PS Engineering PMA7000B Pilot’s Guide - Manual (Page 5)

5 PMA7000B Pilot Guide R6 202-780-0001
Intercom Operation
IntelliVox® VOX-Squelch
No adjustment of the IntelliVox® squelch control is necessary. There is no
field adjustment. Through 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 hum-
ming or whistling in monotone may be blocked after a few moments.
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 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! There-
fore, it has a tendency to miss initial syllables in a quiet cabin,
such as in the hangar, or without the engine running. This is
normal, for best performance, go fly!
For optimum microphone performance, PS Engineering recommends in-
stallation 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.
Intercom Volume Control
The intercom volume control for pilot and copilot is the smaller concentric
knob on the left side of the unit. This volume control knob adjusts the loud-
ness of the intercom for the pilot and copilot only. It has no effect on se-
lected radio levels, music input levels or passengers' volume level.
Adjust the radios and intercom volume for a comfortable listening level for
the pilot. Most general aviation headsets today have built-in volume con-
trols; therefore, passenger volume can be adjusted at the headset.
The outer knob is the passenger volume control. This volume control knob
adjusts the loudness of the intercom for the passengers only. It has no effect
on selected radio levels, music input levels or crew’s volume level.
Mono headsets in Stereo Installation
All passenger headsets are connected in parallel. Therefore, if a monaural
headset is plugged in to a PMA7000B Stereo installation, one channel will
be shorted. Although no damage to the unit will occur, all passengers will