PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0008 Page 3-4 Rev. 8, June 2003
3.6.2 Split Mode, Dual Panel
In a dual panel installation, both pilots have access to any combination of transceivers. Because there is
cross communication, each PAC24 knows the other unit’s transmitter selection. The audio panel designated
as “Pilot’s” will have transmission priority over the panel designated as copilot’s, when both panels are
keyed for transmit on the same
radio.
It is not
necessary to activate the split mode by holding the buttons in a dual installation.
3.6.3 Split Mode, Observer Panel (-04XX)
In observer mode, split mode is selected on the crew panel in the same manner as a single panel (for exam-
ple, press COM1 and COM2 for COM1/2 mode). The observer’s panel will split as in a conventional dual
panel installation.
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 indi-
vidual 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 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! 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.
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
(41 pagine)
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