202-890-0202
Page 9
Feb. 2009 PMA8000B Pilot Guide
A pushbutton is used to set the receiver sensitivity and to test the indi-
cator lamps mute the marker audio.
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 one second 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 (“T/M”) for one second will also
cause the marker audio to mute for that beacon. The next beacon re-
ceived will re-activate the audio.
Internal Recorder System
The Intercom Recording System is a digital recording system allow-
ing 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 but-
tons to press to start recording. The system automatically begins to
record the instant the radio becomes active. Only the com radio se-
lected for transmit is recorded, and only the pilot and copilot will hear
the playback audio.
Operation
Recording is automatic. To play
back the last recorded message,
press and hold the COM Receive
pushbutton associated with the
selected radio transmitter for
about one (1) second. You can
either wait for the message to
finish playing before accessing the prior message or cancel the play-
back. To cancel the playback, press and hold the COM Receive play-
back button for two seconds (2). The next time the button is pressed
for one (1) second, the next earlier message will be heard.
The playback will stop whenever there is more incoming selected
com audio, and the message can be replayed from the beginning by
pressing the COM playback button..
