BFO FREQUENCY LIMITS ADJUSTMENT

TM 11-5805-387-34-2

2-16.

BFO FREQUENCY LIMITS ADJUSTMENT

Test Equipment

Electronic Digital Readout Counter ANIUSM-207

Test Connections

Make sure that the front panel BFO control is in the center of its range.

Remove dust cover from receive audio module Al.

Connect electronic counter to RCVR MIXER INJ test point.

PROCEDURE

INDICATION

1. Set ON/OFF switch to ON and allow a

15-minute warmup.

2. Adjust BFO FREQ LIMIT ADJ potentiometer

Counter reads 4,805 Hz + 5

A1A2R7.

3. Rotate front panel BFO control fully

Counter reading Is no higher

Go to 4, then

counterclockwise.

than 3,805 Hz. This Is the

to 5

lower frequency limit.

4. Rotate front panel BFO control fully

Counter reading is at least

Go to 5

clockwise.

5,805 Hz. This Is the upper

frequency limit.

5. Readjust BFO FREQ LIMIT ADJ until

tolerances in steps 3 and 4 are met.

6. Set ON/OFF switch to OFF. Disconnect test

setup.

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