[TowerTalk] Distance between Guys and Antennas?

[Rex Lint]

Frank,

You say "Rohn's engineering drawings show guys installed at the top and some

distance down."  When I look at the info at
http://www.rohnnet.com/ROHNNET/rohnnet2001/catalog/pdfs/25G/25G-9.pdf
I see only one set of guys, 50 ft. each, and they hook on at the 38 foot
point, for the 110MPH wind loading version.  What engineering drawings are
you looking at?

I'd just put insulators in to break up the guys and not worry any more about
it. 

For question 3, I'd guess guys that are any closer than 1.2 * 10^2 thumbs
should be broken up.

Regards,

Rex Lint, K1HI
26 Brek Dr.
Merrimack, NH 03054
PH:   603-860-7651    FAX: 603-882-6612

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Frank N. Haas
Sent: Thursday, September 22, 2005 11:03 PM
To: TowerTalk at contesting.com
Subject: [TowerTalk] Distance between Guys and Antennas?

Tower Gang:

I'm going to be guying my 40 foot Rohn 25G tower with a single set of 3/16 
EHS guys. I have limited real estate in which to do this.

The tower was free-standing but last year's hurricanes convinced me I need 
to change that. It's currently guyed with ropes I installed as an emergency 
fix after the first hurricane blew through. They held the tower nicely for 
the next two that blew through.

I'm thinking of removing the current pointy top section and replacing it 
with a regular section. At the top will be a rotor plate and thrust bearing.

Once guyed, the tower will support a 3 element SteppIR beam and a VHF/UHF 
17.5 foot omni vertical.

Question 1:  At what point on the tower should I install the guys?? I'm 
thinking 35 feet.

Rohn's engineering drawings show guys installed at the top and some 
distance down. I only want to install one set of guys...at least at first.

Question 2:  How far should guys be from the typical 3 element yagi to 
minimize interaction? Do I need to split up the guys with insulators???

My guys will be about 43 feet long. The top of the guys will be about 10 
feet from the yagi antenna.

Question 3:  Is there some sort of "rule of thumb" for the distance from 
the top of the guys to the antenna before the guys need to be broken with 
insulators???

Thanks!

73,

Frank N. Haas KB4T
Florida


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