One form for the VHF antenna is the dipole antenna, sometimes referred to asbunny earsorrabbit ears, designed for indoor use. It is also found combined with a UHF loop. On the other hand, theYagi antenna, which originated in Japan — also called aor aUda-Yagi antennain order to include ...
For HF the propagation modes mean that signals of either polarisation may be used. There are some studies that indicate that horizontally polarised low angle radiation is better for long distance communications if the antenna can provide a sufficiently low angle of radiation, i.e. a vertical anten...
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The dipole antenna is the balanced antenna. Hence, it is necessary to use a balanced feeder. A balanced feeder consists of two parallel conductors. The currents flowing in both theconductorsare equal in magnitude but opposite directions. Hence, the radiating field from them cancels out and nopow...
For use with RF antennas, baluns are needed where a balanced antenna such as a dipole is used. The most convenient form of feeder to use is coaxial cable as this can be routed far more conveniently along antenna towers, or poles, along the ground and through buildings, etc without the ...
A light nanosecond — the distance light travels in a billionth of a second — is about 1 foot (about 30 centimeters). Radar uses this fact to measure how far away something like an airplane is. A radar antenna sends out a short radio pulse and then waits for it to echo off an airpl...
A. Make a radiotelephone call to a coast station. B. Initiate an ARQ call to demonstrate that the transmitter and antenna are working. C. Initiate an FEC call to demonstrate that the transmitter and antenna are working. D. Initiate an ARQ call to a Coast Station and wait for the a...
In addition to other factors including antenna size and spectral efficiency, high-frequency radars’ shorter wavelengths mean they can go through more cycles in a given period , contributing to a broader operating bandwidth. Radars that operate in this range are best known for fire control...
Transmitting a beam at this angle requires enormous antenna arrays and highly reflective ground along the path through which the signal is being sent. This is done by installing wire mesh mats extending up to 3 kilometers (1.9 mi) in front of the antenna. Real-time monitoring of atmospheric ...
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