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PS Engineering
PAC45A Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-045-0100
Page 3-5
January 2020
NOTE
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 Micro-
phone Muff Kit from Oregon Aero (1-800-888-6910). This will not only optimize VOX perfor-
mance, but will improve the overall clarity of
all
your communications.
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
All
90015
Peltor
7003
7004
90010
90015
Pilot
11-20 & 11-90
90015
Sennheiser
90015
Telex
Airman 750, Echelon
AIR3000
90015
90010
Table 3-1
Mic Muff ™ Part Numbers
3.5.2 Push to talk intercom (PTT ICS)
Pressing the
copilot’s
intercom volume knob (ICS VOL) will place the system (all headsets) into
the Push-to-talk (PTT for Intercom use) mode. This will disable the voice activation (VOX) and
require that the external push to talk intercom buttons for each position be used to speak on
the intercom.
Push the knob again and the systems (all headsets) toggles back to voice activa-
tion. The mode is shown by the green indication in the text.
3.5.3 Intercom Volume Control
The intercom volume control knob (outer knob) adjusts the loudness of the inter-
com for the intercom stations(s) connected to the audio controller panel. It has no
effect on selected radio levels, or music input levels.
In the PAC45D, the pilot volume control adjusts the pilot’s intercom volume. The
copilot’s knob adjusts the copilot, and any connected passengers.
3.5.3.1 Monaural headsets
The pilot and copilot positions work with stereo or mono headsets. However, MultiTalker will
not be presented correctly unless stereo headsets are used, and oriented correctly on the head,
left and right.
NOTE: For the full effect of MultiTalker Dimensional Sound, stereo headsets
must be used
,
and the left/right orientation observed.
PRELIMINARY