Power Switch (1) (Emg-Fail Safe Operation) - PS Engineering PMA8000C Operation Manual

This pilots guide provides operating instructions for the PMA8000C Audio
Panel. Please read it carefully before using the equipment so that you can
take full advantage of its capabilities.
This guide is divided into operating sections such as Transceiver Selection,
Audio Selector, Intercom, and Marker Beacon Receiver, and special func-
tions. The center section provides a handy reference that you can remove.

Power Switch (1) (EMG-Fail Safe Operation)

The power switch controls all audio selector panel functions, intercom and
marker beacon receiver.
When the unit is turned off, either by pressing the volume control, or if the
breaker is pulled removing power, the PMA8000C is in Fail-Safe mode. In
this mode, the pilot's headset is connected to COM 1 for transmit and re-
ceive, and connected to unswitched input #1 for priority audio alerts. The fail
safe com audio is heard only in the left ear , while the unswitched audio is
heard only in the right ear of a stereo headset.
Receiver selection
Transmitter selection
Communications Receive (RCV) Selection (3)
To listen to the other radio, press the upper button, in the RCV (receive) sec-
tion. When a com is selected for receive, it will stay selected until manually
Page 2
PMA8000C controls
Communications Transmit (XMT)
Selection (2)
To select COM 1 COM 2 or COM 3 for
transmit, press the button on the bottom row,
next to the XMT legend. The bottom and top
button indicators light, showing that you will
transmit and receive on the selected radio.
202-890-0303 Rev. 3 PMA8000C Pilot Guide