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Shortwave "Discone" Antenna, Former AT&T High Seas Radio Transmitter Site, Ocean Gate, NJ, 2009.
(fedia.io)
Shortwave "Discone" Antenna, Former AT&T High Seas Radio Transmitter Site, Ocean Gate, NJ, 2009.
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#photography
@mattblaze@federate.social IT looks like it has three feedpoints, perhaps to direct the beam.
@profdc9@mastodon.social no, just one feedpoint. It’s an omnidirectional antenna. (Most of the cables are antenna elements or guy wires)
@mattblaze@federate.social If you look carefully, it looks like there's three cones flaring up to the ring. So this may not be a conventional discone antenna.
@profdc9@mastodon.social No, it’s a just conventional discone antenna.
@mattblaze@federate.social Where are the radiating elements then? The radiating element is not the ring, its the guy wires, and there must be ground radials.
@profdc9@mastodon.social in this type of antenna, the mast is insulated from the ground. The feedpoint is at the base of the tower, which is the apex of a conical arrangement of wires tgat go from the base to the circumference of the ring at the top (which is itself supported by wires at the top of the mast.) Think of the small UHf/VHF discone antennas mounted on roofs, but turn them upside down. Here, the “disc” is the ground.