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Antena „Long Wire” (LW) jest rzeczywiście najprostszą anteną wielopasmową o niekrytycznych wymiarach. Aby używać jej z powodzeniem trzeba jednak zadbać o uziemienie i dopasowanie. Budowa anteny LW. „Long Wire” (LW) to antena utworzona przez pojedynczy przewód zawieszony w wolnej przestrzeni, dołączony
Four variation of a random wire antenna with a length of 18.7 mtr. The graph in Figure 7 has been produced with data generated from 4NEC2 antenna modelling software for an antenna wire of 18.7mtr total length installed at an angle of 30 degrees over a selection of ground types.
The antenna wire is 90' "L"-shaped length of wire. 30' vertical and 60' horizontal is optimum. But almost any other combination will work. Do your best at keeping the vertical portion near 30'.
All you need for a random wire antenna is some wire, your tuner, one or more supports up as high as you can get them to string the wire from the supports to the tuner, at least one or two insulators and a little time.
The "Best" Random Wire Antenna Lengths. Random wire lengths you should and should not use! Jack, VE3EED - SK. Updated 07-08-2013.
Antenna length based on the following formulars: 1/2 λ dipole (feet)= 468 / frequency in Mhz. 1/2 λ dipole (meters) = 142.65 / frequency in Mhz: Full wave loop (feet) = 1005 / frequency in Mhz: Full wave loop (meters) = 306.32 / frequency in Mhz: Cut wire slightly longer for connecting insulators and pruning.
This section contains three tables that can calculate antenna shortening factors and antenna lengths, including quarter-wave verticals over perfect ground, half-wavelength dipoles in free space, and long wire vertical and horizontal antennas.
