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AA12S Series Compact Audio Controller Manual SM69 Rev. 4.00
2.3.2 Cautions
In all installations, use shielded cable exactly as shown and ground as indicated.
Significant ground loop and noise problems may result from not following these
guidelines.
The shielding and routing of the MIC and ICS TIE LINES used in the AA12S installation
is very critical and poor performance of the aircraft audio system will result if these
issues are not handled properly.
The operation of the VOX intercom can be severely degraded by the quality and type or
mix of microphones used in the aircraft. If one user has a very 'hot' microphone, it will
present more electrical signal to the VOX circuit and the VOX SQUELCH will have to be
set to quiet this microphone. The other microphones may not be able to generate
enough electrical energy to overcome this VOX SQUELCH setting, and will break up or
not be heard at all.
2.3.3 Notes
Audio performance can be impaired by the introduction of airframe electrical noise at
the headset jack locations. For best results, all headset jacks should be fully isolated
from the airframe.
2.3.4 Cabling and Wiring
All unshielded wire should be MIL-W-22759 or equivalent. 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 inches from the end of the wire to the shield termination to allow the hood to be
easily installed. Note that the hood is a ‘clamshell’ hood, and is installed after the wiring
is complete.
All wiring should be at least 22 AWG, except power and ground lines, which should be
at least 20 AWG. Ensure that all ground connections are clean and well secured.
2.3.5 Post-Installation Checks
If any preset requires adjustment, be sure this is carried out before the aircraft leaves,
and that the unit and its mating connector are secured before departure. Make all
required log book entries, electrical load, weight and balance amendments and other
paperwork as required by your local regulatory agency.
Page 2-2 Oct 13, 2005
ENG-FORM: 805-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.