PS Engineering
PMA8000B-MP3 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-0403
Page 3-5
Rev. 4, Jan. 2011
The outer volume control knob controls intercom volume or the passengers. It has no effect on radio or
music levels.
Adjust the radios and intercom volume for a comfortable listening level. Most general aviation headsets
today have built-in volume controls; therefore, volume also can be further adjusted at the individual hea d-
set.
3.7.2.1
Mono headsets in Stereo Installation
The pilot and copilot positions work with stereo or mono headsets. All passenger headsets are connected
in parallel. Therefore, if a monaural headset is plugged in to a PMA8000B-MP3 Stereo installation, one
channel will be shorted. Although no damage to the unit will occur, all p assengers with mono headsets
will not hear one channel, unless they switch to the “MONO” mode on the headset.
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 sy stem. He will
hear the aircraft radio reception (and sidetone if provided by the radios during transmissions). Copilot will
hear passengers’ intercom and entertainment, while passengers will hear copilot intercom and entertai n-
ment. Neither will hear aircraft radio receptions or pilot tran smissions. The pilot can also listen to Music
#1 if desired. See § 3.8.1 for more information.
A
LL
:
All parties will hear the aircraft radio and intercom. Crew and passengers will hear selected ente r-
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.
3.7.4
Split Mode Intercom
When the PMA8000B enters the Split Mode (pilot on Com 1, copilot on Com 2) the intercom for the crew
is muted. Intercom communication can be restored, if desired, by pressing the Mute button on the audio
panel. The LED indicator in the MUTE button will indicate when the intercom is muted.
3.8 Music Muting (6)
There are two SoftMute™ muting circuits. The front panel "Mute" button has four modes, and controls
the Mute function for music 1.
The SoftMute™ circuit will cut the music out whenever there is conversation on the radio, the intercom,
or both, depending on the “Mute” mode selected. When that conversation stops, the music returns to the
previous level comfortably, over a second or so.
The mute mode functions are controlled through sequential pushes of the Mute button, and include a n-
nunciations of the mode selected.
Mode 1 - music
will
mute with
either
intercom
or
radio - MUTE button is lit. Voice annunciation is "mute
on."
Mode 2 - “Karaoke” mode - music will not mute except during transmissions.- MUTE LED is OFF. An-
nunciation is "mute off."
Mode 3 -
Radio
will mute music, but intercom will
not
mute music - MUTE LED is OFF. Annunciation is
"radio mute."
