PS Engineering PMA7000M-S Pilot’s Guide - Manual (Page 6)

6 PMA7000-Series Pilot Guide
1.6 Intercom Operation
1.6.1 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 sampled. Non-
voice signals are blocked. When someone speaks, only their microphone cir-
cuit 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.
NOTE:
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 lev-
els (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 han-
gar, or without the engine running. This is normal.
For optimum microphone performance, PS Engineering recommends installa-
tion 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.
1.1.1 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 pas-
sengers' 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 ad-
justed at the headset. If desired, passen-
ger volume level can be adjusted by a
screwdriver adjustment at the top of the
tray.
7 PMA7000-Series Pilot Guide
1.1.1.1 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 En-
gineering modifies headsets to add stereo capability, using high-fidelity speak-
ers. Contact factory for details.
1.1.2 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 only when
the unit is not in the "Split" mode. Then, the
pilot and copilot intercom is controlled with the
ICS button.
I SO : (Up Position): The pilot is isolated from
the intercom and is connected only to the air-
craft radio system. He will hear the aircraft ra-
dio reception (and sidetone during radio trans-
missions). Copilot will hear passengers’ intercom and Entertainment 1, while
passengers will hear copilot intercom and Entertainment 2. Neither will hear
aircraft radio receptions or pilot transmissions.
A LL : (Middle Position): All parties will hear the aircraft radio and intercom.
Crew will hear Entertainment 1, passengers will hear Entertainment 2. Dur-
ing any radio or intercom communications, the music volume automatically
decreases. The music volume increases gradually back to the original level
after communications have been completed.
C REW (Down Position): Pilot and copilot are connected on one intercom
channel and have exclusive access to the aircraft radios. They may also listen
to Entertainment 1. Passengers can continue to communicate with themselves
without interrupting the Crew and also may listen to Entertainment 2.
Anytime the PMA7000M-S is in either the C OM 1/C OM 2, C OM 2/C OM 1
("Split Mode"), the pilot and copilot intercom is controlled with the ICS but-
ton. The passengers will maintain intercommunications, but never hear air-
craft radios.
1.1.2.1 Entertainment Input
The audio selector panel has provisions for two separate entertainment input
devices. They operate independently in the PMA7000M-S. The volume con-
trol does not affect music level.