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CHAPTER 3. RECEIVER-TRANSMITTER RT-718/FRC-93
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TM-11-5820-554-12 Radio Set AN/FRC-93(V)1 AN/FRC-93(V)2 AN/FRC-93(V)3. AN/FRC-93(V)4 AN/FRC-93(V)5 AN/FRC-93(V)6 AN/FRC-93(V)7 Manual
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Figure 3-1. Fixed station (100 watt) interconnections.


TM 11-5820-554 12
Audio frequency response ............ 300 to 2,400 Hz 6-dB
Receiver sensitivity ...................... 0.5 microvolt for 10-dB
signal-plus-noise ratio in
Audio compression
amateur bands.
characteristics ................................ ALC operates on IF band and
Receiver selectivity ...................... 2.1-kHz bandwidth ate dB
RF amplifier stages and is
down, 5-3-kHz bandwidth at
capable of 10-dB
60-dB down.
compression.
Receiver spurious response
Image rejection better than 40dB
Carrier suppression ...................... Carrier 50 dB down from
Interval spurious
output signal
signals below 1 microvolt
Unwanted sideband ...................... 50 dB down from output signal
equivalent antenna input.
Oscillator feed through and/
Automatic gain control ................ Audio output level does not
or mixer products
change more than 20 dB as
(undersized)
50 dB down from output signal (40
the input signal is changed
dB down at 3,500 kHz)
front 10 microvolts to 1 volt.
Second harmonic radiation ........... 40 dB down from output signal.
Fast attack and slow release
Third order distortion .................... 30 dB down from output signal
avc action on voice and cw.
Noise level..................................... 40 dB below single tone carrier
Receiver output level .................... 1.0 watt at agc threshold.
3-5. Items Comprising an Operable Receiver-Transmitter RT-718/FRC-93
Dimensions
Weight
NSN
Item
Qty
Height
Depth
Width
(lb)
Receiver-Transmitter RT-718/FRC-93 (Collins KWM-2)
1
7
14
14
18
Receiver-Transmitter RT-718/FRC-93 (Collins KWM-2A)
1
7
14
14
18
*See paragraph 3-2 note.
Section II. INSTALLATION
for both fixed- and mobile-station use. The Collins
3-6. Unpacking
KWM-2/2A is set up for a high-impedance phone
Carefully lift the transceiver out of the packing
patch input (at PHONE PATCH input J11) such as
material.  Examine for visible damage.  If the
the phone patch supplied in Control, Radio Set C-
transceiver has been damaged in shipment, follow the
6118/FRC-93 or C-7515/FRC-93. A low-impedance
procedures outlined in paragraph 1-3. Check to see
phone patch, (Collins 189A-2), may be used by
that all tubes and crystals are seated properly in their
making the following change in the Collins KWM-
sockets.  Check tuning controls and switches for
2/2A. Disconnect the two brown-white wires from pin
freedom of action.
F on terminal board E60.  Use an ohmmeter to
3-7. Mounting and Cabling
determine which of the two wires is connected to
For 100-watt, fixed-station installation, refer to figure
PHONE PATCH jack J11. Connect this wire to pin 7
3-1.  For mobile installation, refer to figure 3-3.
of V1. Resolder the other brown-white wire as
Traveling 1,000-watt station interconnections are
originally connected.
shown in figure 3-2.
b. Mobile Installation. Select a location in the car to
CAUTION
install the transceiver. Allow clearance on all sides to
The Collins KWM-2/2A must be operated
assure adequate ventilation.  If VOX operation is
into a 50-ohm load with a vswr not
desired, leave enough space above the transceiver to
exceeding 2.0-1.  Random length wire
open the top cover for adjustment of VOX and
antennas or light bulb dummy loads
ANTIVOX GAIN controls, S-meter zero, etc. If the
cannot be used. Conventional half-wave
Collins 351D-2 is to be used, drill holes and fasten the
dipoles and beam antennas may be used
adapter bracket to the transmission hump with self-
at, or very near their resonate frequency.
tapping screws.  Attach the mount to the bracket.
Exceeding a vswr of 2.0-1 can destroy the
Swing the cantilever supports forward. Install the side
components in the output stage of this
slides in the Collins KWM-2/2A according to the
transceiver.
Collins 351D-2 installation instructions. Remove the
a. Fixed-Station Installation. Connect associated
plastic dust covers from the (Collins 351D-2) plugs,
equipment to the Collins KWM-2 or KWM-2A (fig.3-
and store them in the recesses of the mount. Slide the
ANT SW connector J25 supplies band
transceiver onto the mount and push back until
information in the form of grounds for each 3.5-, 7-,
14-, 21-, and 28-MHz operating band. This system
provides a convenient method of providing band
information to automatically tuned antenna systems
Change 3 3-2


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