MARKER BEACON SYSTEM -VOR/MARKER BEACON RECEIVER
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MARKER BEACON SYSTEM -MARKER BEACON ANTENNA
General
The marker beacon antenna receives signals from marker beacon ground stations.
Six screws hold the antenna to the fuselage.
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MARKER BEACON SYSTEM -MARKER BEACON ANTENNA
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MARKER BEACON SYSTEM -DISPLAYS AUDIO OUTPUTS
General
When the airplane passes over a marker beacon transmitter, marker beacon data shows on the primary flight display (PFD).
If you want to listen to marker beacon audio, select the marker beacon audio on the audio control panel (ACP).
Display Types
OM shows when the airplane passes over the outer marker. The OM letters and the circle around them are cyan.
MM shows when the airplane passes over the middle marker. The MM letters and the circle around them are amber.
IM shows when the airplane passes over the inner marker, backcourse marker, or an airways marker. The letters IM and the circle around them are white.
Audio General
The audio control panel (ACP) supplies control signals to the audio management unit (AMU). The AMU 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
To listen to marker beacon audio signals:
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Select marker beacon audio with the approach receiver selector
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Push the approach receiver volume control to make the marker beacon audio come on
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Turn the approach receiver volume control to change the volume level.
Audio Outputs
These are the marker beacon audio outputs:
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Outer marker (OM) is 400 Hz, continuous dashes (----)
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Middle marker (MM) is 1300 Hz, alternate dots and dashes (-.-.-.-.-)
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Inner marker (IM) is 3000 Hz, continuous dots (......)
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Backcourse marker is 3000 Hz, continuous paired dots (.. .. .. ..)
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Airways marker is 3000 Hz with the Morse code identifier for that station.
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MARKER BEACON SYSTEM -DISPLAYS AUDIO OUTPUTS
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777 AIRCRAFT MAINTENANCE MANUAL
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MARKER BEACON SYSTEM -FUNCTIONAL DESCRIPTION
Marker Beacon Signal
The marker beacon antenna receives the 75 MHz signal and sends it to a 75 MHz filter in the left VOR/marker beacon (VOR/ MB) receiver. 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 audio management unit (AMU). The I/O card sends data to the primary display system function (PDSF) and central maintenance computing function (CMCF) in the AIMS cabinets.
The AIMS PDSF shows marker beacon displays on the PFDs.
Program Pins
A marker beacon (MB) program pin enables the marker beacon functions in the left VOR/MB receiver. A discrete monitor enables the marker beacon function when an open is present on the program pin.
A source/destination indicator (SDI) program pin identifies the VOR/MB receiver as left or right. The VOR/MB receiver sends this information to the AIMS cabinets.
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Monitor and Test
The test switch starts a test of the VOR/MB receiver. The built-in test equipment (BITE) circuits do a test of the VOR/MB receiver. The results of the test show on the light emitting diodes (LEDs), the primary flight display (PFD), and through the flight interphone speakers and headsets.
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