PS Engineering PMA7000B Spezifikationen PDF herunterladen (Seite 13)

PS Engineering

PMA7000B Series Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-780-0005 Page 2-6 Rev. 11, February 2015

If the KMA 24 installation includes “External Speaker” or “Internal Speaker” connections to J1 Pins X and

U respectively), these will have to be disconnected to avoid interference with the Unswitched inputs #3 and

#4.

NOTE: Inputs 1, 2 and 4 are fixed (1:1), and any audio level adjustments must be made at the input source.

Input 3 (Bottom Connector pin U) has adjustable attenuation.

2.4.12 PA Mute (J1, Pin 18)

Pin 18 of J1 is a TTL logic output that is pulled low during PTT operation. This serves as an input to exter-

nal public address system to prevent feedback during transmissions.

2.4.13 Public Address Function (J2, Pin 18)

By connecting the top connector (J2), Pin 18 to ground, the pilot’s microphone audio is placed on the cabin

speaker output. When the pilot’s PTT is activated, his voice is heard over the speaker. The copilot can co n-

tinue to use the selected com.

We recommend installing a toggle switch to connect the cabin speaker output (pin W, bottom connector) to

a rear or public address speaker instead of the cockpit speaker close to the pilot. This will prevent feedback.

2.4.14 Control Output (J2, Pin A)

Pin A of the top connector is pulled to ground whenever the AUX button is depressed. This serves as a con-

trol line for external devices, such as a entertainment system that the pilot wishes to control.

This could be used in conjunction with a PA to control J2, Pin 18, as well as an external relay to change to

the cabin speaker from the cockpit.

This pin can also be used to control passenger Karaoke Mode, by connecting to pin V of the J2.

2.4.15 Intercom wiring

The top connector (J2) is for the intercom and additional functions. See Appendix 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 top connector harness can be custom made by PS Engineering, Inc. Simply call the factory and

obtain a wire harness work-sheet. The harness will be made to your specifications and fully functionally

tested. All hardware is included.

2.4.15.1 Alternate Intercom Mode (Bottom connector Pin 14)

(Units with serial number beginning with (“J” or above)

If an external switch is installed between pin 14 of the bottom connector and ground, the PMA7000B can

be placed into “Alternate Intercom Mode.” In this mode, when the ICS is in “ALL” mode, the passe ngers

will not hear aircraft radio. In addition, the passengers’ microphones are not heard by the crew when the

radios are active.

2.4.16 Entertainment Input

The PMA7000B has two INDEPENDENT music inputs. Entertainment input number 1 is J2 pins 15 (left

channel) and 16 (right channel), WRT pin T, and is provided to the pilot and copilot. Entertainment number

2 is provided to the passengers at all times.

Entertainment 1 and 2 must be connected together in order for all positions to hear the same music source.

We recommend installing a DPDT switch to allow isolation of the music sources if desired.

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