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A mast radiator or mast antenna is a radio tower or mast in which the whole structure is an antenna. Mast antennas are the transmitting antennas typical for long or medium wave broadcasting. Structurally, the only difference is that some mast radiators require the mast base to be insulated from the ground.
A mast radiator (or radiating tower) is a radio mast or tower in which the metal structure itself is energized and functions as an antenna. This design, first used widely in the 1930s, is commonly used for transmitting antennas operating at low frequencies , in the LF and MF bands, in particular those used for AM radio broadcasting stations.
The diamond-shaped tower was patented by Nicholas Gerten and Ralph Jenner for Blaw-Knox July 29, 1930. [5] and was one of the first mast radiators.[1] [6] Previous antennas for medium and longwave broadcasting usually consisted of wires strung between masts, but in the Blaw-Knox antenna, as in modern AM broadcasting mast radiators, the metal mast structure functioned as the antenna. [1]
There is also a back-up omni-directional mast radiator for 648 kHz, erected in 1983, which can only handle transmitter powers of up to 250 kW and was used when maintenance work was being carried out on the directional antenna. This mast is now used to transmit Radio Caroline on 648 kHz.
Old mast radiator tower for CFCB New CFCB Mast Radiator tower. On April 2, 2001, the sale of Humber Valley Broadcasting Co. Ltd. to Newcap Inc. was approved. [4] This included a number of radio stations such as: CFCB Corner Brook; CFDL-FM Deer Lake; CFNW Port-aux-Choix; CFNN-FM St. Anthony; CFSX Stephenville; CFGN Port-aux-Basques; CFCV-FM St ...
It consists of three 300-metre (980 ft)-high guyed masts, which are insulated against ground and ground-fed. As a backup a 330-metre (1,080 ft)-high guyed, ground-fed lattice steel mast radiator is available on the site, which only allows an omnidirectional radiation pattern. The grounding system of the long wave transmitter is very large.
Droitwich Masts at the Droitwich transmitting station Droitwich Transmitting Station (Worcestershire) Location Droitwich, Worcestershire Mast height 213.36 metres (700 ft) Coordinates 52°17′48″N 2°06′19″W / 52.296666666667°N 2.1052777777778°W / 52.296666666667; -2.1052777777778 Grid reference SO929663 Built 1934 The Droitwich transmitting station is a large broadcasting ...
The station's current antenna was built in 1972; it consists of two guyed masts, each 458.11 metres (1503 feet) tall, which are configured as umbrella antennas. They are fed by an overhead cable, fixed to a tall mast at one end, and at the opposite end to a smaller grounded mast near the helix building via an insulator.