PS Engineering MB-10 Installation Manual - Manual (Page 9)

PS Engineering
MB10 Marker Beacon Receiver and Indicator System
Installation and Operator’s Manual
200-023-0001 Page 3-1 Rev. 9, Sept. 2013
Section III OPERATION
GENERAL INFORMATION
3.1 SCOPE
This section provides detailed operating instructions for the PS Engineering MB10, Marker Beacon sys-
tem. Please read it carefully before using the MB10 so that you can take full advantage of its capabilities.
Figure 3-1 MB10 front panel
3.2 Power
Unit power is on whenever the avionics bus is energized.
3.3 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. To
adjust the volume level, there is a service adjustment located on the top of the unit.
A toggle switch is used to set the receiver sensitivity and to test the indicator lamps. Use "HI" sensitivity
initially. This allows you to hear the outer marker beacon about a mile out. Then switch into Low Sensi-
tivity mode. “LO” sensitivity gives you a more accurate location of the Outer Marker. Holding the MKR
switch down for two seconds 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. Releasing the button returns to the low sensitivity.
Pressing the marker mode select (to “T/M”) for two seconds will also cause the marker audio to mute for
that beacon. The next beacon received will re-activate the audio.