[TowerTalk] Bonding Tower Sections

K8RI on Tower talk k8ri-tower at charter.net
Mon Jun 26 15:17:44 EDT 2006

> To all,
> I am in the design phase of building an 80m 4-square using Rohn 25 tower
> sections.  I am curious what measures people have taken to make sure that
> the sections are electrically bonded together.  Should I just clean the
> tower legs and use Noalox?

Personal opinion:

The legs are hot dipped twice in galvanizing material.  The joints are tight 
and usually the bolt holes require a taper pin punch to open them to where 
the bolts fit smoothly.  As the ROHN catalong says "NEVER drill out the bolt 
holes! Always use a taper pin punch to align and resize them.".

With this taken into mind I'd not use any compound in the joints as it'd 
change the coefficient of friction. IOW I'd put the tower together according 
to the book and call it good. Others might go to extra lengths, but I don't 
think it's necessary and in some cases could be detrimental the strength 
although with roughly 60 feet or so of the stuff  and nothing on it, I doubt 
strength would be an issue.

OTOH if some one has drilled out the bolt holes and sanded the legs to get a 
better fit (which they should not have done) then all bets are off.

Roger Halstead (K8RI and ARRL 40 year Life Member)
N833R - World's oldest Debonair CD-2

> Any information/opinions would be appreciated.
> 73 de ww
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