CHAPTER 3. RECEIVER-TRANSMITTER RT-718/FRC-93

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

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