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Locator Outer Marker (LOM), a High Frequency (HF) Non-Directional Beacon, co-located with an "outer marker" (OM) 75-MHz Marker Beacon. Middle marker antenna at KONT A marker beacon is a particular type of VHF radio beacon used in aviation , usually in conjunction with an instrument landing system (ILS), to give pilots a means to determine ...
A marker beacon is a specialized beacon used in aviation, in conjunction with an instrument landing system (ILS), to give pilots a means to determine distance to the runway. Marker beacons transmit on the dedicated frequency of 75 MHz. This type of beacon is slowly being phased out, and most new ILS installations have no marker beacons.
One of the wooden poles of NDB HDL at Plankstadt, Germany Ferrite antenna for non-directional beacon (NDB), frequency range 255–526.5 kHz NDBs typically operate in the frequency range from 190 kHz to 535 kHz (although they are allocated frequencies from 190 to 1750 kHz) and transmit a carrier modulated by either 400 or 1020 Hz.
An amateur radio propagation beacon is a radio beacon, whose purpose is the investigation of the propagation of radio signals. Most radio propagation beacons use amateur radio frequencies. They can be found on LF, MF, HF, VHF, UHF, and microwave frequencies. Microwave beacons are also used as signal sources to test and calibrate antennas and ...
The RC-43-A (BC-357) is a UHF receiver which provides a visual indication when flying over a 75-MHz marker beacon. it operates in the frequency of 67 to 80 MHz. The receiver box is located with other radio equipment and lights a lamp on the pilot's instrument panel when over the beacon. the RC-43 is 24 volts, the RC-39 is 12 volts. the unit uses a fixed wire antenna.
By tuning in a radio station and then using a directional antenna, one could determine the direction to the broadcasting antenna. A second measurement using another station was then taken. Using triangulation, the two directions can be plotted on a map where their intersection reveals the location of the navigator.
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This is the result of the loop itself banking with the aircraft and therefore being at a different angle to the beacon. For ease of visualisation, it can be useful to consider a 90° banked turn, with the wings vertical. The bearing of the beacon as seen from the ADF aerial will now be unrelated to the direction of the aircraft to the beacon.