Section II. INSTALLATION - TM-11-5820-554-120018

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)

5820-00-566-8373*

Receiver-Transmitter RT-718/FRC-93 (Collins KWM-2)

5820-00-082-4080

Receiver-Transmitter RT-718/FRC-93 (Collins KWM-2A)

*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

1).

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