Garmin PAV80 operation manual Cable Harness Wiring, Noise

Front of tray

PS Engineering

PAV80 Series IFE System

Installation and Operator’s Manual

		Washer 475-632-0001
		Nut 475-632-0005
		475-632-0007
		Screw (x2)
		120-425-4402	Rear
	475-440-0007 (2 plcs)	Connector	of tray
A	Screws
B		C

430-730-0025 Tray Shield

Figure 2-5 -Tray Assembly

2.4Cable 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.

2.4.1Noise

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).

200-800-0101 Page 2-4 Rev 2 Sept. 2003