PS Engineering PMA8000MP3 Pilot’s Guide - Manual (Page 4)

Page 4 Revision 6 PMA8000B MP3
Cockpit Speaker (6)
The SPR switch will place all
selected audio on the cockpit
speaker when this switch is se-
lected. The speaker will carry
the audio as heard by the pilot.
Unswitched audio 1, 3 and 4 (the inputs dedicated to autopilot discon-
nect, altimeter warning, etc.) will come through the speaker regard-
less of the speaker button position.
Depending on installation, important audio annunciations such as ra-
dar altimeter or autopilot disconnect will come over the speaker even
if it is not selected, while other unswitched, but
muted inputs, such as GPS alerts, will only be pre-
sent if the SPR button is selected. Consult your
professional avionics installer for these important
configuration details.
Intercom Operation
IntelliVox® VOX-Squelch
IntelliVox® is PS Engineering’s proprietary intercom squelch control.
Through the use of digital signal processors, the each individual mi-
crophone input is monitored, and opens instantly when human speech
is detected. This results in seamless conversations aboard the airplane
for crew and passengers, without annoying syllable clipping or fa-
tigue-inducing noise.
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 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 mo-
ments.
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 important to have the microphone element par-
allel to your mouth, and not twisted inside the cover.
Note: For optimum microphone performance, we recommend use of a