Jwpjj@aol.com wrote:
> I am getting ready to install 90' of Rohn 25, base section is all
> done,concrete etc and so are the guying stancheons that are set in concrete
> as well. I
> have the first 10' up and hopefully in a few weeks or so will be ready for
> the rest of the installation. My question is what is preferred, steel guying
> cable or Phillystran cable. One of my concerns ( maybe it should not be) if I
>
>
My preference is the Phillystran. Although it has a tiny bit of stretch
the catenary with EHS will allow a lot of movement. ROHN recommends
3/16" EHS . 1/4" would add a lot of weight. Tensioned properly
resonance is not normally a problem with EHS. Catenary is very shallow
using Phillystran.
> use steel guying installation, should I be concerned about resonance based on
>
> the lengths of guying cable. The tower will have a 4 el steppir at approx
> 98',
> below that there will be a 3 element 40 meter monobander, prosistel rotator
>
However, as others have already said, this is a *lot* of load for a
25G.P/N 25G70D090 gives guying points at 28', 57' and 85' using 3/16"
EHS anchored 72' out from the base. In CT you have both gusty winds and
ice. Were it me, I'd not tackle a load like this with a tower smaller
than 45G.
73
Roger (K8RI)
> and fed with LMR400. Will I need to break up the guys? It seems like it
> would
> be a lot of work if I had too or should I just go for the Phillystran and
> don't be concerned. This is my first guyed tower as I have always have had
> crank ups. I have seen a lot of pictures that have been on this forum and
> was
> wondering what most everyone else uses for guying their towers. The guying
> lengths will be as per Rohn specs, 80% of total height to calculate guys
> lengths.
>
> John, ND1X
>
>
>
>
> **************Vote for your city's best dining and nightlife. City's Best
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--
Roger (K8RI - ARRL Life Member)
www.rogerhalstead.com
N833R (World's oldest Debonair)
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