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A less ambitious idea of “broadband antenna” (often called “wideband”) is an antenna that continuously covers the proportionally widest amateur band, that spans 3.5–4.0 MHz (a 14% bandwidth), [b] without requiring an antenna tuner. There are many such designs, but those are not discussed here.
Hexbeam amateur radio antenna. A hexbeam, or hexagonal-beam, is a type of a directional antenna for shortwave, most often used in amateur radio. The name comes from the hexagonal outer shape of the antenna. It may also sometimes be known as a W-antenna, referring to the shape of the driver. The design looks something like an upturned umbrella.
ALLISS allows a broadcaster to change the following shortwave transmission parameters at any time: direction (azimuths from 0 to 360 degrees, rate: ~1 deg / 6 sec), broadcast frequency, and antenna configuration (i.e.: HR 4/4/1 -> HR 6/4/1). All of these transmission mode changes can take effect in as little as 5 minutes.
CBS used shortwave to support its Latin American international network, which consisted of 64 stations located in 18 countries and GE's KGEI opened in San Francisco in 1939, transmitting to Asia. [16] [17] [18] On November 1, 1942, all 14 private U.S. shortwave stations ended commercial operations and were leased to the Voice of America. [19]
Smith's 2002 plans put broadcast antennas (multiple communications dishes) at the top of the building. [88] A revised 90-story, 1,125 feet (342.9 m) plan was unveiled in September 2003 for a building including condominiums, office space, a "condominium hotel", retail stores, and restaurants.
When alternating current flows in a conductor it radiates an electromagnetic wave (radio wave). In multi-element antennas, the fields due to currents in one element induce currents in the other elements. Antennas are self-interacting in this respect; the waves reradiated by the elements superimpose on the original radio signal being studied.
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Modern shortwave radio receivers are relatively inexpensive and easily accessible, and many hobbyists use portable "world band" receivers and built-in telescopic antennas. Serious hobbyists may use expensive (shortwave) communications receivers and outdoor antenna located away from electrical noise sources, such as a dipole made from wire and ...
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