PS Engineering PMA9000EX Installation Manual - Manual (Page 22)

PS Engineering
PMA9000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-920-0000 Page 3-1 Rev. 9, Jan. 2011
3.4 COM Audio Selector (3)
Communication audio from the other radio, not selected for transmit, can
be heard by pressing the associated RCV button. You will always hear the
audio from the selected transceiver.
In SPLIT mode, only the pilot will hear selected navigation audio.
3.5 Navaid Audio selection (4)
VHF Navigation receiver audio is selected through two momentary, push -
button, backlit switches.
The users can identify which receivers are selected by noting which green
LEDs are lit above the button. Navigation aid audio push buttons are labeled N1, N2.
The MKR (Marker), ADF AUX (auxiliary) and DME audio is available when selected through the
ECAPS graphical and data control system.
3.6 Marker Beacon Operation (5)
The Marker Beacon Receiver uses visual and audio indicators to alert
you when the aircraft passes over a 75 MHz transmitter.
The Blue lamp, labeled “O”, is the Outer Marker lamp and has an
associated 400-Hertz 'dash' tone. The lamp and tone will be keyed at
a rate of two tones/flashes per second when the aircraft is in the range of the Outer Marker Beacon.
The Amber lamp, labeled “M”, is the Middle Marker lamp and is coupled with a 1300 Hertz tone. It is
keyed alternately with short 'dot' and long 'dash' bursts at 95 combinations per minute.
The White lamp, labeled “I”, is the Inner marker and has a 3000 Hertz 'dot' tone. The lamp and tone will
be keyed at a rate of six times per second.
The MKR button controls audio selection, marker sensitivity, and audio muting, and lamp test.
 MKR button press of < 1 second: toggles between high and low receiver sense
 MKR button press between 1 and 2 seconds: Activates audio mute, and marker lamp test acti-
vated. The next beacon received will re-activate the audio.
 MKR button press > 2 seconds: toggle marker audio on/off. The marker audio can also be se-
lected from the display menu
To adjust the volume level, there is a service adjustment located on the top of the unit.
Use "HI" sensitivity initially. This allows you to hear the outer marker beacon about a mile out. Then
touch the smaller MKR button to switch into Low Sensitivity mode. “LO” sensitivity gives you a more
accurate location of the Outer Marker.
Holding the MKR button for two seconds activates marker test lamp, which illuminates all three lamps
simultaneously to assure the lamps (internal and external) are in working order. TST does not act ivate
MM autopilot sense output. Releasing the button returns to the last sensitivity.
3.7 Intercom Operation (6)
3.7.1 IntelliVox® VOX-Squelch
No adjustment of the IntelliVox® squelch control is necessary. There is no field adjustment. Through
three individual signal processors, the ambient noise appearing in all six microphones is constantly being
sampled. Non-voice signals are blocked. When someone speaks, only their microphone circuit opens,
placing their voice on the intercom.