PS Engineering PMA8000D Pilot’s Guide - Manual (Page 6)

Page 6 202-890-0304 Rev. 2 PMA8000D Pilot Guide
Marker Beacon Operation (9)
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 pushing the
"MKR" push-button switch momentarily.
A marker AUD LED will indicate the marker beacon audio has been se-
lected.
To adjust the volume level, there is a service adjustment located on the top
of the unit.
The Marker Sensitivity is controlled by an external switch, labeled MKR HI
sense. Of switched to ground, the marker receiver is in high sensitivity, oth-
erwise, the marker is in LOW sense by default, and the “LOW” indicator on
the audio panel is illuminated.
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. T/M does not activate MM auto-
pilot 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 received will re-
activate the audio.
Bluetooth ® Telephone
In a dual PMA8000D Installation, the pilot’s Bluetooth transceiver services
music and telephone for the pilot only. It is not possible to share the phone
connected to the pilot’s audio panel. If the pilot’s cell phone does not pro-
vide sidetone on the Bluetooth connection, the pilot will not hear himself on
the telephone.
When the pilot connects to the Telephone, the audio panel must be in ISO
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