Table 5-3. Radio Receiver-Transmitter RT-980/GRC-171 Performance Tests (Sheet 10 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 POWER OUTPUT, REFLECTED POWER, AND FREQUENCY

NOTE

The following steps require the transmitter to be keyed. Transmitter duty cycle is

9 minutes on and 1 minute off.

Connect equipment as

shown in figure 5-6.

Set variable attenua-

tor to 60 dB.

While transmitter is

XCVR

Set frequency

Forward power: 16 to

keyed, reduce variable

(A10W3J2)

switches to 300.000

24 watts. Reflected

attenuator until fre-

MHz and PTT/

power: Not more than

quency counter stabilizes

CARRIER TEST to

forward power divided

(between 20 and 10

CARRIER TEST.

by 4. Frequency:

dB). After observing

Observe watt-

300.000 0.0015 MHz.

forward power, set

meter and fre-

wattmeter for reflected

quency counter.

power and observe

reflected power.

Repeat step 45 for

Forward and reflected

225.000 MHz.

power same as step 45.

Frequency: 225.000

0.001125 MHz.

Repeat step 45 for

Forward and reflected

399.975 MHz.

power same as step 45.

Frequency: 399.975

0.001999 MHz.

Set REMOTE/LOCAL

switch to LOCAL,

PTT/CARRIER TEST

switch to PTT,

POWER switch to

ON.

XCVR

Set 100-MHz digit

Frequency set on fre-

(A10W3J2)

of frequency selec-

quency select switches

tor switches to

+ 1.125 kHz. If error

position 3 And

exceeds 1.125 kHz,

turn each of the

compute actual allow-

remaining switches

able frequency range

through its range.

(selected frequency

Key transmitter at

+ 0.0005%).

each selected fre-

quency and observe

frequency counter.

5-16