO
CHANNELLING
EQUIPMENT)
TRANSMITTING AMPLIFIER
4 -2 4V3-4
2(6AW8)
TO SERVICE
CHANNEL UNIT
A. 23J35 4 J 3-
OR 23J8-5
4472
PAD
4VI
(6C136)
RECEIVING AMPLIFIER
4V6
16CL6)
4V5
(6CE16)
4V2
(6CL6)
?
2JI2-2
4V3-
AWB)
E
TO
RECEIVER/
MODUL ATORS
4J2-2 W -E
2JI2-2
4J1-5 2.112-5
4V4
(5965)
E-W
FROM ' 4
RECEIVER/
MODULATORS
4J2-50. W-E
2.112-5
8 -4 87410-0
Figure B-2?Baseband Unit?Block Diagram
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
Approved For Release 200019919 3fits9aM1049A002600030002-8
B-4
4939 4012 4R34 4010 409 4R50 4R52 4025 4R19 409 406 4017
4019 4013 4929 4926 4926 4022 4951 4983 4955 4954 4024 403 405
Figure B-3-Baseband Unit-Rear View, Dust Cover Removed
2. Apply a 0.019 volt, 1000 cycle tone alter-
nately to 4J1.5 and 4)2-5.
3. The meter reading at 4J3.5 should be
0.61 volt -? 1.0 db with the tone applied at either
4J15 or 4J2-5.
After completing the check remove the test equip-
ment and terminating resistors, and reconnect the
cables to plugs 4J1, 4J2, 4J3 and 4J4.
Frequency Response Check
To check the frequency response of the baseband
unit, follow the procedure described below. Before
performing the check make sure there is no system
traffic through the baseband unit. Disconnect the
cables from plugs 4J1, 4J2, 4J3, and 4J4. This
removes the signal sources from the unit and allows
the system to remain in operation while the
measurements are being made. Make all audio
voltage measurements with a Ballantine Model
310A audio voltmeter (or equivalent) and use a
Hewlett Packard Type 200 CD audio oscillator (or
equivalent) as the test tone source.
Transmitting Amplifier
Mamboed Input
1. Connect the audio voltmeter to 4J2-2.
(Load with 1000 ohms.)
2. Apply the test frequencies listed in step
#3 below to 4J4-1 through a 135 ohms series
resistor. Keep the oscillator output constant at 0.2
? volt measured at the oscillator terminals.
3. Measure the output at the test frequencies
at 4J2-2. With the 100 kc output as a 0 db refer-
ence the readings must be within the following
limits:
Frequency (kc) Nominal (db)
10 0.0
20 0.0
50 0.0
100 0.0
200 0.0
300 0.0
500 -0.2
600 1 -0.4
Tokrance (db)
?0.3
-?0.5
?-0.3
?-0.2
?:0.2
-?0.0
2:0.5
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Approved For Release 2000/R09 :341M4FA9261049A002600030002-8
.1errice Channel Input
I. Connect the audio voltmeter to Al2-2.
(Load with 1000 ohms.)
2. Apply the frequencies listed in step
below to .03-2. Keep the oscillator output con-
stant at 0.30 volt.
3. With the 1000 cycles input as 0 db reference
the readings must be within the following limits:
Frequency (cycles)
_
Nominal (db)
Tolerance (db)
300
-1.2
-.?_ 0.3
1000
0.0
?0.0
3000
-0.5
?0.2
Receiving Amplifier
Baseband Output
1. Connect the audio voltmeter to 4J4-5.
(Load with 135 ohms.)
2. Apply the set of test frequencies listed
below first to 4J1-5 and then to 4J2-5 and'ineasuee
the output at 4J4-5. Keep the oscillator output con-
stant at 0.20 volt at all frequencies. Make a separate
check for each test input (4J1-5 and 4J2-5). With
the 100 kc output as a 0 db reference the readings
must be within the following limits:
ll-5
Frequency ki Nominal (db)
0.1
Tolerance (?111)
1.0
0.3
0.3
0.5
1.0
0..1
0.5
3.0
0.2
0.5
5.0
0.0
.?0.3
10
0.0
? 0.2
20
0.0
?0.2
50
0.0
_L0.2
100
0.0
_L 0.0
200
0.0
_L-0.2
300
0.0
?0.2
500
-0.2
1:0.5
600
-0.5
-?0.5
Service Channel Output
1. Connect the audio voltmeter to 4J3-5.
(Load with 22,000 ohms.)
2. Apply the test frequencies listed in step
#3 below to 4J1-5: Keep the oscillator output con-
stant at 0.016 volt for all frequencies.
A Measure the output at the above frequen-
cies at 4J3-5. With the 1000 cycle output as a 0 db
reference the readings must be within the follow-
ing limits:
407
404
4014
4011
4R19
4R47
4020 4018
4R4
4R9 4R17 4R25 4R13 4R36 4R42 4R49 4R46 4016
Figure 8-4-Baseband Unit-Rear View, Dust Cover Removed
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B-6
.1110MILANIMOMMINIEMMO. AMU. ,Ignialalegraiigaial....a AIMS. oriralallialarillararo. .1111111. Arr. warrialarilervarar. arra roar...4
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
T.O. 31R5-44-21
Frequency (kc)
Nominal (db)
Tolerance (db)
0.1
-9.0
?1.0
0.3
-1.3
?0.3
0.5
-0.3
?0.3
1.0
0.0
-.?-0.0
2.0
-1.1
?0.3
3.0
-2.5 -
-1-.0.3
5.0
-5.5
-?0.6
10
-11.5
-?1.0
20
-20.0
--I.-..-2.0
40
-30.0
?5.0
After completing the check remove the test equip-
ment and terminating resistors and reconnect the
TYPICAL BASEBAND UNIT VOLTAGES
The following are typical voltages existing between individual tube pins and ground as measured with
an RCA Voltohmyst WV97A. All readings are dc unless otherwise specified.
Tube
Type
Pin
1
Pin
2
?Pio
3
Pin
4
Pin
5
Pin
6
Pin
7
Pin
8
Pin
9
4V1
6CB6
-0.55
0
6.0 ac
0
125
'32
0
?
?
4V2
6CL6
85
57
210 .
0
6.0 ac
210
210
210
57
4V3
6AW8
65
35
210
0
6.0 ac
1.1
0
42
170
4V4
5965
150
12
14.5
0
0
150
12
145
6.0 ac
4V5"-
6C116 -
. -0.55
0
6.0 ac
0
110
34
0
?
?
4V6
6CL6
70
52
180
0
6.0 ac
180
180
180
52 '
REPLACEMENT PARTS LIST
Symbol No.
Description
Drawing No.
Stock No.
4AT1, 4AT2
Resistor, attenuator, fixed, 0-15 db, in 1, 2, 4, and 8 db steps, ,
8914324-1
211642
4C1-A, B, C
Capacitor, dry electrolytic, 10/10/10 mf, 450/450/450 v.
449618-1
56304
4C2-A, B, C
'
4C3
Capacitor, fixed, mica, 150 mmf ..-4.:2%, 500 V.
737837-435
211643
4C4 `
Capacitor, fixed, paper, 0.47 mf -?10%, 200 v.
984611-137
4C5, 4C6
Capacitor, fixed, paper, 0.015 mf -?-10%, 400 V. ,,
735715-165
73797
4C7
Capacitor, fixed, paper, 1.0 mf ?-10%, 200 v.
984611-139
211741
4C8 to 4C10
Capacitor, fixed, paper, 0.01 mf J:10%, 400 v.
735715-163
73561
4C11
Capacitor, fixed, mica, 1200 mmf -?5%, 500 v.
727868-249
39654
4C12
Capacitor, fixed, paper, 0.015 mf ?-10%, 400 v. Same as 4C5
735715-165
73797
4C13
Capacitor, fixed, mica, 120 mmf ?296, 500 v.
737837-433
205529
4C14
'
Capacitor, fixed, paper, 0.47 mf -_1:10%, 200 v. Same as 4C4
984611-137
4C15
Capacitor, fixed, paper, 0.015 mf -?-10%, 400 v. Same as 4C5
735715-165
73797 .
4C16
Capacitor, fixed, paper, 4.0 mf 11:10%, 100 v.
8887706-3
211740
4C17
Capacitor, fixed, paper, 0.1 mf ?-10%, 400 v.
735715-175
73551
4C18
Capacitor, fixed, paper, 1.0 mf -?10%, 200 v. Same as 4C7
984611-139
211741
4C19
Capacitor, fixed, mica, 1200 mmf -.?5%, 500 v. Same as 4C11
727868-249
39654
4C20
Capacitor, fixed, mica, 470 mmf ?5%, 500 v.
737837-347
208960
4C21, 4C22
Capacitor, fixed, mica, 47 mmf -...4:5%, 500 v.
748252-323
95320
4C23
Capacitor, fixed, paper, 0.01 mf It 10%, 400v. Same as 4C8
735715-163
73561 ,
4C24
Capacitor, dry electrolytic, 10 mf, 50 v.
442901-51
52534
4C25
Capacitor, fixed, paper, 0.022 mf -?10%, 400 V.
735715-167
73562 ?
4J1, 4J2
Connector, male, 6 contact chassis mtg.
181494-3
28507 '
4J3, 4J4
Connector, female, 6 contact, chassis mtg.
181494-4
18534
4J5
Connector, male, 6 contact chassis mtg. Same as 4J1
181494-3
28507
4R1, 4R2
Resistor, fixed, composition, 2200 ohm ?-5%, V2 w-
735730-167
502222'
4R3
Resistor, fixed, composition, 100,000 ohm -?5%, V2 w.
735730-207
502410
4R4 '
Resistor, fixed, wire wound, 50 ohm -?5%, 5 w.
458572-15
210969
4R5, 41(6
Resistor, fixed, composition, 270 ohm -_+:5%, 11/2 w.
735730-145
502127
4R7 '
Resistor, fixed, composition, 4700 ohm 1:5%, 1/2 w
735730-175
502247
4R8
Resistor, fixed, composition, 1000 ohm -.1:10%, V2 w.
735730-62
502210
4R9
Resistor, fixed, composition, 56,000 ohm ?-5%, V2 IV.
735730-201
502356,
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A
Approved For Release 2000/08/29: CIA-RDP79T01049A002600030002-8
31R5-4-A-21
B-7
Symbol No.
Description
Drawing No.
Stock No.
4R10
Resistor, fixed, composition, 180,000 ohm -1:10%, 1/2 w.
735730-89
502418
41111
Resistor, fixed, composition, 56,000 ohm ?10%, 1 w.
90496-83
512356
41(12
Resistor, fixed, composition, 330,000 ohm ?109fi, 1/2 w.
735730-92
502433
4RI3, 41(I4
Resistor, fixed, composition, 1000 ohm i-10%, 1/2 w. Same as 41(8
735730-62
502210
4R15
Resistor, fixed, composition, 470,000 ohm .-_1:10%, 1/2 w.
735730-94
502447
4R16
Resistor, fixed, composition, 150 ohm -?-5%, V2 w?
735730-139
502115
4R17
Resistor, fixed, wire wound, 4000 ohm -?5%, 5 w.
458572-64
98600
41118
Resistor, fixed, composition, 330,000 ohm -?10%, 1/2 w. Same as 41(12
735730-92
502433
4R19
4R20
Resistor, fixed, composition, 2200 ohm -?-10%, 2 w.
.
Resistor, fixed, composition, 3900 ohm ?-596, 1/2 vv.
99126-66
735730-173
522222
502239
4R21 ?
Resistor, fixed, composition, 220 ohm ?-5% 1/2 w
735730-143
502122
4R22
Resistor, fixed, composition, 15,000 ohm 1;5% 1 w?
90496-187
512315
4R23
Resistor, fixed, composition, 470,000 ohm .?.10%, 1/2 w. Same as 41(15
735730-94
502447
4R24
Resistor, fixed, composition, 1000 ohm -?-10%, 1/2 w. Same as 4R8
735730-62
502210
4R25
Resistor, fixed, composition, 8200 ohm :?10%, 1 w.
90496-73
512282
4R26
Resistor, fixed, composition, 270,000 ohm -?10%, V2 w?
735730-91
502427
4R27
Resistor, fixed, composition, 1000 ohm ?10%, 1/2 w. Same as 4R9
735730-62
502210
4R28
Resistor, fixed, composition, 150 ohm :Li% 1/2 w? Same as 41(16 ? ? ? .
735730-139
502115
4R29
Resistor, fixed, composition, 1800 ohm ?-5%, 1/2 w?
735730-165
50248
4R30
Resistor, fixed, composition, 150 ohm -?-5%, 1/2 w. Same as 4R16 .. ?
735730-139
5021.15
4R3I
Resistor, fixed, composition, 1800 ohm ?-5%, 1/2 w. Same as 41(29
735730-165
502218
4R32
Resistor, fixed, composition, 1000 ohm ?-10%, V2 w. Same as 4R8
735730-62
502210
41(33
Resistor, fixed, composition, 270,000 ohm -?10/6, 1/2 w. Same as 41(26
735730-91
5024$7
4R34
Resistor, fixed, composition, 3900 ohm ?5%, 1 w.
90496-173
51239
4R35
Resistor, fixed, composition, 1800 ohm ?596, 1 w?
90496-165
512218
4R36
Resistor, fixed, composition, 1000 ohm -?,5%, 1 w?
90496-159
512210
4R37
Resistor, fixed, composition, 4700 ohm ?596, V2 w. Same as 4R7 ..
735730-175
5022,4 7
41(38
Resistor, fixed, composition, 1000 ohm z.1.-10,36, 1/2 w. Same as 41(8
735730-62
502210
41139
Resistor, fixed, composition, 220,000 ohm -?-10%, 1/2 w.
735730-90
502422
4R40
Resistor, fixed, composition, 56,000 ohm :1.11096, lw. Same as 4RII
90496-83
512356
4R41
Resistor, fixed, composition, 330,000 ohm -...4:1004, 1/2 w. Same as 41(I2
735730-92
502433
4R42, 41(43
Resistor, fixed, composition, 1000 ohm -?-10%, 1/2 w. Same as 4R8
735730-62
502210
41144
Resistor, fixed, composition, 68 ohm -?5%, V2 w.
735730-131
502068
41145
Resistor, fixed, composition, 470,000 ohm -1.-1096, 1/2 w. Same as 4105
735730-94
502447
4R46, 4R47
Resistor, fixed, wire wound, 2000 ohm -_1:5%, 5 w?
458572-58 _
48344
4R48
Resistor, fixed, composition, 130 ohm -1.-5%, 1/2 w?
735730-138
502113
4R49
Resistor, fixed, composition, 56,000 ohm -?5%, 11/2 w. Same as 4R9
735730-201
502356
41(50 to 41(52
Resistor, fixed, composition, 470,000 ohm ?-10%, 1/2 w. Same as 4R15
735730-94
502447
4R53
Resistor, fixed, composition, 1000 ohm -?-10%, V2 w. Same as 4R8
735730-62
502210
41(54
Resistor, fixed, composition, 270 ohm -.?5%, 1/2 w. Same as 4R5
735730-145
502127
41(55
Resistor, fixed, composition, 22,000 ohm -?5%, 1 w
90496-191
512322
4T1
Transformer, filament s
949385-1
94196
4X1
Socket, tube, 7 pin min, turret type
746949-9
211644
4X2, 4X3
Socket, tube, nova!, turret type
746949-4
205034
4X4
Socket, tube, nova!, turret type
746949-10
211645
4X5
Socket, tube, 7 pin min, turret type. Same as 4X1
746949-9
211644
4X6
Socket, tube, novel, turret type. Same as 4X2
746949-4
.205034
4X7, 4X8
Socket, capacitor, octal
746008-34
209911
4XZ1
Socket Assembly, not stocked complete, the following parts only
stocked, 4C3, 4C5, 4R5, 4R6, 4R7, 4R8, 41(10, 4R11, 41(I2, 4X1
641266-501
4XZ2
Socket Assembly, not stocked complete, the following parts only
stocked, 4C6, 41(9, 4RI4, 41(15, 4R16, 41(I7, 4X2
641266-502
4XZ3
Socket Assembly, not stocked complete, the following parts only
?
stocked, 4C8, 4C25, 41(I8, 4R20, 4R21, 4R22, 4R23, 4R24, 4R54,
41(55, 4X3
641266-503
4XZ4
Socket Assembly, not stocked complete, the following parts only
stocked, 4C9, 4C10, 4C23, 41(26, 4R27, 4R28, 41(29, 4R30, 4R31,
4R32, 41(33, 4X4 .
641266-504
- 4XZ5--- ' .
Socket Assembly, not stocked complete, the following parts only
stocked, 4C12, 4C13, 4C19, 4C20, 4R37, 41(38, 4R39, 41(40, 4R41, 4X5
641266-505
4X26
Socket Assembly, not stocked complete, the following parts only
'
stocked, 4C15, 4R43, 41144, 4R45, 4R46, 4R48, 41(49, 4X6 ..
641266-506
- -
AjmayedForRelease 2000/08/29: CIA-RDP79T01049A002600030002-8
T.O. 31R5-4-A-21
Description
Drawing No.
Stock No.
Miscellaneous
Base, tube shield (For 4V1, 4V5)
74694971
98907
?
Base, tube shield (For 4V2, 4V3, 4V4, 4V6) ,
746949-3
205036
Shield, tube, 7 pin min (For 4V1, 4V5)
99147-2
54521
?
Shield, tube, novel (For 4V4)
8888549-2
56359
Shield, tube, novel (For 4V2, 4V3, 4V6)
8888549-3
205035
Terminal, stand-off, melamine body, 27/32' lg., with #4-40 tapped
hole mtg. ..
8886187-1
211646
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030002-8
EW
RX/MoD
4J1 12 I
wE ' 4C9
?
RX/MoD
4412
4R2
2200
1-0.4CIG
SERV UNIT
-4L
4413
45 3
-
4c2,
? 44,8
4 R3
100K
TEPVA1NATION
to IT 4-ATI
4J4
--113
4AT2
CN1
co POWER
a
a 41.15 12 if 25ov
a
a 4311

CN1
cc
4AT I
6C56
4R9
Ae
? FIG K
8db
4c1I 4v I
4AT 4-4 1200 =1--.
UuF
4db
2db
idb
4C5 7 4-R8
.015 4 00 (000
4c5
4c4 ?
.47
ISO uuF
6CL6
6 AW8
4V3-A
4AT 2
.,4R5 4R64R10
1270 270 180K
4c9
4C23
.ot 4V4
4c2.-c.
4RI9
2200
2V?i
4C2-B
10
1
41R21 -0%204
220
NA.,--?
4R23
4R22
470K 4U. 34c2
MK .01 I
?IW
250V
5965
.01
4-R2G
270
4R29
1600
4J1-5
4J2-2
6 CB6
4v5
4R40
4J3-2
6 CL6
4-V6
4Cl2
.015
4C15
.015
9
4R35
moo 4R37
141 4700
l-A
4R38
1000
4R43 a
1000
4C16
4R48
3o
4010?
,01 ?
4R36
low
IW
4R39
220
413
4R47
2000 2_4C1-0
51,v. ?10
120 VU
4J2-5
4C19 4R 4 9
46?) 'NAN
12_00 UUP 56K
4f12.0
4-/0 U U F
4R50 4 R 51
470K 470K
4C21
47 U u
? 4-R52
47 IJUF
4C42T 470 K
4
4 R 53
)000
6AW8
4-V3-13
4 R55
22K
I W.
4R18
330K
4.1 4C24
1. I
?022
4C17
0,1
4R54-
?--A/Vv-?
270
4J 3-5
T.O. 31R5-4-A-21
B-9, B-10
0 ALL. RESISTOR VALUES GIVEN IN OHMS AND
ALL CAPACIToR VALVES GIVEN IN UF UNLESS
OTHERWISE sPECIFIED?
Figure B-5-Baseband Unit-Schematic Diagram
Approved For Release 2000/08/29 : CIA-RDP79T01049A002606030002-8
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600930002-8
--------------
ANTINNA
Ale
120
ail
Itra
4.02 050 VIM
2C2.. eL4
1500.7.
i L.. - -
-11V-411124- SI-SI
SERVICE 1 1.19
2.113 - 3041 6-4
Ail
..e.-10111,0
t< Ire: 16 NOtet
RECIMIS PluLT
6099 Or 14.4?4.
?C 01
POMO
2.111
230$ I
e 7110004101
AC M
It: 2025
..,15945
14T LE
4455
2V1
21.6
2LII
30o LE
6656
2V 3
21.
41'0 LE
6C56
2V4
21.21
2L 26
67i. LE
0.54
2V6
!CIS
220
2L12
21.25 2145
2C33
220
2C22 2157
as T
2C4Z IC.45
220 58
2L30
?'e 26131
5 1500
; 57 LIM 20o LM
GC166 6056
2V7 2,28
26105
1500
Von
/SO
2113
2.4
26102
1500
ICJO3
1500
2631
1500 2R100
2127 2200
2[130
220
56109
1500
ERSI
1900
2229
390
2C43
470
2R93
02-112
21495
i50 21296
102-111
2649 2C53
220 58
2134
5.4
26534
1500 2CR
2L75
5.6
12E543
22
OA 2
2V9
21430
590
26133
1000
26112
MOO
rc 145
4.7
4 3 ,
? I 2[113
21434 1500
390
26535
22104
560 2236
22?12
r
F
r 29
2068 ,c146
10)00 470
O0
-r
izci6o
how
o 0
T 22.4L73
2174
2.4
DRIVERS
22155
2700 26153
21.66 220
22149
47011
2
220
2Ft150.
471(
2 V19
6A145
,coo
DI 5C R IMINATcR
1121-?
I/2GAL5
2C154
1000 T
2C46.4
2215G
1500
2E29
2C121_
1000
52151
1000
1.8
CO
Cs11
2?,58
CD
CD
?
CO
26157 251
j_2215-
10K re6
2210
21.I4 20050
6.1 1500
26507
500
2L29
6.8
20 SO
000
21.46
1000 T,
2CI39
? 1000
2050
26157
1000
21.71 J 261631
T4:4;G1
2C165
4.5-28
1000
?
SC ISA
= 4 SI..
22127 2221
4701' = 0711
160%1
22137
1750-25W
22152
4702
2L27
6.8
26 54
2200
9
2C1515
206
it"Dia?
CLOUD or oll?.cpc.
cammoo
?
OR cm SM.
221
-r.--=D-121r.r.L"rt
C 152 ,
00
SAIlS
502-26 223
2c6e
.047
Ur
2225
100
SEE 140rre o
Sb AmPL
GUN.
LVIS
20194
1000
S.CH. AMPL
2082 I2AX7 2250
2700 2VIE. 1112.2w
SFE
2.2102 ions
100 .5 4.7
2255 2674
2202 1000 2[75
.IUF
5+-2. Ti
g4r.- rasa:- TT
1 14!>012
261 050
mown
. sat NoTte7
IS OUT 9
GROUI10
IS IN
2255
4702
214140
500K
22iis
too,, zci20
MW
22011
23 i2a.n
.1UF 1002 LOCKOim
STAMM,/
2C1
12AT"
z-4 21011
22121
25012
22114
562-06
2C110
200
12011
21915
iMED
.01U14
214115
27159 Itftm 22115 i211116
660 470K 3900 3500
_2019 IMIX2
Tato,' -.01UF
f---
26124
.0iNF
22123
22120
3900
6
2C125
1.04711F
21440
2711
2.15
DiScR
22125
2702
A-A,A&-