On Oct 1, 2006, at 11:05 AM, <ku8e at bellsouth.net>
<ku8e at bellsouth.net> wrote:
> I am trying to improve my signal on 20/15/10 meters. I can't put up
> a tower/yagi in the location I am in now so I am stuck with trying
> some type of wire beam. Anyone have any ideas ?
What kind of supports do you have?
K4OGG did quite well with monoband yagis suspended by ropes up in the
trees. These were tied off toward Europe for DX contests.
> I was thinking about a 2 el quad fixed to EU or maybe a 3 el
> inverted Vee
> beam - probably on 20 meters.
A Quad or Delta array might be easy to set up. I used a delta loop in
my attic for 10 and 15m before I got the tower up. If you have trees,
you only need one support for the top of a Delta loop. Use the 1005/f
formula to compute the length of wire in feet. I made a gamma match
for my loops that worked pretty well. My match arms were orignally
10% of the loop length. That turned out to be way too long and I cut
more than half of it off. 5% would be a good place to start.
For the DE or Reflector, go 3-5% shorter / longer (respectively). Two
elements is probably enough. Optimal spacing will give you 6-7 dB gain
> I had a lazy H in Ohio and thinking of cutting one for 15 meters
> and fix it SE/NW. This would work good for the
> west contest and Carribean on 20-10 meters- with a tuner. I have
> about 50-60 feet trees to work with...
You might consider the K4OGG trick. Otherwise, you have plenty of
supports to work with.
Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr at arrl.net
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901
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