Search results
Results from the WOW.Com Content Network
Diagram of leaky feeder cable. A leaky feeder is a communications system used in underground mines and inside tunnels. [1] Manufacturers and cabling professionals use the term "radiating cable" [2] [3] [better source needed] [4] as this implies that the cable is designed to radiate: something that a typical coaxial cable is generally not intended to do.
Base feed: Radio frequency power is fed to the mast by a wire attached to it, which comes from a matching network inside the "antenna tuning hut" at right. The brown ceramic insulator at the base keeps the mast electrically insulated from the ground. On the left there is an earthing switch and a spark gap for lightning protection.
Square lattice roof top tower 98 (40 + 58 (building + tower)) [16] Storm [16] The tower on the roof collapsed to street. Two persons were killed. [17] WMBD AM radio tower, Peoria, Illinois, US April 20, 2000: Thunderstorm winds Early morning thunderstorm wind event with estimated damage of $500,000 [18] WRMD-Tower, St. Petersburg, Florida, US ...
A guyed radio mast. A guyed mast is a tall thin vertical structure that depends on guy lines (diagonal tensioned cables attached to the ground or a base) for stability. The mast itself has the compressive strength to support its own weight, but does not have the shear strength to stand unsupported or bear loads.
Series or base feed - This is the most common type, the type discussed above, in which the feedline is connected between the base of the monopole and the ground plane. For the quarter-wave λ / 4 {\displaystyle \lambda /4} monopole and odd harmonics the input impedance is a minimum, 36.8 ohms for a quarter-wave monopole.
The ITU indoor propagation model, also known as ITU model for indoor attenuation, is a radio propagation model that estimates the path loss inside a room or a closed area inside a building delimited by walls of any form. Suitable for appliances designed for indoor use, this model approximates the total path loss an indoor link may experience.
Code enforcement officers cited the property owner three times in 2011, and have issued a brand new batch of citations for the sewage and other building safety issues. Show comments Advertisement
Radio frequency signals used within the computer circuitry may be unintentionally coupled to the power cord or to an interconnecting cable, which then acts as an antenna. A radio receiver will often use an intermediate frequency which is detectable outside the radio—the concept behind at least one audience measurement concept for roadside ...