[TowerTalk] Guying Material and resonance

[sabrams at nycap.rr.com]

Skip the 3 element 40; get a 2 element shorty forty, guy real well and you should get away with it.  Always have EHS at the bottom of any Philly.  Saul  K2XA 
---- "Roger (K8RI)" <K8RI-on-TowerTalk at tm.net> wrote: 
> Jwpjj at 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
> >  
> >
> >
> >
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> 
> -- 
> Roger (K8RI - ARRL Life Member)
> www.rogerhalstead.com
> N833R (World's oldest Debonair)
> 
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