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→Tips ongrounding your antenna. Placement Tips There are many things that will affect the performance of your antenna, but as a general rule,the higher you can get your antenna, the better. Digital TV signals are transmitted usingUHF and VHFfrequency spectrums. Most channels are broadcast on...
A transmitter and radio antenna tower • A sufficient supply of portable radios to allow all officers to carry one • A sufficient supply of battery chargers for all portable radios • One or more repeaters to reach distances beyond the reach of the portable radios or to reach into build...
These ionospheric effects can sometimes extend well into the VHF TV band though they tend to show the greatest effect at lower frequencies. Effects of Antenna Height With the assumption that ground approximates a large flat surface, an approximation to field strength as a function of antenna ...
To transmit signals, a series of direct digital synthesizers (30) is used to drive the antenna elements forming the phased array. Each direct digital synthesizer is programmed from a common digital processor (34) with specific time and phase delay information such that the signals from the array...
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A digitally beam formed phased array antenna capable of both transmitting and receiving signals is constructed from a series of digitally controlled antenna elements. To transmit signals, a series of direct digital synthesizers (30) is used to drive the antenna elements forming the phased array. Eac...
The roof-mount Antennas Direct 91XG does a great job of pulling in weak TV signals. The Antennas Direct 91XG is a large antenna, designed for reception of medium to very weak signals in the UHF broadcast band, a task it performs very well. The 91XG looks like an old-school antenna an...