INSTRUCTION BOOK FOR RADIO STATION RS-6

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03561A000200060001-2
• Release Decision: RIPPUB
• Original Classification: R
• Document Page Count: 50
• Document Creation Date: December 23, 2016
• Document Release Date: August 6, 2013
• Sequence Number: 1
• Content Type: MISC

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_
INSTRUCTION BOOK
FOR -if el
RADIO STATION
RS-6
,
ILLEGIB
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TABLE OF CONTENTS
CHAPTER 1.
Section I.
Paragraph
INTRODUCTION
General
Page
Scope
1
1
Description
2
1
II.
Technical Characteristics
Transmitter RT-6
3
1
Receiver RR-6
4
1
Power Supply RP-6
5
1
Filter-Accessory Unit RA-6
6
1
Additional Accessories
7
3
CHAPTER 2.
OPERATING INSTRUCTIONS
Section I.
Setting up Equipment
AC operation hook-up
8
4
Battery operation hook-up
9
4
Hand generator operation hook-up
10
6
Battery charging hook-up and operation
11
6
II.
Transmitter RT-6
Controls and functions
12
8
Crystal selection
13
8
Antenna length and height
14
9
Ground connection
15
9
Tuning
16
9
Keying
17
10
III.
Receiver RR-6
Controls and functions
18
11
Calibrating the tuning dial
19
11
Tuning (variable)
20
11
Tuning (crystal)
21
12
Log scale
22
12
CHAPTER 3.
MAINTENANCE
Section I.
Receiver RR-6
Circuit description
23
13
Corrective maintenance of Receiver
24
13
BFO Panel Removal
25
17
Alignment
26
17
Dial scale mechanism?Disassembly and reassembly
27
23
II.
Transmitter RT-6
Circuit description
28
24
Corrective maintenance of Transmitter
29
26
Sending key adjustment
30
26
NI
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III.
Paragraph
Power Supply RP-6
Page
Circuit description
31
27
How to replace vibrator
32
28
How to replace power transformer
33
28
Corrective maintenance of Power Supply
34
28
IV.
Filter-Accessory Unit RA-6
Circuit description
35
29
How to disassemble
36
29
Corrective maintenance of Filter Unit
37
30
V.
Packaging
Units in plastic pouch
38
32
Units in cloth bag
39
32
CHAPTER 4.
REPLACEMENT PARTS LISTS
Section I.
Receiver RR-6
33
II.
Transmitter RT-6
38
III.
Power Supply RP-6
40
IV.
Filter-Accessory Unit RA-6
41
V.
Additional Accessories
42
APPempix I.
LOW RANGE OHMMETER
43
Iv
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LIST OF ILLUSTRATIONS
FIGURE TITLE
PAGE
1 Radio Station RS-6 Components
VI
2 Filter-Accessory Unit RA-6 Opened, Showing Accessories
2
3 Additional Accessories
2
4 Power Supply RP-6 Showing Control Switch and Power Plug
4
5 Radio Station RS-6 A-C Operation Hook-Up
5
6 Radio Station RS-6 Battery Operation Hook-Up
5
7 Radio Station RS-6 Hand Generator Operation Hook-Up
6
8 Radio Station RS-6 Battery Charging Hook-Up
7
9 Transmitter RT-6 Showing Control Locations
8
10 Filter-Accessory Unit RA-6 Showing RECVR-TRANS Switch
9
11 Receiver RR-6 Showing Control Locations
10
12 Receiver RR-6 Schematic Diagram
14
13 Point-to-Point Resistance Measurement on Rangeswitch18
14 Receiver RR-6 Top & Bottom View Showing Alignment Adjustment L'ocations
18
15 Receiver RR-6 Showing Panel Assembly Parts Locations
.20-21
16 Receiver RR-6 Top View Showing Parts Locations
22
17 Disassembly of Receiver RR-6 Dial Mechanism
22
18 Transmitter RT-6 Schematic Diagram
24
19 Transmitter RT-6 Parts Locations
25
20 Power Supply RP-6 Schematic Diagram
27
21 Power Supply RP-6 Vibrator Replacement
28
22 Power Supply RP-6 Parts Location
28
23 Filter-Accessory Unit RA-6 Schematic Diagram
31
24 Filter-Accessory Unit RA-6 Parts Location
31
25 Packaging Detail
32
26 Low Range Ohmmeter
43
V
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TRANSMITTER RT-6
190 150
230 :
270 95
POWER SUPPLY RP-6
RECEIVER RR-6
FILTER-ACCESSORY UNIT RA-6
Figure I. Radio Station RS-6 Components.
VI
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RESTRICTED
CHAPTER 1
INTRODUCTION
SECTION I. GENERAL
1. SCOPE
This instruction book contains a description,
the theory of operation, and instructions for main-
tenance and repair of Radio Station RS-6.
2. DESCRIPTION
Radio Station RS-6 is a compact four-unit set
3. TRANSMITTER RT-6
for transmitting CW and receiving CW or AM.
It operates from a-c, storage battery, or hand
generator, and consists of a Transmitter RT-6,
Receiver RR-6, Power Supply RP-6, and a Filter-
Accessory Unit RA-6, as shown in Figure 1.
SECTION II. TECHNICAL CHARACTERISTICS
a. Type: 2-stage, crystal-controlled
b. Frequency range (two bands):
(1) 3 to 7 me (megacycles)
(2) 7 to 16.5 mc
c. Power Output:
6-10 watts (depending upon frequency)
d. Power Input:
(1) Transmitting: 400-v de at 75 ma (mil-
liamperes). Idling during break-in: 400-v
de at 25 ma
(2) 6.3-v ac-dc at 1.2 amp (amperes)
e. Weight: 2 lb 14 oz
f. Dimensions (inches): 6% x 5 x 23,2
4. RECEIVER RR-6
a. Type: Superheterodyne, variable tuning or
crystal-controlled, fixed frequency
b. Frequency range (two bands):
(1) 3 to 6.5 mc
(2) 6.5 to 15 mc
c. Power Input:
(1) 90-v de at 15 ma regulated
(2) 90-v dc at 10 ma regulated
(3) 6.3-v ac-dc at 1.2 amp
d. Weight: 3 lb 2 oz
e. Dimensions (inches): 63% x 5 x 23.
5. POWER SUPPLY RP-6
a. Power Source: a-c line or 6-volt storage bat-
tery
b. Power Input:
(1) a-c 70 to 270 v, 40 to 400 cps (cycles per
second), 80 watts nominal
(2) d-c 6.3-v at 12 amp
c. Power Output:
(1) 6.3-v ac-dc at 2.4 amp
(2) 400-v de at 75 ma
(3) 90-v de at 25 ma regulated
(4) 90-v de at 25 ma regulated
d. Fuses:
(1) a-c-1.5 amp
(2) d-c-15 amp
e. Power Factor:
(1) 40 cps-60
(2) 60 cps-86.7
(3) 400 cps-96.3
f. Weight: 5 lb 11 oz
g. Dimensions (inches): 814 x 4 x
6. FILTER-ACCESSORY UNIT RA-6
a. Function:
(1) Filters B+
(2) Regulates receiver B +
(3) Switches B + to transmitter and to re-
ceiver
1
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BATTERY CABLE
ASSEMBLY
W-302
AC CABLE
ASSEMBLY-,
W-301
SCHEMATIC
DIAGRAMS
EARSET
RECEIVER
HS-30I
SPARE FUSE
F-301
2
BATTERY
CLAMPS
H-30I
COVER CATCH
RELEASE
SPARE FUSE
F-302
Figure 2. Filter-Accessory Unit RA-6 opened, showing accessories.
HANK ANTENNA
E-30I
Figure 3. Additional Accessories.
CORD
INTER-UNIT
W-304
ANTENNA
INSULATORS
E -302
EARSET
CORD
W-303
SOCKETS
(PROTECTIVE)
S 0-T
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(4) Provides storage space for accessories and
power cables. See Figure 2.
b. Weight: 3 lb 11 oz
c. Dimensions (inches) : 814 x 4 x 2
d. Accessories:
1 A-C cable assembly
1 Battery cable assembly
1 Spare fuse-1.5 amp
1 Spare fuse-15 amp
1 Set Schematic Diagram Cards
1 Earset and cord
7. ADDITIONAL ACCESSORIES
The following accessories are contained in a
plastic pouch (see Figure 3):
1 Hank antenna (100 ft)
2 Antenna insulators
2 Battery clamps
1 Inter-unit connecting cord with two leads to
connect sidetone and antenna from transmit-
ter to receiver
1 Incandescent lamp. Spare for E103
3
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CHAPTER 2
OPERATING INSTRUCTIONS
SECTION I. SETTING UP EQUIPMENT
8. AC OPERATION HOOK-UP
a. Turn the input voltage selector switch on
Power Supply RP-6 (Figure 4) to OFF.
b. Pull the sending key out of the recess on
Transmitter RT-6.
c. Connect the equipment as shown in Figure
5. (Receiver crystal shown is optional.)
(1) The Jones plug marked AC must be in-
serted in the OPERATE receptacle on Power
Supply RP-6 before the power plug is connected
to an a-c power source, otherwise "hot" terminals
will be exposed and a power line fuse may be
blown.
(2) Connect the two-prong plug of the a-c
cable assembly to any a-c power source whose
voltage is between 70 and 270 volts, and frequency
between 40 and 400 cycles per second. The two
prong a-c power plug can be adapted to various
receptacles in the following ways:
(a) Vary the spacing between the prongs
by compressing plug.
(b) Prongs can be unscrewed and reversed
to provide any combination of small and large
prongs as required to fit various power outlets.
d. Turn the input voltage selector switch on
Power Supply RP-6 clockwise to the first posi-
tion at which the neon indicating light glows.
The transmitter and receiver are now ready for
operation.
e. Do not turn off the equipment by discon-
necting the Jones plug marked AC. This would
expose "hot" terminals. Turn off the equipment
by pulling the power plug from the power source
or by rotating the input voltage selector switch
counterclockwise to the OFF position.
f. Refer to Sections II and III of this chapter
for detailed transmitter and receiver operating
instructions.
9. BATTERY OPERATION HOOK-UP
a. Turn the input voltage selector switch on
Power Supply RP-6 (Figure 4) to OFF.
4
COVER RETAINING SCREWS
AC INPUT VOLTAGE
SELECTOR SWITCH
S-20I
BATT. CHARGE SOCKET
SO-2
NEON INDICATING LIGHT
E-20I
OPERATE SOCKET
SO-1
COVER CATCH RELEASE
POWER PLUG,. SO-3
Figure 4. Power Supply RP-6 showing control
switch and power plug.
b. Pull the sending key out of the recess on
Transmitter RT-6.
c. Connect equipment as shown in Figure 6
(receiver crystal shown is optional).
(1) Use only a 6-volt storage battery source.
If only an 8- or 12-volt storage battery is avail-
able, connect across only 6 volts (3 cells) of the
battery. See Figure 6.
(2) The Jones plug marked BAT must be
inserted in the OPERATE receptacle on Power
Supply RP-6 before the battery clamps are con-
nected to the storage battery, otherwise "hot"
terminals will be exposed and equipment may be
damaged.
(3) Connect the red battery lead to the pos-
itive 6-volt terminal of the battery, and the black
battery lead to the negative terminal.
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AC CABLE ASSEMBLY
RP 6
TRANS. ANTENNA GROUND
RECEIVER ANTENNA LEAD
CRYSTAL (OPTIONAL)
USE ONLY WHEN CRYSTAL
CONTROL IS DESIRED
BATTERY CLAMP RED (+6V.)
RR-6
Figure 5. Radio Station RS-6, a-c operation hook-up.
TRANS. ANTENNA ..-GROUND
CRYSTAL
RT-6
EARSET
BATTERY CLAMP
CONNECT TO ONLY 6 V. (3 CELLS)
8 VOLT BATTERY (4 CELLS) SHOWN.
RECEIVER ANTENNA LEAD-.
CRYSTAL (OPTIONAL)
USE ONLY WHEN CRYSTAL
CONTROL IS DESIRED.
Figure 6. Radio Station RS-6, battery operation hook-up.
EARSET
5
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HAND GENERATOR ON 58
TRANS ANTENNA
RECEIVER ANTENNA
LEAD
ANT
CRYSTAL (OPTIONAL)
USE ONLY WHEN CRYSTAL
CONTROL IS DESIRED
RR-6
Figure 7. Radio Station RS-6,
NOTE: An alternate method of connection may
be necessary. If the battery is in a vehicle and
its positive terminal is grounded to the frame,
electrical contact between the frame and the case
of the RS-6 will cause a short, i.e., the battery
will discharge and the lead will overheat. To pre-
vent this, the black battery lead should be con-
nected to the battery terminal that connects to
the vehicle body frame, and the red battery lead
should be connected to the "hot" terminal of the
battery. When the black battery lead is connected
to the positive terminal, and the red battery lead
is connected to the negative terminal of the bat-
tery, the RS-6 cannot be used to charge the
battery; the fuse will burn out.
d. The transmitter and receiver are now ready
for operation.
e. Do not turn the equipment off by discon-
necting the Jones plug marked BAT. This would
expose "hot" terminals. Turn off equipment by
disconnecting the clamp from the positive or
"hot" battery terminal.
f. Refer to Sections II and III of this chapter
for detailed transmitter and receiver operation.
6
(0,
GROUND
RT-6
CRYSTAL
EARSET
hand generator operation hook-up.
10. HAND GENERATOR OPERATION HOOK-UP
a. Pull the sending key out of recess on Trans-
mitter RT-6.
b. Connect the equipment as shown in Figure
7. (Receiver crystal shown is optional.) Hand
Generator GN-58 should be used.
NOTE: Power Supply RP-6 is not used in this
method of operation. The transmitter and re-
ceiver are now ready for operation.
c. Refer to Sections II and III of this chapter
for detailed transmitter and receiver operating
instructions.
11. BATTERY CHARGING HOOK-UP AND
OPERATION
a. Only a 6-volt (3 cell) wet type storage bat-
tery can be charged with this apparatus.
(1) When the electrolyte in a lead-acid stor-
age battery has a specific gravity of 1.180, the
charging rate will be at least 3.5 amperes. When
the specific gravity of the electrolyte increases to
1.280 as the battery charges, the charging current
gradually drops .8 ampere.
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BATTERY CLAMP
BATTERY CLAMP
CONNECT TO ONLY 6 VOLTS (3 CELLS)
8 VOLT BATTERY (4 CELLS) SHOWN
BATTERY
GABLE
ASSEMBLY
AC CABLE
ASSEMBLY
POWER PLUG S0-3 MUST NOT BE CONNECTED
Figure 8. Radio Station RS-6 Battery Charging Hook-up.
(2) The battery should be charged only in
a well ventilated room as dangerous gases are
formed during the charging process.
b. It is desirable to keep the storage battery
as fully charged as possible. The RP-6, when
connected as a charger, should be used approxi-
mately 5 times as long as that period of time that
the RS-6 was operating from the battery power
source. A hydrometer is recommended to accu-
rately determine the charge of the battery.
c. Connect the equipment as follows: (See Fig-
ure 8).
(1) Turn the input voltage selector switch on
Power Supply RP-6 to OFF. (Figure 4)
(2) Disconnect Power Supply RP-6 power
plug from the Filter-Accessory Unit, RA-6, if it
is not already disconnected. This plug must be
disconnected to avoid blowing the fuse.
(3) Insert the Jones plug marked BAT in
the receptacle marked BATT-CHARGE.
(4) Connect the red battery lead to the pos-
itive 6-volt terminal of the storage battery.
(5) Connect the black battery lead to the
negative terminal of the storage battery.
(6) Insert the Jones plug marked AC in the
receptacle marked OPERATE.
(7) Connect the two-prong plug of the AC
cable assembly to any a-c power source whose
voltage is between 70 and 270 volts, and fre-
quency between 40 and 400 cps. The two-prong
a-c power plug can be adapted to various recep-
tacles in the following ways:
(a) The spacing between the prongs can
be varied by compressing the plug.
(b) The prongs can be unscrewed and re-
versed to provide any combination of small and
large prongs as required to fit various power
outlets.
d. Turn the input voltage selector switch of
Power Supply RP-6 clockwise to the first posi-
7
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J-IO2 CONNECTOR RELEASE
BUTTONS
'ANT. GND:
TERM. TERM.
ANTENNA IMPEDANCE MATCHING SWITCH
S-I03
ANT. OUTPUT INDICATOR
E-103
FINAL RANGESWITCH
S-I0 2
FINAL AMP NEON TUNING INDICATOR
E-102
HIGH SPEED KEYING JACK
J.- 101
CRYSTAL SOCKET
X-I01
PL-5
POWER PLUG
OSC. TUNING C-105
FINAL AMPLIFIER TUNING
C-I12
OSC. NEON TUNING INDICATOR
E- 101
Figure 9. Transmitter RT-6 showing control locations
tion at which the neon indicating light glows.
The battery is now being charged.
e. To stop the charging process proceed as
follows:
(1) Turn the input voltage selector switch
OSC. RANGESWITCH
S-I01
SENDING KEY
S-104
on the Power Supply RP-6 to OFF.
(2) Disconnect the two-prong a-e plug from
the power source.
(3) Remove the battery leads from the
battery.
SECTION II. TRANSMITTER RT-6
12. CONTROLS AND FUNCTIONS?(See Figure 9)
a. OSCILLATOR RANGESWITCH Selects
the desired band for the oscillator.
(1) Blue position 3 to 7 mc
(2) Red position 7 to 16.5 mc
b. FINAL RANGESWITCH Selects the de-
sired band for the final amplifier.
(1) Blue position 3 to 7 mc
(2) Red position 7 to 16.5 mc
c. OSCILLATOR TUNING Tunes the oscil-
lator tank to the desired frequency.
(1) Blue scale 3 to 7 mc
(2) Red scale 7 to 16.5 me
d. FINAL AMPLIFIER TUNING?Tunes
the final amplifier plate tank to the desired fre-
quency.
8
(1) Blue scale 3 to 7 me
(2) Red scale-7 to 16.5 me
e. ANTENNA IMPEDANCE MATCHING
SWITCH?Matches the output impedance of the
final amplifier to the antenna impedance.
f. SENDING KEY Used for hand-keying the
transmitter and for controlling the operation of
the transmitter with other methods of keying.
13. CRYSTAL SELECTION
a. Any desired frequency within the range of
the transmitter (3 to 16.5 mc) can be obtained
by selecting an appropriate crystal within the
range of 3 to 7 mc. This is accomplished by using
the fundamental (the frequency stamped on the
crystal), the second harmonic (two times funda-
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mental), or the third harmonic (three times funda-
mental) of the crystals.
b. DO NOT use overmode crystals, nor oper-
ate crystals on fourth or higher harmonics.
14. ANTENNA LENGTH AND HEIGHT
a. The length of the quarter wave "L" antenna
for a given frequency can be calculated from the
following formulas:
234
L (feet) ? freq (megacycles)
L (meters) = 0.238 x wavelength
b. The antenna should be as high as possible.
c. Connect the color coded lead of the short
twisted cord to the REC ANT post on the trans-
mitter and to the ANT TERM on the receiver.
15. GROUND CONNECTION
Connect the terminal marked GND to a metal
member buried in moist earth (water pipe, gas
pipe, or ground stake).
16. TUNING ? (Refer to Figure 9)
a. Plug a crystal into the socket marked CRYS-
TAL. Its fundamental operating frequency must
be either:
(1) The same as the desired transmitting
frequency (fundamental operation),
(2) One-half the desired transmitting fre-
quency (2nd harmonic operation), or
(3) One-third the desired transmitting fre-
quency (3rd harmonic operation).
b. Set the oscillator and final rangeswitches to
the desired band. Both switches must be set to
the same color.
(1) The blue position covers frequencies from
3 to 7 mc.
(2) The red position covers frequencies from
7 to 16.5 mc.
c. Set the oscillator and final amp tuning dials
as closely as possible to the desired transmitting
frequency. The dials are calibrated in megacycles
and both dials must be set to the same color scale.
The blue scale covers the same frequencies as are
covered by the blue position of the rangeswitch
and the red scale covers the frequencies covered
by the red position of the rangeswitch.
d. Set the RECVR-TRANS switch on the
Filter-Accessory Unit RA-6 to TRANS. See
COVER CATCH RELEASE
CONNECTING CORDS
HOUSED HERE
COVER RETAINING
SCREWS "A"
SO-5
\
TO
I \TRANSMITTER
PL-3
TO
POWER SUPPLY
S-301
RECVR- TRANS SWITCH
SO-6
TO
RECEIVER
Figure 10. Filter-Accessory Unit RA-6 showing
RECVR-TRANS switch.
Figure 10.
e. Turn the antenna impedance matching switch
to TUNE (zero). This disconnects the antenna
and reduces radiation to a minimum while tuning
up the transmitter.
f. Press the sending key and retune the final
amp tuning dial slightly to obtain a distinct in-
crease in brilliance of the FINAL TUNE FOR
MAX indicator. Release the key.
g. Press the sending key and retune the oscil-
lator tuning dial slightly to obtain a distinct in-
crease in brilliance of the OSC TUNE FOR MAX
indicator. If a pronounced brilliance peak is not
noted on the indicator (as may be the case when
using the third harmonic of a crystal) re-peak the
oscillator tuning dial for peak brilliance of the
FINAL TUNE FOR MAX indicator. Release
the key.
h. Press the sending key down and turn the
antenna impedance matching switch to that posi-
tion where the ANT ADJ MAX indicator glows
brightest. Release the key.
i. Press the sending key down and retune the
final amp tuning dial slightly for peak brilliance
of the ANT ADJ MAX indicator. Release the
key.
9
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17. KEYING
a. The transmitter is keyed:
(1) by the attached sending key (Figure 9).
A keying speed not exceeding 40 wpm (words per
minute) may be attained.
(2) by inserting a semi-automatic (bug) key
half-way into the KEY JACK (Figure 9) and
leaving the attached sending key out. A keying
speed not exceeding 40 Wpm may be attained.
(3) by completely inserting an automatic
tape keyer into the KEY JACK (Figure 9) and
leaving the attached sending key out. A keying
speed not exceeding 60 wpm may be attained.
b. Break-in operation is provided on the TRANS
position of the RECVR-TRANS switch. When
the attached sending key or the semi-automatic
(bug) key is released, the receiver will operate.
Automatic switching of the antenna from the
transmitter to the receiver is accomplished by
POWER PLUG
PL-6
the keying relay. The antenna signal is fed to the
receiver through the color coded lead in the
twisted cord connected between the ANT TERM
on the receiver and to the REC ANT post on the
transmitter. When the RECVR-TRANS switch
is in the RECVR position, it is necessary to con-
nect the antenna directly to the ANT TERM
on the receiver.
c. Sidetone for monitoring the transmitted sig-
nal is fed to the earset by the twisted cord lead
inserted in the MONITOR post on the transmitter
and clipped to the upper phones connector pin.
d. The transmitter is transmitting when the
attached sending key is folded into the recess on
the front panel. Therefore, the attached sending
key must be left out when using external keying.
e. Coding of the transmitted signal is possible
by inserting a frequency shift unit into the crystal
socket.
CONNECTOR RELEASE BUTTONS
ANT. TERM.
J-1
GND. TERM.
CRYSTAL CONTROL
SOCKET X?I
VOLUME CONTROL
LOG SCALES
PHONES CONNECTOR
J-2
VERNIER TUNING KNOB
TUNING DIAL
PRESS TO
CALIBRATE BUTTON
INDICATOR HAIRLINE
RANGE SWITCH
S?I
10
BFO CONTROL
CALIBRATION ADJUSTMENT KNOB
Figure I I . Receiver RR-6 showing control locations.
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SECTION III. RECEIVER RR-6
18. CONTROLS AND FUNCTIONS?(See Figure 11)
a. VOLUME?Controls volume of received sig-
nals.
b. RANGE?Selects proper frequency band.
(1) Blue position-3 to 6.5 mc
(2) Red position-6.5 to 15 mc
c. TUNING?Rapidly adjusts the oscillator
and r-f tuned circuits to any point within receiver
frequency range.
d. VERNIER TUNING?A finer control of
the large TUNING dial.
e. PRESS TO CALIBRATE?Provides crys-
tal-controlled frequency for dial calibration every
0.5 megacycle (500 kc).
f. ADJUST CALIBRATION?Corrects error
in dial calibration by moving the indicator hair-
line with respect to the dial scale.
g. BFO?Turns the 455 kc oscillator on and
off and varies the pitch of the audio signal
produced.
19. CALIBRATING THE TUNING DIAL
a. A signal generated by a crystal-controlled
oscillator in the receiver offers a means of check-
ing the accuracy of the frequency indicated on
the dial. By means of harmonics, the 500 kc
crystal provides signals in 500 kc steps through-
out the dial. Thus, each megacycle mark and each
half-megacycle mark become a calibration point.
To calibrate the dial, proceed as follows:
(1) Set the RECVR-TRANS switch (Figure
10) on Filter-Accessory Unit RA-6 to RECVR.
Although calibration can be accomplished with
the RECVR-TRANS switch in the TRANS posi-
tion, power consumption will be less with this
switch in the RECVR position.
(2) Turn the BFO dial until zero is aligned
with the white mark on the housing.
(3) Hold down the button marked PRESS
TO CALIBRATE.
(4) Turn VERNIER TUNING until zero
beat is heard, always tuning in from the low fre-
quency direction to eliminate any error due to
slack in the tuning system.
NOTE: Zero beat is the no sound point between
the two sound peaks. The VOLUME control
,should be set at the lowest gain setting sufficient
to hear the zero beat. Higher settings may make
it possible to hear spurious responses that will
result in an inaccurate calibration. A beat note
that sounds discordant may be an undesired
spurious response. Generally, a low gain setting
of the VOLUME control is sufficient at the lower
frequency settings of the dial. High frequency
settings of the dial usually require higher gain
settings of the VOLUME control to compensate
for the weaker harmonics of the 500 kc calibra-
tion crystal at those frequencies.
(5) Turn ADJUST CALIBRATION (Figure
11) until the hairline coincides with the calibra-
tion point on the dial scale.
b. When setting the receiver to a desired fre-
quency, first calibrate the tuning dial at the
closest calibration point.
20. TUNING (Variable)
a. The receiver will operate with the RECVR-
TRANS switch in the TRANS position when the
transmitter is not keyed. Automatic switching of
the antenna from the transmitter to the receiver
is accomplished by the keying relay when the
ANT TERM on the receiver is connected to the
REC ANT post on the transmitter. When the
RECVR-TRANS switch is in the RECVR posi-
tion, it is necessary to connect the antenna di-
rectly to ANT TERM on the receiver.
NOTE: Momentarily press the sending key down
after switching the RECVR-TRANS switch to
the RECVR position. Until the sending key cir-
cuit is closed, the transmitter will idle, as in the
case of break-in or key-up, when the RECVR-
TRANS switch is thrown to RECVR. This is
because the interval between the break and make
of the RECVR-TRANS switch is too short to
open the B supply link between the receiver and
the transmitter. Pressing the sending key down
will release the keying relay and remove B power
from the transmitter. This can also be accom-
plished by folding the transmitter key into the
recess on the side of the panel (only with RECVR-
TRANS switch set on RECVR). If this precau-
tion is not taken, unnecessary current drain from
the battery will reduce battery life.
b. Set RANGE switch (Figure 11) for the
proper frequency band:
(1) Blue?Low band: 3-6.5 mc
(2) Red?High band: 6.5-15 mc
.11
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c. The dial scale is calibrated directly in mega-
cycles. Use the blue scale for the low band and
the red scale for the high band.
d. First tune for stations with the TUNING
(coarse) control. For more precise adjustment use
VERNIER TUNING, always tuning in from the
low frequency direction to eliminate any error
from slack in the tuning system.
e. Calibrate the dial on the nearest megacycle
or half-megacycle calibration point as directed in
the previous paragraph. Turn BFO dial until zero
is aligned with the white mark on the housing
before calibrating dial.
NOTE: For a-m (voice) reception, turn BFO
clockwise to OFF.
f. Set the dial to the desired frequency and
then retune slightly, if necessary, for best re-
ception.
21. TUNING (Crystal)
a. Plug the specified crystal in CRYSTAL
CONTROL socket (Figure 11).
12
NOTE: The oscillator frequency is 455 kc higher
than the received frequency. The fundamental,
the second harmonic, or the third harmonic of a
crystal may be used.
b. Tune the receiver to the desired frequency
any proceed as above.
22. LOG SCALE
a. Signals may be accurately logged to three
figures through the use of the LOG SCALE.
(1) After a station is accurately tuned in,
note the position of the white horizontal line with
respect to the numerals 0, 1, or 2 located to the
left of the dial scale window. These numerals
represent the first digit of the log scale.
(2) Read and record the numeral located
immediately above the white horizontal line on
the window for the first digit. Read and record
the other two digits on LOG SCALE.
(3) Once a station is logged in, the tuning
dial may be re-set by these numbers for future
location of that station on the dial.
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Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
CHAPTER 3
MAINTENANCE
SECTION I. RECEIVER RR-6
23. CIRCUIT DESCRIPTION?(See Schematic, Fig-
ure 12)
a. Receiver RR-6 is an eight-tube superhetero-
dyne, two-band receiver. The incoming signal is
amplified by a 5899 tuned r-f stage (V1) and is
transformer coupled to the mixer grid. The trans-
former has both inductive and capacitive coup-
ling. The rangeswitch selects the desired antenna,
r-f, and oscillator coils. When the switch is in the
high band position the low band coils are shorted
out to prevent undesired absorptive coupling. The
5899 local oscillator (V2) normally is a tuned
plate type variable oscillator. It can be converted
to crystal control by inserting the crystal into
the socket (X1). A switch in the crystal socket
automatically makes the necessary circiiit changes.
When used with crystal control it becomes a
Pierce electron coupled type and the plate tank
tunes to the desired harmonic of the crystal.
b. Oscillator injection is accomplished induc-
tively by small coupling loops on the oscillator
and r-f transformer coil forms. Very loosely
coupled double-tuned i-f transformers (T7, T8,
and T9) operating at 455 kc are used; the pri-
maries of T8 and T9 are center-tapped to reduce
plate loading. This design results in a very narrow
band receiver. The mixer i-f transformer (T7)
primary tap is not used because of the need for
effective bypassing of the high frequency com-
ponents in the mixer plate circuit. Two i-f stages
(V4 and V5) are used, not so much to achieve
gain, but to obtain selectivity. Large unbypassed
cathode resistors (R13 and R18) are used in the
i-f stages in order to prevent regeneration.
c. Plate detection is used in the 2nd detector
(V6) in order to reduce loading of the 3rd i-f
transformer (T9) and thereby maintain utmost
selectivity. An i-f filter consisting of R23 (56K),
C39 (.001), and C40 (56uuf) is in the plate of the
2nd detector to prevent i-f energy from getting
into the audio amplifier. Capacitor C40, in con-
junction with C51, also controls the feedback for
the 500 Kc crystal calibrator.
d. By means of a capacity probe, the signal
from the Hartley BFO stage (V8, 5718) is in-
jected into the detector grid. This signal mixes
with the 455 kc i-f frequency and produces an
audio beat in the output of the second detector.
The audio beat is applied to the audio amplifier
(V7, 5718) and reaches the headphone. When the
BFO is turned off, C49 is shorted out and the
frequency of the tank is lowered to approximately
400 kc, which is far enough away in frequency
to be rejected by the i-f amplifier. Any signal
which does get to the detector produces a beat
outside the audio range. With the BFO "off" the
receiver can receive a-m signals. The frequency
of the BFO is changed rather than turned off in
order to provide the negative d-c voltage required
by the volume control. A germanium crystal de-
tector (CR1) in the BFO stage rectifies part of
the oscillator tank voltage. This rectified voltage
is applied as fixed bias to the detector, V6, and
is also applied to the VOLUME control, R28, to
control the bias of the r-f and i-f stages.
e. The audio output stage, V7, is also usea as
a 500 kc, crystal-controlled oscillator to provide
an accurate signal for checking the calibration of
the dial. Sufficient harmonics are generated to
provide 500 kc check points throughout the two
bands. The stage is converted to a Pierce-type
oscillator by the PRESS TO CALIBRATE but-
ton, which connects the crystal (Y2) between the
grid and plate. The signal is fed back to the r-f-
amplifier control grid by a capacity probe.
24. CORRECTIVE MAINTENANCE OF RECEIVER
a. Determine precisely the cause and location
of the fault before attempting the substitution
of parts. Changing parts may create new diffi-
culties. Successful repair is difficult because the
RR-6 receiver is compact and complex. The gen-
eral method of analysis is first to determine the
faulty section and then locate the defective com-
ponent within that section. A trouble-shooting
chart is supplied as an aid in locating trouble.
13
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L Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
CCAPACITY PROBE TO INCREASE RADIATION OF THE CAUBRATING CRYSTAL
Ji
GAD ANT /
C9AJZ
LF [1.8 rOITSWA
OR I VI
MF HF
SW) 5 2 0 S112)
R2
650 WA TEL
1111.6
LvDOT
YEL
2
711
.0,1.1_199
4 POSK$ TIE
GR
1
XTAL
VI
5899
RF
SI -0.58 V
4
#152V
44%
.710
R6 ,
120* -01
101
R7
156
TI 12, T3. 14
VS a as
CONNECTIONS
COLOR
If
6 2
5 3
ommLiiIII-1 Cs
.001 IcIL.
144-1
DIAL
POSITION #
47
CI
6
RI
56K
V2X"
sass r
050
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- .9 V HI
(4.7317,101.1d
ASK
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100
jkl? F BUJ 1A"
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WH
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-/.9 V HI
N Ar
6/ TArlo
C9C 5.2 OLE
BLU DOT
LFi111 627
LF
100
?
V3
5899
MIXER
#411V
C30
MFG:74 22T
S1(5) A 5 2
13 11--
R6
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715
RED DOTI
C2A 2
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I:7 Ti, TII T10KCOaCIC&
41111
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???
(3) (5)
JKLM R TU
9 ou0 o ow*I0011
o o IT!! ogalani o o
EFGH NOPO VWXY
(2)
4-BR
Si CONNECTIONS
(SWITCH SHOWN IN LF POSITION)
BLK
START
050
100
BFO & BIAS SUPPLY
VB
#
IWO 680054 5718
? 8 R29162
F.47RJ-a.1080 .f NF
.21-C441
C4
TAP
L2 stsoaritsal
I. .1_I VAR
1. CAP
1.
0111?41.111-0
laCAPACITY PROBE FOR BFO INJECTION INTO 2ND DET
6
4-#701, 10K
VS
5718
DET
#90V
561(
R23
.001 MF 56
5
4"3
R32
c*I5V BLU,
R28 BRNa
IMEG
VOL
CONT
PL6
VT
.011 IE1F
C4I
5718
TIO AUDIO 12
XTAL 52
BLU 0
11440j2NYESEL #91V
14(-4-111CjI
7.4eALIBR:ITE
624366 PRTEIS
RED'S
?-.A.84V
-0-RED
aYEL
-12
if
.01 MF
54 -3 TO-4.5V.
J 120A NOTE:- PL6 VIEWED
FROM FRONT.
2F"1/4
NOTE:-
ALL CAPACITORS ARE IN MMF UNLESS
OTHERWISE INDICATED.
VOLTAGE READINGS TAKEN WITH VOLTOHMYST BETWEEN
POINT WDICATED AND CHASSIS WITH VOL CONT AT MAX
IWO AT ZERO, AND NO SIGNAL INPUT.
NOTE RESISTORS ARE IN OHMS UNLESS OTHERWISE SPECIFIED.
Figure 12. Receiver RR-6 schematic diagram.
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This chart lists symptoms which the serviceman
may observe while making a few tests. The symp-
toms noted will determine what further steps are
to be taken. The particular stage or circuit that
may be defective is indicated in the second col-
umn. Voltage and resistance measurements of the
defective circuit should ordinarily be sufficient to
isolate defective components not specifically men-
tioned.
RECEIVER RR-6 TROUBLE-SHOOTING CHART
SYMPTOM
PROBABLE CAUSE
REMEDY
Too much variation in gain across band.
Mistracking.
Realign.
Mistracking due to bent plates in antenna
Replace variable capacitor and
or r-f sections of variable capacitor.
realign.
Insufficient oscillator injection in mixer
at low end of band.
Replace oscillator tube.
Insufficient injection due to open link cir-
Replace or repair oscillator coil
cuit.
or mixer coil.
500 Kc crystal calibrator inoperative.
Defective crystal.
Replace.
Defective switch.
Replace.
No calibration beats at upper end of high
band.
Weak crystal.
Replace.
Open feedback capacitor C40 or C51.
Replace.
Spurious beats 45 kc above or below cor-
rect beat when using crystal calibrator.
Open capacitor C39.
Replace.
Volume control set for too much receiver
gain.
Reduce volume control setting.
Beat note produced on calibration check
Volume control set for too much receiver
Reduce volume control setting.
sounds broken up and does not change
pitch with tuning of variable capacitor.
gain.
Low sensitivity.
'Low i-f gain.
Realign i-f transformers.
Replace i-f tubes.
Low r-f gain.
Realign antenna and r-f coils.
Replace r-f tube.
Insufficient oscillator injection in mixer.
Replace oscillator tube.
Open oscillator injection link (usually bro-
ken at coil terminal).
Repair or replace coil.
Low detector gain.
Change tube.
Too high fixed bias on detector.
Repair bfo.
Open r-f or i-f bypass: C32 or C12.
Replace.
Open antenna coil.
Replace or repair.
Audio output low.
Excessive bias on detector. Should be ?3
to ?4.5 volts.
Repair bfo.
15
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Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
RECEIVER RR-6 TROUBLE-SHOOTING CHART (Cont.)
SYMPTOM
PROBABLE CAUSE
REMEDY
High noise output.
I-f amplifier cathode resistor shorted to
ground.
Remove short.
Gain control not effective on strong sig-
Short to ground at i-f transformer grid
Remove short.
nals.
return lug.
.
Shorted bypass capacitor C32, C35, or
Replace.
C12.
Bfo not operating or operating weakly.
Repair bfo.
Bfo signal not rectified.
Replace crystal CR1.
Dial calibration incorrect.
Improper oscillator alignment.
Realign receiver.
Bent oscillator plates in variable capac-
itor.
Replace gang.
No beat heard on cw signal.
Bfo coil improperly aligned.
Align bfo coil.
Bfo trimmer shorted.
Remove short.
Squeal heard on a-m signal reception.
Bfo trimmer not shorting because stop is
bent or broken.
Replace bfo trimmer.
Fine tuning mechanism binds when rotat-
Rubber idler shaft in fine tuning mecha-
Remove assembly and adjust.
ing large dial by hand.
nism improperly aligned.
Screw holding fine tuning bracket and
earphone jack to post loose.
Tighten screw.
Pivot bolt on fine tuning assembly too
Take out looseness by tightening
loose.
nut.
No B ? voltage.
Broken lead in plug.
Repair.
No filament voltage.
Broken lead in plug.
Repair.
B ? much higher than 105 volts.
Defective voltage regulator tube in filter
Replace.
b. Use of the Signal Input Chart will make it audio oscillator such as a Hewlitt Packard Model
possible to locate the defective section to correct 200C.
a set having low over-all gain.
c. Low over-all gain could be the result of
trouble in any of the following sections: the audio
amplifier, the detector, the i-f or r-f amplifiers or
the antenna coil. The first step is to measure the
sensitivity of the receiver at the various stages
starting with the antenna input and proceeding
toward the audio output stage. By consulting the
Signal Input Chart, the nominal input at each
grid is known for 5 mw of audio output. A .01 uf
capacitor should be connected in series with the
hot lead of the signal generator so as not to upset
the bias at the test signal input points. The gain
of the audio stage can be measured best with an
16
SIGNAL INPUT CHART
Signal generator
output connection
Frequency
400 cps 30%
modulation
Signal
generator
output (uv)
Antenna terminal through
3.0 mc
10
a 270 ohm resistor.
9.0 mc
10
RF grid, pin 1, Vi.
3.0 me
19
9.0 mc
19
Mixer grid, pin 1, V3.
455 kc
65
1st i-f grid, pin 1, V4.
455 kc
15,300
2nd i-f grid, pin 1, V5.
455 kc
170,000
Det grid, pin 1, V6.
455 kc
1,000,000
Det grid, pin 1, V6.
400 cycles
200,000
Audio grid, pin 1, V7.
400 cycles
800,000
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d. The conversion gain of the mixer stage may
be low due to insufficient oscillator injection volt-
age. With the oscillator grid, pin 1 of V2, shorted
to ground, measure the ? contact potential at the
grid, pin 1 of the mixer tube, V3, using the d-c
probe of a vacuum tube voltmeter. The residual
contact potential usually measures from .5 to .8
volt. Remove the short from the oscillator and
observe the rise of potential on the mixer grid.
The oscillator injection voltage should result in
a rise of .5 volt or more above the residual con-
tact potential. Any value less than this indicates
insufficient injection of the oscillator signal.
e. Low gain in the antenna or r-f stage will
result in low receiver sensitivity. To check an-
tenna and r-f gain, remove the oscillator injection
voltage to the mixer by shorting the grid, pin 1,
of the oscillator tube, V2, to ground. Place the
d-c probe of a vacuum tube voltmeter on the
grid, pin 1, of V3. Set the volume control at the
maximum position. Use a 470K ohm resistor in
series with the probe to avoid detuning the grid
circuit. The voltage measured at the grid of V3
will be the residual contact potential and will be
approximately .5 to .8 volt. Connect the output
of a signal generator (GR-805C) to the antenna
terminal through a 270 ohm resistor. The An-
tenna and RF stage gain chart lists the input
voltage necessary to produce a rise of .5 volt over
the residual contact potential at the mixer grid.
ANTENNA AND R-F STAGE GAIN CHART
Band
Fre-
quency
(me)
Signal generator
output connection
Signal generator
output (uv)
(for increase of
.5V at mixer grid)
Low
High
3.5
6.0
7.0
15.0
Antenna terminal through
270 ohm resistor.
Antenna terminal through
270 ohm resistor.
Antenna terminal through
270 ohm resistor.
Antenna terminal through
270 ohm resistor.
20,000-35,000
30,000-60,000
20,000-35,000
30,000-60,000
Low
High
3.5
6.0
7.0
15.0
RF grid through 10,000
uuf capacitor.
RF grid through 10,000
uuf capacitor.
RF grid through 10,000
uuf capacitor.
RF grid through 10,000
uuf capacitor.
39,000-70,000
50,000-120,000
30,000-70,000
50,000-120,000
f. A diagram of point-to-point resistance meas-
urements on the r-f rangeswitch is provided to
locate defective coils easily. See figure 13. It is
advisable to obtain an ohmmeter capable of accu-
rate readings down to .01 ohm such as the Weston
Model 301. If such a meter is not obtainable, a
suitable low range ohmmeter can be constructed
and calibrated as shown in figure 26.
25. BFO PANEL REMOVAL
To facilitate testing and circuit checking, the
wires connected to the BFO panel are long enough
to permit removal of the panel without interrupt-
ing circuit operation. The only wire which must
be disconnected is the blue wire which serves as
the capacity probe for BFO injection into the
second detector. The excess wire is folded over
the top of the panel and secured with a clamp.
To remove the BFO panel, remove the six retain-
ing screws, release the clamp holding the excess
wires and lift out the panel.
26. ALIGNMENT
a. Equipment Required
(1) AM signal generator having:
(a) frequency coverage from 455 Kc to 16
mc.
(b) accurately calibrated, adjustable out-
put.
(c) 400 cycle, 30% modulation.
(2) Output power meter, GR type 583?A or
equivalent.
(3) Non-metallic screwdriver with wi blade
(for i-f transformers).
(4) Small size screwdriver to fit antenna, r-f,
and oscillator transformers.
(5) Medium size screwdriver with blade
ground to fit trimmer slots without play. Blade
should not ride in bottom of slot.
b. Procedure
(1) Connect the equipment, as directed in
Chapter 2, Section I (do not connect phone when
the output meter is used, as the output load im-
pedance will be reduced by one-half).
(2) Set RECVR-TRANS switch on Filter-
Accessory Unit RA-6 to RECVR.
(3) Expose bottom alignment adjustments as
follows (see Figure 14):
(a) i-f?slide cover plate to right.
(b) bfo?turn cover plate counterclockwise.
(c) r-f?remove two screws and cover plate.
17
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CAPACITY PROBE FROM
CALIBRATING CRYSTAL
1.78 1.78
_
70 K
1 10K .067
.296
-6.7-
TAP ON HF OSC COIL AT COIL
TERMINAL OR PA DDER TERMINAL.
13.3 4-LF SWITCH POSITION
?0---
4-HF SWITCH POSITION
w 470 K
VOLUME CONTROL AT
MAX GAIN POSITION
ANT
GNI).
10K
TOP VIEW
NOTES:
I. RANGE SWITCH IN LF
POSITION UNLESS OTHERWISE
SPECIFIED.
2. RESISTANCE READINGS ARE
NOMINAL VALUES.
Figure 13. Point-to-point Resistance Measurements on Rangeswitch.
PHONES
CONNECTION
VOLUME
CONTROL
R-28
RANGE
SWITCH
S- I
18
T-7
(PR I.)
PRESS TO
CALIBRATE
BUTTON
BFO
CONTROL
T-I
1-6
T-5
T-4
B FO
COVER
PLATE
T-3
L-2
IF
COVER
PLATE
T-9
(SEC.)
1-8
(SEC.)
Figure 14. Receiver RR-6, top and bottom views showing alignment adjustment locations.
T-7
(SEG.)
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(4) Connect the output meter across the
phones terminals J2. Set the "OHMS" knob to
40 and the impedance multiplier to 100. Set the
meter multiplier to 1.
NOTE: Throughout the alignment procedure, re-
duce the generator output to a level which pro-
duces about 5 mw output indication on the out-
put meter. This will avoid overloading the
receiver.
(5) Remove the top cover and turn VOL-
UME control to maximum volume.
(6) Refer to Figure 14 for adjustment loca-
tions.
(7) Remove glyptal from the cores and trim-
mers in the r-f section with lacquer thinner or
acetone. If thinner doesn't loosen the core suffi-
ciently, apply the heat from a soldering iron.
c. IF Alignment
(1) Connect the AM generator to the grid
of the mixer (pin 1, V3?See Figure 15?RF panel
front view) and set it to 455 kc with 400 cycle,
30% modulation. Detune the receiver to remove
unwanted signals.
(2) Set the generator output high enough to
give about 5 mw output on the meter.
(3) Tune the primaries and secondaries of
T9, T8, and T7 for maximum output on meter.
(See Figure 14).
(4) The i-f sensitivity is normal if a gener-
ator output of 100 microvolts or less produces 5
mw output.
d. BFO Alignment
(1) With the equipment connected as above,
turn off generator modulation, and set the BFO
dial to zero. (The zero on the dial should be at
three o'clock when viewed as in Figure 14.)
(2) Adjust the bfo coil (L2) for zero beat.
(3) After alignment of the bfo, apply glyptal
to the adjustment screw.
e. RF Alignment
(1) Replace the top cover which was removed
during i-f alignment, and place the receiver on
its side.
(2) Connect the generator to the ANT-GND
terminals (J1). Use a 270 ohm carbon resistor
(dummy antenna) in series with the antenna
terminal.
NOTE: This value is for a 30-ohm generator. If
generator output impedance is other than 30 ohms,
subtract the generator impedance from 300 ohms
for the correct value of dummy antenna.
(3) Turn BFO dial to OFF.
(4) Set low-band trimmers C10, C16, and
Cz26 so that screwdriver slots are parallel to the
long edge of the compartment. This represents
the mid-capacity positions.
(5) Turn the TUNING dial clockwise until
it reaches the end stop (low frequency end). Then
turn the VERNIER counterclockwise slightly to
take up any slack in the drive.
(6) Turn ADJUST CALIBRATION knob
until the hairline passes through the center of
the circle at the bottom of the dial window.
(7) Set the generator frequency to 3.5 mc
and the generator output to 100 microvolts with
400 cycle, 30% modulation.
(8) Set RANGE switch to "blue" position
(3 to 6.5 mc).
(9) Set the receiver tuning dial at 3.5 mc.
(10) Tune the oscillator slug in T5 for maxi-
mum output on the meter.
CAUTION: Do not turn the slug too far into the
coil; when turning becomes difficult, do not force,
as damage to the terminal assembly may result.
NOTE: For final adjustment of the slug, reduce
the generator output until a receiver output of 5
mw is obtained.
(11) Tune the slugs in Ti (antenna), T3
(r-f) and T5 (oscillator) for maximum output.
(12) Set the receiver and generator dials for
alignment at 6.0 mc.
CAUTION: There will be two generator frequencies
which will produce an output indication. One will
be near the frequency setting of the receiver and
the other, the image frequency, will be 0.91 mc
higher. The lower one is the correct alignment
frequency.
(13) Adjust the oscillator trimmer (C16) and
antenna trimmer (C10) for maximum output. Do
not adjust Ti, T3, or T5.
(14) Since the r-f trimmer (C26) has some
pulling effect on the oscillator, it will be necessary
to find the true resonant frequency of the r-f
tank by a "rocking" procedure as follows:
(a) Note the output reading on meter.
(b) Turn the r-f trimmer (C26) slightly
counterclockwise until the output drops approxi-
mately one-third to one-half.
(c) Readjust the oscillator trimmer (C16)
for maximum output.
(d) If the maximum reading is higher than
that in step (a), repeat steps (a), (b), and (c),
until the highest output is obtained. Lower the
19
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
R-F PANEL
ASSEM
FRONT VIEW
1ST I-F AMP
PANEL ASSEM
FRONT VIEW
DETECTOR
a
AUDIO PANEL
AS
20
J -1 R-28 C-7 L-I R-9 R-5
R-2
X-I
V-1 V-2 V-3
R -F OSC MIXER
5899 R-7 R-3 R-I C-I 5899 R-4 5899
V-4
1ST I-F AMP
5899
R-I4
V-7
S-2 R-32 AUDIO AMP
5718
R-I3
C-33 8-16
R-27
R- 15
R-23 C-5I
C-43
R-25
1ST I-F AMP
PANEL ASSEM
REAR VIEW
FRONT VIEW
R-26
C-39
C-4I
REAR VIEW
C-40
Figure 15. Receiver RR-6, sli
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Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
C-32
C -22
2ND I-F AMP
PANEL ASSEM
FRONT VIEW
>I assembly parts locations.
R-1 2
C-3
V -5
2ND I -F AMP
5899
C-46 CR-I
C-I5
R-20
R-19
V-8
BFO
5718
C-53
C 50
L-2
C-52
R-30
R-34
TOP
R-29
C-49
C-I4
X-1
C-37
R-3I
C-47
C-49
L-2
BOTTOM
R-F PANEL ASSEM
REAR VIEW
2ND I -F AMP
PANEL ASSEM
REAR VIEW
C45 BFO
PANEL
ASSEM
C-44
TOP
a
BOTTOM
C-48 VIEW
R 33
21
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Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
PL-6 *RF PANEL -2 T 1 C-I0 C-8 C-27 R-I1 C-9
ASSEMBLY
J-I
S-I
C-I1
R-28
X-I
T-6
C-I6
J-2
V-I
RF AMP
5899
1-5
L-I
1-6
Y-2
V-6 (BOTTOM)
DETECTOR
5718
*DETECTOR
AND AUDIO PANEL
ASSEMBLY
V-2
OSC
5899
T-4
C-26
V-7 (TOP)
AUDIO AMP
5718
S-2
BFO PANEL
ASSEMBLY
V-3
MIXER
5899
C-23
C-29
T-7
*1ST IF V-4
PANEL ST IF AMP
ASSEMBLY 5899
V-5 *2ND IF
2ND IF AMP PANEL
T-3 C-24 C-25 T-8 5899 ASSEMBLY
xSEE FIGURE 14 FOR LOCATION OF PARTS ON PANELS.
Figure 16. Receiver RR-6, top views showing parts locations.
Figure 17. Disassembly of Receiver RR-6 dial mechanism.
22
T-9
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Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
generator output as required to keep the output
around 5 mw.
(e) If in step (d) the maximum reading is
lower than that in step (a), it indicates that the
r-f resonance has been passed. In this case, repeat
steps (a), (b), (c), and (d), turning r-f trimmer
(C26) clockwise instead of counterclockwise.
(15) After the true r-f resonance has been
found, recheck the alignment of Ti, T3, and T5
at 3.5 mc.
(16) If it was necessary to move any of the
slugs (Ti, T3, or T5) while rechecking the align-
ment at the low alignment point on the dial (3.5
mc), recheck the alignment at the high alignment
point on the dial (6.0 mc).
NOTE: Because of the extreme accuracy desired
in this receiver, it is well to recheck the align-
ment at both the low and high alignment points
on the dial three times. After the first alignment
the r-f resonance should be close enough to the
true resonance so that only the oscillator trimmer
and slug need be re-adjusted.
(17) After the low band has been accurately
aligned, apply glyptal to the low-band trimmers
and slugs.
(18) Set RANGE switch to "red' position
(6.5-15 mc).
(19) Set the receiver and generator dials at
7.0 mc.
CAUTION: Check for image frequency as in step 12.
(20) Turn trimmers C11, C17, and C29 so
that the slots are parallel to the long edge of the
compartment.
(21) Tune oscillator slug in T6 for maximum
output.
CAUTION: Do not force slug into the coil.
(22) Tune T2, T4, and T6 slugs for maxi-
mum output.
(23) Set the generator and receiver dials at
14.5 mc.
(24) Adjust the oscillator trimmer (C17) and
antenna trimmer (C11) for maximum output.
(25) Repeat the "rocking" procedure as de-
scribed for the 3 to 6.5 me band in step 14 to
find the true resonant frequency of the r-f tank.
In this case, however, adjust the r-f trimmer C29,
and oscillator trimmer C17.
(26) Repeat the alignment at both the low
and high alignment points on the dial three times.
(27) Replace glyptal on trimmers and slugs.
(28) The set when properly aligned will have
a sensitivity on both bands of less than 20 micro-
volts for 5 milliwatts output.
f. Alignmeht by Crystal
(1) The receiver may be aligned in the field
by replacing the a-m signal generator with the
radiated signal from the calibrating crystal and
by using the phone as an output indicator. The
alignment procedure is the same as with the gen-
erator except that the bfo is turned on. The gain
of the receiver must be reduced sufficiently after
the beat is located to permit hearing a change of
volume when the adjustments are made.
(2) If aligned on the image, the dial calibra-
tion will be off and large sensitivity variations
will be noticed over the band. Aligning on an
image or wrong harmonic of the crystal will result
in an abnormal position of the coil slugs and
trimmers. The slugs normally extend W to 34'
beyond the end of the coil base. The slots in the
trimmers are normally less than perpendicular to
the long edge of the compartment. A slot per-
pendicular to the long edge would very likely
indicate that the set is misaligned.
27. DIAL SCALE MECHANISM?DISASSEMBLY
AND REASSEMBLY ? (Refer to Figure 17)
a. DISASSEMBLY
(1) Lift the frequency channel indicator (B)
up at the large end, and slide out of spring
clamp (D).
(2) Remove the screws (J) and remove the
assembly consisting of (A), (C), (D), and (L).
(3) Remove the three screws (K).
(4) Push the vernier (E) in the direction
indicated until it clears the dial. Hold it in posi-
tion until the dial scale has been removed.
(5) Remove the dial by lifting straight up,
because it fits snugly on hub.
b. REASSEMBLY
(1) Replace dial, placing pin in hole (F).
(2) Replace screws (K).
(3) Replace the assembly consisting of (A),
(C), (D), and (L) and screws (J).
(4) Turn the dial until the tuning capacitor
is fully meshed.
(5) Hold spring (A) back and insert the end
of frequency channel indicator (B) into spring
clamp (D) until the white line (G) falls over the
line between the top two scales on dial.
(6) Engage the pinion gear (H) with the rack
gear teeth on rear of frequency channel indi-
cator (B).
(7) Make sure the end loop on spring (A)
rests on top of frequency channel indicator (B).
23
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
SECTION II. TRANSMITTER RT-6
28. CIRCUIT DESCRIPTION?(See Schematic, Figure
18)
a. Transmitter RT-6 is a two-stage, crystal-
controlled, CW transmitter. It has two bands
with variable capacitors that provide oscillator
and final tuning.
b. A keying relay is employed in the RT-6 to
switch the necessary circuits for break-in opera-
tion. Closing the key removes the blocking bias
from the cathode of V101 (6AG5), causing oscil-
lations to develop in the modified Pierce electron-
coupled oscillator stage. A keying filter, consist-
ing of C101 (1 uf), R102 (68K), and LR101 (80
uh, 560 ohms) in the oscillator circuit and C116
(5 uf) and the- cathode circuit resistance in the
RF power amplifier stage, properly shapes the
keyed character to eliminate "clicks". Cathode
current from the r-f power amplifier (V102, 2E26)
flows through the relay coil. The relay armature
is held when the transmitter is not keyed. The
added resistance of the relay coil is sufficient to
increase the cathode bias of the 2E26 to prevent
excessive power from being dissipated in the r-f
power amplifier when no grid drive is applied.
Closing the key shorts the relay coil, bypassing
the 2E26 cathode current to ground, and releases
the relay armature. This switches B power from
the receiver and applies the B power to the 6AG5
oscillator screen grid and to the neon bulb relaxa-
101
EXTERNAL
XTAL
2101C10 3
Viol
6AG5
Osc
6101 CI02
211?
3 ?
1.0 MF
6811
R102
560
90
1.111
THIS CONTACT
ris CONJACT
CLOSED WIEN
KEY IS 10-520
INTO CASE.
X
100
C104
000TUNING./
C105
5." 1810T
12
'OSC
TUNING
NO
EH"
LI
HF EF
9-2E) MF 5101
C106 3311
2/5V 11105
22
IF-
C107
1.5
MEG
11106
V102
2E26
RF PER AMP
IC
5
Z.71; 46
2
3
2 '7:7-741ir
R1013P. ?OS
tion oscillator (E104) which develops the sidetone
for monitoring the transmitter. When the key is
closed, the terminal labeled REC ANT is grounded
through C115 (.01) to prevent the transmitted
signal from paralyzing the receiver. Releasing the
relay armature also switches the antenna from
the receiver to the transmitter. A bug key when
inserted halfway into the KEY JACK will oper-
ate the relay the same as the attached sending
key. An automatic tape keyer when inserted all
the way into the KEY JACK shorts out the relay
and adds into the 2E26 cathode circuit a 1200
ohm resistor which holds the plate current to a
safe value in the key up position. In the key
down position, this resistor is shorted out.
c. L102, in the plate of the power amplifier, is
a parasitic suppressor.
d. A five-position rotary switch provides a range
of output impedances for maximum antenna out-
put. Each position doubles the impedance of the
previous position from 75 ohms on position 1 to
1200 ohms on position 5. An incandescent bulb,
E103, serves as an antenna current indicator.
e. Resonance of the Oscillator and final ampli-
fier plate tanks is indicated by the maximum
glow of two neon bulbs, E101 and E102, re-
spectively.
:rot
.01 UP
*11001
L 102 C110 nigADOR LUG
2711
0109
AMP
FINAL / TUNING
AMP .; INC
3 RFC CIE I OPEN
TUNING ?102
vIL 103 DISTMOUTED
CAPACITY
LF
o Li04
c>
0-05
0?o
jSI02
12
RHO
5103
TUNE TUNE
ANTENNA
IMPEDANCE
MATCHING
SWITCH
?01101.0-0
NOTE: VOLTAGE MEASUREMENTS TAKEN TO GROUND
USING A 20,000 OHM/VOLT METER AND ARE DC. .7571,
KEY IS DOWN. AND 3 MC XTAL IS USED.
L R101 CII
L106
1001.15
KEY
2104
24
KEYS PRESSED.
RII2
1200
HS KEY JACK
1.101
.-REO NOTE PLS VIEWED FROM FRONT
ANT
OUTPUT
IND
E 103
# 10. Is41,26 ,001) MF
RIII C114
RELAY
1001
NOTE RESISTORS ARE IN OHMS UNLESS OTHERWISE SPECIFIED.
CAPACITORS ARE IN MMF UNLESS OTHERWISE SPECIFIED.
Figure 18. Tfansmitter RT-6, schematic diagram.
J103
r
NEC ANT
I
I I MONITOR
L-_J
E104
SIDETONE
OSC .0_,W
IA, CII5
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Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
C-I12
C-111 L-IO2 1-102 KEY GAP E-I0 4 R-111 KEY SPRING
ADJUSTMENT TENSION ADJUSTMENT
E-I 0 4
a-S-104
V-I 02
FINAL AMP
2E26
1-101
5-102
0-1 14
J-103
S-10I
5-101
r
J-I0 2 E-I03 J-I01 R-I05 R-I09
X-101 PL-5
R-I06
C-I05
1-103
E-I03 5-102 C-I12 J-I01 C-I09 1-102 C-107 X-I01 R-I 0 4 J103 1-103
J-IO2
R-I08 C-108 R-I07 LR-I01 R-102 C-102 C-104 C-I03 PL-5 0-1 01
R-I10 J-I03 S-102 R-II2 J-101 L-1 0 6 C-I 0 8 R-I08 0-107 R-107 LR-I01 0-IO2 0-I0 4 R- 10 2
R-101
C-116 PL-5
R-104
J-102
L-I04
S-103
K-10I
RELAY
L-I05
0-101
V-101
OSC
6AG5
C-I 0 6
J-I03
?4414;
tt,,rrr
C-I12
L-10 3
0-110
1-102
L-102
V-IO2
FINAL AMP
2526
Figure 19. Transmitter RT-6, parts location.
L-I01 C-115
S-I04
25
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Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
29. CORRECTIVE MAINTENANCE OF
TRANSMITTER
a. A trouble-shooting chart for the transmitter
is supplied as an aid in locating trouble. Voltage
and resistance measurements of the defective cir-
cuit should ordinarily be sufficient to isolate
deiective components .not specifically mentioned
in the trouble-shooting chart.
TRANSMITTER RT-6 TROUBLE-SHOOTING CHART
SYMPTOM
PROBABLE CAUSE
REMEDY
Low power output.
Low oscillator output.
Replace 6AG5.
Shorted bypass.
Replace C106.
Defective crystal.
Replace crystal.
Weak 2E26.
Replace.
Open output indicator.
Replace.
Shorted coil turn (check coils at taps).
Remove short.
Limited tuning range.
Shorted coil turn (check coils at taps).
Remove short.
Low harmonic output.
Defective crystal.
Replace.
Poor keying waveform. (Complaint of key
clicks from listener.)
Open C101 or C116.
Replace.
Defective crystal.
Replace.
No sidetone.
Defective neon bulb.
Replace.
No break-in operation.
Receiver B -I- relay not making contact.
Readjust contact or replace relay.
No B -I- voltage.
Jumper open between pins 2 and 6 on
transmitter cable plug.
Repair.
b. The power output of the transmitter is
dependent upon the frequency of the signal trans-
mitted. The following table lists the minimum
output at various frequencies.
MINIMUM POWER OUTPUT
FOR VARIOUS FREQUENCIES
Band
Frequency
(roc)
Harmonic of
Crystal
Minimum Output
(watts)
Low
3.0
Fundamental
9
4.0
Fundamental
9
5.0
Fundamental
9
6.0
Fundamental
9
High
7.0
Fundamental
6
8.0
Second
6
10.0
Second
6
12.0
Second
6
15.0
Third
6
26
30. SENDING KEY ADJUSTMENT
a. The sending key spring tension adjustment
is the screw below the chassis nearest the knob
of the sending key shown in Figure 19. The pre-
ferred degree of spring tension, depends upon the
operator. The spring tension should be sufficient
to open the key immediately when the pressure
is released and yet not so great as to require the
expenditure of unnecessary energy.
b. The sending key gap adjustment is the
screw on the chassis to the rear of the spring
tension adjustment screw. See Figure 19. If the
gap between the contacts is too narrow, it will
result in a jittery style of sending. If the gap is
too wide, a sluggish sending style will result. A
good gap separation is approximately .025 inches.
c. Excessive play at the hinge, provided for
folding the key into the case, can be taken up
by tightening the screw and lock-nut at the pivot
point.
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Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
SECTION III. POWER SUPPLY RP-6
31. CIRCUIT DESCRIPTION?(See Schematic Dia-
gram, Figure 20)
a. AC?An eight-tap primary on the trans-
former provides for a wide range of input volt-
ages at frequencies from 40 to 400 cps. The
secondary voltage is rectified by a full-wave rec-
tifier tube (6X4) and passed on to the Filter-
Accessory Unit RA-6.
OFF
o VI
08
1201 405 V AC
? 9011?
2700
2300 GRN ozg
S201 190o BLU
BLK 5
120
950
709
R201
BRN
WH
G-4-9
OR 2
.001F
040 OR C2017.1600V
A
,r1006MF
0110 C20111-600V
RED 405V AC
100K
R202
100 K
GAN CV
4201
GRN
F201
I-1/2 AMP
TAN
12
V201
RECT
6X4
b. Battery?The 6-volt de is converted to ac
and stepped up by the vibrator and transformer.
It is rectified by a type 6X4 rectifier tube and
passed on to the Filter-Accessory Unit RA-6.
L201, L202, C203, C204, and C205 serve as hash
suppressors.
4 wm-
7 RED
BLU
8+
FIL
POWER
PLUG
SO3
03
6
5
YEL
Fl
BRN
63V
AC
15.5V AC OR
'" 13
10.5VAC BLK
'&14
0015
0 16
cs-o?OV
?-017
.9VAC
6.5V AC WH
2.3 V AC R203
56
56
0201_
loon-
L 202
VI
_L
PINK'
VI
.5 MF
C20E-
G201
VIBRATOR
.0111,
7 G204-I
6 8
SOI
OPERATE
L 201
'On ?-?
C2ok_.6
.01ILAF
F202
15 AMP
8
7
6
5
4
1201
CONNECTIONS
3
2
1
GRN
RED
5 7
21141 "T
GRN SO2
NOTE: VOLTAGE VOLTAGE MEASUREMENTS TO GROUND USING A wpm OHM/VOLT METER AND ARE DC
UNLESS OTHERWISE SPECIFIED.
AC OPERATED.
BATTERY CHARGING
CONNECTIONS
(503 MUST BE DISCONNECTED)
SO1
SO2
OPERATE BATT CHARGE
AC TO 6v
INLET BATTERY
NOTES: ALL PLUGS VIEWED FROM FRONT.
RESISTORS ARE IN OHMS UNLESS OTHERWISE SPECIFIED.
Figure 20. Power Supply RP-6, schematic diagram.
CR201
BATT
CHARGE
10
12
13
14
9
11
15
16
17
27
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06 : CIA-RDP78-03561A000200060001-2
TILT CHASSIS AS
SHOWN AND REMOVE
CLAMP TO PERMIT
REMOVAL OF
VIBRATOR
COVER CATCH
RELEASE
REMOVE THIS NUT BEFORE
LIFTING OUT CHASSIS
Figure 21. Power Supply RP-6, vibrator replacement.
c. Battery Charging A tap on the low voltage
winding of the transformer provides suitable
power for charging a battery with the full-wave
selenium rectifier (CR201) which is contained in
the unit. The charging rate depends upon the
charge in the battery. When the electrolyte has
a specific gravity of 1.180 the charging current
will be at least 3.5 amperes. As the specific grav-
ity increases to 1.280 the charging current grad-
ually drops 0.8 ampere.
32. HOW TO REPLACE VIBRATOR
a. Loosen the nut shown in Figure 21.
b. Tilt the chassis up as shown and take off
the clamp holding the vibrator in the socket by
removing the two screws at the ends of the clamp.
c. Remove the vibrator by lifting it out.
28
SPACER
NUTS
S0-3 R-203 C-205 C-202
R-204 L-202 C-203 C-201
Figure 22. Power Supply RP-6, parts location.
1-201
G-201
S-201
SO-2
V-20I
RECT
6X4
E-201
CR-201
F-201
C-204
F-202
C-206
33. HOW TO REPLACE POWER TRANSFORMER
(See Figure 22)
a. Tag and disconnect all leads from trans-
former terminal strips.
b. Remove the hex spacer nuts (A, Figure 22).
c. Lift out transformer.
34. CORRECTIVE MAINTENANCE OF POWER
SUPPLY
A trouble-shooting chart for the power supply
is supplied as an aid in locating trouble. Voltage
and resistance measurements of the defective cir-
cuit should ordinarily be sufficient to isolate
defective components not specifically mentioned
in the trouble-shooting chart that follows.
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
POWER SUPPLY RP-6 TROUBLE-SHOOTING CHART
SYMPTOM
PROBABLE CAUSE
REMEDY
15 amp fuse blown.
Shorted buffer capacitor C201 or C202.
Replace.
Excessive vibrator hash in receiver.
Worn vibrator G201.
Replace.
Open capacitor C206.
Replace.
Battery discharges instead of charging
under battery charging operation.
Shorted selenium rectifier CR201.
Replace.
Neon bulb E201 fails to light with line
Defective neon bulb E201.
Replace with red-tipped neon
voltage applied to proper tap position.
bulb.*
Neon bulb E201 lights with line voltage
Defective neon bulb E201.
Replace with red-tipped neon
switch set one position higher than cor-
rect position.
bulb.*
No filament voltage.
Open lead at power plug S03.
Repair.
No B + voltage.
Open lead at power plug S03.
Repair.
1.5 amp fuse blown.
Shorted filter capacitor C301 or C302 in
Replace.
' Filter unit.
Shorted rectifier tube 6X4.
Replace.
Open regulator tube in Filter unit caus-
ing excessive receiver voltage.
Replace.
Open resistor R301, R302, R303 or R304.
Replace.
*Red-tipped neon bulbs are for Power Supply only (Ionizing Potential 53-55V rms)
SECTION IV.
FILTER-ACCESSORY UNIT RA-6
35. CIRCUIT DESCRIPTION?(See Schematic Dia-
gram, Figure 23)
a. AC Operation?The Filter-Accessory Unit
RA-6 filters the de from the power supply and
delivers it to the transmitter and receiver. Two
5644 (or 5787) voltage regulator tubes provide
regulation for the receiver supply. The filter unit
provides four output voltages.
(1) 6.3-v ac at 2.4 amperes for filaments,
(2) 400-v dc at 75 ma (unregulated) for the
transmitter,
(3) two 90-v dc at 25 ma (regulated) taps
for the receiver.
The B supply for the transmitter or the re-
ceiver is chosen by a DPDT switch marked
RECVR-TRANS. When in the RECVR posi-
tion, power is applied only to the RECVR.
When in the TRANS position, power is applied
to the transmitter and also to the receiver when
not transmitting through the break-in relay lo-
cated in the transmitter.
b. Battery Operation ?Filter -A ccessory Unit
RA-6 performs the same under battery operation
as under ac. The output voltages are also the
same except that the filament voltage is dc in-
stead of ac and is furnished by the battery.
c. Interlock?An interlock is provided in PL3
to avoid damage to the rectifier or input filter
capacitor should the input power be applied when
no load is connected to the power supply output.
If the power is applied to Power Supply RP-6
alone, both the filaments and the cathode of the
rectifier are open because S03 and PL3 are dis-
connected.
If only Filter-Accessory Unit RA-6 is con-
nected to the power supply, there are two con-
ditions possible:
(1) With the toggle switch set at TRANS
the rectifier filaments are connected, but SOS is
disconnected and the cathode circuit is open.
(2) With the toggle switch set at RECVR,
the rectifier cathode is connected to the input
filter capacitor; however, the filter output is con-
nected to the voltage regulator stages, and the
load is sufficient to keep the voltage across the
input capacitor at a safe value.
36. HOW TO DISASSEMBLE
a. Remove the two flat head screws from bot-
tom of housing.
29
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b. Remove the three screws on the cover (A,
Figure 10).
c. The chassis can then be lifted from the
housing and serviced without disconnecting the
choke leads.
d. To remove the choke, remove the two bin-
derhead screws on bottom of housing, and lift out.
37. CORRECTIVE MAINTENANCE OF FILTER-
ACCESSORY UNIT
A trouble-shooting chart for the filter-accessory
unit is supplied as an aid in locating trouble.
Voltage and resistance measurements of the de-
fective circuit should ordinarily be sufficient to
isolate defective components not specifically men-
tioned in the trouble-shooting chart that follows.
FILTER-ACCESSORY UNIT RA-6 TROUBLE-SHOOTING CHART
SYMPTOM
PROBABLE CAUSE
REMEDY .
Receiver voltage much higher than nor-
mal.
No B ? voltage.
No filament voltage.
Open regulator tube.
Open resistor R301, R302, R303, or R304.
Broken lead at plug PL3.
Open choke L301.
Broken lead at plug PL3.
Replace.
Replace.
Repair.
Replace.
Repair.
30
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4I5V GRN
4I5V
GRN
1.5 MF 1.5 MF 5 MF
45301-F3 C302
1
06 RED
S301 R301 R303
8000 8000
R305 R302 R304
1 MEG 4000 4000
PL3
POWER ------
SUPPLY
":"--
2
6
4
----.
V301
5644
OR
5787
REGULATOR
5 0
3 0
0
0
0
0
I
S301
CONNECTIONS
6. 3V A.C. BRN
FIL
90V
OR
V302
5644
OR
5787
REGULATOR
90V
RECVR
SO6
FIL
NOTE I. VOLTAGE MEASUREMENTS TAKEN TO GROUND USING A
20,000 OHM/VOLT METER AND ARE DC.
2. ALL PLUGS VIEWED FROM FRONT.
3. RESISTORS ARE IN OHMS UNLESS OTHERWISE SPECIFIED.
Figure 23. Filter-Accessory Unit RA-6, schematic diagram.
OR
V-30I
VOLTAGE REG
5644 OR 5787
V-302
VOLTAGE REG
5644 OR 5787
O-301A a 8
S-30I SO-6 SO-5
Figure 24. Filter-Accessory Unit RA-6, parts location.
W-30I
W-302
463B1113-0
31
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SECTION V.
38. UNITS IN PLASTIC POUCH
a. When not in use, or when transporting, the
units should be kept in the plastic pouches pro-
vided, as shown in Figure 25. The pouches are
waterproof if folded in the prescribed manner.
b. There are two sizes of pouches?two large
ones for Transmitter RT-6 and Receiver RR-6
and two small ones for the Power Supply RP-6
UNIT IN
POSITION
STRAP
WATERPROOFED
POUCH
INSERT UNIT INTO
WATERPROOFED POUCH
STRAP
FOLD ENDS
INWARD
32
OEXCESS MATERIAL OF
POUCH TO BE FOLDED
INWARD AND HELD TIGHT
PACKAGING
and Filter-Accessory Unit RA-6. All are used as
shown in Figure 25.
39. UNITS IN CLOTH BAG
Several of the additional accessories are con-
tained in a small cloth bag which is not water-
proof. They are the hank antenna, the antenna
insulators, the battery clamps and the inter-unit
connecting cord.
FOLD END
UNDER
DRAW POUCH TOGETHER AND
FOLD EXCESS MATERIAL TO
THICKNESS OF UNIT CONTAINED
AS MANY TIMES AS NECESSARY.
FOLD OPEN END UNDER.
Figure 25. Packaging detail.
STRAP
ODRAW STRAP OVER FOLDED
EXCESS MATERIAL OF POUCH
AND SNAP IN PLACE
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Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
CHAPTER 4
REPLACEMENT PARTS LISTS
SECTION I. RECEIVER RR-6
Ref.
No.
Contractor's
Drawing &
Part Number
JAN Type
Description
Cl
921R121
CC3OSL470K
CAPACITOR, FIXED, CERAMIC DIELECTRIC: tubular type; 47 uuf
?10%; 500 vdcw
C2
921R107
CC2OSL220K
CAPACITOR, FIXED, CERAMIC DIELECTRIC: tubular type; 22 uuf
?10%; 500 vdcw
.
C3
921R142
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .001 uf;
500 vdcw
C7
921R109
CC2OSL270K
CAPACITOR, FIXED, CERAMIC DIELECTRIC: tubular type; 27 uuf
?10%; 600 vdcw
C8
921R104
CC2OSL150K
CAPACITOR, FIXED, CERAMIC DIELECTRIC: 15 uuf ? 10%; 600
vdcw
C9A,
C9B,
419D101
CAPACITOR, VARIABLE, AIR DIELECTRIC: plate meshing type; 3
sections; A & C-10 to 186 uuf; B-14 to 190 uuf; includes wormdrive
C9C
C10
419A103
CAPACITOR, VARIABLE, AIR DIELECTRIC: plate meshing type; 1.7
to 8.7 uuf
C11
419A103
CAPACITOR, VARIABLE, AIR DIELECTRIC: plate meshing type; 1.7
to 8.7 uuf
C12
921R152
CAPACITOR, FIXED, CERAMIC DIFT vACTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
C13
21R116042
CAPACITOR, FIXED, CERAMIC DIELECTRIC: tubular type; 100 uuf
?5% N220
C14
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
C15
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
C16
419A103
CAPACITOR, VARIABLE, AIR DIELECTRIC: plate meshing type; 1.7
to 8.7 uuf
C17
419A103
CAPACITOR, VARIABLE, AIR DIELECTRIC: plate meshing type; 1.7
to 8.7 uuf
C18
921R328
CM20D202J
CAPACITOR, FIXED, MICA DIELECTRIC: 2000 uuf ?5%; 300 vdcw
C19
421A137
CAPACITOR, FIXED, CERAMIC DIELECTRIC: tubular type; 7.5 uuf
? 0.25 uuf; 500 vdcw
C20
921R705
CAPACITOR, FIXED, MICA DIELECTRIC: 1000 uuf ?5%; 500 vdcw
C21
421A137
CAPACITOR, FIXED, CERAMIC DIELECTRIC: tubular type; 7.5 uuf
? 0.25 uuf; 500 vdcw
33
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Ref.
No.
Contractor's
Drawing &
Part Number
JAN Type
Description
C22
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
C23
921R463
CC2OCJ020C
CAPACITOR, FIXED, CERAMIC DIELECTRIC: tubular type; 2 uuf
? 0.25 uuf; 500 vdcw
C24
921R621
CC2OCH010C
CAPACITOR, FIXED, CERAMIC DIELECTRIC: tubular type; 1 uuf
? 0.25 uuf; 500 vdcw
C25
921R101
CC20S1,100K
CAPACITOR, FIXED, CERAMIC DIELECTRIC: tubular type; 10 uuf
?10%; 500 vdcw
C26
419A103
CAPACITOR, VARIABLE, AIR DIELECTRIC: plate meshing type; 1.7
to 8.7 uuf
C27
921R622
CAPACITOR, FIXED, CERAMIC DIELECTRIC: tubular type; 8.2 uuf
? 0.25 uuf; 500 vdcw
C29
419A103
CAPACITOR, VARIABLE, AIR DIELECTRIC: plate meshing type; 1.7
to 8.7 uuf
C30
921R127
CC3OSL101K
CAPACITOR, FIXED, CERAMIC DIELECTRIC: tubular type; 100 uuf
?10%; 500 vdcw
C31
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
C32
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
C33
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
C34
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
C35
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
C36
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
C37
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
C39
921R142
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .001 uf
500 vdcw
C40
921R123
CC3OSL560K
CAPACITOR, FIXED, CERAMIC DIELECTRIC: tubular type; 56 uuf
?10%; 500 vdcw
C41
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
C43
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
C44
921R152
CAPACITOR, FIXED, 'CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
34
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Ref.
No.
Contractor's
Drawing &
Part Number
JAN Type
Description
C45
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
C46
92IR121
CC3OSL470K
CAPACITOR, FIXED, CERAMIC DIELECTRIC: tubular type; 47 uuf
?10%; 500 vdcw
C47
921R127
CC3OSL101K
CAPACITOR, FIXED, CERAMIC DIELECTRIC: tubular type; 100 uuf
?10%; 500 vdcw
C48
921R110
CC2OSL330K
CAPACITOR, FIXED, CERAMIC DIELECTRIC: tubular type; 33 uuf
?10%; 500 vdcw
C49
419B102
CAPACITOR, VARIABLE, AIR DIELECTRIC: plate meshing type; 1.7
to 8.7 uuf; special shorting type
C50
92IR127
CC3OSL101K
CAPACITOR, FIXED, CERAMIC DIELECTRIC: tubular type; 100 uuf
?10%; 500 vdcw
C51
921R109
CC2OSL270K
CAPACITOR, FIXED, CERAMIC DIELECTRIC: tubular type; 27 uuf
?10%; 500 vdcw
C52
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
C53
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
CR1
448B104
CRYSTAL UNIT, RECTIFYING: germanium type; G.E. type IN48
or
448K105
CRYSTAL UNIT, RECTIFYING: germanium type; Kemtron type IN34
Or
448K106
CRYSTAL UNIT, RECTIFYING: germanium type; Sylvania type IN34
' 436B102
DIAL, BFO CONTROL
12
436C101
DIAL, TUNING
13
401 V737
INDICATOR, FREQUENCY CHANNEL: with red and blue windows
and rack gear
14
401V484
KNOB ASSEMBLY, ADJUST CALIBRATION: with adjustment screw
15
438B101
KNOB, RANGE SWITCH
16
401V752
KNOB ASSEMBLY, VERNIER: complete with brackets, bushings, ten-
sion spring, J2
J1
409C153
CONNECTOR, 2-PIN (Antenna and Ground)
J2
409K154
CONNECTOR, 2-PIN (Phones)
LI
424K138
COIL, RADIO FREQUENCY CHOKE: 220 uh
L2
424B164
COIL, RADIO FREQUENCY: 945 uh; tapped; adjustable iron core; beat
frequency oscillator
PL6
428A104
CONNECTOR, PLUG: 4 male contacts; plug only
Or
401B518
CONNECTOR ASSEMBLY, PLUG: 4 male contacts; with cable
R1
906R526
RC2OBF563K
RESISTOR, FIXED, COMPOSITION: 56,000 ohms ?10%; %W; ins
35
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Ref.
No.
Contractor's
Drawing &
Part Number
JAN Type
Description
R2
906R445
RC2OBF681K
RESISTOR, FIXED, COMPOSITION: 680 ohms ?10%; %W; ins
R3
906R565
RC2OBF474M
RESISTOR, FIXED, COMPOSITION: 470,000 ohms ?20%; %W ins;
R4
906R488
RC2OBF682M
RESISTOR, FIXED, COMPOSITION: 6800 ohms ?20%; %W; ins
R5
906R495
RC2OBF103M
RESISTOR, FIXED, COMPOSITION: 10,000 ohms ?20%; %W; ins
R6
906R414
RC2OBF121K
RESISTOR, FIXED, COMPOSITION: 120 ohms ?10%; %W; ins
R7
906R502
RC2OBF153M
RESISTOR, FIXED, COMPOSITION: 15,000 ohms ?20%; %W; ins
R8
906R488
RC2OBF682M
RESISTOR, FIXED, COMPOSITION: 6800 ohms ?20%; 54W; ins
R9
906R600
RC2OBF335M
RESISTOR, FIXED, COMPOSITION: 3.3 megohms ?20%; %W;(ins
R10
906R50.2
.RC2OBF153M
RESISTOR, FIXED, COMPOSITION: 15,000 ohms ?20%; %W; ins
R11
906R495
RC2OBF103M
RESISTOR, FIXED, COMPOSITION: 10,000 ohms ?20%; 34TiV; ins
R12
906R565
RC2OBF474M
RESISTOR, FIXED, COMPOSITION: 470,000 ohms ?20%; 34W; ins
R13
906R470
RC2OBF272K
RESISTOR, FIXED, COMPOSITION: 2700 ohms ?10%; %W; ins
R14
906R526
RC2OBF563K
RESISTOR, FIXED, COMPOSITION: 56,000 ohms ?10%; %W; ins
R15
906R526
RC2OBF563K
RESISTOR, FIXED, COMPOSITION: 56,000 ohms ?10%; %W; ins
R16
906R488
RC2OBF682M
RESISTOR, FIXED, COMPOSITION: 6800 ohms ?20%; 34W; ins
R17
906R565
RC2OBF474M
RESISTOR, FIXED, COMPOSITION: 470,000 ohms ?20%; 34W; ins
R18
906R470
RC2OBF272K
RESISTOR, FIXED, COMPOSITION: 2700 ohms ?10%; 34W; ins
R19
906R526
RC2OBF563K
RESISTOR, FIXED, COMPOSITION: 56,000 ohms ?10%; 34W; ins
R20
906R526
RC2OBF563K
RESISTOR, FIXED, COMPOSITION: 56,000 ohms ?10%; %W; ins
R21
906R488'
RC2OBF682M
RESISTOR, FIXED, COMPOSITION: 6800 ohms ?20%; %W; ins
R23
906R526
RC2OBF563K
RESISTOR, FIXED, COMPOSITION: 56,000 ohms ?10%; 34W; ins
R25
906R526
RC2OBF563K
RESISTOR, FIXED, COMPOSITION: 56,000 ohms ?10%; %W; ins
R26
906R554
RC2OBF274K
RESISTOR, FIXED, COMPOSITION: 270,000 ohms ?10%; 54W; ins
R27
906R431
RC2OBF331K
RESISTOR, FIXED, COMPOSITION: 330 ohms ?10%; %W; ins
R28
418B105
RESISTOR, VARIABLE, COMPLPSITION: 1 megohm ?20%; 1/10W;
includes knob
R29
906R488
RC2OBF682M
RESISTOR, FIXED, COMPOSITION: 6800 ohms ?20%; %W; ins
R30
906R554
RC2OBF274K
RESISTOR, FIXED, COMPOSITION: 270,000 ohms ?10%; %W; ins
R31
906R537
RC2OBF104M
RESISTOR, FIXED, COMPOSITION: 100,000 ohms ?20%; %W; ins
R32
906R495
RC2OBF103M
RESISTOR, FIXED, COMPOSITION: 10,000 ohms ?20%; 54W; ins
R33
906R565
RC2OBF474M
RESISTOR, FIXED, COMPOSITION: 470,000 ohms ?20%; 34W; ins
36
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Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
Ref.
No.
Contractor's
Drawing &
Part Number
JAN Type
Description
R34
906R540
RC2OBF124K
RESISTOR, FIXED, COMPOSITION: 120,000 ohms ?10%; %W; ins
Si
440C102
SWITCH, SLIDE: range switch; with knob
S2
440A103
SWITCH, PUSH: single-pole, single-throw; momentary contact; normally
open
Ti
424B162
TRANSFORMER, RADIO FREQUENCY: adjustable iron core; LF
antenna
T2
424B163
TRANSFORMER, RADIO FREQUENCY: adjustable iron core; HF
antenna
T3
424B158
TRANSFORMER, RADIO FREQUENCY: adjustable iron core; LF RF
T4
424BI59
TRANSFORMER, RADIO FREQUENCY: adjustable iron core; HF RF
T5
424B160
TRANSFORMER, RADIO FREQUENCY: adjustable iron core; LF Osc
T6
424B161
TRANSFORMER, RADIO FREQUENCY: adjustable iron core; HF Osc
T7
424B121
TRANSFORMER, INTERMEDIATE FREQUENCY: 455 kc; input;
iron core; double-tuned; with shield
T8
424B121
TRANSFORMER, INTERMEDIATE FREQUENCY: 455 kc; interstage;
iron core; double-tuned; with shield
T9
424B121
TRANSFORMER, INTERMEDIATE FREQUENCY: 455 kc; output;
iron core; double-tuned; with shield
T10
425B121
TRANSFORMER, AUDIO FREQUENCY: plate-to-phone coupling type
VI
ELECTRON TUBE: subminiature pentode; 8 term wire type; RMA type
5899
V2
ELECTRON TUBE: subminiature pentode; 8 term wire type; RMA type
5899
V3
ELECTRON TUBE: subminiature pentode; 8 term wire type; RMA type
5899
V4
ELECTRON TUBE: subminiature pentode; 8 term wire type; RMA type
5899
V5
ELECTRON TUBE: subminiature pentode; 8 term wire type; RMA type
5899
V6
ELECTRON TUBE: subminiature triode; 8 term wire type; RMA type
5718
V7
?
ELECTRON TUBE: subminiature triode; 8 term wire type; RMA type
5718
V8
ELECTRON TUBE: subminiature triode; 8 term wire type; RMA type
5718
X1
409B118
SOCKET, CRYSTAL: with switch
Y1
CRYSTAL UNIT, QUARTZ: plug-in type (not furnished with receiver)
Y2
448A103
CRYSTAL UNIT, QUARTZ: 500 kc
37
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SECTION II. TRANSMITTER RT-6
Ref.
No.
Contractor's
Drawing &
Part Number
JAN Type
Description
C101
408A102
CAPACITOR, FIXED, METALLIZED PAPER: 1 uf ?20%; 200 vdcw
C102
921R110
CC2OSL330K
CAPACITOR, FIXED, CERAMIC DIELECTRIC: tubular type; 33 uuf
?10%; 600 vdcw
C103
921R142
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .001 uf;
500 vdcw
C104
921R127
CC3OSL101K
CAPACITOR, FIXED, CERAMIC DIELECTRIC: tubular type; 100 uuf
?10%; 500 vdcw
C105
419B121
CAPACITOR, VARIABLE, AIR DIELECTRIC: plate meshing type; 7.5
uuf to 176 uuf
C106
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
C107
921R107
CC2OSL220K
CAPACITOR, FIXED, CERAMIC DIELECTRIC: tubular type; 22 uuf
?10%; 500 vdcw
C108
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
C109
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 "uf
?20% +80%; 450 vdcw
C110
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
C111
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
C112
419B104
CAPACITOR, VARIABLE, AIR DIELECTRIC: plate meshing type; 11
uuf to 218 uuf
C114
921R142
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .001 uf;
500 vdcw
C115
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
?20% +80%; 450 vdcw
C116
423A104
CAPACITOR, FIXED, ELECTROLYTIC: Aerovox type SREN; 6 uf;
150 vdcw
E101
465A121
LAMP, GLOW: neon; W,W; ionizing potential 47-55v rms (contractor's
color code red or blue)
E102
465A121
LAMP, GLOW: neon; 3i,W; ionizing potential 47-55v rms (contractor's
color code red or blue)
E103
465A113
LAMP, INCANDESCENT: G.E. type 49; 2v; .06 amp; tubular; clear
glass; bayonet base
E104
465A121
LAMP, GLOW: neon; hW; ionizing potential 47-69v rms (contractor's
color code red, blue or yellow)
1101
436B125
?
KNOB: ANT IMPEDANCE MATCHING SWITCH
38
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
Ref.
No.
Contractor's
Drawing &
Part Number
JAN Type
Description
1102
436B156
KNOB; FINAL AMP TUNING
1103
436B127
KNOB; OSC TUNING
J101
409A158
JACK, TELEPHONE, THREE CIRCUIT: accommodates 2-conductor
Army plug PL55
J102
409K154
CONNECTOR, 2-pin (Antenna and Ground)
J103
409C153
CONNECTOR, 2-pin (Rec Ant and Monitor)
K101
459C112
RELAY, KEYING, DPDT: switches antenna and B power
L101
424A128
COIL, RADIO FREQUENCY: plate tank; 16.4 uh
L102
424A143
COIL, RADIO FREQUENCY CHOKE
L103
424A155
COIL, RADIO FREQUENCY CHOKE: 100 uh
L104
424B204
COIL, RADIO FREQUENCY: HF plate tank; 5 taps
L105
424B202
COIL, RADIO FREQUENCY: LF plate tank; 5 taps
L106
424B201
COIL, RADIO FREQUENCY CHOKE: 100 uh
LR101
424A156
COIL, RADIO FREQUENCY: 80 uh; wound on 560-ohm ?10% %W
fixed composition resistor
PL5
428A122
CONNECTOR, PLUG: 6 male contacts
R101
906R536
RC2OBF104K
RESISTOR, FIXED, COMPOSITION: 100,000 ohms ?10%; %NV; ins
R102
906R529
RC2OBF683K
RESISTOR, FIXED, COMPOSITION: 68,000 ohms ?10%; 34W; ins
R104
906R547
RC2OBF184K
RESISTOR, FIXED, COMPOSITION: 180,000 ohms ?10%; %W; ins
R105
906R781
RC3OBF333K
RESISTOR, FIXED, COMPOSITION: 33,000 ohms ?10%; 1W; ins
R106
906R585
RC2OBF155K
RESISTOR, FIXED, COMPOSITION: 1.5 megohms ?10%; 34W; ins
R107
906R778
RC3OBF273K
RESISTOR, FIXED, COMPOSITION: 27,000 ohms ?10%; 1W; ins
R108
906R960
RC42BE271K
RESISTOR, FIXED, COMPOSITION: 270J:41ms ?.10%; 2W; ins
R109
906R1044
RC42BE273K
RESISTOR, FIXED, COMPOSITION: 27,000 ohms ?10%; %W; ins
R110
906R372
RC2OBF120K
RESISTOR, FIXED, COMPOSITION: 12 ohms ?10%; 54W; ins
R111
906R620
RC2OBF106K
RESISTOR, FIXED, COMPOSITION: 10 megohms ?10%; %W; ins
R112
906R988
RC42BE122K
RESISTOR, FIXED, COMPOSITION: 1,200 ohms ?10%; 2W; ins
5101
440A123
SWITCH, SLIDE: single-pole, double-throw
S102
440A122
SWITCH, SLIDE: double-pole, double-throw
S103
440B104
SWITCH, ROTARY: special; 5-position with OFF; 2 poles
S104
401V724
KEY ASSEMBLY, TRANSMITTER
39
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
; Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
Ref.
No.
Contractor's
Drawing &
Part Number
JAN Type
Description
17101
ELECTRON TUBE: miniature pentode; 7 pins; RMA type 6AG5
V102
ELECTRON TUBE: pentode; octal; pin type; RMA type 2E26
X101
409A131
SOCKET, CRYSTAL
Y101
CRYSTAL UNIT, QUARTZ (not furnished with transmitter)
,
SECTION III. POWER SUPPLY RP-6
Ref.
No.
Contractor's
Drawing &
Part Number
JAN Type
Description
C201
408A123
CAPACITOR, FIXED, PAPER DIELECTRIC: .006 uf 1600 vdcw
C202
408A123
CAPACITOR, FIXED, PAPER DIELECTRIC: .006 uf 1600 vdcw
C203
408A121
CAPACITOR, FIXED, PAPER DIELECTRIC: .5 uf 200 vdcw
C204
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
-20% +80%; 450 vdcw
C205
408K107
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .5 uf
-20% +80%; 200 vdcw
C206
921R152
CAPACITOR, FIXED, CERAMIC DIELECTRIC: disc type; .01 uf
-20% +80%; 450 vdcw
CR201
448C123
RECTIFIER, METALLIC: selenium, full-wave
E201
465A121
'LAMP, GLOW: neon; XW; ionizing potential 53-55V rms (contractor's
color code red)
F201
465A111
FUSE, GLASS TUBULAR: 1.5 amperes; 250V
F202
465K112
FUSE, GLASS TUBULAR: 15 amperes; 32V
G201
448B101
VIBRATOR, NON-SYNCHRONOUS: 115 cps, 6 vdc
1201
436B101
KNOB, LINE VOLTAGE SELECTOR: permanently glued to shaft of
8-201
L201
424A157
COIL, RADIO FREQUENCY CHOKE: 6.0 uh
L202
.COIL, RADIO FREQUENCY CHOKE: not replaceable?formed by lead
wire
R201
906R535
RC2OBF104J
RESISTOR, FIXED, COMPOSITION: 100,000 ohms ?5%; 34W; ins
R202
906R535
RC2OBF104J
RESISTOR, FIXED, COMPOSITION: 100,000 ohms ?5%; 34W; ins
R203
906R400
RC2OBF560
RESISTOR, FIXED, COMPOSITION: 56 ohms ?10%; %W; ins
R204
906R400
RC2OBF560K
RESISTOR, FIXED, COMPOSITION: 56 ohms ?10%; %W; ins
8201
440B108
SWITCH, ROTARY: 8-position; single-pole; shorting type. Knob 1201
must be broken to remove S201
S01,
409B121
CONNECTOR ASSEMBLY: consists of two Jones receptacles, one 8-prong
SO2
(S01) and one 7-prong (802)
40
, Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
Ref.
No.
Contractor's
Drawing &
Part Number
JAN Type
Description
S03
409A122
CONNECTOR, PLUG: 6 female contacts
T201
425D137
TRANSFORMER, POWER
V201
ELECTRON TUBE: miniature double diode; RMA type 6X4
SECTION IV. FILTER-ACCESSORY UNIT RA-6
Ref.
No.
Contractor's
Drawing &
Part Number
JAN Type
Description
C301A,
C301B
408B122
CAPACITOR, FIXED, PAPER DIELECTRIC: 2-section; 1.5 x 1.5 uf
600 vdcw
C302
408B106
CAPACITOR, FIXED, PAPER DIELECTRIC: 5 uf; 600 vdcw
F301
465A111
FUSE, GLASS TUBULAR: 1.5-ampere, 250V. Spare for F201
F302
465K112
FUSE, GLASS TUBULAR: 15-ampere, 32V. Spare for F202
HS301
450B101
RECEIVER, EARSET: magnetic type; 2000 ohms impedance; with 2-
terminal receptacle
L301
401V375
REACTOR: filter choke; single winding; 4 hy; includes mtg nuts
0301
442A162
RING, RETAINER (S06, S05 and PL3)
0302
0303
PL3
428A123
CONNECTOR, PLUG: 6 male contacts
R301
418K128
RESISTOR, FIXED, WIREWOUND: 8000 ohms +5%; lOW
R302
418A127
RESISTOR, FIXED, WIREWOUND: 4000 ohms +5%; 5W
R303
418K128
RESISTOR, FIXED, WIREWOUND: 8000 ohms ?5%; 10W
R304
418A127
RESISTOR, FIXED, WIREWOUND: 4000 ohms ?5%; 5W
R305
906R578
RC2OBF105K
RESISTOR, FIXED, COMPOSITION: 1 megohm +10%; MW; ins
S301
440A110
SWITCH, TOGGLE: double-pole, double-throw; 3-amp, 250V
or
440K111
505
409A128
CONNECTOR, PLUG: 6 female contacts
SO6
409A129
CONNECTOR, PLUG; 4 female contacts
SO7
409A157
SOCKET, PROTECTIVE (TWO): used to prevent damage to pins of plugs
W301 and W302
V301
or
ELECTRON TUBE: sub-miniature voltage regulator; JAN type 5644
ELECTRON TUBE: sub-miniature voltage regulator; JAN type 5787
V302
or
ELECTRON TUBE: sub-miniature voltage regulator; JAN type 5644
ELECTRON TUBE: sub-miniature voltage regulator; JAN type 5787
41
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06 : CIA-RDP78-03561A000200060001-2
Ref.
No.
Contractor's
Drawing &
Part Number
JAN Type
Description
W301
401B363
CABLE ASSEMBLY, AC: 2-conductor; with universal line plug and Jones
plug; 6 ft long
W302
401B366
CABLE ASSEMBLY, BATTERY: 2-conductor; one red, one black; with
spade lugs and Jones plug; 41 in. long
W303
430B101
CORD, EARSET: 5 ft long; 2-conductor; with two .083 tips and 2-prong
male plug
W305
464B274
PLATES, schematics (comp)
SECTION V. ADDITIONAL ACCESSORIES
Ref.
No.
Contractor's
Drawing &
Part Number
JAN Type
Description
E301
451B101
HANK, antenna (100 ft)
E302
414A117
INSULATORS, antenna (two)
E303
465A113
LAMP, INCANDESCENT, G.E. TYPE 49: 2v; .06 amp; tubular; clear
glass; bayonet base. Spare for E103
H301
401V376
CLAMPS, battery; with screw (two)
W304
430B143
CORD, INTER-UNIT: consists of two twisted leads, with three Lenz type
#550 connectors and one MUELLER #45 battery clip. To connect side-
tone and antenna to receiver.
42
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
SBATTERY
4.5V
RESTRICTED
APPENDIX I.
LOW RANGE OHMMETER
LOW RANGE OHMMETER
2211
1W
'\AAi
CURRENT
LIMITER
ADJUST FOR FULL SCALE DEFLECTION
WITH OPEN TEST LEADS.
100 MA MOVEMENT ?10
?
TEST LEADS
NOTE I. BATTERY CONSISTS OF THREE I .5V FLASHLIGHT CELLS IN SERIES.
NOTE 2. USE HEAVY GUAGE, SHORT TEST LEADS FOR MINIMUM LEAD RESISTANCE.
NOTE 3. NOTE RESISTANCE OF SHORTED TEST LEADS a SUBTRACT THIS AMOUNT
FROM ALL SUBSEQUENT READINGS AS A CORRECTION FACTOR.
NOTE 4. OPEN SWITCH WHEN NOT IN USE TO PREVENT UNNECESSARY CURRENT
DRAIN ON BATTERY.
NOTE 5. READINGS IN THE METER CALIBRATION TABLE ARE FOR THE ABOVE
CIRCUIT ONLY. IF THE CIRCUIT IS ALTERED THE FORMULA MAY NOT APPLY.
NOTE 6, TO DETERMINE RESISTANCE VALUES NOT LISTED IN TABLE USE THE
FOLLOWING FORMULA
IN \
RmEASURED ( I CX) I m M
WHERE:
IN = METER READING
RN = INTERNAL RESISTANCE OF METER
EXAMPLE:
WHEN METER READING IS 3 MA
3
RMEASURED= 100-3 ) I
RMEA ?03 OHMSURED'
Figure 26. Low range ohmmeter.
RESTRICTED
METER CALIBRATION TABLE *
METER READING
(MA)
RESISTANCE
(OHMS)
0
0
5
.052
10
II
20
.25
30
.42
40
.66
50
1.0
60
1.5
TO
2.3
80
4.0
90
9.0
100
cac)
* VALUES CALCULATED FOR METER
WITH I OHM INTERNAL RESISTANCE.
( WESTON MODEL 301)
43
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
MEMO
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2
'OP
--11UNNIPECF 468Plot
Declassified in Part - Sanitized Copy Approved for Release 2013/08/06: CIA-RDP78-03561A000200060001-2