PS Engineering PMA8000MP3 Installation Manual - Manual (Page 13)

PS Engineering
PMA8000B-MP3 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-0600 Page 2-6 Rev. 6, Oct. 2010
NOTE
The front-mounted utility jack is intended for portable equipment that is advisory in nature. It is NOT
INTENDED for use as a primary warning channel. Audio of importance MUST ALWAYS be hard-wired
into the unswitched inputs of the audio panel.
2.4.11 Public Address Mode
By pressing the Mute and SPR pushbuttons at the same time, the PMA8000B-MP3 will be placed into
public address (PA) mode. In this mode, the pilot will be talking over the cockpit speaker when he presses
his PTT switch. Copilot will still continue on the selected COM radio.
To enable the PA Digital Output located at the rear connector, the interna l configuration jumper, J4,
MUST be placed across both pins in the header. This jumper is shipped as open from the factory. Contact
PS Engineering for details on changing this configuration jumper.
When this Digital Output is enabled, J2 Pin 19 will go low when in PA mode, providing a logic level that
can be used to incorporate a speaker-switching scheme. This 50 mA circuit (10Ω Z) can control a switch-
ing means such as a relay that would transfer the speaker output amplifier from the cockpit speaker to
drive another cabin speaker. If the PA mode is used with a microphone in proximity to an active cockpit
speaker, feedback might result.
2.4.12 PA Mute (J2, Pin 12)
Pin 12 of J2 is a TTL logic output that is pulled low during PTT operation. This serves as an input to ex-
ternal public address system to prevent feedback during transmissions.
2.4.13 Miscellaneous Logic Output (J2, Pin 18)
Pin 18 of the J2 connector is pulled to ground whenever the AUX button is depressed. This serves as a
control line for external devices, such as an entertainment system that the pilot wishes to control.
This pin can also be used to control passenger Karaoke Mode, by connecting to pin 13 of the J2, or as a
PA cockpit/cabin speaker relay control.
NOTE
J2, Pin 18 should NOT be used if the AUX is going to be used to switch DME or auxiliary audio.
2.5 Intercom wiring
See Appendix C and D for intercom connection configurations. It is critical to the proper operation of this
system to have this connector wiring made in accordance with these diagrams. Use 2 - and 3-conductor,
MIL-spec cable as shown. Connect the shields at the audio panel end only, and tie to the audio low inputs
as shown.
NOTE
The intercom harness can be custom made by PS Engineering, Inc. Simply call the factory or www.ps-
engineering.com to obtain a wire harness work sheet. The harness will be made to your specifications and
fully functionally tested. Harness can be ordered with jack, or without the intercom jacks installed, for
easier wire routing through the aircraft.
2.5.1 Entertainment Inputs
In addition to the internal MP3 player, the PMA8000B-MP3 has two INDEPENDENT music inputs,
PLUS a front mounted jack that is connected to Entertainment 1. Entertainment input number 1 is J2 pins
23 (left channel) and 24 (right channel), with respect to pin 25, and Entertainment number 2 is connected
to 26 (left channel), 27 (right channel), with r espect to 28. Refer to Section 3.11.3 for more information.