Installation manual

SECTION 2

INSTALLATION INSTRUCTIONS

2.1 GENERAL

This section contains information and instructions for the correct installation of the A711 L-Series,

ACCESS/A Audio Controllers. For convenience they are referred to as A711L in the manual.

Make certain that the unit is correctly operating in accordance with the equipment user's

requirements and manufacturer’s specifications, prior to releasing the equipment for service.

2.2 EQUIPMENT PACKING LOG

Unpack the equipment and check for any damage that may have occurred during transit. Save

the original shipping container for returns due to damage or warranty claims. Check that each

item on the packing slip has been shipped in the container. Verify that the equipment's

backlighting configuration is the same as that required.

IMPORTANT! There are ferrite beads on component leads, which can produce

a muted rattle when the box is shaken, THIS IS NORMAL, DO NOT BE

ALARMED.

2.3 WIRING REQUIREMENTS

Airframe wiring should be single conductor in accordance with MIL-W-22759 or multi-conductor in

accordance with MIL-C-27500 or Raychem 44 (81044) or 55 single or multi-conductor and

shielded wire. Heat shrink solder sleeves (such as Raychem or equivalent) should be utilized for

shield termination.

All Microphone audio input and output line connections should be made with 2 conductor/twisted

pair shielded cables as illustrated. Receiver audio input lines should also be 2 conductor twisted

pair shielded cables. The power and ground lines should be a minimum of #22 AWG (#20

preferred). Keying and all audio lines may be #24 AWG or larger.

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CAUTIONS:

DO NOT bundle any low level audio lines with RF coaxial cables, 60 Hz or 400Hz AC

inverter, motor, pump or blower wiring, which can cause noise coupling between the various

systems, especially during RF transmission or pump/blower mechanical operation. Maintain as

much distance as possible from these types of wire bundles.

Note that there is really no effective field-installable shielding for magnetic coupling (which

occurs at high currents), and the only suitable prevention for this type of interference is distance

between the interfering lines. Shielded wiring is effective only for electrostatic coupling, or voltage

driven interference.