PS Engineering PMA6000B - Manual (Page 19)

PS Engineering
PMA6000B Audio Selector Panel and Intercom System
Installation Manual
200-066-0200 Page 3-4 Rev 6, Feb. 2013
meet the situation. The description of the intercom mode function is valid only when the unit is either in
the C
OM 1 or C OM 2 modes. When the unit is in the "Split" mode, only the passengers have intercom
function.
Pushing the ICS button cycles the intercom through the three intercom modes.
I SO : (Top indicator): The pilot is isolated from the intercom and is
connected only to the aircraft radio. He will hear the aircraft radio
reception (and sidetone during radio transmissions). Copilot and
passengers will hear the intercom and music on Entertainment 1, but
not the aircraft radio receptions or pilot transmissions.
A LL : (Middle indicator): All parties will hear the aircraft radio,
intercom, and music from Entertainment input #1. However, during any intercom communications, the
music volume automatically decreases when SoftMute™ is active. The music volume increases gradually
back to the original level after communications have been completed.
C REW (Lower indicator): 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 commu-
nicate with themselves without interrupting the Crew and also may listen to Entertainment 2. Anytime the
PMA6000B is in "Split Mode" the pilot and copilot do not have any intercom function. The passengers
will maintain intercommunications.
3.7.3 Entertainment Input
The audio selector panel has provisions for up to two separate entertainment input devices. Which device
is heard is determined by the intercom mode switch located in the center of the intercom section of the
audio panel. (See Table 1 for overview.)
While in the ISO (Isolate) mode, only the copilot and the two passengers will hear entertainment device
#1. In normal operation, whenever a person speaks, the music will automatically mute and then will
gradually return to the original listening level when the radio or intercom activity ceases.
When in the A LL mode, all parties will hear the entertainment input #1. While in the C REW mode, pilot
and copilot will hear entertainment input #1 while the passengers may listen to entertainment input #2.
It is also possible to use only one entertainment input device for both entertainment inputs (1 and 2). A
switch (DPDT) should be installed between the single entertainment device and entertainment input #1.
This will allow the pilot and copilot decide if they hear entertainment while in the Crew mode.
3.7.4 Soft Mute
The “Mute” button controls the music #1 & #2 muting circuits. This “Karaoke Mode” prevents the music
muting when a sing-a-long is desired. "Soft Mute" mode only applies to entertainment input #1 & #2.
3.8 Marker Beacon (7)
The Marker Beacon Receiver included in the PMA6000B uses visual and audio indicators to alert you
when the aircraft passes over a 75 MHz transmitter.
The Blue lamp, labeled "O," is the Outer Marker lamp and has an associated 400 Hertz 'dash' tone. The
lamp and tone will be keyed at a rate of two tones/flashes per second when the aircraft is in the range of
the Outer Marker Beacon.
The Amber lamp, labeled "M," is the Middle Marker lamp and is coupled with a 1300 Hertz tone. It is
keyed alternately with short 'dot' and long 'dash' bursts at 95 combinations per minute.