Table 5-3. Radio Receiver-Transmitter RT-980/GRC-171 Performance Tests (Sheet 9 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

NOISE BLANKER (Cont)

Connect equipment as

AUDIO OUTPUT

Set REMOTE/'LOCAL

shown in figure 5-5.

(A10A2J22-N/S)

switch to LOCAL,

Set rf signal generator

PTT/CARRIER TEST

A for 300.000 MHz,

to PTT, SQUELCH

30% modulation at

switch to OFF, and

400 Hz with rf output

frequency switches to

level of 6 V (3 V

300.000 MHz.

at RT-980/GRC-171

XCVR jack). Set rf

signal generator B

for minimum output.

Using the distortion

10 dB or greater.

analyzer (distortion

function and null 400-

Hz modulation frequency),

measure RT-980/GRC-

171 signal/noise and

record value.

Adjust pulse generator

for a 10-is, 2-V

amplitude, 300-prf

pulse. Adjust rf signal

generator B for 100-

V pulse modulated

output.

Using the distortion

Less than 1.5-dB

analyzer, measure

degradation from

and record RT-980/

value measured in

GRC-171 signal/

step 39.

noise.

With RT-980/GRC-171

Disable RT-980/

At least 4 dB greater

noise blanker disabled,

GRC-171 noise

than value measured

measure RT-980/

blanker by

in step 41.

GRC-171 signal/noise

grounding NOISE

with the distortion

BLANKER DIS-

analyzer.

ABLE (A10A2J22-j).

Repeat steps 40 through

Step 41 will have less

42 using a modulation

than 2-dB degradation

pulse of 10-ps, 2-V

from value measured

amplitude, and 1500

in step 39.

prf.

Step 42 will be at least

4 dB greater than value

measured in step 41.

5-15