Pilot’s Operating Handbook Section 902
EXTRA 500 PS Engineering PMA8000B(-T)
11 Marker Beacon Operation
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.
A pushbutton is used to set the receiver sensitivity and to test
the indicator lamps mute the marker audio.
Use HIGH
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. LOW sensitivity
gives you a more accurate location of the Outer Marker.
Holding the
MKR button for one second activates marker test
lamp, labeled T/M and illuminates all three lamps
simultaneously to assure the lamps (internal and external) are in
working order.
12 Internal Recorder System
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 60 seconds of recording
time, or up to 8 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 the COM radio selected for transmit is recorded,
and only the pilot and copilot will hear the playback audio.
26. January 2011
902-7
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