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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.
Both kites had two bridle attachment points, one for winds 7–20 miles per hour, the other for 15–40 miles per hour. The SCR-578 and AN/CRT-3 also included a small balloon and hydrogen generator to raise the antenna if there was no wind, however, because the hydrogen generator was caustic and the hydrogen flammable, the kite was the ...
Height above average terrain (HAAT), or (less popularly) effective height above average terrain (EHAAT), is the vertical position of an antenna site above the surrounding landscape. HAAT is used extensively in FM radio and television , as it is more important than effective radiated power (ERP) in determining the range of broadcasts ( VHF and ...
How does the signal get from the horizon of the first (say 8 miles) and arrive 10 miles farther at the second atennna? --Crossmr 16:09, 18 April 2006 (UTC) Because the top of antenna A can just barely see over the edge of the Earth that the tip of antenna B is showing. It cannot see the base of B. Both heights are needed.
A telescope composed of stations each with 256 crossed-dipole antennas operated by the University of New Mexico and the Naval Research Laboratory. The first station (LWA1) is 50 miles west of Socorro, colocated with the VLA. The second station is at the Sevilleta National Wildlife Refuge 20 miles north of Socorro. Additional stations are planned.
In telecommunications, the effective height of an antenna is the height of the antenna's center of radiation above the ground. In low- frequency applications involving loaded or nonloaded vertical antennas, the effective height is the moment of the current distribution in the vertical section, divided by the input current.
Very high frequency (VHF) is the ITU designation [1] [2] [3] for the range of radio frequency electromagnetic waves (radio waves) from 30 to 300 megahertz (MHz), with corresponding wavelengths of ten meters to one meter.
The array is centered on a ground screen 1,443 feet (439.8 m) in diameter. The arrangement permits accurate direction finding of signals from up to 4000 nautical miles (7408 km) away. AN/FLR-9 antenna array at Misawa Air Base c. 1980. FLR-9s were constructed at the following places: [3] USASA Field Station Augsburg (Gablingen Kaserne), Germany
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