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ALTERNATE METHOD
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TM-11-5805-387-10-2 Modem Radio Teletypewriter MD-522A/GRC (NSN
Next
PONY CIRCUIT OPERATION: TRANSMISSION AND RECEPTION
TM 11-5805-387-10-2
Check meter to see that it registers between 0 and 20 mA, depending
on the setting of DC LOOP NO. 1 switch.
Check teletypewriter machine printout. If you cannot read the print
q
out, place modem RECEIVE switch at REV. Check again for a
satisfactory print out.
2-11. DUPLEX OPERATION
TRANSMISSION
Perform the preset procedure
q
for OWR (para 2-8).
Turn ONE WAY/DUPLEX
q
switch to DUPLEX.
Repeat procedures for voice transmission and teletypewriter transmission
q
as described in paragraphs 2-9(b) and (c).
To operate, set AUTO MARK HOLD switch to desired position (ON or
q
OFF).
RECEPTION
2-12. DC LOOP NO. 2 CURRENT CHECK
Turn off audio input to the modem by turning the receiver-
q
transmitter AUDIO GAIN fully counterclockwise.

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