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Date: | Thu, 17 Nov 2011 08:15:33 -0500 |
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Tom,
You can go on line and find tables of coax lengths that aren't
recommended for various bands. Perhaps you have a total overall length
that the system doesn't like.
I'm also wondering about the installation. Perhaps changing the angle
of the radiating wire will affect things. I think you have the end at
10 feet; maybe raising or lowering will give you a change in swr.
You also said that it is grounded to the 40 foot metal mast. Is there
another ground wire running down from the feed point to ground? I'm
not sure I would trust the several joints in the mast to provide a good
rf ground.
If there is a single ground rod at the base, maybe try attaching some
radial wires and just lay them on the ground.
I have seen the web site for this antenna, and with all due respect,
think that the claim of 2:1 swr across 120 khz of the 160 band is a bit
pie in the sky. I know that for ground mounted verticals the worse the
ground system, the wider the 2:1 swr band width. As the ground is
improved, antenna efficiency improves and the swr bandwidth shrinks.
Post a time and freq for 160 test, and I will try to be there.
73, Steve KW3A
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