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PAC45 Pilot Guide
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 toggles back to voice activation. The
mode is shown by the green indication in the text.
Intercom Volume Control
The intercom volume control knob adjusts the loudness of the intercom for
the intercom stations(s) connected to the audio controller panel. It has no
effect on selected radio levels, or music input levels.
In 2
-
control panel installation, the pilot panel controls pilot intercom vol-
ume only, copilot panel controls copilot and passenger intercom volume.
Monaural headsets
The pilot copilot and observer 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.
All passenger headsets are connected in parallel. Therefore, if a monaural
headset is plugged in to a PAC45 Stereo installation, one channel will be
shorted. Although no damage to the unit will occur, all passengers with
stereo headsets will not hear one channel, unless they switch to the
“
MONO
”
mode on their headset.
NOTE: Mono headsets that short the tip and ring (i.e. older models) will
introduce some audio distortion when used. Modern, stereo headsets are
recommended in all positions.
Intercom Modes
The
“
ICS
”
pushbutton switch on the panel pro-
vides the selection of the intercom modes
The intercom mode defaults to
“
ALL
”
at power
up. Then the button cycles through the intercom modes, from top to bottom,
then bottom to top as: ISO, ALL CRW and CRW, ALL, ISO. A green indi-
cator shows which mode is currently active.
ISO
: The pilot or copilot that has selected ISO is isolated from the intercom
and is connected only to the aircraft radio system. He will hear the aircraft
radio reception (and sidetone during radio transmissions). The other crew
member (unless they have also selected ISO) and passengers will have radi-
os, intercom and music.
ALL
: All parties will hear the aircraft radio, intercom and music. During
any radio or intercom communications, the music volume automatically
