Communications Transmit (Xmt) Selection; Com Audio Selector - PS Engineering PAC45J Pilot's Manual And Operation Manual

Communications Transmit (XMT)
Selection (8)
The PAC45J has a rotary control knob to select
communications transceiver functions. To select
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 PAC45J, you will
never transmit on a radio that you are not receiving. The selected audio is indi-
cated by both knob position and the green text. The pilot and copilot control-
lers 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 (4)

The communications receiver audio sources are controlled by a combination
switch/volume control. Communication audio from another radio, not selected
for transmit, can be heard by placing the associated RCV switch in the out
position. 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 se-
lected comm audio is turned all the way down on the audio controller because
it cannot turn the selected receive audio all the way off.
The Radio Master Control Volume (small inner knob labeled RAD)
should always be at MAX volume.
The volume controls on the individual radios is the normal way of changing
respective radio volumes. The RAD volume control is to allow an easy way to
reduce all radio volumes temporarily to assist in intercommunications
(intercom).
The preferred sequence of volume setting is:
1.
Headset volume controls – all the way up
2.
Master radio volume (if applies) – all the way up
3.
Intercom volume – noon
4.
Individual comm selection/volume – 3 o'clock (unity gain)
5.
Set Radio volumes to comfortable levels, no higher than 80%
PAC45J Pilot Guide Revision 1 202-045-2200 Page 3