PS Engineering PMA450 Installation Manual - Manual (Page 22)

PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000 Page 3-2 Rev. 3, November 2014
3.3 Menu Selection (6)
The PMA450 uses a Liquid Crystal Display and three line-select buttons to access advanced functionality
in a very logical manner. Press the line select key to select a specific item on each menu. Items are toggled
on and off by pressing the line select key as well.
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 but-
ton 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. These functions are:

Public Address (PA – middle button)

Speaker (SPR – lower button)
Figure 3-2 Top level Menu
3.4 Communications Transmit (XMT) Selection (2)
The PMA450 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 PMA450, 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 PMA450 will remember when you have selected a radio for receive only, and then switch to it for
transmissionand 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 PMA450 into SPLIT com
mode.
In split mode:
Position COM 1
Receive
COM 1
Transmit
COM 2
Receive
COM 2
Transmit
Switched
Audio
Unsw. Au-
dio
Copilot
Intercom
Passenger
Intercom
Pilot Yes Yes NO NO Yes Yes NO NO
Copilot NO NO Yes Yes NO Yes NO NO
Passengers 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, reselect C1 or C2 XMT button
3.5 COM Audio Selector (3)
Communication audio from the other radio, not selected for transmit, can be heard by pressing the associat-
ed RCV button. You will always hear the audio from the selected transceiver.