Installation manual

AMX240 Audio Panel Installation Manual
200-890-0240 Rev. 02
For consistent performance, any headset microphone must be placed within ¼-inch of your lips, preferably against
them. (ref: RTCA/DO-214, 1.3.1.1 (a)).
NOTE
It is also a good idea to keep the microphone out of a direct wind path. Moving your head through a vent air stream
may cause the IntelliVox® to open momentarily. This is normal.
The IntelliVox® is designed to work with normal aircraft cabin noise levels (70 dB and above). It loves airplane
noise! Therefore, it may not recognize speech and clip syllables in a quiet cabin, such as in the hangar, or without
the engine running. This is normal.
For optimum microphone performance, Avidyne recommends installation of a Microphone Muff Kit from Oregon
Aero (1-800-888-6910). This will not only optimize VOX performance, but will improve the overall clarity of all
your communications.
Manufacturer
Model
Mic Muff™ Part Number
Bose
Dynamic
Electret
M87 Dynamic
90010
90015
90020
David Clark
H10-30
H10-20, H10-40
H10-13.4
90010
90015
90015
Lightspeed
All
90015
Peltor
7003
7004
90010
90015
Pilot
11-20 & 11-90
90015
Sennheiser
90015
Telex
Airman 750, Echelon
AIR3000
90015
90010
Table 3-1 Mic Muff ™ Part Numbers
3.7.2 Intercom Volume Control (7 & 9)
The left volume control knob adjusts the loudness of the intercom for the pilot. It has no effect on selected radio
levels, music input levels or copilot and passengers' volume level.
The right side, inner volume control knob controls intercom volume for the copilot and the outer knob the passen-
gers’ volume. It has no effect on radio or music levels.
Adjust the radios and intercom volume for a comfortable listening level. Most general aviation headsets today have
built-in volume controls; therefore, volume also can be further adjusted at the individual headset.
3.7.2.1 Mono headsets in Stereo Installation
The pilot and copilot positions work with stereo or mono headsets. All passenger headsets are connected in parallel.
Therefore, if a monaural headset is plugged in to a AMX240 Stereo installation, one channel will be shorted. Alt-
hough no damage to the unit will occur, all passengers with stereo headsets will not hear one channel, unless they
switch to the “MONO” mode on their headset.
3.7.3 Intercom Modes (4)
The “ISOL” pushbutton switch on the right side of the panel provides the selection of the three intercom modes.
The description of the intercom mode function is valid only when the unit is not in the "Split" mode.
This button cycles through the intercom modes, green LED arcs show which mode is currently active.