ONE-WAY REVERSIBLE (OWR) OPERATION

TM 11-5805-387-10-2

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

transmitter AUDIO GAIN fully counterclockwise.

Check meter for direct current (20 or 60 mA)

flowing through DC LOOP NO. 1

To maintain loop current flow

set AUTO MARK HOLD switch

to ON position.

NOTE

Meter will register in the right scale (upscale) when

loop battery module INTERNAL-EXTERNAL switch

is in INTERNAL position. Meter will read in the left

scale (downscale) when in EXTERNAL position.

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