In a message dated 11/25/00 1:28:58 PM Pacific Standard Time,
fev@fibertel.com.ar writes:
> My Question is if it is necessary to use Guys with insulators to be sure
> that they are not resonants and if it is, how I calculated the lenghts
> between insulators.
A chart of resonances is in the ARRL Antenna Book. Most guys in the US
use 26 or 27 feet.
> What kind of insulators are the best in this use?
Ceramic. You can probably order some off the internet. Porcelain Products
#500D is for cable up to 3/16 inch and #502 is for 1/4 inch.
> Is necessary to use insulators at all the guys levels, I will have 2 levels
> at 9 and 17mts.
The top one is the most important.
> Any has experience with Kevlar guys?
US made Phillystran is the choice of many competitive stations with very
populated towers. It is a non-conductor and invisible to RF. Even with wire
cables broken up with insulators, it's still a bunch of steel that your
antenna is looking into.
Cheers, Steve K7LXC
Tower Tech
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