Table 5-3. Radio Receiver-Transmitter RT-980/GRC-171 Performance Tests (Sheet 8 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

IF OUTPUT

Connect equipment as

IF output

Set REMOTE/LOCAL

5 to 15 mV.

shown in figure 5-3.

(A10A2J8)

switch to LOCAL,

Set rf signal generator

PTT/CARRIER TEST

for rf output level of

switch to PTT,

6 V at 300.000 MHz.

SQUELCH switch to

OFF, and frequency

switches to 300.000

MHz. Measure the

IF output voltage.

RECEIVER IMAGE RESPONSE

Connect equipment as

IF AGC

Set REMOTE/LOCAL

This measurement will

shown in figure 5-4.

(A10A1TP12)

switch to LOCAL,

be a reference for

Set rf signal generator

PTT/CARRIER TEST

measurements taken

for rf output level of

switch to PTT,

in step 37.

6 V at 399.975 MHz.

SQUELCH switch to

OFF, and frequency

switches to 399.975

MHz. Measure and

note IF AGC

(A10A1TP12)

voltage.

Adjust rf signal generator

Same as step 36.

More positive than

for 339.975 MHz with

Observe and com-

reference voltage.

60,000-V rf output.

pare the IF AGC

voltage with ref-

erence voltage

determined in

step 36.

NOISE BLANKER

NOTE

The oscilloscope can be used as an aid in setting up the pulse generator pulse width

and pulse recurrence frequency. Noise blanker operation can be observed with the

oscilloscope connected to the RT-980/GRC-171 AUDIO OUTPUT (A10A2J22-N/S).

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