In a message dated 4/16/02 8:00:42 AM Pacific Daylight Time,
jskatz@sk.sympatico.ca writes:
> I need to insulate the top section of my upper guys from my tower to
> eliminate some tower-antenna interaction I think I am getting with my
C31XR.
> Is it okay to use a few feet of Phillystran for the top section and EHS for
> the rest?
Sure. Using Phillystran at the top and EHS to the anchor is the
recommended installation method anyway. That keeps the Phillystran out of
reach of possible vandals or fire.
You'll probably need more than "a few feet" to get any benefit from the
Phillystran.
Is the C31 on top of the tower and the above the guys? What does the swr
do when you key the xmtr and rotate the antenna? If it changes, then the
culprit is typically the guys.
I guess the more basic question is what kind of interaction are you
seeing?
> If it is then what is best method to use to couple the EHS and the
> Phillystran?
Since you'll have a termination loop at the end of each segment, one way
is to couple them loop-to-loop (getting the two thimbles inter-connected is
usually the hard part since you may have to open one of them up). The other
way is to use an intermediate shackle (also known as a clevis) to connect the
loops. Just use a shackle twice the size of the guy wire.
> Or is there a simpler inexpensive solution to isolating the EHS from the
tower?
Not really. You could use johnnyball insulators but then you need them
and more Preforms so there's really no price advantage.
Someone asked a couple of days ago asked about the relative size specs
for Phillystran. Rather than bother Ken at Phillystran (who's really an ace
guy), here is the info:
Nomenclature Jacket OD Breaking # EHS equivalent
HPTG1200 0.17" 1200# 3/32"
HPTG2100 0.22" 2100# 1/8"
HPTG4000 0.30" 4000# 3/16"
HPTG6700 0.37" 6700# 1/4"
Cheers,
Steve K7LXC
TOWER TECH -
Professional tower services for industry and amateurs
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