ILS Marker Beacon
 | |
|---|---|
| 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]
- Locator Outer Marker (LOM) Aircraft Navigation Beacon
- Outer VHF Marker Beacon
- Middle VHF Marker Beacon
- Inner VHF Marker
