Operating instructions

202-920-0100 Page 3 OCT. 2010

button illuminates to indicate that the audio is

selected. The top row of RCV pushbuttons (#

3) allows selection of the receiver audio.

The PMA9000EX-Series has an automatic

com receiver selector system. Audio from the

selected transceiver is automatically heard in

the headsets and speaker (if selected). You can check this function by

switching from C

OM 1 transmitter to Com 2 transmitter by pressing

the C

OM 2 transmitter selector pushbutton. See that the associated

Com 2 receive pushbutton indicator light that is located immediately

above the Com 2 transmitter pushbutton turns green. This guarantees

that the pilot will always hear the audio from the transceiver selected

for transmit.

The PMA9000EX “remembers” the receiver selection, so that when

switching transmitters from C

OM 1 to COM 2, if COM 2 audio was

previously selected, C

OM 1 audio will continue to be heard. This

eliminates the pilot having to switch Com 1 audio back on, after

changing transmitters.

When switching from C

OM 1 to COM 2 while Com 2 was not previ-

ously selected, C

OM 1 audio will be switched off. In essence, switch-

ing the mic selector will not override prior selection of COM receiver

audio.

In normal (not split) modes, the PMA9000EX gives priority to the

pilot’s radio Push-To-Talk (PTT). If the copilot it transmitting, and

the pilot presses his PTT, the pilot’s microphone will be heard over

the selected com transmitter.

1.1.1.1 Split Mode

The split mode can be activated at any time by pressing the C1 and

C2 XMT

buttons at the same time. This places the pilot on COM 1

and the Copilot on C

OM 2. All four COM indicators will illuminate to

indicate that the panel is in split mode.

In split mode, the intercom will remain active in the selected mode,

however, and music will be muted in the crew positions.

Pilot on C

OM 2 and Copilot on COM 1 is not possible.

Split Mode does not turn off Nav, ADF, or Aux selected audio to

pilot. However, the copilot will only hear the copilot-selected com

receiver and unswitched inputs