Power Input Requirements, Receive Mode

TM 11-5820-509-35

Figure 4-2. Receiver Audio Output Distortion Test, Equipment Setup.

c. Procedure.

Test

Radio

equipment

control

Test

Performance

Step

settings

procedures

standards

Adjust signal generator to

Adjust frequency control

Set VOLUME control to

Audio output distortion less

2225.3 kHz: set output

knobs to 2225 on

obtain 12.9 volts across

than 15%.

level to 1000 microvolts

KILOCYCLES indicator:

the 300-ohm audio load

CW-FSK/VOICE to

(500 milliwatts); read

VOICE: OPR-TUNE to distortion.

OPR.

4-13. Power Input Requirements, Receive Mode

(fig 4-3)

(1) Connect the test equipment to Radio

Receiver-Transmitter RT-671/PRC-47 as shown in

a. Test Equipment and Material.

figure 4-3.

(2) Connect the primary power source to the

(1) Signal Generator SG-103/URM-25F

receiver-transmitter.

(2) Frequency Counter AN /URM 79/U

(3) Turn on the test equipment and place the

POWER-LIGHTS switch on RT-671/PRC-47 to POWER

(3) Dc ammeter, 0 to 1 ampere. Simpson

ON. Permit the equipment to stabilize at least 5

375, or equal.

minutes before beginning the procedures shown in the

(4) Audio load, 300-ohm, I watt composition

chart below.

resistor.

b. Test Conditions and Equipment Connections.

(5) Primary power source: 26.5 volt, dc. 11

amperes approx .

4-8