ILS Marker Beacon

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ILS Marker Beacon
800px-LOM Waterfallthmb.png
Frequencies 75 MHzMegaHertz (MHz) 10^6 Hz75,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
75,000 kHzKiloHertz (kHz) 10^3 Hz
75,000 kHzKiloHertz (kHz) 10^3 Hz
75 MHzMegaHertz (MHz) 10^6 Hz
75,000 kHzKiloHertz (kHz) 10^3 Hz
75 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range 75 MHzMegaHertz (MHz) 10^6 Hz75,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
75,000 kHzKiloHertz (kHz) 10^3 Hz
- 75 MHzMegaHertz (MHz) 10^6 Hz75,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
75,000 kHzKiloHertz (kHz) 10^3 Hz
Mode AMAmplitude Modulation
Modulation OOKOn-Off Keying Modulation
ACFAutoCorrelation Function
Bandwidth 3 kHzKiloHertz (kHz) 10^3 Hz3,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
0.003 MHzMegaHertz (MHz) 10^6 Hz
kHzKiloHertz (kHz) 10^3 Hz
0.003 MHzMegaHertz (MHz) 10^6 Hz
kHzKiloHertz (kHz) 10^3 Hz
0.003 MHzMegaHertz (MHz) 10^6 Hz
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]