Page 4 202-890-0702 PMA8000BT Pilot Guide Rev. 9
field adjustment. 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 microphone 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.
Note: For optimum microphone performance, we recommend use of a Mi-
crophone Muff Kit from Oregon Aero (1-800-888-6910,
www.oregonaero.com ). This will not only optimize VOX performance, but
will improve the overall clarity of all your communications.
You should also keep the microphone out of a direct wind. Moving your
head through an 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). Therefore, it may not always recognize
speech and clip syllables in a quiet area, 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, music input levels
or passengers' volume level.
The larger, outer volume control knob controls intercom volume for the pas-
sengers. It has no effect on radio or music levels.
Mono Headsets in Stereo Installation
The pilot and copilot positions work with stereo or mono headsets. If a mon-
aural headset is plugged in to a PMA8000BT Stereo installation, one channel
will be shorted and all passengers will lose one channel unless they switch to
the “MONO” mode on the headset.
Intercom Modes (8)
The intercom has three modes. The description of
the intercom mode function is valid only when the
unit is not in the "Split" mode. Then, the pilot and
copilot intercom is controlled with the Mute but-
ton.
This button cycles through the intercom modes,
from top to bottom and then back up.
ISO: The pilot is isolated from the intercom and is connected only to the air-
craft radio system. He hears the radios (and sidetone during radio transmis-
sions). The copilot and passengers will hear the music sources as configured
by the audio panel configuration Function keys. See page 11—Smart Func-
tion Keys for more details.
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