PS Engineering
PMA8000 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-0000
Page 3-6
Revision 9, June 2005
PMA8000 can serve as a audio control and distribution center. When TEL is active, the button will
illuminate.
In
ALL
intercom mode, all crew and passengers will be heard on the phone when they speak. All will hear
selected audio. Com audio is automatically heard in the headsets.
In
CREW
mode, the pilot and copilot are connected to the telephone. The pilot and copilot will have
transmit capability on the other selected transceiver Com 1 or 2, simply by using their respective PTT
switch.
In
ISO
intercom mode, when the PMA8000 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.
Note: Because the cellphone uses an intercom circuit, all stations on that circuit will lose intercom
capability when the cellphone is in use.
PS Engineering does not guarantee compatibility with personal cellular telephones.
Visit
www.ps-engineering.com
for a list of phones that have been tested.
3.8
Marker Beacon Operation (10)
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 audio from the Marker Beacon Receiver can be heard by selecting the "MKR" push-button switch. To
adjust the volume level, there is a service adjustment located on the top of the unit.
A pushbutton is used to set the receiver sensitivity and to test the indicator lamps. Use "
HI
" sensitivity ini-
tially. This allows you to hear the outer marker beacon about a mile out. Then touch the smaller MKR but-
ton 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, labeled "T/M" and illumi-
nates all three lamps simultaneously to assure the lamps (internal and external) are in working order. TST
does not activate MM autopilot sense output. Releasing the button returns to the last sensitivity.
Pressing the marker mode select (to “T/M”) for two seconds will also cause the marker audio to mute for
that beacon. The next beacon received will re-activate the audio.
3.9
Internal Recorder System (Option 1)
The Intercom Recording System is a digital recording system allowing automatic storage and playback of
aircraft radio traffic.
Operating as a continuous loop recorder, (first message received will be the last heard), the recorder has
one minute of recording time or up to 16 messages. With its own built in VOX circuit, there are no buttons
to press to start recording. The system automatically begins to record the instant the radio becomes active.
Only aircraft radio audio in pilot’s headset is recorded and only the pilot will hear the playback audio.
3.10 Operation
Recording is automatic. To play back the last recorded message, simply press the switch associated with
the IRS. Each additional press of the button will play the preceding recorded message. You must wait for
the message to finish playing before accessing the prior message. To cancel the playback, press and hold
the playback button for two seconds. The next time the button is pressed, the next earlier message will be
heard.
