PS Engineering PMA450 Pilot’s Guide - Manual (Page 7)

202-450-0000 Page 7 Nov. 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 changed
from Low to High sensitivity by press-
ing and holding the MKR button for 2
seconds, or until “H” appears in the
display, indicating High sensitivity is
activated.
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 opti-
mize VOX performance, but will improve the
overall clarity 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 pas-
sengers. It has no effect on radio or music levels. (Music can be adjusted
independently from a dedicated music menu) When the volume knobs are