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position. The marker beacon receiver receives 75 MHz signals.
Test and Indications
You do a test of the these VOR/MB receiver 1 functions at the
same time:
* VOR function
* MB function.
There is a test switch and two light emitting diodes (LEDs) on
the front panel of the VOR/MB receiver.
Flight Fault Memory
The VOR/MB receiver has a nonvolatile flight fault memory.
Only shop personnel can read the memory.
MARKER BEACON SYSTEM - VOR/MARKER BEACON RECEIVER
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MARKER BEACON SYSTEM - VOR/MARKER BEACON RECEIVER
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General
The marker beacon antenna receives signals from marker
beacon ground stations.
Six screws hold the antenna to the fuselage.
MARKER BEACON SYSTEM - MARKER BEACON ANTENNA
EFFECTIVITY
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MARKER BEACON SYSTEM - MARKER BEACON ANTENNA
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General
When the airplane goes above a marker beacon transmitter,
marker beacon data shows on the primary flight display (PFD).
If you want to hear marker beacon audio, you select the marker
beacon audio on the audio control panel (ACP).
Display Types
OM shows when the airplane goes above the outer marker. The
OM letters are cyan.
MM shows when the airplane goes above the middle marker.
The MM letters are yellow.
IM shows when the airplane goes above the inner marker,
backcourse marker, or an airways marker. The letters IM are
white.
NCD/Fail Display
If marker beacon data fails or is no computed data (NCD), the
display does not show.
Audio General
The ACP supplies control signals to the remote electronics unit
(REU). The REU uses the control signals to select the audio that
goes to the flight interphone speakers and headsets.
Use the ACP to listen to marker beacon audio.
Audio Operation
You make these ACP selections to listen to marker beacon
audio:
* Push the marker beacon receiver volume control to make
the marker beacon audio come on
* Turn the marker beacon receiver volume control to change
the volume level.
Audio Outputs
These are the marker beacon audio outputs:
* Outer marker (OM) is 400 Hz, continuous dashes (- - - -)
* Middle marker (MM) is 1300 Hz, alternate dots and dashes (-
.-.-.-.-)
* Inner marker (IM) is 3000 Hz, continuous dots (......)
* Backcourse marker is 3000 Hz, continuous paired dots (.. .. ..
..)
* Airways marker is 3000 Hz with the morse code. identifier for
that station.
MARKER BEACON SYSTEM - DISPLAYS AND AUDIO OUTPUTS
EFFECTIVITY
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MARKER BEACON SYSTEM - DISPLAYS AND AUDIO OUTPUTS
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Marker Beacon Signal
The marker beacon antenna receives the 75 MHz signal and
sends it to a 75 MHz filter in the VOR/marker beacon (VOR/MB)
receiver 1. This filter tunes and rejects unwanted signals. The
output goes to a radio frequency (RF) amplifier. A detector
receives the amplifier output and sends the demodulated signal
to three bandpass filters.
The bandpass filters are at 400 Hz, 1300 Hz, and 3000 Hz. The
filters send the signals to an audio amplifier and to an input/
output (I/O) card. The audio amplifier sends audio tones to the
REU. The I/O card sends data to the DEU and the flight data
　
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