Back in the early eighties there was an interesting verticle in QST that was
a multiple band homebrew vertical that consisted of small-dimension 1/4 wave
elements that were bolted to sections of 4"or 6" PVC rings. One vertical
for each band. That provided a no-tuner-needed vertical that, of course, was
dependent upon the ground system, I saw one in use at the school radio
station in Costa Rica - it was mounted in the steel roof of the gym - nice
ground plane! The beauty of that design is that it provides structural
integrity from small diameter elements and, in theory any and all bands
could be included with one feed-line.
Now, staying with the same sort of concept, Gonset made an interesting beam
that had elements consisting of tubes, thin-walled tubes, inside of each
other all grounded at the beam end of the element. The 10 meter tube was
the largest diameter and the 20 meter the smallest diameter with 15 meters
in between. A friend lent me one of those beams and my
first-anxious-to-get-on-the-air attempt was to use one of those elements as
a vertical. The ground system was the steel roof structure. It worked like
a charm - that was in Guayaquil Ecuador. BTW one I had the three element
Gonset up it was a real performer - no traps.
Oh, the Gonset used a series of rubber grommets to keep the three tubes
separate from each other and the end of the 20 meter element was adjustable.
Yes, I would go or the DX engineering radial plate and also a similar tip
over post.
73,
Kris KM2KM
Merschrod
123 Warren Road
Ithaca, NY 14850
www.merschrod.net
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