[TowerTalk] beam antenna truss

[Patrick Greenlee]

Don't use nylon as it is too stretchy.  Don't use polypropylene as it lacks 
UV resistance (Good water ski rope though) Dacron is a good very low stretch 
rope, preferably treated for UV resistance but you can put a sleeve over it 
like cut from a throwaway garden hose .  You can cover the knots with black 
silicone caulk and prevent the knots from weathering.  Phillystran is an 
excellent material but...don't clamp it or tie it in a knot.  Use the 
approved methods of terminating it: 1. the Chinese finger grabber type grips 
or the 2. the two part catalyzed potting system. Not really practical to use 
the grips on a really short piece of Phillystran.  some argue against a 
conductive material but commercial antennas use conductive material often. 
If you have the ability to do the math or perform the tests you can find out 
what the effect of a conductive material is.

73 Patrick AF5CK


-----Original Message----- 
From: Cqtestk4xs at aol.com
Sent: Sunday, December 23, 2012 7:10 PM
To: TOWERTALK at contesting.com
Subject: Re: [TowerTalk] beam antenna truss


The cheapest is to use is wire.  However, this can cause interaction  accord
ing to some, with the Yagi.

Many use rope.  On my M2 antennas Dacron is used, fastened to the boom  by
mean of an eyebolt through the boom.

Some guys use Phillystran in the same fashion.

Bill KH7XS/K4XS

In a message dated 12/24/2012 12:50:36 A.M. Coordinated Universal Ti,
w1dxh at aol.com writes:


Looking for info on best way to truss a long boom yagi. What is  the best
material to use? How to secure to boom etc. Thanks for  help.

73,
Steve  W1DXH
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