RR-2B RECEIVER AND PS-4 POWER CONVERTER

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03330A000600490002-6
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 9
• Document Creation Date: December 27, 2016
• Document Release Date: May 29, 2014
• Sequence Number: 2
• Content Type: REPORT

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RR-2B Receiver
and
PS-4 Power Converter
A. INTRODUCTION
1. The RR-2B is a small six-tube communications receiver capa-
ble of receiving voice, Morse code, and other radio signals within
a frequency range of 3000 to 24000 kilocycles. Signals can be tuned
at any frequency within the receiver range on any one of the three
frequency bands. Single frequency reception is also provided by in-
sertion of a receiving crystal. The receiver casing is constructed
for rough handling and the receiver is completely waterproof with or
without cover in place.
2. The PS-4 is an adaptor that permits operation of the 1RR-2B
from any 12 volt DC source. The PS-4 may be plugged directly to a
compatible transmitter, or connected to a 12 volt battery with the
power cable provided. When the PS-4 is plugged directly to the
transmitter and connected to the receiver, the transmitter supplies
the DC power and the antenna, ground, and audio connections for the
receiver.
B. CONNECTION TO A COMFATIRLE TRANSMITTER
1. Plug the PS-4 into the receiver socket on the transmitter.
2. Plug the RR-2B power cord into the four-pin socket on the
PS-4.
3. Using the three-wire color coded cable, make the following
connections from the PS-4 to the RR-2B: First plug the wires in
proper color sequence to the three color coded sockets shown in
Illustration 2, line 1. Now refer to Illustration 1. Connect the
blue tipped wire to the ungrounded side of the PHONES terminals (6);
the black tipped wire to the ground terminal (9); and the yellow
tipped wire to the antenna terminal (10). To make the connections
to the receiver, press down on the top of the terminal post, insert
the tip of the wire into the hole in the side) and release the post.
The wire will then be held securely in place.
4. The blue tipped wire is connected to the ungrounded side of
the PHONES terminal only when an automatic printer is used and
plugged into the transmitter. The connection is made to feed the
audio signal from the receiver, through the transmitter, and to the
printer. If the printer is not used, the connection is not made to
the receiver; instead, headphones would be plugged into both PHONES
terminals (5).
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5. Before signals can be heard on the receiver, an antenna and
a ground must be connected to the transmitter in accordance with the
transmitter instructions.
C. CONNECTION TO A 12 VOLT BATTERY
1. Refer to Illustration 2. Connect the power cable (4) to the
nine-pin plug (3) on the PS-4. Connect the alligator clip of the
red wire to the positive (4.) battery terminal, and the alligator
clip of the black wire to the negative (-) battery terminal. The
PS-4 will not operate if the battery connections are reversed.
2. Plug the RR-2B power cord into the four-pin socket on the
PS-4.
3. When the PS-4 is not plugged into a transmitter, separate
connections must be made directly to the receiver for the antenna,
ground, and audio (if necessary). See your instructions regarding
the erection of an antenna and installation of a good ground.
Referring to Illustration 1, the antenna lead-in is connected to
terminal 10 and the ground lead-in to terminal 9. Remove a small
bit of the insulation from the wires before inserting them in the
terminal post connections. If an automatic printer is used, audio
connections from the printer will be made directly to the receiver
as outlined in the printer instructions. If the printer is not
used, headphones are connected directly to the PHONES terminals(5).
D. CONNECTION TO A DRY BAiihRY PACK
Any dry battery pack capable of delivering 90 volts at 20
milliamperes, 11 volts at 300 milliamperes, and with a socket to
fit the RR-2B power plug may be used to power the receiver. You
may be provided with a dry battery pack such as the Burgess 4TA60
or 6TA60. If a dry battery pack is used, the PS-4 is not used.
Instead, the receiver power plug (3) plugs directly into the battery.
Separate connections must then be made to the receiver for the
antenna, ground, and audio (if necessary).
E. UNDERSTANDING 1HE MEGACYCLE
Since the RR-2B frequency dial is marked in megacycles (MC),
this unit must be understood. Normally, frequencies on signal plans
are given in kilocycles (KC); 1000 KC equals 1 MC. Merely move the
decimal point three places to the left to convert kilocycles to mega-
cycles. For instance, a frequency of 6322 KC would be converted to
6.322 MC and 18454 KC to 18.454 MC.
F. DESCRIPTION OF RR-2B CONTROLS AND SWITCHES
Refer to Illustration 1.
1. Frequency Range Switch (11). This switch is set on one of
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three numbers, depending upon the frequency that the receiver is to
be tuned to: position 1 for frequencies between 3.0 and 6.0 MC;
position 2 for frequencies between 6.0 and 12.0 MC; and position 3
for frequencies between 12.0 and 24.0 MC.
2. Tuning Knob (7) and Tuning Dial (8). The tuning knob is
rotated to tune the frequency as read on the tuning dial in mega-
cycles. The upper scale in the window is merely a reference scale
and is divided into 180 equal parts. The lower scale is a direct
reading of the frequency in megacycles. Each dial segment is equal
to one tenth of a megacycle and the numerals indicate the frequency
reading in megacycles. Rotation of the tuning knob causes the
tuning dial to sweep past the red hair-line indicator visible in the
tuning dial window. Tuning is accomplished by rotating the tuning
dial until the desired frequency, expressed in megacycles, appears
on the tuning dial directly under the red hair-line indicator. The
upper reference scale can be used for logging a previously used
frequency for future use.
3. Power ON-OFF and Gain Control (2). This control turns the
receiver on and off and regulates the volume level of received
signals. Clockwise rotation causes the volume level to increase and
rotation in the opposite direction causes the volume level to decrease.
When the control is turned to BATT. OFF position, a click can be heard
and the power to the receiver is turned off. NOTE: The switch does
not turn off the power to the PS-4. The PS-4 can be turned off only
by unplugging the unit from the transmitter, or by removing the battery
connections.
4. Beat Oscillator Control (4). This control is turned on to
receive Morse code signals. It is turned off to receive voice, music,
or tone modulated signals.
5. Crystal Oscillator Socket (1). When receiving crystals are
used, a crystal is plugged into this socket. The receiver will then
receive only on the crystal frequency.
G. PREbnaING nib RECEIVER CONTROLS
1. Turn the GAIN control counterclockwise to BATT. OFF position.
2. Connect power source) antenna, ground, and phones (or audio)
as instructed above.
3. Turn the GAIN control about 2/3 turn clockwise, or until a
rushing noise is heard in the phones.
4. Set the range switch to the number corresponding to the de-
sired frequency range. For instance, the range switch would be set
to position 3 for a frequency between 12 and 24 MC.
5. Rotate the tuning knob until the frequency in megacycles is
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directly underneath the red hair-line indicator on the tuning dial.
6. If crystal operation is to be used, insert the crystal into
the crystal oscillator socket. Otherwise, omit this step.
7. For reception of Morse code signals, rotate the beat osc.
control somewhere near the zero (0). For reception of voice or tone
modulated signals, rotate the beat osc. control to the OFF position.
H. TUBING THE SIGNAL
1. SLOWLY rotate the tuning knob first in one direction, then
in the other direction until the desired signal is heard. You may
find that the desired signal is to the right or to the left of the
Indicated mark on the dial.
2. After the signal is heard, very mom and CAREFULLY adjust
the tuning knob until the signal is heard as clear and loud as
possible.
3. For reception of Morse code signals, adjust the beat OSC.
control to the right or left to vary the tone of the signal.
4. Adjust the gain control to a level necessary to copy the
signal. When other radio signals interfere with the desired signal,
a lower volume level may help to copy through the interference.
When the desired signal intensity increases and decreases, adjust
the gain control for best listening at the lowest level of the signal.
5. If the signal appears to slowly move away from its frequency
setting, it may be necessary to VERY SLIGHTLY readjust the tuning
knob. During interference from other signals, slight adjustment of
the tuning knob, or adjustment of the beat osc. may help improve re-
ception.
I. CHECKING THE ACCURACY OF THE TUNING DIAL
1. The RR-2B is a stable receiver and the frequency will USlIally
be found close to the reading on the tuning dial. Occasionally,
however, because of electrical malfunctions or mechanical shock, the
receiver may be off frequency more than a normal amount. Accuracy of
the tuning dial may be checked by listening to a frequency standard
transmission. Throughout the world many stations broadcast a continu-
ous frequency standard signal on 5, 10, 15, and occasionally on 20
MCS. Signals can be usually heard with the BEAT OSC. either OFF or
ON. A tone signal can normally be heard, and most stations broadcast
a voice transmission periodically. Some of the many stations trans-
mitting are: Washington, USA (WWV); Honolulu, USA (WWVH); Tokyo, Japan
(JJY); Peking, China (BPV); Moscow, USSR (RWM); Rugby, England (MSF);
and Buenos Aires, Argentina (LOL).
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2. The receiver can be tuned to one of the frequency standard
stations to determine how far off the receiver tuning dial may be.
To hear weak standard signals, it may help to turn the BEAT OSC. to
the 0 mark. (ON). To listen to tone signals or voice transmission,
the BEAT OSC. must be off.
3. The frequency standard stations also give time checks.
Normally, the tone leaves the air for about 20 seconds and returns
to indicate the time every 10 or 20 minutes, on the half hour, or on
the hour. Usually, a voice transmission is made to give the local
time.
J. TUBE REPLACEMENT
1. The metal case must be removed to replace the tubes. First
remove the 20 screws which are located around the edges of the top
of the receiver. Next, remove the dessicator by unscrewing the
large slotted screw on the side of the receiver. The panel and re-
ceiver unit may then be gently lifted out of the metal case.
2. Remove the metal shield covering a tube by pressing on the
shield and turning it counterclockwise. The tube may be gently
rocked from side to side during removal, but do not rock the tube
excessively as the glass envelope of the tube may fracture. Tubes
should be replaced one at a time to avoid placing a tube in the
wrong socket.
K. CHECKING TROUBLES
1. No sound is heard in the headphones.
a. Check all connections at the battery. Check that the
plugs to and from the PS-4 are properly plugged in. If possible,
check the battery voltage at the transmitter.
b. Check the headphones by momentarily touching the phone
cord tips to the terminals of a flashlight battery. Touching
across one terminal of a 12 volt battery would not harm the phones,
but do not touch the phones across the entire battery. When the
phones are momentarily touched across the small battery, a click in
the headphones indicates that the phones are not defective.
c. First replace the 1U5 tube and check the receiver. Next
replace the three 1T4 tubes, one at a time. Finally, replace the IL6
tube.
d. If the receiver still fails to function, make any repairs
necessary with any test equipment available.
2. The receiver operates, but signals are weak.
a. Check for a weak battery and charge the battery if neces-
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sary. If a dry battery is used, replace with another battery.
b. Check the complete antenna system to insure that no part
of the antenna or lead-in is grounded. Grounded means making an
electrical connection with the earth. Also, check to insure that all
antenna connections are making good electrical contact.
c. Replace the tubes as outlined above.
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Illustration 1 RR-2B Receiver
1. Crystal Oscillator Socket
2. Power ON-OFF and Gain Control
3. Power Plug
4. Beat Oscillator Control
5. Phones Terminals
6. Ungrounded Phone Terminal
7. Tuning Knob
8. Tuning Dial
9. Ground Terminal
10. Antenna Terminal
11. Frequency Range Switch
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Illustration 2 PS-4 Power Converter
1. Antenna (Yellow), Phone (Blue), and Ground (Black) Plug
Connections To Receiver
2. Four-pin Power Socket For Connection To Receiver
3. Power Plug for Direct Connection To Transmitter Or To
Battery Through Power Cable (4)
4. Power Cable For Connection To 12 Volt Battery
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