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Radio Set AN/FRC-93(V)7, Mobile 100-Watt 28-Volt Dc Configuration.
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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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Section II. INSTALLATION - TM-11-5820-554-120018


TM 11-5820-554-12
CHAPTER 3
RECEIVER-TRANSMITTER RT-718/FRC-93
Section I. INTRODUCTION
3-1. General
respectively from it's primary power supply. Any
This chapter describes Receiver-Transmitter RT-
high-impedance crystal or dynamic microphone may
718/FRC-93 (Collins KWM-2 and KWM-2A), to be
be used. A 4-ohm speaker is required.
referred to as the transceiver. This chapter covers
NOTE
installation, operation, and operator's and organi-
Any commercial or military 4-ohm
zational maintenance.
voice coil impedance speaker may be
3-2. Description
used with the equipment. The speaker
voice  coil  should  be  capable  of
NOTE
withstanding peak power of 5 watts for
The  Model  KWM-2A  will  be
best service.
supplied for all new procurements;
The antenna and feed system must present a 50-ohm
however, a resupply from Depot
load with answer not exceeding 2.0 to 1 looking into
stocks may include either model.
the RF OUTPUT jack.
The Collins KWM-2, and KWM-2A transceivers are
3-4. Tabulated Data
capable of covering any frequency within the ranges
Frequency range ............................ 3.4 to 5.0 and 6.5 to 30 mhz.
of 3.4 to 5.0 MHz and 6.5 to 30 MHz, with the
Mode.............................................. Single sideband (either sideband
....................................................... selectable) or cw.
crystals furnished. The Collins KWM-2 is equipped
Type of service .............................. Ssb-- continuous;cw-- 50%
with 14 crystal sockets which are selectable from the
duty cycle.
front panel and provide 14 operating bands, each 200-
Power consumption from
a.c. line .......................................... 190 watts in receive function.
kHz wide. The Collins KWM-2A differs only in the
430 watts peak in lock-key.
number of crystal sockets furnished, the method of
290 watts in voice transmit.
Plate power input .... ..................... 157 watts pep (nominal) into
switching  crystals,  and  slight  electrical  and
50-ohms on 80-, 40-, and 20
mechanical differences related to crystal switching. It
meter bands.
90 watts pep (nominal) into 50 ohms, on
is equipped with an extra crystal-mounting board
15-meter band.
which doubles the number of selectable crystal
80 watts pep (nominal) into 50 ohms, on
10-meter band.
sockets. Crystals for added coverage may be plugged
Audio input ................................... High-impedance microphone or phone
into spare sockets in either transceiver.
....................................................... patch
RF output impedance .................... 50 ohms with not more than 2.0
3-3. Requirements for Operation
to 1 swr.
RF input impedance ...................... 50 ohms.
Either transceiver requires a 110-volt, 50- to 60-
RF feedback
Approximately 10 db of RF
Hertz, ac power source and a power supply, such as
feedback around pa and driver.
Matching speaker
the PP-3990/FRC-93 or PP-4151/FRC-93, for fixed
impedance ..................................... 4 ohms.
station operation.  It consumes approximately 190
Matching phone jack
impedance ..................................... 500 to 1,000 ohms, receive
watts of power from the line in receive function and
output to phone patch;
approximately 430 watts in transmit function. The
high-impedance phone jack
input to transmitter.
transceiver may be operated as a mobile station by
Calibrator ...................................... 100-hertz crystal oscillator.
using a Collins MP-1 for 12-volt dc operation or a
Frequency stability
Within 100 hertz during any 1-hour
PP-4765/GRC-159(V) for 24- to 28-volt dc operation.
period following 20-minute warm-up.
Not more than 100 Hz with
In mobile operation, the transceiver requires 800 volts
10% line voltage variation.
dc at approximately 175 ma; 275 volts dc at
Calibration accuracy ..................... 1 kHz after midband calibration.
Backlash ........................................ Not more than 50 hertz.
approximately 210 ma, a bias supply adjustable
Keying ........................................... Break-in cw with sidetone
between -60 and -80 volts; and 6-, 12-, or 24-volt dc
provided.
filament supply at 11.0, 5.5, or 2.75 amperes,
3-1
Change 3


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