PS Engineering PMA7000M-S Installation Manual - Manual (Page 23)

PS Engineering
PMA7000M-S Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-070-0012 Page 3-4 Rev. 12, Sept.2000
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
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 can be adjusted at the headset. If
desired, passenger volume level can be adjusted by a screwdriver adjustment at the top of the tray (see fig-
ure 2-1).
3.6.2.1 Mono headsets in Stereo Installation
All passenger headsets are connected in parallel. Therefore, if a monaural headset is plugged in to a
PMA7000M-S Stereo installation, one channel will be shorted. Although no damage to the unit will occur,
all passengers will lose one channel, unless they switch to the “MONO” mode on the headset. PS Engi-
neering modifies headsets to add stereo capability, using high-fidelity speakers. Contact factory for details.
3.6.3 Intercom Modes
The lower switch on the left side is a 3-position mode switch that allows the pilot to tailor the intercom
function to best meet the current cockpit situation. The description of the intercom mode function is valid