THE RP-49 IS A MINIATURE POWER SUPPLY DESIGNED TO PERMIT OPERATION OF THE RT-49 TRANSMITTER FROM A BATTERY CAPABLE OF SUPPLYING 12 VOLTS AT APPROXIMATELY 5.5 AMPERES.

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03330A000700110001-7
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 10
• Document Creation Date: December 27, 2016
• Document Release Date: May 29, 2014
• Sequence Number: 1
• Content Type: REPORT

Declassified in Part - Sanitized Copy Approved for Release 2014/05/29: CIA-RDP78-03330A000700110001-7
STAT
Declassified in Part - Sanitized Copy Approved for Release 2014/05/29: CIA-RDP78-03330A000700110001-7
Declassified in Part - Sanitized Copy Approved for Release 2014/05/29: CIA-RDP78-03330A000700110001-7
RP-49
Power Supply
Operating Instructions
Declassified in Part-Sanitized Copy Approved for Release 2014/05/29: CIA-RDP78-03330A000700110001-7
IDeclassified in Part - Sanitized Copy Approved for Release 2014/05/29: CIA-RDP78-03330A000700110001-7
A. INTRODUCTION
The RP-49 is a miniature power supply designed to permit operation
of the RT-49 transmitter from a battery capable of supplying 12 volts
at approximately 5.5 amperes.
B. DESCRIPTION OF CONTROLS AND SW ITCHES
1. POWER OFF-ON Switch (1)
The Power Off-On switch is used to turn the power to the
transmitter on or off. Twelve volts DC is supplied to the
receiver power connector (2) and the keyer socket on the
transmitter regardless of the switch position.
2. Battery Test Meter (4)
The Battery Test Meter provides an indication of the state
of charge of the 12 volt battery. The meter readings are
valid only when the transmitter is being keyed and mean
the following:
Green: Battery charged.
Yellow: Battery voltage is approximately II volts
and very little transmit time remains.
Red : Battery is discharged and transmission
should cease. NOTE: Continued operation
in the "red" seriously endangers battery
life and must be avoided.
C. PREPARATION FOR USE
I. Turn the POWER OFF-ON switch (1) off.
2. Connect the battery to the INPUT 12 VDC connector (3) with
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the power cable.
3. Connect the transmitter connector (5) to the RT-49 and latch
together with the slide latch located on the RT-49.
4. If a common transmit/receive power supply and antenna
system is desired, connect the receiver to the receiver power &
antenna connector (2) with the auxiliary power & antenna cable.
D. USE
I. After completion of the steps in paragraph C, turn the
POWER OFF-ON switch (I) on prior to transmitting.
2. This switch should be turned to the OFF position to conserve
battery power when the transmitter is not actually being keyed. The
automatic keyer and receiver will still be operative.
E MAINTENANCE
? Due to the miniaturized construction of the power supply, no
maintenance should be attempted. The power supply should be re-
turned to base for exchange.
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Declassified in Part - Sanitized Copy Approved for Release 2014/05/29: CIA-RDP78-03330A000700110001-7
Power Cable
Auxilliary Power & Antenna Cable
"ella
Alligator Clips
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/
STAT
STAT
Declassified in Part - Sanitized Copy Approved for Release 2014/05/29: CIA-RDP78-03330A000700110001-7
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RR-48A Receiver
A. INTRODUCTION
The RR-48A is a four-channel, crystal-controlled radio receiver
operating in the frequency range of 3.5 to 12 megacycles. Crystal-
controlled means that crystals must be used to receive signals; four-
channel operation means that any one of four channels may be used by
the adjustment of the channel selector switch. The RR-48A will re-
ceive Morse code, tone, or voice signals. The receiver is powered
by a single 1.5 volt AA type (PENLITE) battery.
B. DESCRIPTION OF CONTROLS AND SWITCHES
1. Channel Selector Switch (3).
a. The channel selector switch is used to receive any one
of the four channels. The red tip of the switch is positioned
directly underneath the number of the desired channel.
b. Channel 1 is normally used with separate crystals that
are inserted into the crystal socket (8) on top of the receiver.
c. Channels 2, 3, and 4 are used with crystals that are
installed inside the receiver casing.
d. You may be issued an RR-48A that has had the crystal
socket (8) removed and the small holes plugged. If so, channel 1
has a crystal installed inside the receiver and channel 1 is then
used in the same manner as channels 2 through 4. When all four
channels have crystals installed inside the receiver, separate
crystals will not be provided.
2. BFO Control (6).
The BFO control is used to receive Morse code signals.
The index marker on the control is adjusted to the right or left
of the center BFO marker to receive Morse code signals. The con-
trol is turned OFF to receive tone or voice signals.
3. ON-OFF and Gain Control (9).
The ON-OFF and Gain control is turned in the direction of
the MAX GAIN arrow to turn the receive ON, and is adjusted to its
full stop to receive the loudest signal. The control is colored
black in the OFF position and yellow in the ON position.
1
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4. Tuning Dial (10) and Tuning Control (11).
a. For a desired chnnnel of operation, the tuning control
is adjusted until one of the numbered segments of the tuning dial
is positioned underneath the hairline indicator. Numbers 20
through 25 are shown in the tuning dial window, and each number is
divided into four segments.
b. You will be provided with the tuning dial numbers
corresponding to channels 2, 3, and 4, and to additional crystals
that may be used in channel 1.
C. TO INSERT THE BATTERY
Unscrew the battery cap (5) and insert the battery with the
plus (4-) side facing the front of the receiver. The minus (-)
side of the battery is placed against the spring inside the battery
compartment. After inserting the battery, replace the battery cap.
D. OPERATING THE RECEIVER.
1. Depress the white ANT button and insert the antenna wire
in the antenna terminal (1). Depress the black GND button and
insert the ground wire in the ground terminal (2). A ground wire
is not necessary to operate the receiver, but is often helpful.
2. Plug the headphones to the phones terminals (4).
3. Set the channel control switch to the desired channel. If
channel 1 is used, select the desired crystal and insert it into
the crystal socket (8).
4. Adjust the tuning control (11) until the tuning number of
the desired channel (or crystal) appears below the hairline indica-
tor in the tuning dial window. For instance, channel 2 may be
assigned the tuning number 22.5. Therefore, set the tuning control
mid-way between 22 and 23.
5. Set the BFO control to OFF to receive voice or tone signals.
Set the control to the BFO index mark to receive Morse code signals.
6. Turn the ON-OFF control in the direction of the MAX GAIN
arrow until a rushing noise is heard in the headphones.
2
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7. Adjust the gain control to a comfortable listening
then slowly rotate the tuning control to the right and to the left
until the desired signal is heard the loudest and clearest. For
Morse code signals, the BFO control may be adjusted to the right
or left to change the pitch of the signal.
E. TO TURN THE RECEIVER 01,1..
To turn the receiver off, rotate the ON-OFF switch in the
direction of the OFF arrow until a click is heard. When the
receiver is OFF, the ON-OFF control will be colored black. For
storage periods of over one week, remove the battery from the
receiver battery compartment.
F. MAINTENANCE
There are no component spare parts supplied with, nor is there
any maintenance to be performed for, the RR-48A. Most of the
circuits are on printed boards and the set is fully transistorized.
If the simple trouble checks given below do not clear a trouble,
any repairs deemed necessary may be performed.
G. CHECKING TROUBLES.
1. No sound is heard in the headphones.
a. Check to determine that the battery cap is screwed
firmly in place and that the battery is making a good connection.
Check to determine that the battery is correctly inserted in the
battery compartment.
b. Replace the battery.
c. Check the headphones by momentarily touching the phone
cord tips to the terminals of the receiver battery. When the
phones are momentarily touched across the battery, a click in the
headphones indicates that the phones are not defective.
2. The receiver operates, but the signals are weak.
a. Replace the battery.
b. Check the complete antenna system to insure that no
part of the antenna or lead-in wire is grounded. (Grounded means
making an electrical connection with the earth.) Also, check to in-
sure that all antenna connections are making good electrical contact.
3
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Declassified in Part - Sanitized Copy Approved for Release 2014/05/29: CIA-RDP78-03330A000700110001:7
RR-48A Receiver
1.
Antenna Terminal
7.
AA (PENLITE) Type Battery
2.
Ground Terminal
8.
Crystal Socket
3.
Channel Selector Switch
9.
ON-OFF and Gain Control
4.
Phones Terminals
10.
Tuning Dial
5.
Battery Cap
11.
Tuning Control
6.
BFO Control
Declassified in Part - Sanitized Copy Approved for Release 2014/05/29: CIA-RDP78-03330A000700110001-7