Specifications

PS Engineering
PMA8000B Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-0100 Page 3-5 Revision 8, May 2008
3.7.3 Intercom Modes (8)
The “ICS” pushbutton switch on the left side of the panel provides the selection of the three intercom
modes. The description of the intercom mode function is valid only when the unit is not in the "Split"
mode. Then, the pilot and copilot intercom is controlled with the Mute button.
This button cycles through the intercom modes, from top to bottom, then bottom to top as: ISO, ALL Crew
and Crew, ALL, ISO. An LED shows which mode is currently active.
I
SO: The pilot is isolated from the intercom and is connected only to the aircraft radio system. He will hear
the aircraft radio reception (and sidetone during radio transmissions). Copilot will hear passengers’ inter-
com and entertainment, while passengers will hear copilot intercom and entertainment. Neither will hear
aircraft radio receptions or pilot transmissions.
A
LL: All parties will hear the aircraft radio and intercom. Crew and passengers will hear selected enter-
tainment. During any radio or intercom communications, the music volume automatically decreases. The
music volume increases gradually back to the original level after communications have been completed.
C
REW: Pilot and copilot are connected on one intercom channel and have exclusive access to the aircraft
radios. They may also listen to Entertainment 1. Passengers can continue to communicate with themselves
without interrupting the Crew and may listen to entertainment as configured.
3.8 Music Muting
There are two SoftMute™ muting circuits. The SoftMute™ circuit will cut the music almost completely
out whenever there is conversation on the radio or intercom. When that conversation stops, the music re-
turns to the previous level comfortably, over a second or so.
The pilot and copilot have one muting circuit, which is controlled by the front panel button labeled “Mute.”
When this button is pressed, the PMA8000B will be put into a Karaoke mode. The music will not be
muted, ever.
The passenger’s intercom also has a SoftMute™ circuit. It behaves the same way as the crew, such that if
the passengers will hear the radio, or talk on the intercom, the music will mute. If the audio panel is in
CREW mode, then the radio reception will not affect the passenger music.
There is a Karaoke Mode that is activated either by an external switch installed either in the panel or near
where the passengers can reach it, or connected to the AUX button on the PMA8000B.
3.9 Telephone Mode (9)
The TEL mode serves as a full duplex interface for telephone systems such as AirCell or portable cellular
phones with earpiece jacks. When interfaced with an approved airborne telecommunications system, the
PMA8000B can serve as a audio control and distribution center. When TEL is active, the button will blink
about twice as fast as the normal transmit rate.
In ALL intercom mode, all crew and passengers will be heard on the phone when they speak. All will hear
selected audio. Com audio is automatically heard in the headsets.
In CREW mode, the pilot and copilot are connected to the telephone. The pilot and copilot will have
transmit capability on the other selected transceiver Com 1 or 2, simply by using their respective PTT
switch.
In ISO intercom mode, when the PMA8000B is in the TEL mode, the pilot position is in the "Phone
Booth." Only the pilot will hear the telephone, and only he will be heard. He will also have access to Com
1 or 2, and will transmit on that radio using the PTT. All selected audio is provided.