On Jun 4, 2010, at 3:32 PM, Hank Greeb wrote:
>
> I have a full size 3 element, 20 metre yagi, which I inherited from a
> silent Key for the effort of taking it down, along with a windmill tower
> and very heavy radar rotor.
>
> If I were to put it up someplace on my very modest antenna farm, could I
> still qualify as a Tribander/wires category?
Not if you used it.
> Or, if I put up a W8JK fixed wire beam for 20/15/10, would it disqualify
> me as from the Triband/wires category because it CAN work on 17 and 12
> metres?
Not any more than using a Cushcraft MA5B would.
> A W8JK beam would be easiest - I could point it toward Europe and hope
> to work a bit more from there. As is, it was pretty slim pickings to
> Europe with my 80 metre dipole fed with ladder line.
>
> Also, I'm thinking of putting up a full wave loop on 80 metres at about
> 35 to 40' high. Would this be considered a multi-element antenna if I
> used it on 40 metres? How about 20/15/10?
No.
> I haven't bothered to
> research the directivity of a multi-wave loop, but I do remember vaguely
> that one gets directivity and gain, and the radiation angle gets lower
> as the length of the loop in wavelengths increases. I think I read
> somewhere that a "V" beam or a Rhombic would NOT be considered for the
> "Wires" category. which seems logical because one can get quite a big of
> gain from a muti-wavelength v-beam or Rhombic. Of course the horizontal
> beam width of a Rhombic gets very sharp when the length gets very long,
> so there's a big tradeoff.
>
> I see that most of the QRPers don't claim TB-Wires, so I'd like to stay
> in that category for future efforts.
It's not Tribander-Wires, it is Tribander and Single Element Antennas.
If you actually had a Rhombic to use on 40, 80 and 160m, it's possible that you
could. After all, Rhombics and V-beams have single elements. (eg no more than a
dipole.
It is an oddity in the rules that these antennas would qualify, but an OWA
antenna for 80/75m would not, since it would have more than one element.
Practically speaking, though, we all know what a TS installation is -- because
there are many, many hams sporting just this sort of installation.
Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901
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