We briefly covered the ILS system and its components. This localizer emits two different radio frequencies, one to the left of the runway at 150Hz. The carrier oscillation in the localizer frequency range is 108.00 MHz to 111. Here is a picture of a localizer antenna at the end of a runway. To conclude, I must add that markers are mainly for position indication and they can be combined with the other improved systems/navigation aids like DME (distance measuring equipment) or NDB (non-directional beacon) to improve the precision. The localizer signal The modulation type of all ILS transmitters is the good old amplitude modulation (AM). Outer marker can be located up to 7500 meters on the approach side of active runway threshold and signals a blue light indication where Middle marker can be located up to 1200 meters and signals an amber light and finally, Inner marker can be located up to 400 meters and signals a white light. Generally, there are middle and outer markers for an ILS but sometimes there can be an additional inner marker.Īll marker beacons are a type of VHF (very high frequency) radio beacons. The LOC frequencies range between 108.10 MHz and 111.95 MHz (with the. Markers are position indication components of an ILS. A Localizer (LOC) which provides the horizontal deviation with respect to the runway axis.
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