[TowerTalk] Phillystran sizing and use

[Nat Davis]

I hope this is a simple question.....
I am putting guys on top of my 40' Rohn 25 tower.  The Rohn book calls for 
the use of about 50' of 3/16 EHS for each guy.  50' seems to fall in the 
"to be avoided" lengths per the ARRL antenna book discuss on guy wire to 
antenna interactions...

So, if I wanted to use Phillystran for the upper section of each guy (using 
EHS for the bottom section hedging against vandals, etc.), what size of 
Phillystran do I need?  I can not find anything that says which of the 5 
diameters of Phillystran stocked by Texas Towers I should use.  To get the 
same breaking strength per guy as 3/16 EHS, I would need to use the middle 
size of the 5.  Is that overkill?  What should I tension the guys to?  The 
same 10% figure as in EHS?

Or, at 40', is it going to be worth the hassle of using Phillystran at all???

Thanks and have a good weekend,

Nat Davis
N4EL


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