Table 5-3. Radio Receiver-Transmitter RT-980/GRC-171 Performance Tests (Sheet 5 of 17)

TO 31R2-2GRC171-2

TM 11-5820-815-14

NAVELEX 0967-LP-544-5010

CONTROL SETTINGS

OPERATION OF TEST

AND OPERATION

PERFORMANCE

STEP

EQUIPMENT

POINT OF TEST

OF EQIPMENT

STANDARD

RECEIVER SQUELCH (Cont)

Set rf signal generator for

Set REMOTE/LOCAL

7.25 to 9.0 V rms.

rf input level of 3 V at

switch to LOCAL and

300.00 MHz, 30%

SQUELCH switch to

modulation at 1 kHz.

ON. Adjust

SQUELCH level

control counter-

clockwise until

audio output signal

is just obtained.

Observe the audio

output voltage.

Remove rf signal

Not more than 0.03

input. Observe

V rms.

that squelch gate

closes and note

audio output

voltage.

RECEIVER HEADSET AUDIO

With the equipment set up

HEADSET

Adjust VOL con-

7.75 V rms.

as in step 17, connect

OUTPUT

trol to obtain

600-ohm load and dis-

(A10A1J3)

output level of

tortion analyzer to

100 mW (7.75

RT-980/GRC-171

V rms).

HEADSET OUTPUT

(A10A1J3).

RECEIVER NARROW-BAND AUDIO RESPONSE

Connect equipment as

AUDIO OUTPUT

Set REMOTE/LOCAL

shown in figure 5-2. Set

(A10A2J22-N/S)

switch to LOCAL,

rf signal generator for

PTT/CARRIER TEST

rf input level of 500 V

switch to PTT,

at 300.000 MHz, 30%

SQUELCH switch to

modulation at 100 Hz

OFF, and frequency

to 10 kHz.

switches to 300.000

MHz.

Set rf signal generator for

Observe and note

This measurement will

1000-Hz modulation

the audio output

be a reference for

signal.

level.

measurements taken in

step 28.

5-11