PS Engineering
PMA7000M-S Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-070-0004 Page 3-4 Rev. 4, Oct.200-070-0006 Page
3.6 Intercom
3.6.1 IntelliVox™ VOX-Squelch
No adjustment of the IntelliVox™ squelch control is necessary. 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 moments.
For best performance, the headset microphone must be placed within ¼ inch of your lips,
preferably against them. 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.
For optimum microphone performance, PS Engineering, Inc. 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.
Table 3-1 Mic Muff ™ Part Numbers
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 15K & 20K 90015
Peltor 7003
7004
90010
90015
Pilot 11-20 & 11-90 90015
Sennheiser 90015
Telex Airman 750
AIR3000
90015
90010
3.6.2 Volume Control
The volume control knob adjusts the loudness of the intercom for the pilot and copilot
only. It has no effect on selected 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 controls; therefore, passenger volume
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