THE RT-49 IS A MINIATURE TRANSMITTER AND WILL DELIVER OVER ITS FREQUENCY RANGE AN AVERAGE POWER OF 15 WATTS INTO RANDOM LENGTH ANTENNAS.

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03330A000700020001-7
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 9
• 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-RDP78-03330A000700020001-7
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NOTE
1. Normal hand-key cable connections are as follows:
Pins A&B: Jumpered at plug.
Pins D&F: Connected to hand-key.
2. The special cable referred to in paragraph E. 5 is
wired as follows:
Pins A&B: Connected to hand-key.
Pins D&F: Jumpered at plug.
This permits the transmitter antenna relay to operate thereby
allowing break-in operation. However, serious consideration
should be given to the amount of audible noise generated by
this relay and its possible effect.
3. Delete this page prior to issuing the document.
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RT-49
TRANSMITTER
OPERATING INSTRUCTIONS
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A. INTRODUCTION
The RT-49 is a miniature transmitter and will deliver over its
frequency range an average power of 15 watts into random length
antennas. It's- output frequency may be determined by a crystal,
crystal matrix, or frequency synthesizer. It covers a frequency
range of 3 to 24 megacycles and may be keyed at speeds up to 1200
words per minute. It requires a 42 volt DC supply at approximately
1.5 amperes. If an automatic keyer, crystal matrix, or frequency
synthesizer is used, a 12 volt DC supply at approximately 0.5
amperes will also be required.
B. DESCRIPTION OF CONTROLS AND SW ITCHES
1. KEY Button (2)
The Key button is used to key the transmitter during the
tuning process. It will not operate when a plug is in-
serted in the keyer socket (3) which shorts pins A&B.
This occurs with most external keying devices.
2. DRIVE TUNE Control (8)
The Drive Tune control is used to tune the radio frequency
input stages of the transmitter. This control turns the
Drive Tune dial (7) and is adjusted to give maximum light.
from the DR indicator lamp (9).
3. PA TUNE Control (II)
The PA Tune control is used to tune the radio frequency
output stages of the transmitter. This control turns the
PA Tune dial (15) and is adjusted to give maximum light
from the PA indicator lamp (10).
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4. ANT. LOAD Control (13)
The Antenna Load control is used to tune the radio frequency
output stages of the transmitter.to the antenna. This
control turns the Ant. Load dial (14) and is adjusted to
give maximum light from the Ant. Load indicator lamp (12).
5. Band Switch (16)
The Band switch is used to select one of the transmitter's
three radio frequency output ranges.
C. PREPARATION FOR USE
1. With the transmitter's power supply turned off, connect
the power supply to the transmitter's power supply socket (4).
2. Latch the power supply and the transmitter together with the
slide latch (1).
3. Connect the transmit antenna by depressing the XMTR ANT.
connector post (17), inserting the wire in the connector and
releasing the connector. If the antenna being used has two
lead wires, connect the second wire to the GRD connector
post (17) in the same manner in which the first wire was
con n ect ed.
4. If no wire has been connected to the GRD connector post (17)
in step 3 above, connect an earth ground to this connector.
5 If a common transmit/receive antenna is desired, connect an
insulated wire between the receiver's antenna connector and
the REC ANT. connector post (17). If a common transmitter/-
receiver power source is also desired, delete this step and
refer to the appropriate power supply operating instructions.
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6. Insert the proper frequency determining source into it's
appropriate socket. If a crystal is being used, it should be
plugged into the XTAL socket (6). If a crystal matrix or
frequency synthesizer is being used, it's connecting cable
should be plugged into the VFO socket (5). NOTE: If the
desired output frequency is between 3 and 12 megacycles,
the frequency determining source should be the same as
the output frequency. If the desired output frequency is
between 12 and 24 megacycles, the frequency determining
source should be one-half the output frequency.
7. Turn the band switch (16) to the frequency range, in mega-
cycles, that includes the desired output frequency.
8. Adjust the DRIVE TUNE (8) and PA TUNE (11) controls until
the desired output frequency, in megacycles, appears
beneath the red hair-line of their respective dials (7&15).
9. Adjust the ANT. LOAD control (13) until zero appears beneath
the red hair-line of the ANT. LOAD dial (14).
D. TRANSMITTER TUNING
1. Ensure that the transmitting antenna is connected to the
XMTR ANT. connector post (17).
2. Turn on the transmitter power. (Refer to the appropriate
power supply operating instructions.)
3. Depress the KEY button (2) and adjust the DRIVE TUNE control
(8) for maximum light from the DR indicator lamp NJ.
4. Depress the KEY button (2) and adjust the PA TUNE control
(11) for maximum light from the PA indicator lamp (10).
5. Depress the KEY button (2) and adjust the ANT. LOAD control
(13) for maximum light from the ANT. LOAD indicator lamp (12).
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6. Depress the KEY button (2) and readjust the PA TUNE (11)
and ANT. LOAD (13) controls for maximum light from the
ANT. LOAD indicator lamp (12).
NOTE: Adjustments made to either the PA TUNE (11) or
ANT. LOAD (13) controls affect the other so the last adjust-
ment should always be made with the PA TUNE control (11).
7. Depress the KEY button (2) and readjust the DRIVE TUNE
control (8) for maximum light from the DR indicator lamp
(9).
8. Check the dial readings of the DRIVE TUNE (7) and PA TUNE
(15) dial. These readings should still approximate the
desired output frequency in megacycles. Any large variance
is indicative of mistuning and requires that steps 3 through
7 be repeated.
9. Turn off the transmitter power. (Refer to the appropriate
power supply operating instructions. )
E. TRANSMITTER OPERATION
1. After completion of the steps in paragraph D above, the
transmitter is ready for operation as soon as the transmitter
power is turned back on. It may be keyed manually by means
of the KEY button (2) if required.
2. Normally, the transmitter will be keyed by an external keying
device connected to the keyer socket (3). Transmitter power
should be turned off whenever inserting or removing the
keying connector from the KEYER socket (3).
?
3. The transmitter power should be turned off between transmissons.
This statement is stressed for the following reasons:
a. The power supply battery's life is conserved.
b. When a common transmit/receive antenna is
used, removal of transmitter power allows
the antenna to be switched from the transmitter
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to the receiver.
c. When a frequency determining device is connected
to either the VFO (5) or XTAL (6) socket, strong
radio frequency signals will be emitted as long
as the transmitter power is on. This might
hinder or prevent reception of desired distant
signals.
4. Simultaneous transmission and reception of manual CW
(break-in operation) is not recommended when:
a. Transmit and receive frequencies are identical
and separate transmit and receive antennas are
used.
b. Transmit and receive frequencies are different
and a common transmit/receive antenna is used.
In this instance, break-in operation may be
used, if the situation warrants, by unplugging
the external keying device from the KEYER socket
(3) and keying with the KEY button (2).
5. If break-in operation as described in paragraph 4. b is
normally required, a special keying cable will be pro-
vided.
F. MAINTENANCE
Due to the miniaturized construction of the transmitter, no
maintenance should be attempted. The transmitter should be re-
turned to base for exchange.
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1. Slide Latch
2. KEY
3. KEYER Socket
4. Power Supply Socket
5. VFO Socket
6. XTAL Socket
7. DR I VE TUNE Dial
8. DRIVE TUNE Control
9. DR Indicator Lamp
? 10. PA Indicator Lamp
11. PA TUNE Control
12. ANT. LOAD Indicator Lamp
13. ANT. LOAD Control
14. ANT. WAD Dial
15. PA TUNE Dial
16. Band Switch
17. XMTR ANT., GRD, REC ANT.
Connector Posts
Declassified in Part - Sanitized Copy Approved for Release 2014/05/29: CIA-RDP78-03330A000700020001-7