[Fwd: Re: [TowerTalk] Rohn FK 25 & KT34XA]

[Jim Nipper]

Message-ID: <39418C5A.4DA2@southeast.net>
Date: Fri, 09 Jun 2000 20:31:22 -0400
From: Jim Nipper <jnipper@southeast.net>
Reply-To: jnipper@southeast.net
X-Mailer: Mozilla 3.01Gold (Win95; U)
MIME-Version: 1.0
To: Bill Aycock <baycock@HIWAAY.NET>
CC: Tower Talk <towertalk@contesting.com>
Subject: Re: [TowerTalk] Rohn FK 25 & KT34XA
References: <3.0.5.32.20000608200504.00a48b20@HIWAAY.NET>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

It is correct the the Rohn book says that their (prior) 68 foot foldover
should be guyed at 25 feet from the base of the tower, using four guys
at each level. This guying distance is about 35% of the tower height. 

I wonder if one could go up to 88 feet, on a regular Rohn 25 tower,  and
guy at 35 feet from the base, using four guys?? This would be about 40 %
of the tower height. 

The antenna would be about 12 square feet. 

I also have a related question. Do many of you fellows still use those
antenna climbing masts made by ILX (I think that is the name).  This
ladder mast is abt 12 feet long I think, and of course the tower is
normally guyed at the very top of the top section.  It has been said
here that the tower should not be guyed at any place other than the top
of the top section.  But what is the difference between having a tower
with a ladder mast sticking 12 feet above the top of the tower, compared
with guying a tower at the BOTTOM of the top tower section ?? Would not
that top section be the same as the ladder mast ??

I do know that the first answer is to ask an engineer. I agree.  But I
want the second answer, hi !!!

73 and tks to all !!!


de Jim K4PYT

Bill Aycock wrote:
> 
> As a matter of fact- the Rohn specs for the 58 ft foldover are not 18 ft.
> That figure is for the 48 ft version, and is for 4 guy wires, not three.
> Tom is right- in general, "more is better" as far as guy radius is
> concerned.  I have the 48 ft version, guyed per specs. THe spec for the 58
> (and 68) ft folding tower is 25 ft radius, not 18 ft.
> 
> In following the "prime directive" it is nice to know what the Mfg says- in
> this case- try to get the Rohn specs. Champion radio has the complete Rohn
> booklet, with all the common drawings and specs, for a reasonable price. My
> copy has the fold-over specs in it.
> 
> Bill-W4BSG
> 
> At 05:48 AM 6/8/00 -0600, you wrote:
> >
> >On Mon, 5 Jun 2000 19:06:50 EDT K7LXC@aol.com writes:
> >>
> >> In a message dated 06/05/2000  jskatz@sk.sympatico.ca writes:
> >>
> >> >  I have a chance to purchase a discontinued Rohn FK 25 (58' fold
> >> over tower).  I understand the 25G accessories fit  the FK 25.. The
> >> >  recommended guying radius is 18' but for a variety of reasons I
> >> think I will guy it at 32'.
> >> >
> >>       Uh...maybe not. The LXC Prime Directive says to "DO what the
> >> manufacturer says". That being the case, guy it where they say.
> >> While their  drawings for other tower heights and windspeeds are
> >> just ONE guying  scenario,
> >> the foldovers are much more critical in their installation and use.
> >>
> >       Please give us ONE good reason why guying closer
> >       in to the tower would be better, stronger, or safer
> >       than guying further out.  I can't imagine one.
> >
> >       It would be prudent to check this with Rohn or
> >       a qualified Professional Engineer.
> >
> >       de  Tom  N4KG
> >
> >
> >________________________________________________________________
> >YOU'RE PAYING TOO MUCH FOR THE INTERNET!
> >Juno now offers FREE Internet Access!
> >Try it today - there's no risk!  For your FREE software, visit:
> >http://dl.www.juno.com/get/tagj.
> >
> >--
> >FAQ on WWW:               http://www.contesting.com/FAQ/towertalk
> >Submissions:              towertalk@contesting.com
> >Administrative requests:  towertalk-REQUEST@contesting.com
> >Problems:                 owner-towertalk@contesting.com
> >
> >
> -
> Bill Aycock   ---   Persimmon Hill
>  Woodville, Alabama, US 35776
>  (in the N.E. corner of the State)
>       W4BSG   --   Grid EM64vr
>         baycock@HiWAAY.net
>              w4bsg@arrl.net
> 
> --
> FAQ on WWW:               http://www.contesting.com/FAQ/towertalk
> Submissions:              towertalk@contesting.com
> Administrative requests:  towertalk-REQUEST@contesting.com
> Problems:                 owner-towertalk@contesting.com



--
FAQ on WWW:               http://www.contesting.com/FAQ/towertalk
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 owner-towertalk@contesting.com