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The original system consisted of the antenna pole in two 98 inches (2,500 mm) lengths. These joined at the top of the protective pyramidal tent. The turntable sat on the ground and the pole was placed in it. The antennas were attached to the upper pole on two cross-arms with the antennas at the end of the arms.
The antenna's feed point is at the center of the disc. It is usually fed with 50-ohm coaxial cable, with the center conductor connected to the disc, and the outer conductor to the cone. The cone: The length of the cone should be a quarter wavelength of the antenna's lowest operating frequency. [2] The cone angle is generally from 25 to 40 degrees.
A short antenna pole next to a house Multiple Yagi TV aerials. Antennas are commonly placed on rooftops and sometimes in attics. Placing an antenna indoors significantly attenuates the level of the available signal. [19] [20] Directional antennas must be pointed at the transmitter they are receiving; in most cases great accuracy is not needed ...
AN/FLR-9 in Elmendorf, Alaska c. 1964. The AN/FLR-9 is a type of very large circularly disposed antenna array, built at eight locations during the Cold War for HF/DF direction finding of high priority targets.
A helical antenna is an antenna consisting of one or more conducting wires wound in the form of a helix.A helical antenna made of one helical wire, the most common type, is called monofilar, while antennas with two or four wires in a helix are called bifilar, or quadrifilar, respectively.
The AN/PRC-10 is an American VHF portable radio transceiver, introduced in 1951 [1] as a replacement for the wartime SCR-300 set. The AN/PRC-8 and AN/PRC-9 sets are basically the same but cover lower frequency bands. It remained in service with the American military until the mid 1960s when it was replaced by the transistorized AN/PRC-25 set.
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Guyed steel lattice mast 538 Replacement tower completed September 15, 2005. Nebraska Education Tower Atlanta, Atlanta, Nebraska, US November 25, 2005: Guyed steel lattice mast 325 Aircraft collision All three aircraft occupants killed KLTV-TV Mast, Tyler, TX (Red Springs, TX) February 3, 2006: Guyed steel lattice mast 329 Undetermined 1078 ...
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