[TowerTalk] A Different Take On Guy Wires?

[DavidC]

This from K4OJ was a good testimony!
".........so far so good for K4XS who has three 200 foot towers in the same
area you are moving to - all using Philly..."

>      What tower flex? You mean torsionally? That'll happen no matter what
guy
> material you use.

But is not Phillystran more flexible at the same tension than EHS?  Thus
would
it not allow a little more sway under high wind gust conditions?

>      Vibration? Haven't run across that one before.

Are not the strands of EHS more stiff (and-to-end) than Phillystran, thus
vibrations
initiated at any point would be transmitted to anything connected?  Or do
the insulators
effectively deaden that?

>       Joint stress? Leg compression is the biggest factor in tower forces.
> The leg joints are stronger than the rest of the leg.

I was imaging the tower swaying a bit in 125-150mph gusts and rocking around
the connecting bolts.  (Sounds like something from a song, "rocking around
the
tower bolts, have a happy hurricane ..."  :-)  )

>       While I don't have the technical data in front of me, if you're
asking
> about possible elongation of EHS and Phillystran - for our ham purposes
they
> are both small enough that you don't have to worry about it.

Not permanent elongation but momentary under high stress moments?

>      Here's a suggestion - use the EHS-with-insulators on the bottom set
and
> 50% Phillystran/EHS on the top set. I think this'll reduce your risk
exposure
> while giving you some Phillystran benefits.
> Cheers,   Steve   K7LXC

50%?  I would use a 4 guy top rather than three?  Will have to explore that.

Thanks! & 73, DavidC  K1YP


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