PS Engineering PMA7000CD Installation Manual - Manual (Page 11)

PS Engineering
PMA7000CD- Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-790-0010 Page 2-3 Revision 10, September 2005
2.4 Remote Unit Connector
The remote unit uses a 15-pin Sub-D solder type connector on the player. This attaches to the mounting
tray as shown. The connector is passed into the tray through the notches provided in the opening.
470-440-0018 (2x)
475-013-0001 (2x)
425-016-0001
430-795-0020
Notches for connector
2.5 Cable Harness Wiring
Referring to the appropriate Appendix, assemble a wiring harness as required for the installation. All wires
must be MIL-SPEC in accordance with current regulations. Two- and three-conductor shielded wire must
be used where indicated, and be MIL-C-27500 or equivalent specification. Proper stripping, shielding and
soldering technique must be used at all times. It is imperative that correct wire be used.
The 6-conductor cable for the remote CD is available from PS Engineering as part number 800-022-0609.
Refer to FAA Advisory Circular 43.13-2A for more information. Failure to use correct techniques may
result in improper operation, electrical noise or unit failure. Damage caused by improper installation will
void the PS Engineering warranty.
NOTE: PS Engineering can make a custom wiring harness for the intercom and CD player portion. Call 1-
800-ICS-AERO or see
www.ps-engineering.com for details.
2.5.1 Noise
Due to the variety and the high power of radio equipment often found in today's general aviation aircraft,
there is a potential for both radiated and conducted noise interference.
The PMA7000CD power supply is specifically designed to reduce conducted electrical noise on the aircraft
power bus by at least 50dB. Although this is a large amount of attenuation, it may not eliminate all noise,
particularly if the amplitude of noise is very high. There must be at least 13.8 VDC present at the bottom
connector, pin 20, of the PMA7000CD for the power supply to work in its designed regulation. Otherwise,
it cannot adequately attenuate power line noise. Shielding can reduce or prevent radiated noise (i.e., bea-
con, electric gyros, switching power supplies, etc.) However, installation combinations can occur where
interference is possible. The PMA7000CD was designed in a RFI hardened chassis and has internal Elec-
tromagnetic Interference (EMI) filters on all inputs and outputs.
Ground loop noise occurs when there are two or more ground paths for the same signal (i.e., airframe and
ground return wire). Large cyclic loads such as strobes, inverters, etc., can inject noise signals onto the