Figure 4-6. Transmitter Power Input Test, Equipment Setup.

TM 11-5820-509-35

Figure 4-6. Transmitter Power Input Test, Equipment Setup.

c. Procedure.

CAUTION

Before

making

the

following

(1) Set the selector switch on the antenna

measurements, resonate the POWER

simulator to the 2000 kHz position.

AMPLIFIER TUNE and POWER

(2) On

671/PRC

47,

set

the

AMPLIFIER LOAD controls on the

KILOCYCLES indicator to 2000; set CW-FSK/VOICE

front of the receiver-transmitter for

switch to VOICE, the XMTR PWR switch to LO, and the

maximum deflection of the XMTR

OPR-TUNE switch to OAR.

OUTPUT meter. Use the OPR-TUNE

(3) Place the turns-counters of POWER

switch to control power amplifier

AMPLIFIER TUNE and POWER AMPLIFIER LOAD

plate power.

Do not permit the

controls to the settings recommended on the LOAD-

TUNE chart on the front of the receiver-transmitter.

power amplifier to operate for more

than a few seconds in the unloaded

or off-resonant condition, serious

equipment damage can result.

Test

Radio

equipment

control

Test

Performance

Step

settings

procedures

standards

n/a

Place XMTR PWR switch

Return OPR-TUNE switch

Dc ammeter reads not more

to HI and resonate power

to OPR and close handset

than 12.5 amperes.

amplifier output circuit to

push-to-talk

switch.

Maximum output with

Speak normally into the

OPR-TUNE switch in

microphone. Observe dc

TUNE position.

ammeter reading.

4-16