PS Engineering PMA8000B X - Manual (Page 9)

202-890-0202 Page 9 June 2008 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 30 seconds 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 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 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 (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.