INSTRUCTION BOOK FOR RADIO EQUIPMENT RS-1

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03561A000200070003-9
• Release Decision: RIFPUB
• Original Classification: S
• Document Page Count: 80
• Document Creation Date: December 23, 2016
• Document Release Date: July 8, 2013
• Sequence Number: 3
• Publication Date: January 28, 1958
• Content Type: MISC

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?uNLy
WARNING
The voltage used in this equipment
may be FATAL
Dangerous voltages exist on the pins
of the transmitter and receiver power
sockets of the RP-1 and RP-2.
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TABLE OF CONTENTS
PAGE
GENERAL DESCRIPTION 1
A. TECHNICAL SPECIFICATIONS
1. TRANSMITTER, RT-3 1
2. RECEIVER, Blis.2 2
3. POWER SUPPLY, EP-1 4
4. POWER SUPPLY, RP-2 5
5. ACCESSORIES 6
6. BATTERIES 7
B. OPERATING INSTRUCTIONS
1. INSTALLATION 12
2. ANTENNAS 12
3. CRYSTALS 14
4. OPERATION 15
C. MAINTENANCE
1. TRANSMITTER 27
a. CIRCUIT L-SCRIFTION 27
b. TROUBLE SHOOTING 28
c. LIST OF ELECTRICAL COMPONENTS 35
2. RECEIVER 37
a. CIRCUIT DESCRIPTION 37
b. TROUBLE SHOOTING 40
c. LIST OF ELECTRICAL COMPONENTS 50
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TABLE OF CONTENTS (CONTINUED)
PAGE
C. MAINTENANCE
3. POWER SUPPLY, EP-1 53
a. CIRCUIT DESCRIPTION 53
b. TROUBLE SHOOTING c7
c. LIST OF ELECTRICAL COMPONENTS 67
4. POWER SUPPLY, RP-2 69
a. CIRCUIT DESCRIPTION 69
b. TROUBLE SHOOTING 70
c. LIST OF ELECTRICAL COMPONENTS 74
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INDEX TO LIST OF ILLUSTRATIONS
FIGURE TITLE PAGE
1 PANEL VIEW OF TRANSMITTER, RT-3 8
2 PANEL VIEW OF RECEIVER, RR-2 9
3 PANEL VIEW OF POWER SUPPLY, RP-1 10
4 PANEL VIEW OF A.C. POWER SUPPLY, RP-2 11
5 EXTERNAL WIRING OF RS-1 22
6 STATION SET UP FOR A.C. MAINS OPERATION WITH RP-1 23
7 STATION SET UP FOR A.C. MAINS OPERATION WITH RP-2 24
8 STATION SET UP FOR STORAGE BATTERY OPERATION 25
9 STATION SET UP FOR HAND GENERATOR OPERATION 26
10 TRANSMITTER, RT-3, PEAR VIM, (CASE REMOVED) 33
11 SCHEMATIC OF TRANSMITTER, RT-3 34
12 RECEIVER, RR-2, REAR VIEW (CASE REMOVED) 48
13 SCHEMATIC OF RECEIVER, PR-2 49
14 POWER SUPPLY, EP-1, REAR VIE14 (CASE REMOVED) 61
15 SIMPLIFIED SCHEMATIC OF PP-1 FOR A.C. MAINS OPERATION 62
16 SIMPLIFIED SCHEMATIC OF RP-1 FOR 6 VOLTS D.C. OPERATION 63
17 SIMPLIFIED SCHEMATIC OF RP-I FOR HAND GENERATOR OPERATION 64
18 SIMPLIFIED SCHEMATIC OF RP-1 FOR BATTERY CHARGING 65
19 SCHEMATIC OF POWER SUPPLY, EP-1 66
20 SCHEMATIC OF POWER SUPPLY, RP-2 73
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RADIO STATION RS-1
GENERAL DESCRIPTION
The RS-1 is a portable, medium and long range, radio station complete
in four waterproof containers. It is designed to provide reliable operation
over a wide range of climatic conditions and to possess a "long shelf life"
storage characteristic. It is intended to operate from a variety of primary
power sources and over a wide range of input voltages. The RS-1 is prim-
arily intended for manual C.W. operation by persons having only a rudi-
mentary knowledge of the technical phases of radio communication.
The RS-1 consists of the following basic items of equipment:
1. Radio Transmitter, RT-3
2. Radio Receiver, RR-2
3. Power Supply, RP-1 or RP-2
4. A kit containing the operating spares and accessories.
In addition to the units above, various other items for special
applications may be supplied, the details of which are beyond the scope
of this manual. The approximate weight of the items listed, when packed
for transport, will be from 40 to 55 pounds depending upon the type of
power supply issued.
A. TECHNICAL SPECIFICATIONS
A-1. Transmitter RT-3
Frequency Range: 3-22 megacycles in 4 bands
Frequency Control: Quartz crystals cut to the fundamental,
one half or one third the desired output
frequency. Crystal input capacity is
approximately 18 mmf.
Mode of Emission: C.W. Morse code 41)
11664121EF
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"
Power Input: 400 volts D.C. at 100 milliamperes
6 volts A.C. or D.C. at 1.2 amperes
Power Output: 12 - 15 watts, 3 - 15 megacycles
10 - 12 watts, 15 - 22 megacycles
Antenna Matching: Any single wire system having an impedance
of 72 to 1200 ohms, zero phase angle and
from 72 to 600 ohms with a phase angle not
exceeding plus or minus 450
Break in Operation: An automatic switching circuit is provided
to allow the receiver to use the trans-
mitting antenna.
Operating Conditions: Temperature minus 15? C. to plus
(minus 55? C. for storage)
Tube Compliment: 1 - 6AC7
1 - 2E26
Outer Case Material: Magnesium alloy, heat treated with a non-
corrosive base finish
Overall Dimensions: 8- 5/8inches x 5-0 inches x 5-7/16 inches
Weight: 9 pounds
Waterproofing: Unit is waterproofed and tested to a pressure
of 7-0 pounds per sq. inch with or without
top cover. A replaceable "tell-tale" desiccator
cartridge is provided.
550C.
A-2. Receiver RR-2
Frequency Range: 3-24 megacycles in 3 bands
Frequency Control: Continuous tuning local oscillator or spot
frequency operation from a quartz crystal.
Crystal input capacity is approximately 26 mmf.
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Mode of Reception: Amplitude modulated signals or continuous
wave Morse code.
Power Input: 1.3 - 1.5 volts D.C. 300 milliamperes and 90-108
volts D.C. it 20 milliamperes
Power Output: 30.mi1liwatts into 4,000 ohm load
Sensitivity: Not over 20 microvolts, 30/0 modulation, for 20
milliwatts output. 10 DB signal to noise ratio less
than 1.5 microvolts C.W. and 2 microvolts A.M.
Selectivity: The average overall selectivity is 8 KC at 10
times down from normal signal and 15 KC at 100
times down throughout the range from 3-24 MC.
Image Ratio: The image rejection ratio is not less than 35 DB
at 24 MC, rising to better than 60 EB at the
lowest frequency, 3 MC.
Calibration: Directly calibrated dial in megacycles plus a
zero to 180 logging scale operating in conjunction
with a vernier control giving 1800 logging dial
divisions per band. Direct calibration accuracy
not less than .00.
Beat Frequency Oscillator: The beat frequency oscillator is
variable plus or minus 4 KC from
center I.F. frequency of 455 KC.
Operating Conditions: Temperature minus 15? C. to plus 550 C.
(minus 550 C. for storage)
Tube Compliment: 4 - 1T4
1 - 1L6
1 - 1U5
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Outer Case Material: Magnesium alloy, heat treated with a non,-
corrosive base finish
Overall Dimensions: 8 5/8 inches x 5 1/2 inches x 5 7/16 inches
Weight: 10 pounds
Waterproofing: Unit is waterproofed and tested to a pressure of
7 1/2 pounds per sq. inch with or without top
cover. A replaceable "tell-tale" desiccator
cartridge is provided.
A-3. foyer Supolv RF-1
Power Input: 75-260 volts A.C., 40-400 cycles
6 volts D.C. e 13 amperes (key down)
Hand cranked generator input provided for hand
generator type SSP-11.
Power Output: 1.3 volts D.C. 40 300 milliamperes regulated to
within 1 7%
100 volts D.C. @ 20 milliamperes regulated to
within 1 1%
(The above regulation is tor mains variations of
plus or minus 20 volts).
00 volts D.C. @ 100 miliiamperes
6.3 volts A.C. 5 1.5 amperes (6 volts D.C. when
on battery operation)
3-4 amperes D.C. for charging a 6 volt storage
battery.
Metering: A 0-300 volt A.C. meter is provided to permit input
to be adjusted for proper A.C. mains voltages.
Fusing: Two fused circuits are provided. A two ampere fuse
for the A.C. input and 20 ampere fuse for the 6 volt
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Operating Conditions: Temperature minus 15? C. to plus 55? C.
(minus 55? C. for storage)
Tube Compliment: 1 - 0132 voltage regulator (all rectifiers
and other regulators are of the selenium
stack type)
Outer Case Material: Magnesium alloy, heat treated with a non-
corrosive base finish
Overall Dimensions: 10 inches x 8 1/2 inches x 5 1/2 inches
Weight: 24 1/2 pounds
Waterproofing: Unit is waterproofed and tested to a pressure
of 7 1/2 pounds per sq. inch with or without
top cover. A replaceable "tell-tale" desiccator
cartridge is provided.
A-4. .E.Q.Lielp_p_11.1-
Power Input: 75-260 volts A.C., 40 to 400 cycles
Power Output: 1.3 volts D.C. 0 300 milliamperes regulated to
within plus or minus 7%.
100 volts D.C. 0 20 milliamperes regulated to
within plus or minus 1%.
(The above regulation is for a mains variation
of plus or minus 20 volts).
Metering: 400 volts D.C. 0 100 milliamperes
6.3 volts A.G. 0 1.5 amperes
Fusing: 2 ampere A.G. input fuse
Operation Conditions: Minus 15? C. to plus 550 C. (minus
55? C. for storage)
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Tube Compliment: 1 - 0B2 voltage regulator, (all rectifiers
and other regulators are of the selenium
stack type).
Outer Case Material: Magnesium alloy, heat treated with a
non-corrosive base finish
Overall Dimensions: 8 5/8 inches x 5 1/2 inches x 5 7/16 inches
Weight: 12 pounds
Waterproofing: Unit is waterproofed and tested to a pressure
of 7 1/2 pounds per sq. inch with or without
top cover. A replaceable desiccator cartridge
is provided.
A7-5. Accessories
The accessories and field spares are packed in a water-
proof box having a quick release lid. Some of the less destruct-
able accessories as antenna wire, glass insulators, ground clamps,
etc. may not be packed within this box but will be included within
the packing or carrying container for the complete equipment.
Dimensions of Spare Parts Box: 11 1/2 inches x 3 5/16 inches x
5 1/2 inches
Weight of Spare Parts Box Packed: 6 pounds
List of Accessories: 1 - 2E26 Tube 1 - 6AU7 Tube
4 ? 1T4 Tubes 1 - 1L6 Tube
1 - 1U5 Tube 1 - 0B2 Tube
2 - Panel lamps #47
1 - Set fuses
1 - Set, headphones
1 - Vibrator (with FP-1 only)
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f?'?
1 - Spare If. V. filter capacitors
1 - Set wrenches for water tight seals and
knobs
1 - Lamp base adaptor
1 - 100 ft. coil rubber covered wire
1 - 25 ft. soil rubber covered wire
1 - "C" type ground clamp
4 ? Antenna insulators
1 - Screw/bayonet base adaptor
Datteries
The receiver may be operated from a dry battery pack of the
1 1/2 volt "A" and 90 volt "B" variety, instead of the RP-1 or
RP-2 power supplies.
Typical Dry Batteries
Military: BA-48
Commercial: 41160 Burgess VS041 R.C.A.
51)160 Burgess VS054 R.C.A.
61160 Burgess
The transmitter and receiver may be operated from a 6 volt
storage battery, when the BP-1 power supply is supplied. The
power drain is about 13 amperes (key down) and about 5 amperes
key up. This heavy drain requires the use of a heavy duty battery,
preferably 100 ampere hour capacity and never less than 60 ampere
hour.
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PANEL VIEW OF RECEIVER RR-2
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1N IN
? /
130
IDION WON ONLY
10011100 MANI GENERATOR
FIGURE 3 PANEL VIEW OF POWER SUPPLY RP-1
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WATTS
NT-
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TAMIL AOSIAL
VlLT$LC* AL
NtIS LtGAMMA.
LL.1.511P.
FIGURE 4 PANEL VIEW OF A.C. POWER SUPPLY RP-2
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B. OPERATING INSTRUCTIONS
B-1. nstall (See figure 5)
The RS-1 may be packed in a wide variety of containers and
no specific instructions for unpacking can be given. Try to avoid
scratching of the outer cases with sharp instruments or the non-
corrosive finish may be damaged. The four units should be placed
on a flat surface before attempting to remove the covers. The
covers may be removed from the transmitter, receiver, and power
supply by rotating the corner screws in a counter clockwise
direction. These screws will not come free from the cover as they
are fitted with retaining washers. If the units have been stored
over a long period of time it may be necessary to pry off the covers
by inserting of a thin knife blade, taking great care not to damage
the sealing gasket.
It is recommended that the units not be operated within the
packing or carrying case but rather on a table or other level
surface. Leave as much space between units as the interconnecting
cords will allow. This will improve the cooling of the units
which will become quite warm, especially if operated continuously
over long periods of time.
Examine the units carefully and study this manual thoroughly
before proceeding further.
B-2. iatenna Systems
The RT-3 transmitter will put energy into almost any type of
antenna. Putting energy into an antenna, however, does not
necessarily mean that it will effectively radiate that energy.
To provide reliable communication over long distances, an
efficient antenna is essential. (See figure 5)
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0 EA, 11,r...s
Supplied with the HS-1 are two coils of rubber covered wire,
one a 100 foot length and the other a 25 foot length. In addition,
will be found some small strain insulators and a metal pipe clamp.
The ideal situation would permit installing the entire 100 foot
length of wire as an inverted "L" antenna, making the "flat top"
portion approximately 60 to 70 feet long and suspended 30 to 40
feet above the ground. The remaining length of wire would then
serve as a "lead in" connection to the transmitter and receiver.
Actually, fairly good results may be obtained using any combination
of "flat top" and "lead in" length, provided the total length of
100 feet is used and the "flat top" is as high as possible. Do
not run the antenna directly underneath or close to power lines
or telephone wires, but try to keep it as far from surrounding
objects as possible. If, for one reason or another, it is im-
possible to install the entire 100 foot length of wire, a shorter
antenna may be used, following the rule of "as high as possible
and free from surrounding objects". hemember, the shorter the
antenna, the less effectively it will radiate the power of the
transmitter. This is especially true for the lower frequencies.
At no time should an antenna shorter than 1/4 of a wavelength be
used. The shorter the antenna, the more important becomes the
ground connection. The following table gives recommended minimum
lengths of antenna for various frequencies.
Lre111-9--Paa.-111-8g.
3 to 5 75 ft.
5 to 7 50 ft.
7 to 9 35 ft.
9 to 22 25 ft.
SVCRPT
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Voltage fed antennas, that is antennas whose electrical wave
length is equal to an even multiple of 1/4 wave lengths, may be
difficult to load. If difficulty is experienced in loading any
particular antenna, merely lengthen (or shorten) the antenna about
10 per cent. This may usually be done by adding a short piece of
wire in series with the antenna lead-in wire.
A "good ground" connection, with the lead wire as short as
possible, is desirable when operating from A.G. mains, and abso-
lutely essential when operating from a storage battery or hand
cranked generator. A good ground may be obtained by attaching the
ground lead wire to a cold water pipe with the ground clamp. An
alternate solution would be to drive a piece of water pipe, 4 to 6
feet in length into the ground and then periodically saturate the
area around the pipe with water. If neither of these methods for
obtaining a good ground can be used, a counterpoise must be in-
stalled. A counterpoise is one or more extended lengths of wire
connected to the ground terminal of the transmitter and placed on
the ground beneath the antenna "flat top". The length of the
individual wires of the counterpoise should not be less than 75
to 100 feet.
firyslas
The crystals to be used in this transmitter should be of the
"fUndamental cut" type but their basic frequency may be equal to,
or one half, or one third the desired operating frequency. Example:
Suppose operation on 16,780 KC is desired. A 16,780 0 crystal is
not recommended because of its fragility. Since it is possible to
use one half or one third the output frequency, a crystal cut to
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8,390 KC or 5,861.66 KC will give satisfactory operation. Actually
slightly better performance is obtained by avoiding the use of
crystals cut to one times the output frequency. The following rule
for selecting the proper crystal may be set up, although other
choices are possible:
3 to 7 MC - crystals equal to or 1/2 times output
frequency.
7 to 14 MC - crystals of 1/2 times output frequency.
14 to 22 MC - crystals of 1/2 or 1/3 times output
frequency.
Note: (Crystals equal to 1/4 the output frequency may be used
with somewhat reduced output power).
Sockets are provided to accomodate either 1/2 inch or 3/4 inch
crystal pin spacing.
8-4. Operation
8-4a. A.C. Mains Operation (See figure 6)
As shown in the technical specifications there are two types
of power supplies for this equipment. Normally only one type,
depending on the operational circumstances, will be supplied. The
RP-1 is the larger universal type, whereas the RP-2 is a more
compact unit but is designed for operation from A.C. mains only.
The first step in operating the RS-1 from A.C. mains is to make
certain that (1) the mains power is alternating current, Ligt_dirept
current and (2) that the A.C. frequency is not lower than 40 cycles
zeZ secOnd. This can be determined by examing electrical appliances
which may be used in the building or in nearby buildings. Normally,
all electrical appliances carry a manufacturer's rating on a label
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specifying voltage voltage and line frequency. If any doubt exists as to
the characteristics of the mains power, make inquiries and find out
since application of direct current or low frequency A.C. (25 cycles)
may damage the equipment.
Power supplies RP-1 and RP-2 come equipped with a special
universal A.C. power plug and lamp base adaptor. The proper choice
of plug pin size or adaptor may be made by inspection of the mains
outlet to be used. If a wall or floor receptacle is available, the
universal plug alone would be used. If an electric lamp socket is
the only power outlet available, then the lamp base adaptor must be
used. This adaptor will fit into either bayonet or screw base lamp
sockets, thus providing a receptacle for the universal plug.
The transmitter and receiver should now be plugged into their
proper sockets on the power supply and the telephone head set con?
nected to the appropriately marked terminals on the receiver. It is
assumed that paragraphs B-2 and B-3 have been studied, that the
antenna and ground have been installed, and that a crystal of the
proper frequency is available. Antenna and ground connections
should be made to the transmitter and receiver only as shown in
figure 5.
Before plugging the power supply into the A.C. power outlet,
make certain that the voltage selector knob is in the "off" position,
and the "charge-operate" switch is in the "operate position". With
the power supply in the "off" condition, the panel A.C. voltmeter
will indicate the power line voltage. Rotate the voltage selector
knob in a clockwise direction to the voltage setting most closely
corresponding to the meter indication. Do not turn the knob past
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this position or the equipment may be damaged.
To place the transmitter in operation, set the control knobs
(1), (2), and (3) to proper setting, according to the tuning chart
on the panel. Set the control knob (4) to the tune position.
Press the telegraph keys and adjust control knobs (2) and (3) for
maximum brilliance in the two small glow lamps adjacent to each
of these controls. Rotate knob (4) slowly, first counter clockwise
and then clockwise, at the same time readjusting (3) to obtain
maximum brilliance of the antenna current lamp. The maximum bril-
liance of the antenna current lamp is subject to a wide variation
depending on the antenna length and the frequency in use. A barely
perceptible glow is as effective as full lamp brilliance provided
each is the maximum for the particular antenna and frequency. In
some cases where the current indication is small, the initial load
adjustment may be made by watching the light decrease in the glow
lamp adjacent to control knob (3)when knob (4) is rotated toward the
maximum load position. Knob (3) should be readjusted to give maximum
brilliance in the glow lamp each time knob (4) is adjusted. After
this method has obtained a perceptible glow in the antenna current
lamp, readjust for maximum brilliance as already outlined. When
no further adjustment of (3) and (4) produces any greater brilliance
of the antenna current lamp, knob (2) may be adjusted very slightly
to obtain the optimum output as indicated by the antenna current
lamp. This final adjustment of (2) is important, especially if
crystals of one times the output frequency are being used.
The operation of the receiver is relatively simple. Select
the proper frequency band by rotating the range switch. Set tuning
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dial to the frequency desired and turn receiver "on" by rotating
the volume control in a clockwise direction until a soft rushing
noise is heard in the phones. If Morse code signals are to be
received, the "8.F.0." control must be rotated to the "on" position.
Do not depend on the dial calibration alone to find a station
of known frequency. Rotate the tuning knob slowly, tuning the
receiver to a slightly higher frequency than the frequency desired.
Repeat this process tuning to a slightly lower frequency. Continue
back and forth until the station is heard and properly tuned in.
In this manner slight errors in the receiver dial calibration can
be overcome. If a Horse station is being received, fine tuning
may be accomplished with the B.F.O. knob. Once a station has been
tuned in on the receiver, it may be accurately logged using the
top numerical scale on the dial together with the tuning knob
vernier. If it is necessary to find this station again, write
down the dial readings. This will save much time, and help to
provide fast efficient operation.
To use the receiver for "spot" frequency reception, merely
plug an appropriate crystal into the crystal socket on the panel.
The main tuning dial should be set to the frequency to be received
and adjusted slightly to provide maximum sensitivity. The only
variable frequency control is by means of the B.F.O. which will
tune over a very small range serving mainly as a pitch control of
the received signal. The crystals for use in the receiver must
be of the F-243 type (1/2 inch pin spacing). Their frequency may
be equal to, or one half, or one third the desired flauktra
;renitence% The control frequency jnotbe ?ivinguenc ".
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.L 7iajj t, 11.1i
To obtain the crystal frequency for a given "receiving frequency*,
add or subtract 455 IC from the "receiving frequency". This gives
us the "control frequency". The crystal can now be selected as
equal to, or one half, or one third this "control frequency". For
convenience in operation, receiving crystals should be marked
"receiver", and stamped with the proper "receiving frequency". The
recommended rule for selecting crystals is applied in terms of the
"control frequency" as follows:
2.5 to 7.5 MC -- crystals equal to the "control frequency"
7.5 to 14.5 MC -- crystals of 1/2 times the "control frequency"
14.5 to 24.5 MC -- crystals of 1/3 times the "control
frequency".
jjacjj_?ant: Crystal must be correlated for use in this equipment
or serious errors in the receiving frequency may result. (See A-2,
Frequency Control). Always specify receiver type, serial number,
and xeceivingf,LemtpAsy when ordering crystals!
B-4b. Storage Batt,ry Qperatiop (See figure 8)
This section is only applicable when using the RP-1 power
supply. A heavy duty automobile type, 6 volt storage battery is
required. In operating the RS-1 from a storage battery) the RP-1
power supply voltage selector knob should be placed in the "aff"
position. The battery cables may then be clipped to the battery
terminals. Be sure to observe the polarity of the leads, the red
clip to positive or plus battery terminal, and the black clip to
the negative or minus terminal. To operate turn the voltage
selector switch to "battery". All adjustments to transmitter and
receiver are then identical to those described under B-4a.
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To charge a 6 volt battery with the RP-1 power supply plugged
into the A.G. mains, it is only necessary to place the *charge-
operate" switch in the charge position, and adjust the voltage
selector knob for the correct A.C. line voltage, as outlined in
B-4a. When charging the battery, it may be well to loosen the
filler caps on the cells to allow a free discharge of gas. Be cer-
tain that the electrolyte level is above the plates. For longest
battery life replace water with distilled water; however, ordinary
tap water may be used in emergencies. To change from battery
charging to A.G. mains operation, having been once set up, it is
only necessary to throw the charge-operate switch to the "operate"
position.
B-4c. apdge__,..e..._kr.Spig.?-s=smnra (See figure 9)
The RS-1 is designed to operate at somewhat reduced power from
a band cranked generator type SSP-11 (modified GN-r58). There are
two ways that this type of operation can be obtained; one, with the
receiver operating from a small dry battery pack and the transmitter
plugged directly into the hand generator; or two, by going through
the 1P-1, the dry battery may be eliminated. (The RP-2 power supply
does not contain this feature.)
The first method is the most desirable since it requires the
least amount of equipment (eliminates the RP-1) and the crsnking
load is reduced considerably since the generator need only be
cranked while transmitting.
The second method is, of course, required where there can be
no resupply of dry batteries. To operate with the second method,
plug the hand generator power cord into the hand generator input
SECPvm
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-21- SECRET
socket on the RP-1 And plaoe the voltage selector knob in the
position. This knob remains in the "off" position during operation
from the hand generator. The generator input cover cap must be in
place during all other modes of operation or the power supply will
not function.
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Guy i-v/,ez-_,
OR ROPE
STRAIN
INSULATOR
FLAT 70A' 60 - 70 64--
6YOLT BATTERY
LEAD /N 30-4017-
COMMON ANTENNA
HOOK- UP
SEPARATE RECEIVING
ANTENNA HOOK-UP
THESE LEADS
TO BEAS
SHORT AS
POSJIBLE
7W/S JUMPER
MUST BE /N "LACE
WHEN LATING A
SEPARATE RE -
CE/Y/NG ANTENNA.
25 FT 0,e LES:
FIG 5 TYPICAL EXTERNAL WIRING OF. R S -I
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^VII
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FIGURE 6 STATION SET UP FOR A. C. MAINS OPERATION WITH RP-1
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FIGURE 7 STATION SET UP FOR A.C. MAINS OPERATION WITH RP-2
SECRET
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FIGURE 8 STATION SET UP FOR STORAGE BATTERY OPERATION
sprPRT
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SEC] Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070003-9
Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A0002000750-03797
U. MAINTENANCE
C-1. Transmitter._ RT-3
C-la. Circuit Description (See figure 11)
Radio transmitter RT-3 is a miniature two stage crystal con-
trolled C.V. transmitter having a frequency range of 3 to 22 MC.
The crystal oscillator utilizes a type 6AC7 tube in a combin-
ation Pierce oscillator and radio ftequency amplifier/multiplier
circuit. In this circuit arrangement the control grid and screen
grid perform the functions of an =tuned Pierce oscillator and the
plate circuit is electron coupled to the oscillator section. Reso-
nance in the oscillator stage is indicated by neon lamp Ni.
The output of the oscillator is capacitively coupled to the
grid of type 2E26 tube used as a power amplifier. The plate circuit
of the 2E26 is a combination tank and antenna matching network.
Plate circuit resonance is indicated by neon lamp N2. The output
or loading variable capacitor C16 is arranged to rotate through
approximately 3450. When C16 is set in the "tune" position SW2 is
closed which parallels capacitor Cl5 with C16 giving a total capacity
of 380 mmf. Rotating C16 to the stop in the "Low;" position re-
duces the total capacity to about 200 mmf. By turning C16 to the
stop in "High Z" position, the minimum capacity is reduced to
approximately 20 mmf. Actually as soon as C16 Is rotated into the
"High Z" range, SW2 opens disconnecting C15. This arrangement
gives a continuous adjustment of output capacity from 20 to 380 mof.
and thus permits proper power amplifier adjustment over a wide
range of antenna impedances. Antenna current is indicated by a
miniature lamp (shunted by a 20 ohm resistor) placed in series
with the antenna.
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SECRET
Keying is accomplished by breaking the cathode returns on
both the 6AC7 and 2E26. Capacitor C5 together with resistor h5
provide a key click filter.
Break in operation is accomplished by providing a receiver
antenna terminal on the transmitter panel which is connected to
the transmitting antenna through C14. With the key in the up
position, the receiver antenna terminal is free from ground being
effectively isolated by choke coil 1FC2. With the key in the down
position, the receiver antenna terminal is shorted directly to
ground. This prevents the output of the transmitter from being
fed into the receiver. The receiver antenna circuit is isolated
from D.C. by capacitor C4. At the lower frequencies, say below
5 MC, slightly better receiver performance is obtained, if a
separate receiving antenna is used. When using a separate antenna,
be sure that a short wire jumper is connected between the receiver
antenna terminal on the transmitter and the ground terminal.
Failure to do this, reduces the effectiveness of the key click
filter.
Do not use a single antenna with the receiver connected to
the transmitter if an external telegraph key is to be used. The
loop impedance of the leads to the key may allow enough R.F. voltage
into the receiver to cause damage to the first tube and antenna coil.
An external key is not recommended if maximum freedom from key
clicks is important.
C-lb. Trouble Shoptin The ItT-1
No trouble should be experienced in servicing this unit. It
is extremely simple in design and the only test instruments required
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are a 20,000 ohm per volt volt-ohmr-milammeter and a 25 watt 115
volt electric light bulb. When removing the transmitter from its
ease, be very careful not to damage the coils in the oscillator
stage. Inspect these coils before reassembly for shorted turns.
The first step in attempting to service an inoperative RT-3
is to check the output of the Power Supply RP-1 or RP-2 with the
transmitter and receiver disconnected. If voltages are normal,
(see RP-1 and RP-2 voltage charts) then plug in receiver. If
receiver is drawing normal power, there should be change in
transmitter supply voltage at the output of the power supply.
After disassembly of the RT-3 from the case, plug into power supply
and measure plate supply voltage at the junction of resistors Rbo,
R7 and R10, Ell. This voltage should measure between 390 and 420
volts (key down). If this voltage appears normal, the tubes
should be checked, one at a time by substitution with a new tube
of the same type. Always retighten the tube clamps after replacing
tubes. If changing tubes does not correct the condition, a point
to point check with the voltmeter should be made according to the
following voltage chart:
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Test Condition: Key up, A.C. mains operation, using RP-1, Power Supply.
V!1. i647) Voltage Reading V-2 (2F.26) Voltage Reading
__Sfo_Cluags to Chassis
Pin 1 0 volts A.C. Pin 1 465 volts D.C.
" 2 0 " n a * 2 0 volts A.C.
if 3 465 volts D.C. " 3 4510 volts D.C.
4
5
? 6
if
7
0 "
+65 "
451.0 11
? ff
N"
N
4
5
" 6
465
^ N
0 N
465
ft N
6.3 volts A.C. ^ 7 6.3 volts A.C.
? 8 4510 volts D.C. ? 8 ^ n n
Plate Cap 4510 volts D.C.
Test Condition: Key down, fully loaded, A.C. mains operation.
N-1 (6AC7) Voltage Reading V-2 (2E26) Voltage Reading
o CIrssis o_Shapa,i_s_
Pin 1 0 volts D.C. Pin 1 450 volts D.C.
" 2 0 volts A.C. n 2 0 volts A.C.
w 3 47.5 volts D.C. " 3 +260 volts D.C.
w 4 Do not check N 4 450 "
" 5 47.5 volts D.C. w 5 Do not check
w 6 Do not check w 6 450 volts D.C.
" 7 6.3 volts A.C. " 7 6.3 volts A.C.
w 8 Do not check " a o * * *
Plate Cap Do not check
Note: These are average voltages only and varietions up to 15%
are normal.
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Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070003-9 RET
The following is a list of possible troubles and the causes thereof:
aapjap Probable Causes
1. No plate voltage on Vi. Ll or L2 open, R6 and R7 both
open, C7 shorted.
2. No screen voltage on Vi. RFC1 open, R4 open, R6 and R7
open, C7 shorted, C3 shorted.
3. No plate voltage on V2 R12 open, contacts on SW1B not
closing, C15, Cll shorted.
4. No screen voltage on V2. R10 and R11 both open, C10 shorted.
5. No change in plate or screen RFC2 open.
voltages with key up or down.
6. Transmitter on continuously, C5 shorted.
key has no effect.
7. Keying sluggish or chirpy Low activity crystal, C6 not
adjusted properly, defective
6AC7 tube.
8. Antenna will not load Burned out antenna current lamp,
antenna may be exactly 1/2 wave
? length giving little or no in-
dication in lamp. (See B-4).
9. All voltages appear normal and Weak 6AC7 tube, low activity
transmitter tunes up well but crystal.
output on higher frequencies is low.
10. Transmitter is unstable C10 or Cll open, chassis ground
(Check for output with crystal springs not making contact at
removed), sides of case.
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SEC RE T
The 25 watt lamp with a pair of short leads soldered directly
to the base makes a good dummy antenna for checking transmitter
output, without putting a signal on the air. This lamp should
light to nearly full brilliance on ranges one, two, and three,
and drop to about half brilliance at the extreme end (22 MC) of
range 4.
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-33-
SECRET
FIGURE 10
SECRET
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Ci I( 0015 MFD
V,
Sal SO2 SAC?
0 0
CRYSTAL
ONTO
P.
KEY 0
2
RGVR.
ANT.0
P3
47K
R2
300
RIGHT ANGLE DnivE
Go
i8
1,2
G2
.01 O.
Ni
1/25
122
RFC,
NH
c.
,
C6
03
110 04
"IA
R3
55 MEG
L1
R4 47K
C7
003 MF
R6
RfC,,
MH
R,
15K ISK
I(
G4 . CI NI FO
0 0
RFG2
I MN
C5
10
MFD
R5
10K
V2
2E^6
C,
01
MFD
iN2 25
G, 2
140
o
C 10 _i 1
H in
i 1
in
.003 MFD I
40K
40K
1
"2
1/25
s
(LEAD
CAPACITY,
3
NOTE:
I. ALL CAPACITANCES IN
IMF. UNLESS OTHER-
WISE SPECIFIED.
2 ALL RESISTANCES IN
OHMS
SO3
RFC3
25 MND
4 ?
, CII
I T003MFD
0138
005
MFD.
c,,
Is
B+
30
NG ? NC
I ? 05 r-
? PL
C15
180
SW2
LIMP,"47
R1320
200
ANT
P4
?CND
Ps
FIGURE 11
SCHEMATIC OF
TRANSMITTER RT-3
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C-1c. List Qt Eles:trical Components for Radio Transmitter. RT.A
SYMBOL REM QUANTITY
Resistors
Res. - 47,000 Ohm 1/2 W 2
R5 Res. - 10,000 Ohm 1/2 W 1
R-8 Res. ? 2,200 Ohm 1/2 W 1
Res. ? 5.6 Megohm 1/2 W 1
Res. - 300 Ohm 1 W 1
Rp-12 Res. - 24 Ohm 1 W 1
R-10, R-11 Res. - 39,000 Ohm 2 W 2
R-7 Res. - 15,000 Ohm 2 W 2
Br.9A, R-98 Res. - 560 Ohm 2 W 2
Res. - 20 Ohm 1 W 1
Capacitors
C-13A, C-138 Cap. - .005 mmf. 500 volt D.C. Mica 2
C-9, C-4, C-2 Cap. -..01 mmf. 500 volt D.C. Mica 3
C-3 Cap. - 22 mmf. 500 volt D.C. Mica 1
C-1 Cap. - .0015 mmf. 500 volt D.C. Mica 1
C-14, C-8 Cap. - 18 mmf. 500 volt D.C. Mica 2
C-10, C-11,
C-7 Cap. - .003 mmf. 500 volt D.C. Mica 3
C-15 Cap. - 180 mmf. 500 volt D.C. Mica 1
C-5 Cap. - 10 MFD-70V Electrolytic 1
C-6 Cap. - 140 mmf. Variable 1
C-I2 Cap. - 140 mmf. Variable with Back Plate 1
C-16 Cap. - 200 mmf. Variable 1
Miscellaneous
Oscillator Plate Coil, Ranges #1 and #2 1
L-2
? ft
" #3 and #4 1
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JR.EJ
List of Electrical Components for Radio Itanamitter, RT-3 (Continued)
SIMBOL
L-3
L-4
SW-U, SW-13,
SW-1C
RFC-1, RFC-4
RFC-3
RFC-2
K-1
LMP #I
N-1, N-2
SO-2
SO-3
IT
Amplifier Plate Coil, Ranges #1 and #2
Amplifier Plate Coil, Ranges #3 and #4
Bandswitch #163C-Modified
Radio Frequency Choke - 1MH 50,4&
Radio Frequency Choke - 2.5 MH 125 MA
Radio Frequency Choke - 1MH 100 MA
Key Assembly
Pilot Light Cap Assembly
Neon Lamp Assembly
Small Crystal Socket Assembly
Large Crystal Socket Assembly
Lamp Socket Assembly
I.
2
1
1
1
1
2
1
1
1
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C-2. Badigjeceiver. RR-2
C-2a. Circuit Description (See figure 13)
Radio Receiver, RR-2 is a miniature communications receiver
of the superheterodyne type, having a frequency range of 3 to 24 MC.
It is capable of high performance operation with continuously
variable tuning or spot frequency crystal control.
The receiver is constructed in a conventional manner except
that two separate chassis are mounted behind the panel. The
larger chassis, upon which the three section tuning capacitor is
mounted, contains all of the component: for the R.F. amplifier,
mixer, and H.F. oscillator. The smaller chassis contains the I.F.
amplifier, second detector, A.F. amplifier, and beat frequency
oscillator.
The following is a step by step function of the stages in
the receiver: The antenna is applied through S1 to the primary
of Ll, L2, or L3, depending on the range in use. The secondary
for that particular range is selected by 52 and connected to the
grid of V1 the R.F. amplifier. 53 shorts out the grid coils of
the ranges not in use. C10 is the R.F. section of the main tuning
capacitor C10, C11, C12 and resonates the secondary of Ll, 12, or
1.3 to the desired signal frequency. 54 switches in the proper plate
coil for V1 and C11 tunes it to the same frequency as the input
circuit. S5 shorts out the plate coils of the ranges not in use.
This comprises the tuned R.F. amplifier with both input and
output circuits of V1 tuned to resonance. Each coil has a all
air trimmer in shunt for adjusting the minimum circuit capacity.
In addition each coil has a powdered iron core which may be
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adjusted to provide exact control of the individual inductances.
The gain in this stage is controlled by a variable negative voltage
.applied to the grid of V1 through resistor Rl.
The output of the R.F. amplifier is capacitively coupled to
the control grid of V2 through C20. The grid return of V1 is
directly to B minus through R4. The B.F. oscillator uses coils
L7, L8, and L9 in a conventional tuned grid, inductively coupled
plate, feed back circuit. The proper grid and plate coil for the
range in use is selected by 87 and S8. S6 shorts out the grid coils
of the ranges not in use. Individual control of inductances and of
minimum circuit capacitance is provided in the same manner as the
R.F. amplifier. C12 is the oscillator tuning-section of the main
tuning capacitor. C42, C43, and C44 are fixed padding capacitors
which allow the oscillator tuned circuit to operate at frequency
slightly higher than that of the R.F. amplifier. Resistors R18, 1119,
and R20 are used to provide a D.C. return to B minus of the oscil?
lator grid circuit.
The oscillator control grid and anode grid of V1 are connected
to the oscillator coils through the crystal socket.
socket consists of two shorting type pin jacks and a
itors C55 and C56 molded into a single unit. When a
inserted, the tuned circuit is disconnected from the
crystal is shunted across the oscillator control and
to from a "Pierce" type oscillator. The pins of the
The crystal
pair of capac?
crystal is
tube and the
anode grids
crystal holder
also make contact with C55 and C56 which serve to raise the input
capacity of the circuit. This increasing of the input capacity is
required to permit accurate correlation of the input which is
SECRPT
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necessary if accurate crystal control is to be achieved. The
output of V2 is transformer coupled to the grid of V3. Ti is a
slug tuned I.F. transformer which has both primary and secondary
tuned to 455 KC.
The secondary of Ti is connected directly to the grid of the
first I.F. amplifier V3. The output of V3 is coupled to the grid
of V4 by a transformer T2, identical to Ti. The operation of V4,
the second I.F. amplifier is identical to and serves the same
function as V3. Gain is controlled in V3 and V4 by means of a
variable negative grid voltage applied through R9 and R12.
The output of V4 is transformer coupled to the diode section
of V5. Rectification of the signal takes place at 455 KC and
audio output voltage is developed across the diode load resistor R16,
C37, C38, and R15 are R.F. filter components in the diode load
circuit.
Audio frequency voltage developed across R16 is coupled
through C39 to the control grid of V5. V5 is a high gain diode-
pentode audio amplifier. The output of the audio amplifier is
coupled to the headphone terminals by means of transformer T4.
The audio characteristic of this receiver is primarily intended
for the reception of C.14 and voice only, and has a limited
frequency response.
Mounted on the I.F. and A.F. subchassis is an additional
subassembly. This is the Beat Frequency Oscillator and Bias
Generator. This stage utilizes V6 in a conventional "Hartley"
oscillator normally tuned by C51 and C52 to a frequency of 455 KC
and variable plus or minus 4 KC. C52 is a specially constructed
Q ri ID V, FT
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variable capacitor having 360? rotation. It short circuits for
180? and is effective through the other 180? of rotation. The
R.F. voltage appearing across L10 is coupled to a diode rectifier
VR1. The output of VR1 is filtered by means of an RC filter, B24
and C47. Approximately 20 volts negative with respect to B minus
is obtained in this manner. This negative voltage is used as
control voltage for R.F. and I.F. gain. Resistors R21 and R22
provide a voltage divider to obtain minus 3 volts for the grid of
the A.F. amplifier V5. This circuit then provides both a B.F.O.
and negative bias voltages for the receiver. To receive amplitude
modulated signals, C52 is rotated to the shorting position. The
frequency of oscillation is now determined by L10 and C5I alone
and is sufficiently removed from the I.F. frequency so that no
beat note is audible. Stray wiring capacitances serve to couple
the output of V6 to V5 for C.V. reception. Coil L11 and capacitor
C53 prevent coupling of the B.F.O. or its harmonics through the
filament circuit wiring into the other stages.
The receiver is turned on and off by means of S9 which is
part of the gain control Pl. The plate supply is not switched.
All R.F. plate circuits are provided with decoupling R-C filters
to provide a high degree of stability.
C-2b. Trouble Sboptir the. IR-2
To properly service this unit the following test equipment
will be required:
1. A dry battery pack. (See section A-6)
2. An accurately calibrated R.F. and I.F. signal
generator.
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3. A calibrated audio output meter.
4. A very high input resistance volt ohmmeter.
(Similiar or equal to R.C.A. volt-ohmyst).
When removing the receiver from the case IT IS ABSOLUTELY
NECESSARY TO FIRST REMOVE THE DESICCATOR CARTRIDGE. Failure to do
this and then attempt to remove the chassis may cause serious
damage to the receiver. Due to the fact that very low voltages
are used throughout the receiver, little or no trouble with
component failure is to be expected.
The use of a dry battery pack rather than one of the power
supplies is recommended for servicing because of the better regu-
lation of the battery filament supply. The first step after
disassembly from the case is to check the vacuum tubes. Sub-
stitution testing is recommended, but an initial continuity check
with an ohmmeter across pins 1 and 7 of each tube will quickly
spot an open filament and will save much time. If all tubes
should be found burned out, the trouble probably lies in the
power supply and not in the receiver. This filament burnout
could be caused by excessive filament voltage from either the RP-1
or RP-2, hence, the reason for using a dry battery pack for checking.
In any ease where more than one filament failure at a time is
observed, never plug receiver back into a power supply without
checking power supply filament voltage. (See G-3) To measure
voltages at the tube sockets from the top of the chassis, a short
piece of wire may be attached to the test probe of the volt ohm--
meter. This wire should be approximately the same diameter as the
pins on the tubes, so that contact may be made in the socket.
vrT,
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Preferably use a dry battery peak when checking voltages at the
tube socket and replace tubes in all sockets except the one under
test. Do not try to adjust R.F. or I.F. tuning without proper test
equipment.
The following is a step by step alignment procedure:
I.F. ALIGNMENT
1. Set signal generator to exactly 455 KC, modulation "on".
2. Couple generator to pin 6 of V2 with 0.1 mfd capacitor.
3. Connect output meter to headphone terminals.
4. Set receiver to 3 MC, short antenna post to ground and turn
off B.F.O.
5. Turn gain control to about two thirds from the maximum position.
6. Adjust output of signal generator to give a reading of approxi?
mately 6 milliwatts at the output meter.
7. Adjust primary and secondary slugs of T3, T2, and Tl to give
maximum output. After each adjustment reduce signal generator
output to keep receiver output level at 6 m1lliwatts or less.
Repeat until adjustments have reduced the output of the signal
generator to the minimum amount that will give 6 milliwatts
output from the receiver.
B.F.O. ALIGNMENT
1. Do not change settings of signal generator from that for the
I.F. alignment but turn off modulation.
2. Replace output meter with a pair of headphones.
3. Turn down gain control until audio level is about that normally
used for reception.
4. Set the B.F.O. knob to the center of the "on" position.
5. Adjust the slug in L10 to obtain zero beat.
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R.F. ALIGNMENT
Range #1
1. Set signal generator, modulation on, to 3 MC and connect to
antenna and ground posts with a 270 ohm carbon resistor in
series to the antenna terminal. Connect output meter to
headphone terminals.
2. Set receiver dial to 3 MC, gain control approximately two
thirds open, B.F.O. turned off.
3. Adjust L7 for maximum output.
4. Set receiver and signal generator to 3.2 MC and adjust Ll and
14 for maximum output.
5. Set receiver and signal generator to 6 MC and adjust C7 for
maximum output. (See Note 1)
6. Set receiver and signal generator to 5.5 MC and adjust Cl and
C4 for maximum output.
7. Repeat 1 through 6, if necessary to obtain proper dial cali-
bration.
BrinPe i2
1. Set signal generator, modulation on, to 6 MC and connect to
antenna and ground posts with a 270 ohm carbon resistor in
series to the antenna terminal. Connect output meter to
headphone terminals.
2. Set receiver dial to 6 MC, gain control approximately two
thirds open, B.F.O. turned off.
3. Adjust L8 for maximum output.
4. Set receiver and signal generator to 6.5 Me and adjust L2
and L5 for maximum output.
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5. Set receiver and signal generator to 6 MC and adjust C8 for
maximum output. (See Note 1)
6. Set receiver and signal generator to 11.5 NC and adjust C2 and
C5 for maximum output.
7. Repeat 1 through 6, if necessary to obtain proper dial cali-
bration.
Jane
1. Set signal generator, modulation on, to 12 MC and connect to
antenna and ground posts with a 270 ohm carbon resistor in series
to the antenna terminal. Connect output meter to headphone
terminals.
2. Set receiver dial to 12 MC, gain control approximately two
thirds open, B.F.O. turned off.
3. Adjust L9 for maximum output.
4. Set receiver and signal generator to 13 MC and adjust 1.3 and
1.6 for maximum output.
5. Set receiver and signal generator to 24 MC and adjust C9 for
maximum output. (See Note 1)
6. Set receiver and signal generator to 22 MC and adjust C3 and
C6 for maximum output.
7. Repeat 1 through 6, if necessary to obtain proper dial cali-
bration..
Note 1: Two peaks may be found for adjustment of C7, CS, and C9.
The correct peak will always be that obtained with the
minimum capacity setting.
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The following are typical tube socket voltage readings to
chassis for the RR-2 Receiver.
Test Conditions: Dry battery plate and filament
supply, gain control on full, R.C.A. volt?ohmyst
test meter, tube removed from socket under test.
V1(1T4) V2(1L6) V3(1T4)
Pin 1 0 volts D.C. Pin 1 0 volts D.C. Pin 1 0 volts D.C.
if 2 490 * w w w 2 490 N N R " 2 490 " 11 N
n 3 490 N NI II R 3 490 n 11 IR w 3 490 " N I?
^ 4 Do not check n 4 0 W N N W 4 Do not check
n 5 0 volts D.C. n 5 490 n R M n 5 o volts D.C.
n 6-0.5 " n n P 6 o w n w n 6-0.5
n 7 41.4 " n R n 7 41.4 n w P If 7 41.4 u 11 R
V4(1T4)
v5(1u5) v6(324)
Pin 1 0 volts D.C. Pin 1 0 volts D.C. Pin 1 0 volts D.C.
" 2 490 a PI R " 2 490 " of n " 2 490 " n n
w 3 490 a W W IS 3 490 n is n n 3 490 n II M
R 4 Do not check w 4 o a II N n 4 Do not check
" 5 0 volts D.C. n 5 Do not check n 5 0 volts D.C.
* 6 ?0.5 II II V "6 ?3 volts D.C. '6 o ' N W
II 7 41.4 il N W W 7 41.4 " w in w 7 41.4 il w n
Voltage on pin 6 of V1, V3, and V4 rises to approximately ?20 volts
D.C. as gain control is rotated to minimum gain position.
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The following is a list of possible troubles with the RR-2 and
the causes thereof:
?-1292081 Probable Cause
1. Receiver dead Defective tube, dead dry
battery, defective power
supply, defective headphones.
2. Low sensitivity Defective tube, poor antenna,
R.F. or I.F. misalignment,
wrong impedance headphones.
3. Calibration in error R F misalignment, dial has
been loosened and is improp-
erly positioned.
4.. No B.F.O. action, no control V6 defective.
of receiver gain.
5. B.F.O. action normal, no control Rectifier VR1 defective.
of receiver gain.
6. No B.F.O. action, normal control C52 stays shorted through
of volume. 360?, L10 out of adjustment.
7. Receiver inoperative on all Contacts in crystal jack
ranges but I.F. noise can be heard assembly not closed. V2
when gain control is advanced. defective.
8. Low sensitivity on one range, Open antenna coil. Check
other two ranges normal. for continuity of antenna
to chassis.
9. Receiver inoperative on one Defective oscillator coils,
range, other two ranges normal. range switch not contacting
properly.
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10. Receiver blocks on strong Defective R.F. or I.F. tubes,
signals and is slow to recover. R1, R9, R12, or R17 open.
11. Battery pack has very short life Switch S9 not opening in off
position, high resistance leak
in bypass capacitors.
12. Receiver noisy Microphonic tubes, defective
battery pack or power supply.
(See vibrator hash under C3).
13. Noticable hum in receiver Open filter capacitors in
when operating from RP-1 or RP-2. power supply. (See C3, C4).
14. Receiver operates normally, RP-1 or RP-2 receiver filament
repeatedly blows tubes after very voltage excessive. (See C3,
short time in use. C4).
15. Receiver self oscillates Loose tube shields, loose
at maximum gain setting of gain screws in chassis covers, poor
control. contact at base of I.F. trans-
formers to chassis, open screen
bypass on V3 or V4.
16. Noticable spurious responses Lll shorted, C53 open, poor
throughout range of receiver contact to shield of B.F.O.
with antenna disconnected, B.F.O. subassembly.
on.
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RECEIVER RR-2, REAR VIEW (CASE REMOVED)
FIGURE 12
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41
RR-2 RECEIVER
1 1IIt
?7:1
1
o
o-
1( . ? ;FL'
c./1 ? )1
_ a_
I 40
44-
?
?A?IT ?????L LI
--' 090000
'Do-ir 8,4
8
HP
NA.Ar--?
e 4
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C-2c. Joist p; Electrical Components for Radio Receiver. RR-2
SYMBOL ITEM QUANTITY
Coils and Traggpmplen
Ll 3 ? 6 MC Antenna Coil 1
L2 6 ? 12 MC Antenna Coil 1
L3 12 ? 24 MC Antenna Coil 1
L4 3 ? 6 MC R.F. Amp. Plate Coil 1
L5 6 ? 12 MC R.F. Amp. Plate Coil 1
16 12 ? 24 MC R.F. Amp. Plate Coil 1
L7 3 ? 6 MC R.F. Oscillator Coil 1
L8 6 ? 12 MC R.F. Oscillator Coil 1
L9 12 ? 24 MC R.F. Oscillator Coil 1
L10 455 KC B.F.O. Coil 1
LU Filament Choke Coil 1
Ti, T2, T3 455 KC I.F. Transformer 3
T4 Audio Output Transformer, Plate to 4000 ohms 1
,Switches
Si, 62, S3 Switch Assembly for Grid of R.F. Amp. 1
S4, S5 Switch Assembly for Plate of R.F. Amp. 1
S6, S7, S8 Switch Assembly for H.F. Oscillator 1
S9 SPST Switch Plate on P1 1
Pesistore
Res. Watt Dia
?
R1, R9, P12 Insultated Resistor 1 M 7.72- 10% 3
R2, P.10, E13 " " 27 K it n 3
R4, R16 ? n 2.2M " " 2
R3, R8 " " 2.2K It n 2
R5, R18, R19,
B20, R23, P25 " " 100 K " " 6
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C-2c. List of Electrical Components for Radio Receiver. RR-2 (Continued)
R6
R7
R11,
R15
R17
SYMBOL
"
"
Eat
Resistors
1/2
"
"
10%
"
"
QUANTITY
Insultated Resistor
R14
"
n
1
1
2
1
1
Egg,leunc
68 1E
22K
E.C.N.
2.2 K
E.C.N.
51 K
1.5M
R21
of
"
E.C.N.
N
5%
1
3M
R22
"
"
E.C.N.
"
"
1
560 K
R24
it
le
3301
N
"
1
R26
"
"
181
"
10%
1
P1
Potentiometer
1 M
1
(linear taper)
Note:
M - Megohm
K - Kilohm
Capacitors
191.1_ y_caLt.
C1,C2,C3,C4 Air Trimmer Cap. 1.5-
C5,C6,C7,C8,C9 21.5 mmf 500 9
C10,C11,C12 3 Gang Tuning Cap. 10 - 500 1
148.4 mmf
C13,C14,C15 Ceramicon Cap. 10 mmf 10% 500 3
C16,C17,C18,
C19?C22,C23,
C26,C27,C28, Paper Cap. .03 mf 400 16
C31,C32,C33,
C36,C46,C47,
C49
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C-2c. List of Electrical Components for Radio Receiver. RR-2 (Continued)
SYMBOL
ITEM
Tol.
Volt
QUANTITY
C20,C21,C37
Capacitors
C38,C51,C54
Ceramicon Cap. 100 mmf
10%
500
6
C24,C25,C29,
C30,C34,C35
Ceramicon Cap. 100 mmf
10%
500
6
C50
Ceramicon Cap. 100 mmf
10%
500
1
C41,C53
Paper Cap. .25 mf
200
2
C39
Ceramic Disc. Cap. .005 mf
500
1
C45
Ceramic Disc. Cap. .01 mf
500
1
C42
Silvered Mica Cap. .0015 mf
1%
500
1
C43
Silvered Mica Cap. .003 mf
1%
500
1
C44
Silvered Mica Cap. .004 mf
1%
500
1
C40
Ceramicon Cap. 750 mmf
10%
500
1
C52
Air Trimmer Cap. 25 mmf
500
1
C48
Ceramicon Cap. 47 mmf
10%
500
1
C55, C56
Ceramicon Cap. 39 mm!
aSS-42-11.1-1-----211eou
10%
500
2
VRI
Bias Rectifier, Type 1N63
1
PL,1
Power Cord & Cable Assembly
1
XTAL
Crystal Socket Assembly
1
SEC P orr
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C-3. LoaerS (See figure 19)
C-3a.
Power Supply, RP-I is a universal power unit designed specif-
cally to provide power for the RT-3 Transmitter and RR-2 Receiver.
The operation of the RP-1 can best be understood if the four modes
of operation are considered separately.
A.C. Mains Operation (See figure 15)
A.C. power is applied through PL2 to pins 1 and 2 on the panel
plug assembly. The A.C. voltmeter is connected across PL2 and reads
applied mains voltage even though switch S2 is in the "off" position.
From the panel plug assembly the A.C. power is applied to trans-
former Ti through a special switching arrangement of S2A, S2B, and
S2C. There are two A.C. primary windings on Ti, PR-1, and PR-2.
These two windings are operated in parallel for voltage steps 75,
90, 110, and 130. For voltage steps 150, 180, 220, and 260, the
two primary windings are in series. (See par. B-4a) The vibrator
primary is unused for A.C. operation.
There are three secondaries on Ti and all three are used for
A.C. operation. The high voltage secondary, sec-1, supplies A.C.
voltage to a combination bridge and full wave selenium rectifier.
The output of the bridge rectifier is fed to a filter consisting
of Ll, C4a, C4b, C5a, and C5b. This combination adequately re-
duces power supply ripple to a negligible amount. R8 and R9 are
used to insure equal voltage distribution across the series con-
nected electrolytic capacitors. The output voltage is 400 volts
D.C. and provides plate voltage for the transmitter.
The output of the same rectifier but functioning as a full
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wave is fed through L3 and R6 to the voltage regulator Vi. Capac-
itors C7a and C7b are connected across the input to R6 and output
from R7. R7 is required to prevent the gas type regulator from
acting as a low frequency relaxation type oscillator. This combin-
ation gives an output voltage of 100 volts D.C. which provides
plate voltage for the receiver.
Secondary 2 is used when on A.C. mains operation to provide
power for the receiver filament circuit. The receiver uses six
1.4 volts D.C., 50 Mk filaments connected in parallel and requires
300 MA total current. The amount of ripple voltage that can be
tolerated is extremely low, hence the large values of filter
components. The A.C. output voltage of Sec-2 is rectified by means
of a full wave selenium stack assembly. The rectified A.C. is
applied to a filter consisting of CS, L2 and 09 through dropping
resistors E3 and R4. R3 and R4 are both in the circuit only for
A.C. mains operation and are connected in series by the action of
S2E. The output voltage is held to 1.3 volts D.C. (aesign center
of tubes) by means of shunt connected selenium stack SS7. This
regulation is achieved by virtue of the non-linear conduction
characteristic of the selenium and by proper adjustment of R3.
6.3 volts A.C. for the transmitter filaments is supplied from
Sec-3. This secondary is only used when on A.C. mains operation
and is controlled through S2D.
Receiver plate and filament power is brought out via Socket
S02. Transmitter power is brought out via Socket 301.
6 Volt ,Datterv Oneratiqn (See figure 16)
6 volts D.C. is applied through the battery cables from J2
SECR''"
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and J3 to pin 3 and ground on the panel plug assembly PL1. The
positive side of the 6 volts D.C. input is fed to the center tap
on primary PR-3 of T-1 through 52D, 52E, 52F, and "hash" choke 14.
Cl and C2 are "hash" filters capacitors. The fixed contacts on
the vibrator are connected across the total primary PR-3. The
center contact or reed of the vibrator is connected to the chassis
which is the negative side of the 6 volt supply. The normal
position of the reed in the vibrator, with battery disconnected,
is in contact with the fixed contacts connected to pins 3 and 4 of
the vibrator. Application of battery power cause the small "motor
coil" to became energized, and shift the reed to the contacts
connected to pins 2 and 5. This causes the current applied to
PR-3 to reverse. The process repeats itself at a high rate of
speed changing the 6 volts D.C. applied to the transformer to 6
volts, A.C. The transformer turns ratio is such that the same
secondary voltage at Sec-1 is obtained as when operated on A.C.
mains. Capacitor C3 tunes the secondary, Sec-1, of Ti to resonance
at the vibrator frequency making the reflected load on the primary
resistive. This prevents excessive sparking and permits proper
operation of the vibrator. Resistors R1 and R2 are damping
resistors which reduce contact sparking further and assist in
elimination of radiated "hash". Chokes Ll and L3 are plate supply
"hash" filters. The rectification and filtering of transmitter
and receiver plate power is identical to that used on A.C. operation.
The operation of the receiver filament circuit differs from
that on A.C. power only slightly. Resistor R3 is no longer in the
circuit and the input to the filter regulator is supplied directly
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from the 6 volts battery rather than from Sec-2 and its associated
rectifier. This function is obtained via S2E in position
#1.
Transmitter filament power is obtained directly from the
battery via S2D in position #1.
The elimination of vibrator "hash" is afforded by proper
shielding of the unit. There are really two unit cases, an inner
and an outer, with the inner case connected at wilysampoint
to the outer case. Capacitors C10, C11, serve to prevent "hash"
from being radiated by the power leads to the transmitter and
receiver.
'hal Generator Operation (See figure 17)
The hand generator used with this equipment already puts out
proper power for the transmitter. The only function of the RP-1
is the distribution of this power and stepping down of the plate
and filament voltages for the receiver.
The output of the hand generator is applied to plug PL3. PL3
has a screw on cover, containing a shorting link between pins 2 and
3, which must be in place for all types of operation except hand
generator.
The plate voltage for the transmitter is applied to the center
tap of Sec-1. The selenium rectifiers offer little resistance to
D.C. and the full output is obtained at 501 plus the fact that
additional filtering is afforded.
The full output of the hand generator is applied to the
receiver plate supply filter and regulator circuit through R5.
Resistor R5 is normally shorted out by the jumper across pins 2 and
3 of PL3.
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rrr, m
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Receiver filament supply is obtained exactly in the same manner
as in battery operation, except that the input of 6 volts comes
from the hand generator via S2D and S2E in position #2. The trans-
mitter filament power is obtained directly from the 6 volts D.C.
generator output via S2D in position #2.
Dlatiy_SW_Ltu (See figure 18)
Battery charging is accomplished by utilizing the rectified
output of Sec-2 of Ti. The high voltage secondary, Sec-1 of Ti
is disconnected and the output of rectifiers SS5 and SS6 is applied
to the battery leads through R10, when SlA, S1B, and S1C are in
the "charge" position. The selection of primary A.C. voltage is
accomplished in the same manner as for A.C. mains operation.
C-3b. Trcuble Shooting the IP-1
The following test equipment will be required:
1. A 20,000 ohm per volt volt-ohm-milammeter.
2. A 0-15 amp. D.C. ammeter.
3. A continuously variable auto-transformer, to allow
precise adjustment of mains voltage.
4. A heavy duty storage battery.
To properly locate trouble in this unit, it is essential that
the preceeding paragraphs on circuit description be understood and
referred to. The output voltages under no load should be measured
first before any disassembly is undertaken. This is done to make
certain that the trouble is with the RP-1 and not one of the other
units. For the greatest accuracy use the auto-transformer to
adjust the mains voltage to the exact value indicated by the voltage
selector knob. When checking on battery operation, insert the D.C.
ammeter in series with the positive battery lead, the positive
ryc.
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SEC"'
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terminal on the battery, the negative terminal on the meter to
the positive lead from the power supply.
The following charts give typical output voltages as
measured at the output sockets under 22.1.24. The voltages under
load ale given in section A-3.
_Qjap_u_tk2p_jjapuL,LtJ_A_3_Q,Osxggal
801 Voltage Reading .?ag. Voltage Reading
to Chassis
Pin 1 0 volts D.C. Pin 1 0 volts D.C.
" 3 .1.510 " H" " 2 o m IV H
u 5 6.3 volts A.C. " 3 4108 ig n gg
" 4 41.7 H II PI
Output of battery leads when on "charge" position and no battery
attached is 8 volts D.C.
L-Y.211.1
M. Voltage Reading 22a Voltage Reading
to Chassis t9 Chis_
Pin 1 0 volts D.C.
^ 3
N 5
4510 "
46
if
Pin 1 0 volts D.C.
II
It
II
2
3
4
4108
41.7
Battery drain, key down, transmitter fully loaded is 12 to 13
amperes.
The following is a list of possible troubles with the RP-1
and the causes thereof.
=OPUS probable Cause
1. No high voltage on Pin 3 of Li open and/or either or both
501. All other voltages proper. C4 and C5 shorted. 552 and/or
SW* defective.
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Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200-0760-0-3---6
2. Abnormally high voltage at V1 defective.
pin 3 of 802.
3. Unit completely dead, A.0 Fuse Y2 blown.
voltmeter does not register
when plugged into mains.
4. A.C. voltmeter indicates Check contacts on S2a, S2b,
but no output voltages A.U. S2c for alignment, Ti
or D.C. present. defective.
.5. High voltage present at L3 open, check resistance of
pin 3 of S01 but no voltage R5, R6, and R7. 04 or Oh
at pin 3 of 802. shorted.
6. No voltage present at pin 4 R3 or R4 open, L2 open, C8
of 802. or C9 shorted. Contacts on
S2E defective.
7. No voltage at pin 5 of S2e or S2d defective.
S01.
8. No high voltage on either SS3 or SS4 defective. Sla
pin 3 of 801 or pin 3 of S02. and Sib not closing, C3
shorted.
9. Excessive drain on 6 volt Vibrator defective, C3 open
battery, all voltages or changed in value.
present but low.
10. Hash audible in receiver Check all chassis connections
when operati'm on 6 volt within case of power supply,
battery. check Cl, C2, C3, R1, R2, C11,
and C10.
spr-prT
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SECPL'm
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U. Battery charging rate low or Check R10. S35 and SS6 may
zero, be defective and will show
up as low receiver filament
voltage.
12. Excessive voltage at pin SS7 defective, R3 or E4 out
4 of S05. of adjustment.
13. Low voltage at pin 3 of SO2 Shorting jumper across pins
2 and 3 of P6 not making
contact.
If it should ever be necessary to replace SS7, the following
adjustments must be made before plugging the receiver into the
power supply. After replacing SS7, shunt a 4.5 ohm one watt
resistor across pins 1 and 4 of SO2 and operate the power supply
from a 6 volt fully charged battery. Read D.C. voltage across the
4.5 ohm resistor and adjust R4 until the voltage is 1.3 volts D.C.
Now operate unit on A.C. mains voltage. Set the voltage selector
knob to 110 volts and by means of the auto-transformer adjust the
mains voltage to exactly 110 volts. Adjust R3 to give same voltage
as on battery operation. Do not change adjustment of R4 when
operating from mains power.
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Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070003-9
FIGURE 14 POWER SUPPLY RP-1, REAR VIEW (CASE REMOVED)
SE CRE'l
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sEcirz)ec)assified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070003-9
LJ
2
c.3-
d
ow 3
0 cc CL
Cl)
I (
In
JSUISOISUSLUi
'717
0 in 0 0
N a)
a.
V
,11"?0 00 00 0
ma) ?rfl
? ? ? N ?
a.
A.C.PRIMARY
SHOWN AS
CONNECTED
SIMPLIFIED SCHEMATIC OF RP-I
SECRET
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Declassified and Approved For Release 2013/07/08 : CIA-RDP78-03561A000200070003-9 CRET
SIMPLIFIED SCHEMATIC OF RP-I
SECRET
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SEC Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070003-9
SECPRT
Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070003-9
Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A0002000709,03-9.ET
I? 0
_J
0
A.G. PRIMARY
A.G. OPERATION
FIGURE I8
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S24
30
2
I I
S26
9
IL 110
a
0
111.,-WH. 130 a
WM.
PR-2
BR-WH 7?
150 of
GR. 904
415 e ,
Sgc
I T A
R0,-WH. I I 0 .;.a,
220
emen4.1;9
260
BLK
5 6
40 0 0 9
OS
20 0
00
I ? 10
s2a
SWITCH POSITIONS
I-BATTERY
2-OFF6 HAND GEN
3-260
4-220
5-160
11-1 5 0
7-130 R,
1-110
9- 90 47
0-15 1W.
.5
ov.
PR-3
SL
L
4
.5
S2 )1 120V.
M1990000004
i RD diP siA 1
++ ++
01 ----04-04-0-04--4-?--1
SS, SS,
MK RFC
1 SEC-1
.01
a WA 1500 V. + + + + 56K
C SS 3 $S 4 2W.
Lee sill
_02
YU
01
11,7,
Ce
R9
56K
2W. 40 40
3 50 V. 35O V.
C48
40
350V 350V.
C54
S5 B
.05
400V.
L5
1 MM.
OR.AD.
SS5
+14
C-2 H-BL
2
5,5
YE
4SS5
R5 6 7 +100V CI3
.01
5K IOW. 420 I/2W 404_11
10K IOW. -et 0
713 0.-11 ?'i?40 V, 40 / I
3 350V. Is 7012
50V.
062 1
400V.
4
0
25 - 10W.
.4/ACIJ.Hik
WH
SI..
SEC-3
6.3A C.
0
BLIGYE
?
+1.3V.
L..
.5HY. 5.11.
ce c21-- + ss,
15001 1500
6V 6V.
5! le
Aolcieo
VIBRATOR
47
1W.
2E
011
400v
4
4
*--)1 ?
CIO
.1.400V
WM.-BR
vnt-e-on.
5 6
dt, 0 0 07
30 .90 OS
20' 09
00
I 10
CHASSIS ASSEMBLY
2
S20
WH.
0
0
0
0
2
3
4
5
C)-6j2V
+6V. V-5-04.TS
C141
.01
5001
ONO. STRAP
TO CHASSIS
1; PI-1
C
L.
6
9
10
15A
A.C.
2A
A.0
3
SO2
4
TRANS.
PWR.
ISEE NOTE I.
GNI). STRAP ?
TO CHASSIS -
PANEL. ASSEMBLY
GEN.
INPUT
NOTE
OENOTES JUMPER SWITCH IN GENERATOR
INPUT COVER.
2.S1,4,9x CHARGE-OPERATE SWITCH.
3.S4 VOLTAGE SELECTOR SWITCH.
4.A LL CAPACITANCES IN MICRO-FARADS.
FIGURE 19
SCHEMATIC OF
POWER SUPPLY RP-1
Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070003-9 ET
C-3c. 'hist of Electrical Components for Paver SUPD1Y. RP-1
SYMBOL ITEM QUANTITY
Resistors
R-1, R-2 Res. - 47 Ohm 1 W 2
R-3, R.4 Res. - 25 Ohm 10 W - Adj. Vitreous 2
R-5 Res. - 10 K Ohm 10 W - Vitreous Fixed 1
R-6 Res. - 5 K Ohm 10 W - Vitreous Fixed 1
Rm-10 Res. - 0.3 Ohm 10 W - Vitreous Fixed 1
R-7 Res. - 470 Ohm 1/2 W 1
R,8, 11,9 Res. - 56 K Ohm 2 W 2
aLIELVAULLE
C-3 Capacitor - .01 mf 1500 V. 1
C-1, C-2 n - .5 mf 100 V. Hash 2
C-8, 0-9 ? ? 1500 mf 6 W.V. 2
C-4A,B;C-5A,B;
C-7A,B " - 40 x 40 mf 350 W.V. 3
0-6 V ?? .05 Mf 400 V. Tubular 1
0-10 " - .1 mf - 00 V. Tubular 1
C-111C-122C-13 " - .01 mf - 400 V. Tubular 3
C-14 " - .01 mf - 500 V. Mica 1
pectifiers
SS-1,S-2,SS-3,
SS-4 Selenium Rectifier Stack - 200 Mit, H.V. 4
SS-7 n " " - Regulator 1
55-5, SS-6 " " " - 5 amp., L.V. 2
NA-9.9-1.1V-Wak
14r-1 Voltmeter 0-300 volt A.C. 1
PL1 Male Connector Strip Plug, 10 contact 1
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SEC R ?Declassified and Approved For Release 2013/07/08 : CIA-RDP78-03561A000200070003-9
C-3c. (Continued)
.sxma4 ITEMuAg_xTry
Miscellaneous
PL2 Molded Line Cord and Plug 1
PL3 Molded 5 Contact Panel Plug 1
Jl Female Connector Strip Jack, 10 Contact 1
J2, J3 Female Battery Terminal Jack 2
SO1 Molded 5 Contact Socket 1
SO2 Molded 4 Contact Socket 1
15 Amp. Fuse, Type 3 AG 1
7-2 2 Amp. Fuse, Type 3 AG 1
s-1its-1BA-24 3 Pole, 2 Position Switch 1
S-2A, S-1B, S-1C
S-1D S-IE, S-1F,
S-1G 7 Pole) U. Position Switch
1
T-1 Power Transformer 1
L-4 Choke - Hash - 15 Amp. 1
If-1 Choke - R.F. - 1 MH. - 100 MA 1
1r-2 Choke - Filter - 5 II!. - 5 Ohms 1
L-3 Choke - R.F. - 1 MH. - 50 MA 1
VB1 Synchronous Full Wave Vibrator, 6 Volt 1
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Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070003-9
C-4. Power Suppli
C-4a. Circuit (See figure 20)
Power Supply, RP-2 is an A.C. operated power supply designed
specifically to provide power for the RT-3 transmitter and the i1ir-2
receiver. The electrical circuit functioning of the RP-2 is very
similiar to the RP-1 when the latter is operated from A.C. mains.
The construction of this unit is somewhat aifierent, however, since
it is intended for operation from A.C. mains only.
A.C. power is applied through plug PL3 to 2 and 3 on the ter-
minal strip. The A.C. voltmeter is connected across PL3 and reads
the applied mains voltage even though switch Si is in the "off"
position. From the terminal strip TS-1, the A.C. power is applied
to transformer Ti through a special switching arrangement of SIA,
S1B, and S1C. There are two primary windings on T1, PR-1, and 1112.
These two windings are operated in parallel for voltage steps 75,
90, 110, and 130. For voltage steps 150, 180, 220, and 260, the two
primary windings are in series.
There are three secondaries on Ti. The high voltage secondary
Sec-1 supplies A.C. voltage to a combination bridge and full wave
selenium rectifier. The output of the bridge rectifier is fed to
a filter consisting of a single capacitor C5 connected across the
high voltage output terminals 1 and 3 of socket SO-1. The output
voltage is 400 volts D.C. and provides plate voltage for the trans-
mitter.
The output of the same rectifier, but functioning as a full
wave, is fed through 1t2 to the voltage regulator VI. Capacitors Cl
and C2 are connected across the input to E2 and output from R3.
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SECR Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070003-9
R3 is required to prevent the gas type regulator from acting as a
low frequency relaxation oscillator. The output from the full wave
circuit is 100 volts D.C. which provides plate voltage for the
receiver. This voltage appears across pins 1 and 3 of 802.
The output of secondary, Sec-3, is rectified by means of a
full wave selenium stack assembly. The rectified output is applied
to a filter consisting of C3, Ll, and Cl.. through a dropping resistor
R1. The output voltage is held to 1.3 volts D.C. (design center of
tubes) by means of a shunt connected selenium stack 885. The
voltage is brought out through pins 1 and 4 of SO2 and supplies
filament voltage for the receiver.
6.3 volts A.C. for the transmitter iilaments is supplied to
pins 1 and 5 of SO-1 directly from Sec-2 of T-1.
C-4b. Troubje Shqotink the RP-2
The following test equipment will be required:
1. A 20,000 ohm per volt volt-ohm-miliammeter.
2. A continuously variable auto-transformer, to allow
precise adjustment of line voltage.
As with the RP-2, first measure the no load output voltages
to make certain that the trouble is in the power supply and not in
one of the other units. For greatest accuracy use the auto-trans-
former to adjust the mains voltage to the exact value indicated by
the voltage selector knob.
The following chart gives typical voltages as measured at the
output sockets under no load. The voltages .?_sz_:_ja_ad are given in
section A-4.
SECRF'"
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Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070003-9
Qkt..agggjjaw.,I,,,QWQxltt 1 V ales
Voltage Reading 22a Voltage Reading
Chqi
tq?c114.11AS ,
Pin 1 0 volts D.C. Pin 1 0 volts D.C.
" 3 4545 " " 2 0 II NW
N 5 6.3 volts A.C. n 3 +108 " II
H 4 f1.7 " II NI
The following is a list of possible troubles with the RP-2
and the causes thereof.
probable Causes
1. No high voltage on Pin 3 C5 shorted and SS2 and 854 open.
of SO-1, all other voltages
proper.
2. Abnormally high voltage V1 defective.
at pin 3 of 50-2.
3. Unit completely dead, A.0 Fuse Fl blown.
voltmeter does not register
when plugged into mains.
4. A.C. voltmeter indicates Check contacts on 81A, B, and C,
but no output voltages Ti defective.
A.G. or D.C. present.
5. High voltage present at R2 open, h3 open, Cl or C2
pin 3 of SO-1 but no shorted.
voltage present at pin 3
of 302.
6. No voltage present at pin 4 of R1 open, Ll open, C3 or C4
502. shorted.
7. Excessive voltage at pin 4 SS5 defective.
of 502.
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SECF Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070003-9
If it should ever be necessary to replace SS5, the following
adjustment must be made before plugging the receiver into the
power supply. After replacing 8S5, remove the screws holding the
metal box on the panel. Underneath this box are two resistors.
The adjustable resistor is R1 which controls the filament voltage
for the receiver. Plug unit into mains and set for 110 volts
operation. By means of the auto-transformer, adjust mains voltage
to exactly 110 volts. Shunt pins 1 and 4 of SO2 with a 4.5 ohm,
1 watt resistor and measure the D.C. voltage across the resistor.
Adjust until this voltage is 1.3 volts D.C. heplace metal box
and tighten all screws evenly.
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dv pue pe!pssepea
80/L0/ ?1,0z aseele
SIA
75
90
110
130
0
04 5 60-
03 70
02 80
19rV
SIB
90c.
I 8 0 ?:?
1102
220
130
70
1--02 80
90
SWITCH POSITIONS
1- OFF
2-260
3-220
4-leo
5-150
6-130
7-110
8- 90
9- 75
260
I z-,;
loI
RED-Y
..43 LK 4 WH -IR
RED -Y
TS-1
08
07
WH 4 GR -19
WH - 8LK
06
05
04
+
S52
2 2
2 OCMIFOIE:4,4)44.:_tgjS3
350W V SS4 7
GR
.4-03
BLK -VIH
? 02
6.3V AC
140
? SS
pc=, 6
+ 7V DC
SS?
+140
?
FI
2AMP
FUSE
BLK -) 01
POWER
GABLE
WH R
SE L REG.
?
0132
R3
20 Mb
350WTC2
STACK
SSS
5 I
WH -BM
WR PL2I
RCVR
ALP
3.
63V A C
+ 108 V
+400V
GNU LUG
BELOW TS-2
GND LUG
AP' 541
L.F T I
PANFL ASSLP.8,..Y
CHASSIS
ASSEMBLY
16 MVO
T70C vv V
C5
FIGURE 20
SCHEMATIC OF POWER SUPPLY RP-2
0
(D
0
(f)
(f)
=P;
(D
)
E
(D
-
(D
(T)
(f)
(D
n.)
' o
o.)
co
. .
0
0
-0
0
0.)
cy,
0
0
0
n.)
SECP"
Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070003-9
C-40. List of Electrical Components for Power Supply. RP-2
SYMBOL
ITEM
QUANTITX
B-1
R-3
Pesistprs
1
1
1
Resistor - 25 Ohm 10 Watt Adj. Vitreous
Resistor - 5 K Ohm 10 Watt Adj. Vitreous
Resistor - 470 Ohm 1/2 Watt Carbon
CaPacitors
C-1, C-2
Capacitor - 20 x 20 mf 350 Volt Working
1
C-3, C-4
Capacitor - 1500 mf 6 Volt Working
2
C-5
Capacitor - 16 mf 700 Volt Working
1
Miscellaneous
SS-1, 2, 3,
4
Selenium Rectifier Stack - 200 MA, H.V.
4
SS-5
Selenium Rectifier Stack - Regulator
1
SS-6, SS-7
Selenium Rectifier Stack - 1 Amp., L.V.
2
F-1
2 Amp. Fuse-Type 3 AG
1
T-1
Power Transformer
1
Choke - Filter - 5 HI. - 5 Ohms
1
SO-1
Molded 5 Contact Socket
1
S0-2
Molded 4 Contact Socket
1.
PL-3
Molded Line Cord and Plug
1
S1A,S1B,S1C
Switch - 3 Pole, 9 position
1
M-1
Voltmeter 0-300 Volts A.C.
1
TS].
Terminal Board (TS1) Assembled
1
T52
Terminal Board (TS2) Assembled
1
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Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070003-9
OFFcvLU..!;
tes.t
omcburoNLY
Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070003-9