Specifications

AA24/AA25 Series Single User Audio Controller
SM18 Installation and Operation Manual
April 14, 2012 Rev: 5.00 Page 2-2
ENG-FORM: 805-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
Do not take a ground from the instrument panel or similar location that shares a ground return with a turn
and bank, horizon or other motor driven instrument. This may cause the InterVox unit to pick up the
sound of the motor as ground loop interference.
For best results, all headsets/microphones in the system should be of the same type to avoid VOX
problems and uneven volume.
2.3.3 Cable and Wiring
All unshielded wire should be Tefzel MIL-M-22759/16 or equivalent. For shielded wire applications, use
Tefzel MIL-M-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.
All wiring should be at least 22 AWG, except power and ground lines, which should be at least 20 AWG.
Ensure that the ground connection is clean and well secured.
2.3.4 Fuses and Breakers
Power protection should be provided through a 1.0 A breaker, and not attached to any other existing
breaker without additional protection.
2.3.5 Adjustments
See 3D drawing AA24\001\903-0 at the end of this section of the manual for the adjustment locations.
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 Direct Audio level (DIR AUD LEVEL) and sidetone level (S/T LEVEL) can be adjusted at the time of
installation. The adjustment pots are accessed through holes in the upper cover, and can be rotated
clockwise to increase the level, and counterclockwise to decrease it.
2.3.6 Post-Installation Checks
2.3.6.1 Resistance Checks
Do not attach the AA24 or AA25 until the following conditions are met.
Check the following:
a) Check J101, pin <1> for +28 Vdc relative to ground.
b) Check J101, pin <9> for continuity to ground (less than 0.5Ω).