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Radio beacons: Difference between revisions
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Often the [[VOR-DME]] part of the [[TACAN]] is also made available for civilian navigation. If so, the beacon is called a '''VORTAC''', but the use is as a normal [[VOR-DME]], in the normal frequency range. The range of the beacon varies. Most have the same range as a [[VOR-DME]] but many will have different ranges. | Often the [[VOR-DME]] part of the [[TACAN]] is also made available for civilian navigation. If so, the beacon is called a '''VORTAC''', but the use is as a normal [[VOR-DME]], in the normal frequency range. The range of the beacon varies. Most have the same range as a [[VOR-DME]] but many will have different ranges. | ||
==Marker beacons== | ==Marker beacons== | ||
Runways used to have three horizontal directed radio beacons to aid landing, the [http://en.wikipedia.org/wiki/Marker_beacon marker beacons]. | Runways used to have three horizontal directed radio beacons in-line with the runway to aid landing, the [http://en.wikipedia.org/wiki/Marker_beacon marker beacons]. | ||
# Outer marker - Typically placed at 4 NM from runway | # Outer marker - Typically placed at 4 NM from runway | ||
# Middle marker - Typically placed at 3500 feet from the runway | # Middle marker - Typically placed at 3500 feet from the runway | ||
# Inner marker - Typically placed at 1000 feet from runway | # Inner marker - Typically placed at 1000 feet from runway | ||
Distance from runway varies a lot. On many airfields the markers have been replaced with an [[ILS]] and/or [[VOR-DME]]. The outer marker is sometimes combined with a [[NDB]]. | Distance from runway varies a lot. On many airfields the markers have been replaced with an [[ILS]] and/or [[VOR-DME]]. The outer marker is sometimes combined with a [[NDB]]. | ||
==Further reading== | ==Further reading== | ||
[[Radio navigation]] | [[Radio navigation]] | ||