I went by Rohn's published specs so I could get a tower permit. The City
required that they be followed to the letter, and sent out inspectors to verify
the hole, rebar, concrete foundation and the final installation. Our local
radio club did lots of work (with a local volunteer ham Attorney) to get the
HDBX48 approved, at a time when they weren't approving any other ham towers.
I never would have gotten the permit if I hadn't used an antenna with a boom
length of 10 feet or less. Maybe the City Engineers saw the same BX towers
across the river that I saw, that had come down after being overloaded. They
weren't rated to be used as guyed towers.
It was worth all the trouble for the permit, though, the quad busted many a
pileup, first call.
-----Original Message-----
From: Doug Renwick <ve5ra@sasktel.net>
Sent: Aug 25, 2022 4:08 PM
To: <larryj@teleport.com>
Subject: RE: [TowerTalk] Joining sections of aluminum mast
I see you fell for the 10 foot max boom length. For years I have used BX
towers with antenna boom lengths well over 30 feet. Towers are guyed.
Doug
Free Climbing - The ultimate test of strength and technique.
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
larryj@teleport.com
Sent: August-25-22 9:42 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Joining sections of aluminum mast
That tower load caught my eye, too. I have an HDBX tower, and I was only
able to get the City's tower permit by staying within the Rohn published
load limits. So I went with a 2-element tri-band quad antenna, which only
had a boom length of 8 feet.
At a previous QTH, I had a Mosley TA-33 tri-band yagi. But I couldn't put it
on this BX tower, since the boom length (I think it was 16 feet) exceeded
the 10-foot allowable boom length in the tower ratings' specifications.
When I read this thread about a SteppIR was being put up on a BX tower, that
caught my eye, immediately. I've seen two - folded-over/destroyed BX towers
in this area, with antenna loads that exceeded Rohn's specs. Fortunately,
neither of them were mine.
LJ
--
This email has been checked for viruses by Avast antivirus software.
www.avast.com
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|