4.
AUXILIARY EQUIPMENT.
Auxiliary equipment and accessories are:
KY-65 voice communications security equipment.
KG-84 for secure data transmission.
Teletypewriter set AN/UGC-74A(4).
Radio set control group AN/GRA-39B (modified).
Antenna AS-2259 (NVIS).
Antenna AN/GRA-50 (doublet).
Deployable tactical antenna siting kit RF-4032.
Intercom set AN/VIC-1.
Adapter MX-9913/GR used with the AS-2259.
Headset H-140, leg key KY-872, and handset H-250 or H-189.
5. COMPONENTS AND THEIR CONTROLS.
Now that you know the major
components, technical characteristics, auxiliary equipment, and
accessories of the radio set AN/GRC-193, you will learn the major
components and their controls in detail.
a. The receiver-transmitter RT-1209 is a miniaturized HF-SSB
transceiver that provides control of frequency, mode selection,
switching, and tuning of the radio set. The receiver-transmitter can
be operated in the USB or LSB mode and the voice or data modes at any
frequency from 2 to 29,999.9 MHz in increments of 100 Hz.
Audio
connections are provided for a handset, headset, CW key, or data
inputs. The transmitter generates an SSB carrier, either USB or LSB,
of 250 megawatts (MW).
Received signals are converted and
demodulated in the receiver-transmitter to audio signals and are sent
to the headset, speaker, or frequency-shift keying (FSK) converter
and then to the teletype for printing.
The transmitter provides
frequency control and transmit/receive control switching signals to
the power amplifier and coupler. It is supplied with 26.5 V DC power
by way of the power amplifier and amplifier-converter. The receiver-
transmitter RT-1209 and amplifier converter AM-6879 are installed
together on a single mount in the vehicle mounting rack.
All
controls, indicators, and connections are on the front panel (Fig 2).
3
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