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LOOP CURRENT ADJUSTMENT (cont)
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TM-11-5805-387-34-2 Modem Radion Teletypewriter MD-522A/RC (NSN
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SCOPE MODULE A2 CENTERING 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
NO
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.
2-37

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