An umbrella antenna is a capacitively top-loaded wire monopole antenna, consisting in most cases of a mast fed at the ground end, to which a number of...
22 KB (2,481 words) - 14:34, 1 September 2024
height of 270 m (890 ft) 3 umbrella antennas, fixed on 18 guyed lattice masts, height of central masts: 305 metres umbrella antenna, fixed on 13 guyed lattice...
49 KB (3,045 words) - 11:14, 15 August 2024
the dipole antenna or 37.5 ohms. Common types of monopole antenna are whip rubber ducky helical random wire umbrella inverted-L and T-antenna folded unipole...
21 KB (2,176 words) - 17:12, 7 July 2024
Very low frequency (section Dynamic antenna tuning)
and efficiency of the antenna. High-power stations use variations on the umbrella antenna such as the "delta" and "trideco" antennas, or multiwire flattop...
38 KB (3,946 words) - 21:56, 24 September 2024
if the length of the antenna is shorter than 1/4 wavelength. They used grounded or insulated guyed masts with umbrella antennas, or wire-spans across...
22 KB (2,853 words) - 20:49, 29 September 2024
Medium wave (section Antennas)
to ground anchors. Thus the umbrella antenna uses the guy wires as the top-load part of the antenna. In all these antennas the smaller radiation resistance...
21 KB (2,852 words) - 19:35, 16 October 2024
of the site is taken up by the VLF transmitter's large trideco wire umbrella antenna. This consists of a 748 feet (228 m) central mast with 6 vertical wire...
13 KB (1,175 words) - 18:49, 3 October 2023
The Moxon antenna or Moxon rectangle is a simple and mechanically rugged two-element parasitic array, single-frequency antenna. It takes its name from...
6 KB (694 words) - 06:47, 20 August 2024
this antenna in 1946. It is very popular in the United States. The antenna can be erected as horizontal dipole, as sloper, or an inverted-V antenna. With...
5 KB (628 words) - 12:56, 1 August 2023
Low frequency (section Antenna heights)
electrically short antennas need loading coils at the base of the antenna to bring them into resonance. Many antenna types, such as the umbrella antenna and L- and...
21 KB (2,387 words) - 13:00, 9 May 2024