Operating instructions

202-890-0402 Rev. 2 Page 7 Oct. 2010 PMA8000B Pilot Guide
Intercom Operation
IntelliVox® VOX-Squelch
No adjustment of the IntelliVox® squelch control is necessary. There
is no field adjustment. Through three individual signal processors, the
ambient noise appearing in all six microphones is constantly being
sampled. Non-voice signals are blocked. When someone speaks, only
their microphone circuit opens, placing their voice on the intercom.
The system is designed to block continuous
tones, therefore people humming or whistling
in monotone may be blocked after a few mo-
ments.
For consistent performance, any headset micro-
phone must be placed within ¼-inch of your
lips, preferably against them. (ref: RTCA/DO-
214, 1.3.1.1 (a)). It is important to have the
microphone element parallel to your mouth,
and not twisted inside the cover.
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 In-
telliVox® to open momentarily. This is normal.
The IntelliVox® is designed to work with normal aircraft cabin noise
levels (70 dB and above). Therefore, it may not always recognize
speech and clip syllables in a quiet cabin, such as in the hangar, or
without the engine running. This is also normal.
Intercom Volume Control (7)
The small volume control knob adjusts the loudness of the intercom
for the pilot and copilot. It has no effect on selected radio levels, mu-
sic input levels or passengers' volume level.
The larger, outer volume control knob controls intercom volume or
the passengers. 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 con-
trols; therefore, volume also can be further adjusted at the individual
headset.
Mono Headsets in Stereo Installation
The pilot and copilot positions work with stereo or mono headsets.