Those who have heard my 80/40/WARC signals may be aware that I am
using an insulated tower vertical (photo on qrz.com).
This antenna on 40m is a 1/2-wave vertical. Estimates of feedpoint
impedance are in the 2000 ohm range, but I feed it with 50-ohm coax.
There is also a 40m 1/4-wave vertical available for use on that band.
Both verticals have 60 1/4-wavelength radials spaced equally about
them. (on the ground).
Comparisons are interesting, depending on DX distance.
From here in Michigan to the Caribbean, the 40m vertical seems a bit
better (one s-unit in most cases), but for JA and YB, the difference
is quite astounding! While the 40m vertical 'hears' those areas quite
well, there is a 5 S-unit difference in favor of the 80m vertical! My
concept of this difference is 'take-off angle'.
I have NO IDEA why it works so well with that 40:1 feedpoint SWR, but
I will never complain.
73
Don
N8DE
On 4/5/2013 6:56 PM, John G. wrote:
How do the "radialless" verticals, like the R5, R7000, MA5V, Gap
ones, compare in performance to the standard 1/4 wave verticals
that are roof mounted with radials? Does one tend to outperform
the other? I am looking how each performs for DXing and longer
haul communications.
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