AMS42/AMS44 Dual Channel Audio Controller
SM19 Installation and Operation Manual
May 29, 2012 Rev: 5.00
Page 2-2
ENG-FORM: 805-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
2.4.2 Cautions
In all installations, use shielded cable exactly as shown and
ground as indicated
. Significant problems
may result from not following these guidelines.
All audio installations can be seriously degraded by incorrect wiring and shielding, and may result in
abnormal cross-talk, hum and ground-loop noise. Be especially careful with all microphone wiring and
Tie Line wiring, as these lines carry the lowest level signals in the aircraft.
All microphone and headset jacks should be electrically isolated from the airframe or significant ground
loop noise may result.
Failure to follow the installation and wiring instructions provided in this manual for power and ground
connections, including the rating of the circuit breaker, may lead to damage in the power input circuitry of
the unit.
2.4.3
Cable and Wiring
All unshielded wire shall be selected in accordance with AC43.13-1B Change 1, Paragraphs 11-76
through 11-78. Wire types should be to MIL-W-22759 as specified in AC43.13-1B Change 1, Paragraphs
11-85, 11-86, and listed in Table 11-11. For shielded wire applications, use Tefzel MIL-C-27500 shielded
wire with solder sleeves (for shield terminations) to make the most compact and easily terminated
interconnect. Follow the wiring diagrams in Section 2.6 as required.
Allow 3" from the end of the wire to the shield termination to allow the connector hood to be easily
installed. Note that the hood is a "clamshell" hood, and is installed after the wiring is complete. Aircraft
harnessing should permit the unit to be lowered from the panel for easy access to all side adjustments.
Do NOT mount the unit until all adjustments have been carried out.
All wiring should be at least 24 AWG, except power and ground lines, which should be at least 20 AWG.
Ensure that the ground connection is clean and well secured, and that it shares no path with any
electrically noisy aircraft accessories such as blowers, turn and bank instruments or similar loads. Power
to this unit must be supplied from a separate breaker (1 amp) or fuse (1 amp fast blow), and not attached
to any other existing breaker without additional protection.
Before the unit is mounted
, make all functional tests and trimpot adjustments. Be sure the harness has
enough clearance to permit the unit to be dropped down for re-adjustment, if needed later. Make sure
that the connector locks are tightened, and the unit is securely fastened to the panel
before any flight is
attempted
.
2.5 Adjustments
and
Connections
The unit ships from the factory with all internal adjustments set to the normal test levels. Once installed in
the aircraft, it may be desirable to change some of these settings to best suit the local operating
environment. The internal adjustments are located on the top and sides of the unit, and are as follows:
