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The current distribution on the mast determines the radiation pattern. The radio frequency current flows up the mast and reflects from the top, and the direct and reflected current interfere, creating an approximately sinusoidal standing wave on the mast with a node (point of zero current) at the top and a maxima one quarter wavelength down [6] [8]
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.
Masts of RKS Liblice 2 as viewed from a distance. Close-up view of the masts of the towers. The RKS Liblice 2 are two 355 m (1,165 ft) tall guyed masts located east of Prague near Liblice, in close proximity of the RKS Liblice 1. These lattice steel towers are built 120 m (390 ft) apart from each other, what formed a slightly directional ...
Mont Agel Broadcasting Mast 1946 France Fontbonne 145 m originally mast radiator with lattice tower as basement, today used for FM-/TV-broadcasting [6] Waldenburg TV Tower? Germany: Waldenburg 145 m antenna mast dismantled in 2009 Mekhzavod Radio Mast ? Russia Mekhzavod 142 m Mast radiator on small lattice tower [7] Sendeturm Jauerling: 1958 ...
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]
To achieve this, a new 120 metre tall ground-fed guyed lattice steel mast radiator was built northwestwards of the old 120 metre mast at 47°47'11 N and 9°31'12" E. After its completion, the new mast worked as radiator, while the old mast got a reflector. The old 80 metre tall reflector mast, which became obsolete, was dismantled.
A tower array is an arrangement of multiple radio towers which are mast radiators in a phased array. [1] They were originally developed as ground-based tracking radars. [2] Tower arrays can consist of free-standing or guyed towers or a mix of them. Tower arrays are used to constitute a directional antenna of a mediumwave or longwave radio station.
This type of radiation was not possible with the aerial on the wood framework tower and a directional aerial consisting of two insulated guyed radio masts with a height of 94 metres had to be built. [9] [10] [11] This aerial was until 1969 for transmitting the program of the Bavarian broadcasting company during nighttime in service.