ILS Marker Beacon

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ILS Marker Beacon
800px-LOM Waterfallthmb.png
Frequencies 75 MHz
Frequency Range 75 MHz - 75 MHz
Mode AM
Modulation OOK
ACF
Emission Designator
Bandwidth 3 kHz
Location Worldwide
Short Description ILS Marker Beacons are used by aircraft for Instrument Landing Systems, transmitted by an upward-facing directive antenna at known distances along the approach path.
I/Q Raw Recording
Audio Sample

ILS Marker Beacons are used by aircraft for Instrument Landing Systems, transmitted by an upward-facing directive antenna at known distances along the approach path.

There are three types of marker beacon: Outer Marker (400 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). dashes), Middle Marker (1020 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). dot-dashes), Inner Marker (3000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). dots). The latter is installed only in ILSs having decision heights of less than 200 feet (60 m).

If the Outer Marker is combined with a NDB (Non Directional Beacon), the two make a "Locator Outer Marker", or LOM. They trigger a three-lights indicator and a togglable aural warning in the cockpit when the aircraft flies directly over them.

Audio Sample[edit]

(Outer Marker)

Frequencies[edit]

75 MHzMegaHertz (MHz) 10^6 Hz

Decoding Software[edit]

Video Examples[edit]

Additional Links[edit]