INSTRUCTION BOOK FOR TRANSMITTER, MODEL RT-1-B

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03561A000200070001-1
• Release Decision: RIFPUB
• Original Classification: R
• Document Page Count: 42
• Document Creation Date: December 23, 2016
• Document Release Date: July 8, 2013
• Sequence Number: 1
• Content Type: MISC

Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1
r esr RESTRICTED
INSTRUCTION BOOK
FOR
TRANSMITTER, MODEL RT-1-B
RESTRICTED
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Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1
RESTRICTED
INSTRUCTION BOOK
FOR
TRANSMITTER, MODEL RT-1-B
Wa4ifia9!
HIGH VOLTAGE IS USED IN THE
OPERATION OF THIS EQUIPMENT.
DEATH ON CONTACT MAY RESULT
IF OPERATING PERSONNEL FAIL
TO OBSERVE SAFETY PRECAU-
TIONS.
RESTRICTED
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CONTENTS
A.
GENERAL DESCRIPTION
SPECIFICATIONS
PAGE
5
1.
TRANSMIT TER
6
Z.
POWER SUPPLY
6
3.
ACCESSORY UNIT
7
B.
OPERATING INSTRUCTIONS
1.
OPERATING CONDITIONS
8
2.
INSTALLATION
8
3.
CRYSTALS
8
4.
ANTENNAS
8
5.
TUNING
9
6.
KEYING
9
7.
V.F.O. OPERATION
10
8.
RADIOTELETYPE OPERATION
10
C.
MAINTENANCE
1.
CIRCUIT DESCRIPTION
12
2.
TROUBLE SHOOTING
16
3.
PARTS LIST
18
4.
DIAGRAMS, CHARTS, AND PHOTOGRAPHS
21 -39
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INDEX OF ILLUSTRATIONS
FIGURE
TITLE
PAGE
CHART
1
TYPICAL RESISTANCE MEASUREMENTS
21
CHART
2
TYPICAL OPERATING VOLTAGES AND CURRENTS
22
1
RADIO TRANSMITTER RT-1-B, COMPLETE STATION
4
2
ACCESSORY UNIT OPERATING INSTRUCTIONS
23
3
RT-1-B TUNING INSTRUCTIONS
24
4
RADIO TRANSMITTER RT-1-B, FRONT VIEW
25
5
RADIO TRANSMITTER RT-1-B, REAR VIEW
26
6
RADIO TRANSMITTER RT-1-B, TOP VIEW
27
7
RADIO TRANSMITTER RT-1-B, RIGHT SIDE VIEW
28
8
RADIO TRANSMITTER RT-1-B, LEFT SIDE VIEW
29
9
RADIO TRANSMITTER RT-1-B, BOTTOM VIEW
30
10
RADIO TRANSMITTER RT-1-B, SCHEMATIC DIAGRAM
31
11
POWER SUPPLY FOR RADIO TRANSMITTER RT-1-B,
FRONT VIEW
32
12
POWER SUPPLY FOR RADIO TRANSMITTER RT-1-B,
TOP VIEW
33
13
POWER SUPPLY FOR RADIO TRANSMITTER RT-1-B,
BOTTOM VIEW
34
14
POWER SUPPLY FOR RADIO TRANSMITTER RT-1-B,
SCHEMATIC DIAGRAM
35
15
ACCESSORY UNIT FOR RADIO TRANSMITTER RT-1-B,
FRONT VIEW
36
16
ACCESSORY UNIT FOR RADIO TRANSMITTER RT-1-B,
REAR VIEW
37
17
ACCESSORY UNIT FOR RADIO TRANSMITTER RT-1-B,
VIEW OF VARIAC
38
18
ACCESSORY UNIT FOR RADIO TRANSMITTER RT-1-B,
SCHEMATIC DIAGRAM
39
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RADIO TRANSMITTER RT -1 - B
FIGURE 1 COMPLETE STATION
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GENERAL DESCRIPTION.
(a)
(b)
5
The Model RT-1-B equipment described in this instruction book is
a C.W. transmitter, in three units, rated at 100 watts output, and covering
the frequency range of 3 to 30 megacycles in 5 bands. The three units are:
(1) Transmitter.
(2) Power Supply.
(3) Accessory Unit (For line voltage control and housing spare parts and
accessories).
All controls except the main "ON-OFF" switch and those used to ad-
just the equipment to match the available line voltage are located on the
front panel of the transmitter unit.
All units are interconnected by self-contained attached cables.
The transmitter can be adjusted to match any single wire unbalanced
antenna of from 50 to 1500 ohms impedance or a balanced antenna of 72
ohms impedance.
The overall weight of the equipment ready for use is approximately
130 pounds. (In carrying cases, approximately 190 pounds).
Carrying cases are provided for each unit.
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TRANSMITTER RT-1--B
A. SPECIFICATIONS
A-1. Transmitter
Power Input: 1350 volts D.C. at 200 ma.
500 volts D.C. at 100 ma.
115 volts A.G., 50 to 400 cycles
Frequency Range: 3 to 30 megacycles, in 5 bands
Frequency Control: Crystal or Variable Oscillator
(external unit)
Available Inputs: (a) Jack for telegraph type key
(Identified as "Key")
(b) Connector for Variable Frequency Oscillator
and Radioteletype.
(Identified as "V.F.O. Input")
Available Outputs: Terminals from keying relay to key a Variable Fre-
quency Oscillator simultaneously with the transmitter
oscillator and intermediate amplifier stages.
Jacks for single wire, unbalanced, antennas.
Jacks for balanced 72 ohms antenna.
Power Output: 100 watts, 3 to 21 megacycles.
75 watts, 21 to 30 megacycles.
Tube Complement:
1
- JAN 6AC7
Oscillator -Multiplier
1
- 2 E26
Intermediate Amplifier
1
-4-65A
Power Amplifier
1
- JAN 6Y6G
Screen Voltage Regulator
1
- JAN VR-150
Voltage Regulator
Physical Dimensions: 14" x 10" x 9" (exclusive of carrying-handle)
Weight: 30 1/2 pounds
50 1/2 pounds in carrying case
A-2. Power Supply.
Power Input: 115 volts, A.C., 50 to 400 cycles;
430 watts at 60 cycles with a power factor of 95%
425 watts at 400 cycles with a power factor of 97%
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Power
Output: 1350 volts D.C. at 200 ma.
500 volts D.C. at 100 ma.
115 volts A.C., 50 to 400 cycles
115 volts A.C., 50 to 400 cycles at
200 watts (service outlet)
}Through
Power cable
Tube Complement:
1 - JAN 5R4GY Low voltage rectifier
2 - JAN 816
High voltage rectifiers
Physical Dimensions: 14" x 10" x 9" (exclusive of carrying handle)
Weight:
60 1/2 pounds
80 1/2 pounds in carrying case
A-3. Accessory Unit.
Power Input:
Two ranges:
90 to 140 volts A.C., 50 to 400 cycles
or, 180 to 280 volts,A.C., 50 to 400 cycles
Power Output: 115 volts A.C., 50 to 400 cycles, at 500 watts. ("Trans-
mitter Only" outlet)
and, 115 volts A.C., 50 to 400 cycles, at 300 watts. (Duplex
"Service" outlet)
Physical Dimensions:
Weight:
14" x10" x 9" (exclusive of carrying handle)
39 pounds
59 pounds in carrying case
DiTect Equipment Spare Parts:
1 JAN 6AC7 Tube
1 2E26 Tube
1 4-65A Tube
1 JAN VR-150 Tube
1 JAN 6Y6G Tube
1 JAN 5R4GY Tube
2 JAN 816 Tube
1 Keying Relay
4 Banana plugs
(double, insulated)
4 Pilot bulbs, 6V
4 Pilot bulbs, 115V
10 Fuses, 5 amperes
10 Fuses, 2 amperes
10 Fuses, 10 amperes
10 Fuses, 3 amperes
1 Knob, 1" with pointer
1 Knob, 11/2"
1 Knob, Band Switch
1 Connector, Coax.
1 Adapter, Coax.
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B. OPERATING INSTRUCTIONS.
B-1. Operating Conditions:
Ambient temperature range: -5?C to +55?C. (-40?C for storage)
Ambient humidity range; up to 90%
Duty:
The ratings are for continuous duty. In the case of On-Off Keying,
a 50% duty cycle is assumed. In the case of frequency shift (Radiotele-
type, Paragraph B-8) additional ventilation is recommended.
Line voltage and frequency ranges: 90 to140 and180 to 280 volts A.C.
at 50 to 400 cycles per second.
B-2. Installation (see figure 1)
Placement of units:
The transmitter is designed for operation on the operator's desk or
table. (For remote keying see paragraph B-6 "Keying"). Interconnecting
leads between the three units are six feet long, permitting placement of
the Power Supply and Accessory Unit either on or under the table, the
Accessory Unit to be within six feet of a power outlet.
All units must have good ventilation to prevent overheating. Caution
must be exercised to insure that none of the ventilation screens in the units
are obstructed.
The transmitter must be located as close as possible to the antenna
lead-in to the room, and to an adequate "ground". (See paragraph B-4,
"Antennas").
When connecting the three units together and connecting the Accessory
Unit to the power line, it is very important to comply with the instructions
located inside the front cover of the Accessory Unit. (figure 2)
B-3. Crystals
Any crystal which is equal in frequency to the output frequency or
which is equal to exactly 1/2,1/3 or 1/4 of the desired output frequency
may be used. Cleaner keying is generally obtained when using crystals
cut to a sub-multiple of the desired output frequency than with those cut
to the fundamental frequency. Do not attempt to use crystals which are
intended for "over tone" operation. Generally "overtone" crystals bear
name plate frequencies above 10 megacycles.
B-4. Antennas.
For single frequency operation a half-wave doublet antenna with a
transmission line of 72 ohms impedance, twin-lead or twisted pair, is re-
commended. This lead-in would be connected to the transmitter antenna
jacks marked "Link".
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For coverage of several random frequencies a single wire of any
length greater than 5/8 of a wavelength at the lowest operating frequency
may be used; however, an electrical length of an integal number of exact
half-wave lengths may render proper loading impossible. If loading trouble
is encountered at some particular frequency, add to the antenna length
approximately 1/8 to 1/4 wavelength of wire at that frequency. If such
treatment results in loading trouble at another frequency, a second an-
tenna will be required.
A good ground connection, with the lead to the ground as short as
possible, is required to complete the antenna installation.
A "good ground" may consist of a metal spike or post driven ap-
proximately 6 feet into moist earth or of a connection to existing buried
pipes, such as water supply pipes. Where the conditions are not suitable
for this type of ground, such as in a desert area or on very rocky soil,
a counterpoise may be used. The counterpoise should consist of at least
one but preferably several equal length wires 1/4 wave length or longer
at the lowest used frequencies, installed close to and insulated from the
ground, directly under the antenna, and spread out fanlike in several di-
rections, each at equal height from the ground.
Note: Double banana-type plugs are supplied with the Transmitter
spare parts for antenna and ground connections.
B-5 Tuning.
The operator should be thoroughly familar with the "Tuning instruct-
ions" and chart located on the inside surface of the front cover of the
Transmitter, before attempting to operate the Transmitter. (See figures
3 and 4).
After completing the tuning as outlined by these instructions, a more
efficient adjustment of the excitation control sometimes can be obtained
by retuning the excitation control slightly to obtain a slight increase in
power amplifier plate current. This is possible when the power ampli-
fier grid current exceeds 12-15 milliamperes. The reduction in grid drive
to the optimum value actually results in higher power amplifier output
and improved efficiency.
B-6 KeLiLsi .
A keying relay is incorporated in the transmitter to provide for more
positive keying and also to allow for remote position keying. The mimi-
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mum necessary keying line current is 5.5 milliamperes. An extra set of
contacts provided in the relay may be used to key an external Variable
Frequency Oscillator simultaneously with the Transmitter. Connections
to these contacts are terininals available on the left side of the chassis,
identified as "KEY-GND-MUTE". The "Key" contacts are normally open
and the "Mute" contacts are normally closed. (See figure 8). A jack is
provided on the front panel identified as "Key" for insertion of the key plug.
Break-in operation is possible since the crystal oscillator is keyed.
The "Mute" contacts may be used to reduce the sensitivity of the receiver
during transmitting as follows: A resistance high enough in value to re-
duce the sensitivity of the receiver to a low level for monitoring the trans-
mitter signals is installed in series between the receiver sensitivity con-
trol and chassis ground. The "Mute" and "Gnd" terminals are wired to
connect across this resistor. The "Gnd" lead must be connected to the
receiver chassis ground. Under "keyup" ("receive") conditions, the "Mute"
contacts are closed, thus shorting out the resistor and returning the re-
ceiver sensitivity to normal.
It is recommended that the transmitter and receiver antennas be sep-
arated as much as possible to reduce the possibility of damaging the re-
ceiver by the high power output of the transmitter.
B-7. Variable Frequency Oscillator Operation.
To operate using an external Variable Frequency Oscillator for fre-
quency control, setup the Transmitter and Variable Frequency Oscillator
as follows:
1. Connect the output of the Variable Frequency Oscillator through a
coaxial cable to the "V.F.O. Input" receptacle on the right side of the
Transmitter. (See figure 7).
2. If it is desired to key the Variable Frequency Oscillator simultaneously
with the Transmitter, connect the keying leads or terminals of the Vari-
able Frequency Oscillator to the "Key" and "Gnd" terminals located on
the left side of the Transmitter.
3. Connect the key to the Transmitter front panel "Key" jack and set the
"Xtal-V.F.0." switch to the "V.F.0." position.
4. Tune the Variable Frequency Oscillator to a sub-multiple (1/2 or 1/3)
of the desired Transmitter output frequency. Do not attempt to operate
the Transmitter on the fundamentalfrequency of the Variable Frequency
Oscillator. Approximately .1 watt of signal power is required.
5. With the key "closed", tune up the Transmitter as described in the
"Transmitter Tuning Instructions".
B-8. Radioteletype Operation.
For Radioteletype operation, set up the Transmitter and Radiotele-
type Exciter (frequency shift oscillator or other type) as follows:
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1. Connect the output of the Radioteletype Exciter through a coxial cable
to the "V.F.O. Input" receptacle located on the right side of the Trans-
mitter chassis.
2. Set the "Xtal-V.F.0." switch to the "V.F.0." position. The key jack
must be in the closed position (no plug inserted in the jack).
3. Tune the Radioteletype Exciter to a sub-multiple (1/2 or 1/3) of the
de sired Transmitter output frequency. Do not attempt to oper ate the Trans -
mitter on the fundamental frequency of the Exciter. Approximately .1 watt
of signal power is required.
4. With the Exciter emitting a constant signal, tune up the Transmitter
as described in the "Transmitter Tuning Instructions".
5. Additional ventilation should be provided by locating equipment in the
path of free flowing air, i.e. a natural draft or the air from a fan.
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C. MAINTENANCE.
C-1. Circuit Description.
C-la. General
The Model RT-1-B Transmitter and accessories have been de-
signed to operate from a very wide range of alternating currentpower
line voltages and frequencies, covering practically every common
alternating current power line condition found anywhere in the world.
The wide range of carrier output frequencies is easily and quickly
covered through a system of ganged tuning and band switching. All
tuned circuits operate at the same frequency, that is, the output fre-
quency. All frequency multiplying is accomplished in the oscillator
stage. The antenna matching network has been designed to match a
wide range of antenna impedances.
C-lb. Oscillator.
The crystal oscillator -frequency multiplier stage is of the Pierce
circuit type, wherein the screen grid of the 6AC7 tube acts as the anode
of the triode crystal oscillator section and the plate is coupled to the
oscillator section by only the electron stream. The crystal is con-
nected electrically between the control grid and the screen grid.
The tuned circuits are in the plate circuit and are resonated to
select either the fundamental crystalfrequency or a harmonic of that
frequency (2nd, 3rd, or 4th). The variable capacitor and the induct-
ances of this plate circuit are ganged tuned and switched with the
capacitor and inductances of the intermediate amplifier stage, and the
inductances of the power amplifier stage.
When an external Variable Frequency Oscillator is used for fre -
quency control, the 6AC7 oscillator stage is used as a class C multiplyer
stage. Since the tuned circuits of all three stages are always tuned
to the same frequency it is necessary to use the external Variable
Frequency Oscillator tuned to a sub-multiple of the desired output
frequency to avoid the possibility of self-excited oscillation.
Capacitor C2, which couples the screen grid of the 6AC7 to the
crystal when the 6AC7 is used as a crystal oscillator, is connected
to chassis ground when the "Xtal-V.F.0." switch is set to "V.F.0.",
thereby effectively grounding the screen grid to R.F. voltages and
enabling the stage to be used as a class C multiplier.
C-1c. Power Amplifier.
A single type 4-65A tetrode is used as a power amplifier, opera-
ting in class C. This stage is capacity coupled to the preceding in-
termediate amplifier stage. The associated tuned circuits are located
in the plate circuit and are coupled to the antenna through link coupling
or through a pi network. Grid bias is obtained through a combination
of grid leak resistance and fixed bias.
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Double protection against damage due to loss of excitation is
provided for this stage; first, the fixed grid bias, and second, screen
voltage regulation, accomplished through the use of a type 6Y6G tube
whose plate is connected directly to the 4-65A screen grid. The action
is described as follows:
When the Transmitter is not keyed (excitation off), the power
amplifier tube is biased by the fixed bias supply of approximately -60
volts. The keying relay contacts which connect the excitation to the
6Y6G grid are open, and the voltage at this grid is zero, causing the
tube to draw sufficient plate current through the 4-65A screen volt-
age dropping resistors to drop the screen voltage to approximately
50 volts. This limits the plate power dissipation of the 4-65A tube
to less than its rated maximum of 65 watts. When the keying circuit
is closed and excitation if applied to the 4-65A grid, the fixed bias
source is grounded at the relay by the key, and the 6Y6G grid is con-
nected to the 4-65A grid circuit through the relay contacts. The grid
bias voltage developed by the excitation across the 4-65A grid leak
resistor, R21, is applied through the relay contacts to the 6Y6G grid,
biasing this tube beyond plate current cutoff. This restores the 4-65A
screen grid voltage to normal and allows the power amplifier to op-
erate in a normal class C manner.
If the excitation were to fail when the relay circuit is closed,
thus shorting out the fixed bias source, the voltage at the 4-65A and
6Y6G control grids would be zero and the 6Y6G screen voltage re-
gulation feature would operate and protect the power amplifier tube
against excessive plate current.
The "Tune-Operate" switch shorts the control grid of the 6Y6G
tube to ground in the "Tune" position. In this condition the grid bias
voltage of the 4-65A tube that is developed by excitation is not ap-
plied to the 6Y6G grid, and, also, is reduced in value because the grid
leak resistor of the 4-65A tube, R21, is also shorted, leaving only the
bias voltage developed across the grid radio frequency choke, RFC-5.
Since the 6Y6G grid voltage is zero, the tube passes a large plate cur-
rent, thus reducing the 4-65A screen grid voltage. The power ampli-
fier stage then operates at low plate current dissipation and low power
output making conditions safe for the Transmitter tuning procedure.
C Antenna Matching.
A dual range pi network is incorporated in the Transmitter and
is used to match into unbalanced antenna loads of from 50 to 1500 ohms
impedance. The two ranges are referred to as "High Z" and "Low
Z" on the Transmitter frontpanel loading control. There is no sharp
point of demarkation between high and low antenna impedance ranges
on this loading control because the output frequency also affects the
control setting.
Switching between high and low antenna load ranges is accom-
plished by a cam on the loading capacitor which operates a switch to
include or exclude an additional capacitor into the pi-network cir-
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cuit. This capacitor is added into the circuit for "Lo Z" range and
is omitted for the "Hi Z" range.
There is also available a low impedance balanced output circuit
termed the "Link" output to match a balanced antenna load of 72 ohms
impedance. If a balanced output circuit of up to 300 ohms impedance
is required, it will be necessary to shunt the "Link" output with a
small variable capacitor, (not supplied) having a maximum capacity
of 150 micro-microfarads. For balanced antenna loads exceeding 300
ohms, an external antenna coupler will be required. The antenna
loading control should be in the "Tune" position at all times when
operating into a balanced load.
C -le . Keying Relay and Bias Circuit.
The Transmitter contains its own filament transformer which
has, in addition to the filament winding, a winding to supply power
to a combination bias and keying relay circuit.
Withkey up, (open) the relay is not energized and the connection
between the 4-65A control grid and the 6Y6G control grid is open.
Under these conditions the fixed bias voltage is applied to the 4-65A
control grid and the 6Y6G plate current is large causing the 4-65A
screen-grid voltage to be low in value. (See Paragraph C-1c).
When the key is closed, the keying relay is energized and the
fixed bias voltage is cut off from the 4-65A grid circuit. One set of
the relay contacts closes the oscillator and intermediate cathode cir-
cuits to start the excitation voltage to the power amplifier grid, and
the other set of contacts closes the circuit to apply. the 4-65A grid
resistor voltage to the 6Y6G control grid to restore the 4-65A screen
grid voltage to normal. The circuit then operates as described in
paragraph 1-c.
C-if. Metering Circuits.
The meter has a one milliampere direct current movement with
external multipliers and shunts to read various voltages and currents
in the Transmitter. Selection of the circuit to be metered in accom-
plished by a double pole six-position switch operated from the Trans-
mitter front panel. Each metered circuit is indicated at the corres-
ponding switch position on the front panel.
C-lg. Band Switching.
The inductances in all stages are switched by one multiple pole
five -position ganged band switch. Two snap-action switches actuated
by a cam on the band switch shaft open the primary circuit of the high
voltage power transformer and the high voltage indicating panel light
when switching from one range to another. These switches close the
associated circuits only when the band switch is set exactly correct
for each band. This latter feature prevents the arcing and burning
of the band switch contacts during switching.
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C-1h. Power Supply.
The Power Supply requires an alternating current input of 115
volts at between 50 and 400 cycles per second.
With the key down, the power factor is 95% and the power re-
quired is 430 watts when the Transmitter is adjusted for 100 watts
power output. Overload protection is provided by a 5-ampere power
line input fuse. Do not use a higher value!
The Power Supply contains all the transformers, filter chokes,
and filter capacitors of the equipment with the exception of the fil-
ament-bias transformer, which is included in the Transmitter unit.
A pair of type 816 mercury vapor rectifier tubes are used for
the high voltage rectification, and a single type 5R4GY tube is used
for the lower "B" voltage rectification.. Both circuits are full-wave.
These two direct current sources are 1350 volts at 200 milliamperes
for the power amplifier stage, and 500 volts at 100 milliamperes for
the oscillator and intermediate amplifier stages. The plate trans-
former supplies alternating current power, from a center-tapped and
low "B" voltage tapped secondary winding to both rectifier circuits.
A separate dual secondary winding transformer supplies power for
the rectifier' filaments.
Filters for the two rectifier circuits consist of separate single
section inductance-capacitance filters, with choke input.
A time delay circuit is incorporated in the Power Supply to pre-
vent the application of the high plate voltages to the rectifier tubes
before the rectifier filaments have heated to operating temperature.
A time delay of one minute begins when the Transmitter filament
switch is turned on.
The time delay circuit consists of a temperature compensated
thermal time delay switch, a double pole direct current relay, and a
bridge type rectifier. The thermal switch contacts complete the re-
lay circuit after the one minute time delay. When the relay closes
its contacts, it opens the thermal switch heater circuit and holds it-
self closed by means of its contact circuit arrangement. This re-
lease of the thermal switch allows the switch to cool and reset itself.
One pair of the relay contacts completes the primary circuit of the
plate power transformer.
An interruption of the filament transformer primary circuit will
cause the relay to release. The time delay cycle will begin again upon
closing the filament primary circuit. An interruption of the plate
power transformer primary circuit, such as caused by operating the
"Plate" on-off switch or the band switch interlock switches, will not
cause the relay to release and recycle.
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The input power line cord and the output power cable which
carries power to the Transmitter are permanently attached to the
Power Supply and are provided with an internal rack for storage when
not in use.
A.service receptacle, separately fused for 2 amperes, is pro-
vided on the front of the Power Supply
The Primary circuit of the plate power transformer is inter-
locked to prevent flashover arcs across the band switch contacts by
means of a snap action switch actuated by a cam on the band switch
as described in paragraph C-lg.
C-li. Line Voltage Control Unit.
This unit is built into one end of the Accessory Unit and con-
sists of a 2000 volt-ampere Variac, switches, panel light, and outlet
receptacles. When the input line voltage is within the ranges of 90
to 140 volts or 180 to 280 volts, the Variac can be adjusted to give an
output voltage of 115 volts. A panel switch marked 115-230 selects
the proper operating range. Another switch turns the power input on
or off when operated. A panel light indicates when the input switch is
on.
A single receptacle is provided at the side of the cabinet for
power connection to the Power Supply unit, at 115 volts. A duplex ser-
vice receptacle, also at 115 volts, is provided at the side of the cab-
inetfor powering auxiliary equipment such as lights, etc., and is fus-
ed for 3 amperes. The input circuit to the Variac is fused for 10 am-
peres.
The Variac is calibrated 0 to 25 volts (output) each side of the
center position on the front panel, with the notation "increase voltage"
and "decrease voltage" in the proper directions. The Variac calibra-
tion is given only as an aid to setting the proper voltage. The exact
setting should be determined by referring to the meter on the front
panel of the Transmitter. Mechanical stops on the Variac prevent its
rotation beyond the plus or minus 25 volts limits.
D. Trouble Shooting.
D-1. General.
Schematic diagrams, parts lists, and photographs included in
this Instruction Book may be used as an aid in trouble shooting in this
equipment. Before attempting to service this equipment the preced-
ing information concerning circuit description should be studied thor -
outhly to learn how each stage operates. This knowledge is essential
before efficient servicing can be accomplished.
D-2. The tables of typical operating voltages and resistances, (Charts
1 and 2) may be used to localize the stage in which trouble occurs. It
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Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1
17
should be noted that Transmitter metering circuits can be used for
all measurements marked with an asterisk (*) on the charts. These
readings should be checked first when trouble shooting.
D-3. Repeated Fuse-Blowing
This trouble will normally be caused by defects such as short-
ed filter or by-pass capacitors, shorted wiring, or a short circuited
interconnecting cable. If, however, the 6Y6G tube becomes defective
or begins to lose emission, less screen grid voltage regulation pro-
tection is offered to the power amplifier tube and the high current
drawn will burn out the 5-ampere fuse in the Power Supply. Failure
to remedy this trouble will eventually damage the 4-65A tube. The
condition of the 6Y6G tube may easilybe checked by reading the pow-
er amplifier screen grid voltage which should not be greater than 50
volts in the key-up condition. Do not replace the 5-ampere fuse with
one of higher current rating.
D-4. Poor Keying Characteristics.
These may be caused by a number of factors. In the event of
sluggish keying, check for a crystal of low activity by substituting
another crystal and/or by replacing the 6AC7 crystal oscillator tube.
In the case of the presence of a backwave, check for high resistance
continuity of the keying relay contacts. If these are in good condition,
the trouble will probably be in the key thump electrolytic capacitor
C 14 which may have become leaky.
Poor regulation of the 6AC7 screen grid voltage caused by fail-
ure of the VR-150 regulator tube may cause a fault in the transmitted
signal which will cause it to sound "chirpy" when received.
D-5. Exciter Tracking.
The Transmitter has been adjusted at the factory for proper
tracking of the tuned circuits in the oscillator and intermediate am-
plifier stages. This adjustment is not particularly critical and nor-
mally will not get out of adjustment. If, after routine inspection and
checking of tubes and voltages, insufficient drive is experienced, the
trouble may be tracking, which can be adjusted as follows:
With the Transmitter "Tune -Operate" switch in the " Tune" posi-
tion, adjust the tracking capacitor C6 for maximum indication of pow-
er amplifier grid current at approximately 28 megacycles (7 mega-
cycles crystal). "Rock" the tuning capacitor while adjusting the track-
ing capacitor. This adjustment should provide ample excitation
throughout the frequency range of the Transmitter, but there may be
cases where it is desirable to affect a compromise in tracking between
approximately 23 and 28 megacycles.
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18 Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1
SYMBOL NUMBER
Cl, CIO
C2, C3, CII, C18, C20, C21
C4
C5, C13
C6
C7, C9, C12, C19, C22
C8
C14
C15, C17, C24
C16
C23
C25
C26
C27
C28
C29
C33
C34
R1, R7, R22
R2
R3
R4
R5, R9
R6
R8
R10
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20
R21
R23
R24
R25, R26
R30
R31
R32
RT-1-B PARTS LIST
TRANSMITTER UNIT
Capacitor,
Capacitor,
Capacitor,
Capacitor,
Capacitor,
Capacitor,
Capacitor,
Mica
Mica
Mica
Variable
Variable
Mica
Mica
Capacitor, Electrolytic
Capacitor, Mica
Capacitor, Mica
Capacitor, Variable
Capacitor, Electrolytic
Capacitor, Paper
Capacitor, Mica
Capacitor, Variable
Capacitor, Mica
Capacitor, Mica
Capacitor, Mica
Resistor, Carbon
Resistor, Carbon
Resistor, Carbon
Resistor, Wire Wound
Resistor, Carbon
Resistor, Carbon
Resistor, Carbon
Resistor, Wire Wound
Resistor, Carbon
Resistor, Carbon
Resistor, Carbon
Resistor, C arbon
Resistor, Carbon
Resistor, Carbon
Resistor, Carbon
Resistor, Carbon
Resistor, Carbon
Resistor, Carbon
Resistor, Carbon
Resistor, Wire Wound
Resistor, Carbon
Resistor, Wire Wound
Resistor, Carbon
Resistor, Carbon
Resistor, Carbon
DESCRIPTION
33mmf. ? 10% 500 W.V.
.01 mf. ? 20% 300 W.V.
22mmf. ? 10% 500 W.V.
140 mmf.
15 mmf.
.01 mf. ? 20% 500 W.V.
15 mmf. ? 10% 500 W.V.
5. mf. - 10% +150% 50 W.V.
.005 ? 20% 1000 W.V.
27 mmf. ? 10% 1000 W.V.
150 mmf.
5. mfd. -10% +150% 150 W.V.
.04 mf. -10% +20% 200 W.V.
.01 mf. ?10% 2500 W.V.
500 mmf.
.0004 mf. 1:10% 2500 W.V.
.001 mf. ?10% 500 W.V.
.01 mf. 20% 300 W.V.
47K ohms, ?10%, 1 Watt
300 ohms, ? 5%, 1 Watt
4.7 ohms, ?10%, 1 Watt
15K ohms, ?10%, 38 Watts
15K ohms, ?10%, 1 Watt
510 ohms, ?5%, 2 Watts
22 ohms, ?10%, 1 Watt
10K ohms, ?10%, 30 Watts
100K ohms, ?10%, 2 Watts
250K ohms, ?5%, 1/2 Watt
5100 ohms, ?5%, 1/2 Watt
510K ohms, ?5%, 1/2 Watt
15K ohms, ?5%, 1/2 Watt
100K ohms, ?5%, 1/2 Watt
51K ohms, ?5%, 1/2 Watt
470K ohms, ?10%, 1 Watt
820K ohms, ?10%, 1 Watt
11 ohms, ?5%, 1 Watt
1 Meg. ohms. ?10%, 1 Watt
5K ohms, ?10%, 18 Watts
100K ohms, ?10%, 1 Watt
50K ohms, ?10%, 50 Watts
1000 ohms, ?10%, 1 Watt
1000 ohms, ?5%, 1/2 Watt
10 ohms, ?10%, 1/2 Watt
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SYMBOL NUMBER DESCRIPTION
19
fl Jack, Key
LI Coil Assembly, Oscillator
L2 Coil Assembly, Intermediate Amplifier
L3 Coil Assembly, Power Amplifier
LMP-1 Light, Panel, Green (#47 Bulb)
LMP-2 Light, Panel, Red (#47 Bulb)
M-1 Meter, 0-1 Milliampere
RE-1 Rectifier, Meter, (Conant Type BHS-C)
RE-2 Rectifier, Selenium, (Federal 403D2787)
RFC-1, -2, -4 Choke, R.F., 2.5 mh., 100 ma.
RFC -3 Choke, Parasitic Suppressor
RFC -5 Choke, R.F., 1.0 mh., 150 ma.
RFC-6 Choke, R.F., 1.0 mh., 400 ma.
RLY-1 Relay, Keying, D.P.D.T. 6300 ohms D.C.
SO-1 Socket, Coax. Connector, (V.F.O. Input)
S0-2,-3 Sockets, Crystal
SO-4 Socket, Male, 6 contact
SO-5 Socket, Banana Jacks (Ant. Terminals)
SO-6 Socket, High Voltage Connector
SW-1 Switch, Toggle, D.P.D.T. (Xtal-V.F.0.)
SW-2 Switch, Toggle, D.P.S.T. (Plate)
SW-3A Switch, Snap Action, S.P.S.T. (Plate Interlock)
SW-3B Switch, Snap Action, S.P.S.T. (Panel Light Interlock)
SW-4 Switch, Toggle, S.P.S.T. (Filament)
SW-5A,-5B Switch, Wafer, 2P.6T. (Meter)
SW-6A Switch, Wafer, 1P.5T. (Oscillator)
SW-6B Switch, Wafer, 1P.5T. (Intermediate Amplifier)
SW-6C Switch, Wafer, 1P.5T. (Screen Bleeder)
SW-6D---G Switch, Wafer, 4P.5T. (Power Amplifier)
SW-7 Switch, Cam Operated, S.P.S.T. (Ant. Load)
SW-8 Switch, Toggle, S.P.S.T. (Tune Operate)
T-1 Transformer, Filament and Bias
TS-1 Terminal Strip, (Keying)
V-1 Tube, JAN-6AC7
V-2 Tube, 2E26
V-3 Tube, 4-65A
V-4 Tube, IAN-VR-150
V-5 Tube, JAN-6Y6G
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20 Declassified and Approved For Release 2013/07/08 : CIA-RDP78-03561A000200070001-1
POWER SUPPLY UNIT
SYMBOL NUMBER DESCRIPTION
C-30A, C-30B
C-31
C-32
F-1
F-2
L4
L5
PL -1
PL -2
PL -3
R-27
R-28, R-29
RE-3
RLY-2
RLY-3
SO-7
T-2
T-3
V-6
V-7, V-8
ACCESSORY UNIT
F-3
F-4
LMP -3
PL -3
SO-8
SO-9
SW-9
SW-10
T-4
Capacitor, Paper, .1-.1 mf. -10%
+20%, 600 W.V.
Capacitor, Oil Filled, 2 mf. 2500 W.V.
Capacitor, Oil Filled, 4 mf. 1000 W.V.
Fuse, 2 Amperes
Fuse, 5 Amperes
Choke, Filter, 10 Henries, 100 ma.
Choke, Filter, 10 Henries, 200 ma.
Plug A.C. Standard
Plug, Female, 6 contact
Plug, High Voltage Connector
Resistor, Wire Wound,40K ohms, ?10%
110 Watts
Resistor, Wire Wound, 50K ohms, ?10%
110 Watts
Rectifier, Full Wave Bridge
Relay, 95 V.D.C., D.P.D.T. (H.V. Primary)
Relay, Time Delay Switch (60 Seconds)
Socket, (A.G. Service Receptacle)
Transformer, High Voltage
Transformer, Filament
Tube, JAN-5R4GY
Tube, JAN-816
Fuse, 10 Amperes
Fuse, 3 Amperes
Light, Panel, Amber, (115 Volt Bulb,
Mazda #6S6)
Plug, A.C. Input
Receptacle, A.C., Single
Receptacle, A.C., Dual
Switch, Toggle, D.P.S.T. (On-Off)
Switch, Toggle, S.P.D.T. (115-230)
Variac, (General Radio #V-20 Ohm)
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Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1 21
TYPICAL RESISTANCE MEASUREMENTS
SOCKET TERMINALS TO CHASSIS
TUBE
PIN
RESISTANCE
BAND 1 - 2
IN OHMS
BAND 3
BANDS 4 - 5
6AC7
1
2-7
3-5
4
6
8
0
11
5K
47K
42.7K
27.7K
0
11
5K
47K
44K
29K
0
11
5K
47K
65K
50K
2E26
1-4-6
2-7
3
5
8
Plate Cap
5.2K
11
13K
15K
0
25.7K
5.2K
11
17.9K
15K
0
26.6K
5.2K
11
97K
15K
0
40K
6Y6G
1-6
2-7
3-4
5
5
8
00
11
125K
(On Operate) 105K
(On Tune) 0
co
11
125K
105K
0
0
oo
11
125K
105K
0
0
VR-150
2
3
5
7
0
co
42.7K
co
0
co
44K
co
0
co
65K
co
4-65A
1-7
2-6
4
Plate Cap
11
125K
1M
100K
11
125K
1M
100K
11
125K
1M
100K
CHART 1
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22 Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1
TYPICAL OPERATING VOLTAGES AND CURRENTS
KEY DOWN
KEY UP
STAGE
MEASUREMENTS
BANDS
BANDS
BANDS
BANDS
1-2-3
4-5
1-2 -3
4-5
6AC7
Plate Volts
300
300
350
380
Oscillator-
Screen Grid Volts
150
150
150
150
Frequency
Filament Volts
6.3
6.3
6.3
6.3
Multiplier
Cathode Volts
2.5
2.5
12
47
*Cathode Current
7.5
7.5
0
0
Plate Volts
500
500
550
550
2E26
Screen Grid Volts
60
180
80
370
Intermediate
Filament Volts
6.3
6.3
6.3
6.3
Amplifier
Cathode Volts
12
25
12
50
*Cathode Current
20
47
3
10
Plate Volts
1350
1350
1450
1450
4-65A
* Screen Grid Volts
275
235
45
50
Power
Filament Volts ,
6.3
6.3
6.3
6.3
Amplifier
*Plate & Screen Cu.
175
175
0
0
* Grid Current
15
18
0
0
6Y6G
Screen
Plate Volts
275
235
45
50
Voltage
Regulator
Filament Volts
6.3
6.3
6.3
6.3
1. All of the above measurements were taken with a Power
Line voltage of 115V, and a Frequency of 60 cycles per
second with a 20,000 ohms per volt meter.
NOTES:
2. Measurements marked with an asterisk (*) indicated by
Front Panel Meter.
CHART 2.
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Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1 23
ACCESSORY UNIT OPERATING INSTRUCTIONS
The Accessory Unitis designed to supply to the Transmitter and Power
Supply an output of 115 volts (AC) when operating from a line voltage be-
tween 90 and 140 volts or between 180 and 280 volts, for any line fre-
quency between 50 and 400 cycles per second.
1. Before connecting the Accessory Unit to the power line, do the
following:
(a) Connect the Power Supply to the Accessory Unit and to the
Transmitter.
(b) Set the Transmitter FILAMENT and PLATE switches to the
OFF position, and the METER switch to position 1.
(c) Set the Accessory Unit ON-OFF switch to OFF, the 115-230
switch to 230, and the Variac knob to the center position.
2. Connect the Accessory Unit to the power line.
3. Turn ON the Accessory Unit ON-OFF switch, and read the line
voltage on the Transmitter meter.
4. JI the Transmitter meter indicates between 90 and 140 volts, then
the power line voltage is in the 180 to 280 volt range and the Ac-
cessory Unit 115-230 switch is in the correctposition. Rotate the
Variac knob until the Transmitter meter reads 115 volts.
5. If the Transmitter meter indicates less than 90 volts after opera-
tion 3, above, then the power line voltage is in the range between
90 and 140 volts, and the 115-230 switch must be set in the 115
position. Rotate the Variac knob until the Transmitter meter in-
dicates 115 volts.
6. The Transmitter may now be set up for operation.
WARNING: FAILURE TO OBSERVE THE ABOVE INSTRUCTIONS IN
THE EXACT SEQUENCE GIVEN, MAY RESULT IN SERIOUS DAMAGE
TO THIS EQUIPMENT.
Figure 2
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24 Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1
RT-1-B TUNING INSTRUCTIONS
WARNING; BEFORE TURNING THIS UNIT ON, READ INSTRUCTIONS Freq. Band. Excit.
FOR ACCESSORY UNIT AND ADJUST THAT UNIT FOR 115 VOLTS OUT-
PUT.
1. Set TUNE-OPERATE switch in TUNE position; set XTAL INPUT-VFO
switch to XTAL INPUT position; set METER switch to position 2; set
BAND switch in accordance with tuning chart; plug crystal into XTAL
socket.
2. Turn on FILAMENT and PLATE switches. A time delay relay in
Power Supply keeps high voltage off for one minute after FILAMENT
switch has been turned on.
3. Set EXCITATION and POWER AMPLIFIER tuning controls to dial
readings indicated in tuning chart, and set ANTENNA LOADING control
to TUNE position.
4. Retune EXCITATION control slightly if necessary for maximum meter
reading; current should be over 12 milliamperes.
5. Turn METER switch to position 3 and retune POWER AMPLIFIER
control slightly for minimum meter reading. There should be a de-
finitely perceptible dip in meter reading at correct setting of POWER
AMPLIFIER control.
6, Turn ANTENNA LOADING control to right, increasing loading sim-
ultaneously as POWER AMPLIFIER control is tuned for minimum current.
For initial adjustment, meter should read 60 ma. Do not load above this
PA.
3.0
1
12
22
3.5
1
44
50
4.0
1
65
68
4.5
1
79
80
5.0
1
89
89
5.0
2
16
32
5.5
2
36
49
6.0
2
52
61
7.0
2
72
76
8.0
2
85
88
8.0
3
14
27
9.0
3
37
48
10.0
3
56
61
11.0
3
67
71
12.0
3
76
79
13.0
3
83
85
13.0
4
25
48
14.0
4
39
57
16.0
4
57
73
18.0
4
71
83
21.0
4
85
93
21.0
5
33
49
22.0
5
41
55
24.0
5
55
66
26.0
.5
65
74
28.0
5
72
80
30.0
5
79
86
current. If turning ANTENNA LOADING control to the right does not increase current suffi-
ciently, then turn this control to the left of TUNE position.
7. Set TUNE-OPERATE switch to OPERATE position. Retune POWER AMPLIFIER control
for minimum current.
8. Continue loading operation started in No. 6 For maximum power output meter should read
175 ma. Do not load above this current.
METER SWITCH
Position Full Scale Position Full Scale
1
250v
4
500v
2
50 ma
5
50 ma
3
500 ma
6
100 ma
Figure 3
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Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1
4,13.-. INS-19993,9-0
0943 4,149413S999 9 MA uN1T ON, 1/14.,1; 1N11.19, A J5913,
r AN, AND .399419.14 NIA l'AuT 0014 NA (09 ; ;
Pouu, U'C'PC'
4,3913,19 to,,,
3, 190 EXCITAT4i,
19; TO9431 4.0005-o,
4, MA1.40; (15(5> Si Ku; -
4,4415544, u05;44 .50555A >5?
A. 1054/9 1393,1919
coarut >1139,9019
11391,13 5r9-99,9909319
AMPLIFIER ; rua AA
>1550,1>55 53151.51341;
1091395 00,0?
AA AA o31;99A, ; ?A ; ;
7. ArAt 11943,0434. ICC (3. ..A ; ; /13.99 9
RADIO TRANSMITTER
MODEL RT.1-8
sentm mct
1,111/1111Atino/041 .11,1*: t4411:1 11031,?*
i
PSC {AIN NIA
!At #3411 WPM/
4 i
2 5
- ? - - .
OPE:, RATE'
RADIO TRANSMITTER RT -1 - B
FIGURE 4 FRONT VIEW
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25
26 Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1
RADIO TRANSMITTER RT -1 - B
FIGURE 5 REAR VIEW
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Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1
27
RADIO TRANSMITTER RT -1 -B
FIGURE 6 TOP VIEW
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28 Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1
RADIO TRANSMITTER RT -1 - B
FIGURE 7 RIGHT SIDE VIEW
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Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1 29
RADIO TRANSMITTER RT -1 - B
FIGURE 8 LEFT SIDE VIEW
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30 Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1
RADIO TRANSMITTER RT -1 - B
FIGURE 9 BOTTOM VIEW
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Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1
r7,

c\J
1 co d
>-? i u.
J 0 2
0
44C r?j
(
. e
_11 >OD
I 0 o a
-t1 rr.-ctz
0_
o
4r)
d ?111.6
re) 2 (7) 2
U c`J
?
co a)
(\1 (\1
CC CC
El 0 01
I I 6 L
0 0
CNITI
POWER SUPPLY FOR RADIO TRANSMITTER RT-1-B
FIGURE 14 SCHEMATIC DIAGRAM
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35
36 Declassified and Approved For Release 2013/07/08 CIA-RDP78-03561A000200070001-1
3/111.503
the Aott 3tkote,e00 a ,30tkly lath. fl nal i'aa'a
940093-031 0ttaitl5 Ida0 i8011 kotote optki-e
Meet, 90 594.140 400.3., tar t401,,,,,, tIP at 21th et.
heMetth P.) WI* 400.r ytkIett /too :tot ke0
nottore COSIIIttetirth tho Ace, oo.,0-,o 15-ot to kho 0kwo
00 Connect Do Ranter.15.4019 to the 3,533/5kol,/,-
mitter.
? 033 5e1 the Teetmuttkkor 341.3 595N61 .031 Rt?-vt,. on I aOa.ar 1., th,.op
hoo0114k, 300 the 5110011 ow it oh to pokitokk, k.
ft') SO 3053,-ort 139 ON ,001.1 k3/39311,, 01-11, tho 05 -1330 owiteh
to 230, 1010 the 31-ar Pt heel, te I he te,11,1 ett,ttlott
Coon...et the Attetetthetry Chit, tO the howor /the.
Titto ON the Acet,eockry 1.3t3 ON-OFF k?witth, ,ktkki 30toke, rot,/ Ow 905
v011110,4/ tan the-Teatteet: Wee ;hetet'.
4, If the Tr:kat:tomer natta Oekkotto het51, coo -191 ?to3 140 se.
pow, line voltage to in 113. 180 1,, .180 volt 3 3t.et? 3od I ho Pat nfl
? tkott (13-230 ow/9h to lo lith erteeert tee,ttlee. ththate the Pa opt anob
0903 tho Tr:MS.111er thetee rt.& lot-alt -
il If th1 Tntietteittee reeler toklitotooko th,ot kket kotle,-kfter otter:0ton 3,
119-0o, theeitho pnvvt- itokk 50/3.0. it in ra tato- bototk/ok 90 and 140
190,, .103 the fl 5 230 kk tat koo/./ hat -t9 ta ho 115 pkootkala ettgitte
? the 03.143/ kw-W/030 tile -I r3,,tokitter 0-03/3 tottiotto3 115 volt...
o. The Tekktotnitter ntay kokw ho no for opoot Ikon,
WM/NINO, 411.8191/ To 010110331, THE 3100 INS-111111CTIONS IN 1(11
EXACT 31-331"1/NCE 811011.. tally It at T IN 0O111053 DAMAGE TO THIS
EC31.1PMEN I.
1313511 191-1
funk'
ACCESSORY UNIT
RT-38 TRANSMITTER
se:499 00 NM
ACCESSORY UNIT FOR RADIO TRANSMITTER RT=1-B
FIGURE 15 FRONT VIEW
Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1
Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1 37
TRAP4R#747TER W4-7-8
4RPREAT SPARS
PART RooRER qOA PA, RAW DE.E04706
$70.54 4 4.40 8704 e2,,thuatl4 47:
...ER 4 7.07 8074 RE (AIWA ORR
,4422, . 7771E RAW 570 WOREEPRE4 SAM
,E74242. 0 47.44 ERR RR. t4ERIEP47.7 UPI
,00003? 0 POSE MAW ARE trOPPRREE REP
i20-038 0 4770E RAMP 400 ,ERRERER PAM
720-0. 77045 7705 44C7
o25-1040 TAME ' TYR RUE
3344 4 RA
05040 7707 77.4 0704.0
004045 TAR TYPE REE.
4274-044 2 TARE TYPE ER
,o44847 TIRE 1447 PEAR
,00-014 RE, AT 0.11340 77 7 ER. ORES
077737E PARRA
RR DEE 8450000
-? '01
043
.4,7* POOP 80*044
?
ACCESSORY UNIT FOR RADIO TRANSMITTER R T -1-B
FIGURE 16 REAR VIEW
Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1
38 Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1
ACCESSORY UNIT FOR RADIO TRANSMITTER RT-1-B
FIGURE 17 VIEW OF VARIAC
Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1
Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1 39
PL-3
INPUT
90-140 V.
OR
180-280 V.
50
F4
3 A.
?cc-\9_?.9:9
DUPLEX
SERVICE
RECEPTACL
MAIER PILOT TRANS. RECEPT. 115V.
TRANSMITTER R T?I?B
ITEM
PART NUMBER
DIRECT EQUIPMENT SPARES
QUA. PART NAME DESCRIPTION
1
125-1159
4
LIGHT BULB
6.3V. (MAZDA 47)
2
125-1832
4
LIGHT BULB
115 V. (MAZDA 6S6)
3
125-1221
10
FUSE
5 AMP. MTH (FORMERLY 3AG)
4
125-1222
10
FUSE
2 AMP. AGC (FORMERLY 3AG)
5
125-1837
10
FUSE
10AMP. ABC (FORMERLY 3AB)
6
125-1838
10
FUSE
3 AMP AGC (FORMERLY 3AG)
7
125-1841
1
TUBE
TYPE 6AC7
8
125-1842
1
TUBE
TYPE 2E26
9
125-1843
1
TUBE
TYPE 4-65A
10
125-1844
1
TUBE
TYPE VR-I50
I I
125-1845
1
TUBE
TYPE 6Y6G
12
125-1846
2
TUBE
TYPE 816
13
125-1847
I
TUBE
TYPE 5R4GY
14
125-1790
1
RELAY
KEYING D.P.D.T. 6300 OHMS.
15
125-1917
4
PLUGS
DOUBLE BANANA
16
125-1161
1
KNOB
1-1/2" MOLDED BAKELITE
17
125-1162
I
KNOB
I" WITH POINTER
18
125-1943
1
KNOB
2-1/16" POINTER
19
125-2046
1
CONNECTOR
COAX ,MALE
20
125-2179
1
ADAPTER
COAX
ACCESSORY UNIT FOR RADIO TRANSMITTER RT-I-B
FIGURE 18
SCHEMATIC DIAGRAM
Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1
Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1
NOTES
Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1
Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1
NOTES
Declassified and Approved For Release 2013/07/08: CIA-RDP78-03561A000200070001-1