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July 2019 PAC45 Pilot Guide
Communications Transmit (XMT) Selection
The PAC45 has a rotary control knob to select
communications transceiver functions. To se-
lect a transceiver for transmit; turn the knob to
select the desired radio.
The radio is automatically selected to receive
incoming radio calls when the XMT is selected.
With a PAC45, you will never transmit on a
radio that you are not receiving. The selected
audio is indicated by both knob position and the
green text. The pilot copilot and observer controllers can select any of the
installed transceivers. In the case where both have selected the
same
radio
for transmission, the pilot will have priority when he uses the radio push to
talk.
COM Audio Selector
The communications receiver audio sources are controlled by a combina-
tion push on
-
push
-
off switch/volume control. Communication audio from
another radio, not selected
for transmit, can be heard
by pressing the associated
RCV switch, which will
place it in the OUT posi-
tion. The selected audio is indicated by both knob position and the green
nomenclature text.
You will always hear the audio from the selected transceiver, even if the
selected com audio is turned all the way down on the audio controller be-
cause it cannot turn the selected receive audio all the way off.
The volume of the received source is adjusted by rotating the knob. The
volume is adjusted for the pilot, copilot, and observer/passengers on their
respective panels. PS Engineering recommends a lower volume
at the radio
and higher audio panel setting
to minimize noise.
Receiver Activity Indication (
-
RXI)
PAC45 systems (HUB45 Serial Number DH1069 and above) have a Re-
ceive Activity Indicator that flashes the
selected
receiver indicator when a
signal is present on that receiver. This allows the user to spot an active ra-
dio, even if the volume is turned down. This function is set at the factory at
the installer
’
s request, and can be changed at the factory.
MultiTalker® Head Related Transfer Func-
tion (HRTF)
Communication receiver audio signals are presented to
the DSP and processed to
“
appear
”
in a different location
to the crew.
“
MultiTalker
”
(US Patent #7,391,877) speci-
