Table 5-3. Radio Receiver-Transmitter RT-980/GRC-171 Performance Tests (Sheet 14 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 (Cont)

c. Adjust power supply

c. Observe the

c. Power indication on

(Cont)

for 26-V dc output and

transmitter is

TEST meter.

connect the power sup-

keyed.

ply voltage output to

RT-980/GRC-171

connector

A10A2J22-D/E.

d. Adjust power supply

d. Observe the

d. Power indication on

for 48-V dc output

transmitter is

TEST meter.

and connect the

keyed.

power supply volt-

age output to

RT-980/GRC-171

connector

A10A2J22-D/E.

a. Remove 3300-ohm

resistor from

AUDIO INPUT

center tap

(A10A2J22-D/E).

b. Disconnect power sup-

ply from RT-980/

GRC-171.

c. Disconnect power sup-

ply from RT-980/

GRC-171.

d. Disconnect power sup-

ply from RT-980/

GRC-171

TEST meter

Key transmitter by

Power indication on

(A10A1M1)

grounding the

TEST meter.

REMOTE PTT

(A10A2J22-J).

Observe the

transmitter is

keyed.

TEST meter

Set RT-980/GRC-171

Power indication on

(A10A1M1)

REMOTE/LOCAL

TEST meter.

switch to LOCAL.

Key transmitter by

grounding DYNAMIC

MIC PTT line

(A10A1J4-E).

5-20