[600MRG] /20 transmit antenna
Edward R Cole
kl7uw at acsalaska.net
Tue Feb 11 13:45:16 CST 2014
Rudy,'
Can you install guy lines to hold against the antenna wire? Might
have to be non-metallic or split up with strain-relief insulators (I
have them on the top 50-foot for one of my towers).
73, Ed - KL7UW
hoping to get eme array back into the air today (holds the Tx end of
my inverted-L so will enable getting it back up).
At 09:20 AM 2/11/2014, Rudy Severns wrote:
>I've learned to have great regard for icing on large wire
>antennas! The antenna itself was undamaged. The problem was the
>soil, it was very soft and the forces at the top of the poles was
>great enough to move the base a bit causing the poles to tip out of
>position just enough to detune the antenna. The problem is there's
>an 80' lever arm on one side of the fulcrum (the top of the pipe at
>ground level) and 7' on the other so there's a lot of force right at
>the top of the pipe at the ground surface.
>
>I've since pushed and shimmed the poles back to vertical but I still
>need to fuss a bit compacting the soil around the bases. The poles
>went up last summer and we had a very dry fall and early winter so
>the soil backfill hadn't really consolidated. At the last QTH where
>I had much larger poles I put a concrete ring around the base at
>ground level. I wanted to avoid that here but maybe I'll have to do it.
>
>I'll be fiddling with the antenna for a while before I get back on
>the air. I may even redesign it to have a lot less horizontal wire
>up in the air. Not that we expect such a storm anytime soon but who knows??
>
>73, Rudy
>
>
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73, Ed - KL7UW
http://www.kl7uw.com
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