Table 5-3. Radio Receiver-Transmitter RT-980/GRC-171 Performance Tests (Sheet 4 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)

RELAY NC and

(Cont)

SQUELCH RELAY

COM (A10A2J22-Z/a).

Set vom for continuity

check.

Observe distortion analy-

AUDIO OUTPUT

AUDIO OUTPUT: 7.25

zer and vom.

(A10A2J22, pins

to 9.0 V rms.

N and S),

SQUELCH RELAY

COM to NC continuity:

Not less than 100 kΩ.

NC (A10A2J22-Z)

and SQUELCH

RELAY COM

(A10A2J22-a)

Increase modulation to

Measure audio

AUDIO OUTPUT

90%. Observe distor-

output increase

increase: Not more

tion analyzer and vom.

in dB from that

than 3 dB. SQUELCH

measured in step

RELAY COM to NC

18.

continuity: Not less

than 100 kΩ.

Reduce signal level to 25

Observe squelch

AUDIO OUTPUT volt-

V. Observe distortion

gate closes and

age: Not more than

analyzer and vom.

note audio output

0.1 V rms. SQUELCH

voltage.

RELAY COM to NC

continuity: Not more

than 1Ω.

Observe distortion

Set SQUELCH

AUDIO OUTPUT volt-

analyzer and vom.

switch to OFF.

age and SQUELCH

RELAY COM to NC

continuity returns to

levels measured in

step 19.

Repeat step 20

Same as step 20.

with REMOTE/

LOCAL switch

set to REMOTE

and C-7999/

GRC-171 fre-

quency switches

set to 300.000

MHz and

SQUELCH

switch set to

ON.

5-10