Figure 4-4. Transmitter Power Output and Output Meter Sensitivity Tests, Equipment Setup.

TM 11-5820-509-35

Figure 4-4. Transmitter Power Output and Output Meter Sensitivity Tests, Equipment Setup.

AMPLIFIER TUNE and POWER AMPLIFIER LOAD

c. Procedure.

controls on the front of the receiver-transmitter for

maximum deflection on the XMTR OUTPUT meter.

(1) Set the selector switch on the antenna

Use the OPR-TUNE switch to control power amplifier

simulator to the 2000 kHz position.

plate power. Do not permit the power amplifier to

(2) On

RT-671/PRC-47,

set

the

operate for more than a few seconds in the unloaded or

KILOCYCLES indicator to 2000; place CW-FSK/VOICE

off-resonant condition, serious equipment damage can

switch to VOICE; XMTR PWR switch to LO; and OPR-

result. Between each procedural step of the following

TUNE switch to OAR.

chart, resonate the power amplifier output circuit at the

(3) Place the turns-counters of POWER

new operating frequency.

AMPLIFIER TUNE and POWER AMPLIFIER LOAD

controls to the settings recommended on the LOAD-

TUNE chart on the front of the receiver-transmitter.

CAUTION

Before making the following

measurements, resonate the POWER

Test

Radio

equipment

control

Test

Performance

Step

settings

procedures

standards

a. Set vtvm RANGE switch

a. Place OPR-TUNE switch

a. Read rf voltage across

a. Vtvm reads not less than

to 30 VOLTS.

to TUNE.

dummy load.

13.7 volts rms.

b. n/a

b. Immediately return

b. n/a

OPH-TUNE switch to

OPR.

c. Set vtvm RANGE switch

c. Place XMTR PWR

c. Read rf voltage across

c. Vtvm reads not less than

to 100 VOLTS.

switch to HI; then place

dummy load.

30.7 volts rms.

OPR-TUNE to TUNE.

d. n/a

d. Immediately return

d. n/a

OPR-TUNE switch to

OPR: then place XMTR

PWR switch to LO

4-10