PS Engineering PMA450 Pilot's manual and operation manual - page 7
202-450-0000
Page 7
Aug. 2014 PMA450 Pilot Guide
will indicate the receiver volume in this menu. NOTE: marker volume can-
not be turned completely off. Units without marker receiver will not have a
MKR Volume menu.
Marker Beacon sensitivity is set using an external toggle switch, if desired.
The PMA450 defaults to low sensitivity, and will be in high sensitivity if the
switch is closed, connecting J2-Pin 30, to ground.
Intercom Operation (8)
No adjustment of the IntelliVox® squelch control is necessary. Through indi-
vidual signal processing, 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 inter-
com.
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-214A, 1.3.1.1
(a)).
NOTE
It is also a good idea to keep the microphone out of a direct wind path. Mov-
ing 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 instal-
lation of a Microphone Muff Kit from Oregon Aero (1-800-888-6910). This
will not only optimize VOX performance, but will improve the overall clar-
ity of all your communications.
Intercom Volume Control (1)
The smaller inner volume control knob adjusts the loudness of the intercom
for the pilot and copilot. It has no effect on selected radio levels, music input
levels or passengers' volume level.
The outer, larger volume control knob controls
intercom volume for the passengers. It has no
effect on radio or music levels. When the vol-
ume knobs are moved, the green volume bar
indicator will show the level of the changing
intercom volume.
Adjust the radios (at the radio itself) and inter-
com volume for a comfortable listening level.
Most general aviation headsets today have built-