PS Engineering PMA8000BT NUI Installation Manual - Manual (Page 26)

PS Engineering
PMA8000BT Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-1702 Page 3-4 New, April 2011
3.7 Intercom Operation
3.7.1
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 sam-
pled. 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 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)).
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, PS Engineering 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)
The inner 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 outer volume control knob controls intercom volume for 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 controls; therefore, volume also can be further adjusted at the individual head-
set.
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 PMA8000BT Stereo installation, one channel
will be shorted. Although 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.