DUPLEX OPERATION

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

out, place modem RECEIVE switch at REV. Check again for a

satisfactory print out.

2-11. DUPLEX OPERATION

TRANSMISSION

Perform the preset procedure

for OWR (para 2-8).

Turn ONE WAY/DUPLEX

switch to DUPLEX.

Repeat procedures for voice transmission and teletypewriter transmission

as described in paragraphs 2-9(b) and (c).

To operate, set AUTO MARK HOLD switch to desired position (ON or

OFF).

RECEPTION

2-12. DC LOOP NO. 2 CURRENT CHECK

Turn off audio input to the modem by turning the receiver-

transmitter AUDIO GAIN fully counterclockwise.

2-20