PS Engineering PMA6000B - Manual (Page 17)

PS Engineering
PMA6000B Audio Selector Panel and Intercom System
Installation Manual
200-066-0200 Page 3-2 Rev 6, Feb. 2013
3.3 Volume Control (2)
The volume control knob adjusts the loudness of intercom in all headphones, pilot, copilot, and passenger.
It has no effect on selected radio audio or music levels. Many general aviation headsets have a built-in
volume control, so volume can be reduced “locally.”
3.4 Audio Selector (3)
Through the use of ten, push-button, backlit switches, it is possible to select any or all receiver audio.
When selected, a green LED in the button will illuminate indicating which audio source is selected. You
will always hear the audio from the transceiver that is selected by the two push-button mic selector
switches.
The users can identify which receivers are selected by noting which push-button switches are illuminated.
Push buttons labeled Nav l, Nav 2, DME, MKR (Marker), ADF, AUX (auxiliary), and SPR (Speaker)
are momentary type switches. Press the switch again and it will be in the "off" position and remove that
receiver from the audio. While selected, the switch will also be annunciated by an internal LED.
3.5 Transmit selection (4)
To select a radio for transmission, push the lower button in the Com selection section (XMT). Both the
pilot and copilot have transmit capabilities on the selected transceiver. All hear the selected audio if the
intercom is in the A
LL mode. Only the person who presses their Push-To-Talk (PTT), will be heard over
the aircraft radio.
The PMA6000B-Series has an automatic selector mode. Audio from the selected transceiver is automati-
cally heard in the headsets and speaker (when 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 never transmit on a radio that he is not listening to.
When switching the xmt selector 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 de-
sired.
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, changing the transmitter selection will not effect the previous selection of Com
receive audio.