On Fri, 2009-01-30 at 11:11 -0500, Bwana Bob wrote:
> Yes, The G5RV is optimized only for 20 meters, where it is a 3/2
> wavelength. The 30 feet of twin lead is a matching section cut for 20
> meters. At the end of the twin lead on all other bands the swr will be
> high. Th secret to the wide bandwidth and low swr on all bands that
> some claim is the fact that most G5RV designs specify 70 feet of coax
> connected to the twin lead. The resulting high losses in the coax due to
> normal loss plus high swr has the effect of smoothing out the swr.
The particular article requested talks only about the 3/2 wave antenna
for 20m. It says little or nothing about use on other bands. Fact is
(from that article) that there have been many G5RV designs because he
made many designs.
>
> Years ago I used a G5RV rigged as an inverted V (not the best
> configuration, but the only way it would fit in the back yard). It
> worked OK on 80, 40 and 20, but was terrible on 15 and 10. On 10
> meters, a dipole in the attic out performed it. I took it down when I
> discovered that a simple 1/4 wave inverted L was better on 80.
>
> Check out Walt Maxwell's (W2DU) site. It has a good discussion of the
> G5RV vs the merits of a dipole with twin lead, window line, or ladder
> line running to the shack.
>
>
> 73,
>
> Bob WB2VUF
73, Jerry, K0CQ
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