[Towertalk] Guy wire resonance. Break it up or use stubs?

[Pete Smith]

At 07:50 AM 6/25/02 -0400, Saul Abrams wrote:
>I replaced the first two 27 foot sections with Philly and the
>clover leaf disappeared.


For what it's worth, another supporting anecdote.  I have a Force 12 
EF-240S, at 104 feet, on a Rohn 25 tower with top guys at about the 95-foot 
level.  Originally, I had 21-foot semi-rigid fiberglass insulators starting 
at the tower, and then one-piece steel guys to ground level.  I didn't 
notice any SWR perturbations, but the antenna didn't seem particularly 
directive, nor did it perform well in contests.  I replaced my top guys 
with Phillystran, and the antenna came to life.  this seems to indicate 
that even 25-30-foot spacing away from guy wires may not suffice on 40m.


73, Pete N4ZR

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