Table 5-3. Radio Receiver-Transmitter RT-980/GRC-171 Performance Tests (Sheet 13 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 EQUIPMENT

STANDARD

TRANSMITTER KEYING

NOTE

Squelch relay, A9K1, is a mercury-wetted contact type relay. For the squelch relay to

function properly, the RT-980/GRC-171 must be in its normal operating position.

Connect rf load to

TEST meter

Set RT-980/GRC-171

RT-980/GRC-171

(A10A1M1)

switches as follows:

antenna connector

(J9 rear panel).

REMOTE/LOCAL to

Connect C-7999/

REMOTE, PTT/

GRC-171 to RT-

CARRIER TEST to

980/GRC-171.

PTT, SQUELCH to

OFF, TEST meter

selector to FWD

PWR, and POWER

to ON.

Set C-7999/GRC-171

switches as follows:

PWR to ON, SQLCH

to OFF.

NOTE

Inspect audio module A4 and keyer module A9 to determine strapping options used.

Perform applicable sections of steps 62, 63, and 66.

TEST meter

a. Key transmitter

a. Power indication

(A10A1M1)

by grounding the

TEST meter.

center tap of the

AUDIO INPUT

(A10A2J22-D/E)

thru a 3300-ohm

resistor. Ob-

serve the trans-

mitter is keyed.

b. Adjust power supply

b. Observe the

b. Power indication on

for 6-V dc output and

transmitter is

TEST meter.

connect the power sup-

keyed.

ply voltage output to

RT-980/GRC-171

connector A10A2J22-

(Cont)

D/E.

5-19