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Moxon antenna for the 20-meter band.The antenna is the faint rectangle of wires held in tension by the bent X-shaped support frame. Moxon antenna for the 2-meter band. The Moxon antenna or Moxon rectangle is a simple and mechanically rugged two-element parasitic array, single-frequency antenna. [1]
Kathrein-Werke KG is a German manufacturer of antenna systems and related electronics. The company was founded in Rosenheim (Upper Bavaria) in 1919 and is still headquartered there. [1] It is the world's oldest and largest antenna manufacturer, valued at about $1.8 billion in 2015. [2]
The 20-meter or 14-MHz amateur radio band is a portion of the shortwave radio spectrum, comprising frequencies stretching from 14.000 MHz to 14.350 MHz. [1] The 20-meter band is widely considered among the best for long-distance communication ( DXing ), and is one of the most popular—and crowded—during contests . [ 2 ]
The company was one of the earliest pioneers of community antenna television systems (cable television). The company headquarters was located at 401 Walnut Street in Philadelphia, Pennsylvania. Shapp sold the company to General Instrument in 1967. However, the Jerrold brand name continued to be used on equipment into the 1990s. [citation needed]
They use large parabolic (dish) antennas up to 500 meters (2,000 ft) in diameter to collect enough radio wave energy to study. The RF front end electronics of the receiver is often cooled by liquid nitrogen to reduce thermal noise. Multiple antennas are often linked together in arrays which function as a single antenna, to increase collecting ...
The AN/PRC-152 radio began production in 2005. [4] Since then, over 100,000 have been provided to the US military. [5] The PRC-152 has been notably used by Prince Harry during his service with the British Army, then a 23-year-old second lieutenant in the Household Cavalry.
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The 15-meter band (also called the 21-MHz band or 15 meters) is an amateur radio frequency band spanning the shortwave spectrum from 21 to 21.45 MHz. The band is suitable for amateur long-distance communications , and such use is permitted in nearly all countries.
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