Specifications

PS Engineering
PMA8000B Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-0100 Page 3-2 Revision 8, May 2008
switched off. In essence, switching the mic selector will not override prior selection of COM receiver au-
dio.
In normal (not split) modes, the PMA8000B 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.
In TEL mode, the pilot microphone and headphones are connected to the cell phone. The pilot PTT will
switch the pilot mic to the selected com transceiver, and allow continued aircraft communications to con-
tinue. (See Section 3.4 —TEL—for more details)
The copilot will also be able to transmit on the other selected radio with his PTT as well.
3.2.1.1 Split Mode
The split mode can be activated at any time by pressing the C
OM 1 and COM 2 XMT buttons at the same
time. This places the pilot on C
OM 1 and the Copilot on COM 2.
Pilot on C
OM 2 and Copilot on COM 1 is not possible.
NOTE
Due to the nature of VHF communications signals, and the size constraints in general aviation aircraft, it
is probable that there will be some bleed-over in the Split mode, particularly on adjacent frequencies. PS
Engineering makes no warranty about the suitability of Split Mode in all aircraft conditions.
3.2.1.2 Swap Mode (Switch from Com 1 to Com 2 remotely)
With a yoke mounted, normally open momentary switch, the pilot can change from the current Com trans-
ceiver to the other by depressing this switch. To cancel "Swap Mode," the pilot may either press the yoke
mounted switch again, or select a different Com with the XMT buttons.
3.3 Audio Selector (4)
Communication audio from the other radio, not selected for transmit, can be heard by pressing the associ-
ated RCV button. You will always
hear the audio from the selected transceiver.
Navigation receiver audio is selected through five momentary, push-button, backlit switches.
The users can identify which receivers are selected by noting which green switch LEDs are lit. Navigation
aid audio push buttons are labeled Nav 1, Nav 2, MKR (Marker), ADF and AUX (auxiliary). DME audio
(if present) will come through when the AUX button is selected. When one of these buttons is pressed, the
mode is active, and the LED will illuminate. Press the switch again and it will be "off" and remove that
receiver from the audio output.
In SPLIT mode, only the pilot will hear selected navigation audio.
3.4 Telephone (TEL) (9)
The TEL mode serves as a full duplex interface and distribution for telephone systems such as AirCell or
portable cellular phones with earpiece jacks. Pressing the TEL button activates the telephone mode.
This connects the telephone to the users as follows:
In ALL intercom mode, all crew and passengers will be heard on the phone when they speak. Com and
other selected radio audio is also heard in the headsets. If the pilot or copilot pushes the radio PTT, their
mic will be transferred to the selected Com radio. The telephone party will not hear ATC communications,
and vice versa.
In CREW mode, only the pilot and copilot are connected to the telephone. Passengers will not hear the
telephone. The pilot and copilot will also have transmit capability on the other selected transceiver.
In ISO intercom mode, when the PMA8000B is in the TEL mode, the pilot position is in the "Phone
Booth." Only the pilot will hear the telephone, and only he will be heard. He will also have access to Com
1 or 2, and will transmit on that radio using the PTT. All selected audio is provided to the pilot.