[TowerTalk] guy wire resonance

[Gedas]

Dave, this is good advice and a good place to start but I seem to remember an interesting analysis Beezley did with an early version on MN many years ago.  I think he was using MN but I might be wrong.  He did an analysis of the f/b and gain of some HF yagi on a tower using the guy wire recommendations given in the ARRL antenna book.  The pattern and f/b were effectively altered in a negative way.  I think it might be a good idea to start with those recommendations but to model the actual lengths to be sure.
73,
Gedas

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----- Original Message ----- 
From: "Frederick M. Mott" <ab8ah at earthlink.net>
To: "'Dave'" <k4em at mindspring.com>; <towertalk at contesting.com>
Sent: Friday, December 23, 2005 10:03 AM
Subject: Re: [TowerTalk] guy wire resonance


Look in the ARRL Handbook, chapter 30 of the 2004 handbook has a table
called "Guy Wire Lengths to Avoid".  I am sure this table can be found in
the older or newer versions of the ARRL Handbook.  Fred

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Dave
Sent: Friday, December 23, 2005 8:17 AM
To: towertalk at contesting.com
Subject: [TowerTalk] guy wire resonance

I am replacing some guy wires on a 70' Rohn 25 with a 40m beam. What is the
spacing between the insulators so the guys are not resonant? The guys are
3/16" EHS and I am using the 500D insulators. I lost 3 guys due to ice storm
last week, the Phillystran was cut in half on the top 2 guys but the bottom
guy with all steel cable was undamaged. It was the 4000lb Phillystran.

Dave
_______________________________________________

See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless
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_______________________________________________

See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.

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