The omnidirectional antenna consisted of a ground-fed 142-metre-tall guyed mast, carrying a double conical cage antenna with a diameter of 64 metres.
42.
An omnidirectional antenna can be used for uplink and downlink, or a medium gain helix antenna can be used ( downlink only ).
43.
Omnidirectional antennas typically try to limit the range of their vertical plane radiation pattern to concentrate energy over a smaller range and increase gain.
44.
In the United States, the Federal Communications Commission ( FCC ) gives most stations automatic program test authority if they are using an omnidirectional antenna.
45.
The radio transmitter aboard Telstar was very low-powered compared to modern communication satellites, with a power of only 14 watts, and transmitted through an omnidirectional antenna.
46.
In November 2007, WBNI replaced the directional antenna on the tower in Roanoke with an omnidirectional antenna, resulting in a better signal in the coverage area.
47.
Since satellite phones tend to have omnidirectional antennas no alignment is required as long as there is a line of sight between the phone and the satellite.
48.
Sold to Cogeco in 1986, it broadcasts on 105.7 MHz with an effective radiated power of 41, 000 watts ( class C1 ) using an omnidirectional antenna.
49.
Sidelobe jamming can be overcome by reducing receiving sidelobes in the radar antenna design and by using an omnidirectional antenna to detect and disregard non-mainlobe signals . polarization.
50.
Thus mounting the loop in a horizontal plane will produce an omnidirectional antenna which is horizontally polarized; mounting the loop vertically yields a weakly directional antenna with vertical polarization.
