Garmin PAV80 - Manual (Page 12)

PS Engineering
PAV80 Series IFE System
Installation and Operator’s Manual
200-800-0101 Page 2-4 Rev 2 Sept. 2003
B
A
C
120-425-4402
Connector
475-440-0007 (2 plcs)
Screws
F
ro
nt
o
f
tr
ay
Rear
of tray
475-632-0007
Screw (x2)
Washer 475-632-0001
Nut 475-632-0005
430-730-0025
Tray Shield
Figure 2-5 -Tray Assembly
2.4 Cable Harness Wiring
Referring to the wiring diagrams contained in the 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, crimping and soldering technique must be used at all times. It is imperative that
correct wire be used.
Video Cable wiring shall be 75 Ω coax, MIL-C-17/094, RG179, or equivalent. Because of the small size,
we recommend soldering the small conductors from the RG179 coax to provide good contact.
Refer to FAA Advisory Circular 43.13-1B and 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. PS Engineering can provide a custom made harness, visit www.ps-
engineering.com for more information.
2.4.1 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 PAV80 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 12 VDC present at the connector
pin 21, of the PAV80 for the power supply to work in its designed regulation. Otherwise, it cannot ade-
quately attenuate power line noise. Shielding can reduce or prevent radiated noise (i.e., beacon, electric
gyros, switching power supplies, etc.) However, installation combinations can occur where interference is
possible. The PAV80 was designed in a RFI hardened chassis and has internal Electromagnetic Interfer-
ence (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
airframe that are detected by the audio system. Follow the wiring diagram very carefully to help ensure a
minimum of ground loop potential. Use only Mil Spec shielded wires (MIL-C-275000, or better).