PS Engineering
PMA450B Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0600
Page 3-2
Rev. 5, August 2020
menu. Items are toggled on and off by pressing the line select key as well. A long press (> 1 second) will also
back up one menu level.
When navigating the menus, the screen will automatically return to this “home” screen after a period of
inactivity. This delay time is configurable from the initialization menu as well, for between 1 and 30 seconds.
A vertical
bar
next to a button indicates the button can
perform a function on that menu.
A
split bar
indicates that a secondary function is
available when that button is held for more than one
second.
Figure 3-2 Top level Menu
Communications Transmit (XMT) Selection (2)
The PMA450B has four buttons to select communications transceiver functions, two
each C1 and C2. C1 refers to VHF COM 1, and C2, to VHF COM 2. To select a VHF
COM for transmit; push the lower button in the XMT (transmit) section. The radio is
automatically selected to receive incoming radio calls when the XMT is selected. With
a PMA450B, you will
never
transmit on a radio that you are not receiving.
To select a VHF COM radio to listen only, push the C1 or C2 button in the RCV
(Receive) section.
The PMA450B will remember when you have selected a radio for receive only, and
then switch to it for transmission and switch back.
3.4.1
Split Mode
In the SPLIT mode, the pilot position transmits and receives on COM 1, and the copilot can transmit and
receive on COM 2 independently.
Pressing the C1 and C2 XMT buttons (above the └
SPLIT
┘ legend), puts the PMA450B into SPLIT com
mode.
In split mode:
Position
COM 1
Re-
ceive
COM 1
Trans-
mit
COM 2
Re-
ceive
COM 2
Trans-
mit
Switched
Audio
Unsw. Au-
dio
Copilot
Inter-
com
Passen-
ger Inter-
com
Pilot
Yes
Yes
NO
NO
Yes
Yes
NO
NO
Copilot
NO
NO
Yes
Yes
NO
Yes
NO
NO
Passen-
gers
NO
NO
NO
NO
NO
NO
NO
YES
•
The intercom is deactivated automatically when you enter SPLIT mode.
o
Push the ICS button until the green LED lights up CRW to restore intercom between pilot
and copilot.
o
Intercom between crew and passengers is not possible in split mode
•
The spatial component of IntelliAudio is defeated in split mode.
•
To exit SPLIT mode, select either C1 or C2 XMT button (lower button)
COM Audio Selector (3)
Communication audio from the other radio, not selected for transmit, can be heard by pressing the associated
RCV button. You will always hear the audio from the selected transceiver.
