PS Engineering PMA8000SR Pilot’s Guide - Manual (Page 13)

202-880-0000 Page 13 R5 PMA8000-SR Pilot Guide
The Amber lamp, labeled "M”, is the Middle Marker lamp and is cou-
pled 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 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 illuminates all three
lamps simultaneously to assure the lamps (internal and external) are in
working order. TST does not activate MM autopilot sense output. Re-
leasing 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 received will
re-activate the audio.
Optional 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.
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.