Figure 3-112. Balanced Modulator Adjustments, Test Equipment Setup

TM 11-5820-509-35

Figure 3-112. Balanced Modulator Adjustments, Test Equipment Setup

(4) Observe the transmitter carrier output on

b. Adjustment Procedures.

the oscilloscope and adjust A2R5 and A2C35 (fig. 3-95)

alternately until the minimum carrier output is obtained.

(1) Connect the rf probe of the multimeter to

{5) Return the POWER-LIGHTS switch to

POWER OFF and disconnect the test equipment.

(2) Place the OPR-TUNE switch to TUNE

(6) Return the RT-671/PRC-47 to its case

and adjust the slug on the top of transformer A2T2 (fig.

using the procedures of paragraph 3-11 if no further

3-20) for maximum indication on the multimeter.

adjustments are required.

(3) Return the OPR-TUNE switch to OPR;

place the CW-FSK/VOICE switch to CW-FSK.

3-131