PS Engineering PMA7000CD Installation Manual - Manual (Page 22)

PS Engineering
PMA7000CD Audio Selector Panel and Intercom System
With PCD7100-R Remote Compact Disc Player
Installation and Operator’s Manual
200-790-0010 Page 3-2 Revision 10, September 2005
The PMA7000CD-Series has an automatic selector mode. Audio from the selected transceiver is automati-
cally heard in the headsets and speaker (if selected). You can check this function by switching from C
OM 1
to C OM 2 and watch the selected audio light on the selector change from COM 1 to COM 2. This ensures
the pilot will always hear the audio from the transceiver he is transmitting on.
When switching from C OM 1 to C OM 2, while C OM 2 audio had been selected, Com 1 audio will continue
to be heard. This eliminates the pilot having to switch Com 1 audio back on, if desired.
When switching from C OM 1 to C OM 2 while Com 2 has NOT been selected, Com 1 audio will be switched
off. In essence, switching the mic selector will not effect the selection of Com receiver audio.
When the duplex, or TELEPHONE mode is implemented, Com 3 becomes the “TEL” position . This is the
pilot’s “hook” switch, when the system is interfaced to an appropriate approved wireless telecommunica-
tion system, such as the AirCell system. Placing the mic selector in Com 3 places the pilot microphone and
headphones on the cellphone. The pilot PTT will switch the pilot mic to the other selected com transceiver,
and allow continued aircraft communications as well.
The copilot will also be able to transmit with his PTT as well.
NOTE: Placing the mic selector switch in the COM 3 –TEL– mode will disable pilot and copilot intercom,
as the intercom circuit is transferred to the telephone use. In crew or ISO mode, placing the switch in TEL
mode removes the passengers access to the telephone.
3.3.1 Swap Mode (Switch from Com 1 to Com 2 remotely)
With a yoke mounted, momentary switch, the pilot can change from the current Com transceiver 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. .
3.4 Audio Selector (All models)
Receiver audio is selected through seven momentary, push-button, backlit switches. You will always hear
the audio from the transceiver that is selected for transmit.
The users can identify which receivers are selected by noting which of the green switch LEDs are illumi-
nated. Push buttons labeled Nav 1, Nav 2, MKR (Marker), AUX (auxiliary), and SPR (Speaker) are "mo-
mentary type switches. When one of these buttons is pressed, be active, and the LED will illuminate. Press
the switch again and it be in the "off" position and remove that receiver from the audio.
If the aircraft is equipped with a DME or ADF, these audio sources can be selected with the AUX button.
3.4.1 Speaker Amplifier
The "SPR" in the push-button section stands for speaker. This switch will place all selected audio on the
cockpit speaker when this switch is selected. NOTE: Except for the unswitched audio, the speaker ampli-
fier is not active in the "Split Mode."
Unswitched audio, (autopilot disconnect, altimeter warning, etc.) will come through the speaker regardless
of the speaker button position.
3.4.1.1 Public Address Function
To access PA function, a switch is installed to connect the top connector, pin 18, to ground. This places the
pilot microphone on the speaker output (Pin W) when the PTT is pushed. The copilot can continue to use
the selected com radio.
We recommend that the switch transfer the audio from the cockpit speaker to a cabin speaker for public
address. This will prevent feedback.