PS Engineering PDA360EX Installation Manual - Manual (Page 11)

PS Engineering Inc. ®
PAR100EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-760-0000 Page 2-4 Rev. 12, Jan. 2014
2.4.4 Communications Push-to-Talk
An important part of the installation is the PTT (Push-To-Talk) switches that allow the use of your air-
craft communications radio for transmissions. There are three typical configurations that can be used.
Select the case that best fits the installation. Only the person who presses their PTT switch will be heard
over the radio. If the pilot and copilot both use the PTT, the only pilot position has access to the radio.
The pilot position will have PTT control regardless of the mic selector switch or copilot PTT when the
PAR100EX is in the
OFF /E MG mode.
CASE I: PTT is built into both pilot and copilot yokes.
CASE II: PTT is in pilot yoke only. This configuration requires a modified external PTT switch plugged
into the copilot's microphone jack. (See Appendix A). When the copilot's PTT is pressed, the intercom
switches the microphone audio from pilot to copilot mic.
CASE III: No built in PTT. This requires two built in PTTs to be installed, or modified external PTT
switches to be used. Modify external PTT as required. See Appendix A.
2.4.5 Audio Panel interface
The PAR100EX is designed to interface with standard aircraft avionics, and presents a 500  receiver
impedance. For best results, a twisted-shielded cable is recommended from the avionics audio source to
the audio panel, with the shield grounded at the audio panel end.
Inputs A1 and A2 can be used to control navigation receiver audio, J1 Pins 17 WRT 18 and J1 19 WRT
20, respectively.
Some avionics do not provide a separate audio low, and may introduce additional electrical noise into the
system. For best results, connect the audio low from the audio panel to the radio ground, using one con-
ductor of the twisted-shielded cable.
2.5 M760REM VHF COM Interface
2.5.1 M760REM Connector
The M760REM has a 15-pin solder type connector.
1 Mic Audio Hi
2 RS232 TX (data out)
3 No Connect
4 No Connect
5 RS232RX (data in)
6 No Connect
7 PTT
8 No Connect
9 Radio Power
10 No Connect
11 Aircraft Ground
12 No Connect
13 No Connect
14 COM audio Output Hi
15 No Connect
2.5.2 Interfacing the M760REM as Single, COM 1 or COM 2
The PAR100EX/ Microair M760REM can be configured to be a stand-alone COM, or as COM 1 or COM
2 in a multiple radio installation.
PS Engineering recommends that the PAR100EX/M760REM be used as COM 2. In the event of a failure,
the PAR100EX will be in fail-safe, and COM 1 can be used.