Air Comm Systems Six Passenger ICS/Transmit Expansion Unit ACS 179A - Manual (Page 6)

Air Comm Systems, Inc. Page 6
ACS 179A Installation and Operations Manual
Operations of the ACS 179A
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Description
The ACS 179A is a compact, remote slave unit which provides intercom and receive capability
for up to six (6) aircraft passengers. Additionally, two (2) have transmit capability if desired.
Dip switch programmable.
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Method of Operation
The ACS 179A is slaved to a master Audio Mixer Panel for receiving and transmitting. The
master Audio Mixer is normally a co-pilot or rear-crew member unit. The audio inputs selected
by the master panel will be heard by the ACS 179A.
The ACS 179A’s transmit and intercom functions are activated using a switch and cord
assembly (such as the Carter Engineering or Comm Innovations models). The switch cord
assembly also provides a volume control for the adjustment of both the intercom and receive
audio. This allows for the independent control of volumes between the passengers and the
Audio Mixer they are slaved to.
Transmitting from the ACS 179A is a two-step process:
1) the desired radio must be selected on the master Audio Mixer’s mic selector.
2) the switch cord must be placed in the transmit position.
NOTE: When either passenger transmits, the master Audio Mixer’s microphone is
automatically disconnected. This feature prevents the possibility of there being two
microphones activated simultaneously during the transmit function.
During intercom or transmit operation , the receive audio is muted on the ACS 179A. During
Hot ICS operation the receive audio is unmuted ( each passenger has a separate Hot ICS
switch ).
NOTE: For USFS operation a jumper can be cut on each passenger PC board to disable this
muting function.
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Adjustments
The volume control on the switch cord assembly adjusts both the intercom and the receive
audio. It should be set at a comfortable level on intercom first. Then, if the receive audio
volume is too high or low, it can be adjusted at the radio itself ( i.e. Com, FM, Nav, etc. )
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Unit Compatibility
The ACS 179A is compatible with all Air Comm Audio Mixer Panels.