PS Engineering PMA7000CAP Installation Manual - Manual (Page 13)

PS Engineering
PMA7000M-S Series Audio Selector Panel and Intercom System
Civil Air Patrol Version Installation and Operator’s Manual
200-072-0004 Page 2-6 Rev. 4, Sept. 2000
2.5.10.1.1 Stereo entertainment
Two stereo entertainment devices (CD player, cassette player, etc.) can be connected to the
unit. Install two
1
/
8
-inch stereo jacks in a convenient location so that the pilot can plug in the
entertainment devices into the system. The audio signal at the entertainment input must be a
minimum of 500 mV P-P per channel for optimum music performance.
All entertainment devices must be switched off for both takeoff and landing.
2.5.10.1.2 Entertainment distribution
Entertainment source #1 provides music for the pilot and copilot positions, while entertainment
source #2 provides music for the four passenger positions. The PMA7000M-S-system
incorporates a "Soft Mute" system. This will mute the entertainment devices during ICS or radio
conversation.
Any signal appearing in the unswitched audio inputs will always mute the entertainment sources,
even though the passengers may not hear the audio tone itself.
Entertainment inputs #1 and #2 can be paralleled so a single entertainment source can serve
both the passengers and the crew. It is suggested however, that a switch (DPDT) is installed
between the single entertainment device and entertainment input #1. This will allow the pilot and
copilot to decide if they hear entertainment while in the Crew mode.
Caution: Local oscillators and internal signals from some entertainment equipment can cause
undesired interference with other aircraft systems. Before takeoff, operate the entertainment
devices to determine if there is any adverse effect within the aircraft systems. If any unusual
operation is noted in flight, immediately switch off the entertainment devices.
All entertainment devices must be switched off for both takeoff and landing.
2.5.10.1.3 Entertainment 2 Mute (Pin V)
The ICS button on the PMA7000M-S controls the muting (“Karoake mode”) of entertainment
source #1.
Connecting J2 pin V to ground through a SPST switch places the entertainment 2 music source
into the Karoake Mode. In this mode, incoming music and intercom conversation will not mute
the music for the passengers’ intercom net. This allows uninterrupted music during casual
conversation and at times when radio communications are of lessor importance.
2.5.11 Com 3 Audio
As installed in the standard configuration, the PMA7000M-S Com 3 audio is placed in the
output when the mic selector switch is in the Com 3 position (fully CCW). Pushing the receiver
selector buttons can monitor Com 1 Com 2 and Com 3 audio.