PS Engineering PAR200A Installation Manual - Manual (Page 10)

PS Engineering Inc. ®
PAR200A Audio Selector Panel, COM radio Controller and Intercom System
Installation and Operator’s Manual
200-228-0200 Page 2-3 June 2014
imum of ground loop potential. Use only Mil Spec shielded wires (MIL-C-275000, or better). Under no
circumstances combine a microphone and headphone wiring into the same shielded bundle. Always use a
2- or 3-conductor, shield wire as shown on the installation-wiring diagram.
The shields can be daisy-chained together, and then connected to the ground lugs mounted on the center of
the back plate.
Radiated signals can be a factor when low level microphone signals are "bundled" with current carrying
power wires. Keep these cables physically separated. It is very important that you use insulated washers to
isolate the ground return path from the airframe to all headphone and microphone jacks.
2.4.1.1 Music Inputs and Noise
PAR200A units utilize differential music inputs to help prevent noise from entering the music system. This
feature is usually transparent to the installer, however, it is important that the appropriate music signal and
ground connections are made directly to the dedicated music signal and ground inputs on the PAR200A.
The power for IFE and audio panel should be a common bus.
If a music jack is installed for Music 1 or 2, we strongly recommend isolating the jack from airframe
ground, by using an insulated mounting plate.
NOTE
Adding a high-performance audio control system, particularly in conjunction with high-performance active
noise canceling headsets, cannot improve on older avionics that were designed for cabin-speaker use. PS
Engineering makes no claim that the audio panel will provide a noise-free audio quality under all installa-
tion conditions, particularly with older avionics.
2.4.2 Audio Panel Tray and Connector Assembly
The rack connectors mate with two 44-pin connectors in the PAR200A. The connectors are a sub-miniature
crimp-type, and require the use a hand crimp tool, from table below (or equiv.). The connectors are mount-
ed to the tray back plate with #4-40 screws (475-440-1038), from the inside of the tray and the mounting
block, 431-891-0100. Ensure that proper strain relief and chafing precautions are made during wiring and
installation, using the cable clamp (625-001-0002).
Manufacturer Crimping Tool Positioner Extraction tool
AMP 601966-1 601966-6 91067-1
Daniels AFM8 K42 M24308-1
ITT-Cannon 995-0001-584 995-0001-739 91067-1
Table 2-1 PAR200A Connector Pin crimping tools
Manufacturer Crimping Tool Positioner Extraction tool
Mil-Spec M22520/2-01 M22520/2-08
Daniels AFM8 K13-2
Table 2-2 TY91 Connector Crimping tools
2.4.3 Audio Panel interface
The PAR200A is designed to interface with standard aircraft avionics, and presents a 500
 receiver im-
pedance. 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 N1 and N2 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 conduc-
tor of the twisted-shielded cable.