I use a 39 feet long piece of wire strung from a tree, with two 29 feet
capacitance loading at the top extended outwards. It hangs from a tree,
and the legs of each "t" portion is out 29 feet from the base. I have
approximately 10 radials of random lengths in random orientation. This
works acceptably well, and was cheap to make - about $7. While it is likely
not to be optimum performance and will in no measure beat an 80M yagi or a
four square, it performs as well as I can expect with lousy soil in
suburbia.
Scott aka KB0FHP
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of atrampler@att.net
Sent: Wednesday, April 01, 2009 8:47 AM
To: towertalk@contesting.com
Subject: [TowerTalk] 80/160 vertical
OK...slightly off-topic...so perhaps reply off-list.
My summer project for a small lot is an 80/160 vertical, using linear
loading on 160. Think the G0BZF 40/80 vertical.
Initial plan is for 60' radiator, probably 2" OD the whole way to support
the insulators to hold the linear loading (though that really only needs to
be up to about 40') and having some top loading, perhaps 10' wires on each
of the four top guys.
Obviously I'll need some capacitance on 80. Not sure if I'll manually or
remote switch the linear loading in and out.
My main questions surround materials...do I need 1/8" or .104" all the way
(splicec with tubing inside) or am I better off with thin wall tubing? My
thought is heavier wall as I will be putting the insulators on it. Also, I
would like some idea of the capacitance or range I'll likely need on 80, and
the resonant frequency of the vertical as described without linear loading
(to calculate that piece).
Again, since this is not a tower per se, please reply to atrampler@att.net.
Thanks,
Art, K0RO
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