[TowerTalk] New Rohn catalog
dieven at comcast.net
Mon Nov 23 18:17:07 PST 2009
I got the skinny little 25G manual only.
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of K7LXC at aol.com
Sent: Monday, November 23, 2009 5:34 PM
To: towertalk at contesting.com
Subject: [TowerTalk] New Rohn catalog
Howdy, TowerTalkians --
I picked up my new Rohn catalog from the mailbox today and it's the
whole catalog. I think what happened is that after the first couple of
Stephanie started sending out the 25 and 45 sections and not the whole
catalog. Other than that I've got no clue.
As far as the new catalog goes, I have mixed feelings about it. It's
slicker with a lot less engineering and specs and a lot more white space on
the pages. It's more of a sales tool than hardcore engineering handbook.
They're using the TIA-222 F AND G revisions which IMO confuses things
a bunch. The same tower will have two different ratings for two different
windspeeds and two different revs. I'm not an engineer so am only
peripherally familiar with the 222. Rohn spends a couple of pages on Rev G
introduce new specs - structure class, exposure rating and topographic
category. Where in the past the old catalog had real signed engineering
drawings and some building departments accepted them, I think anyone trying
use these new ones will only confuse the building department - I know it
Also there are no general engineering notes so there's no mention of
the 8.0 square feet of symmetrical mount that's deducted from the net
capacity in the older drawings but I think it's been added back in.
I think there are lots of changes as far as the specs go so be sure to
check the CURRENT information. For example:
Old 45G 100' 70 MPH 22.2 square feet guys: all 3/16"
New 45G 100' 70 MPH 24.3 square feet - Rev F guys: top - 1/4",
New #2 45G 90 MPH 17.0 square feet - Rev G guys: top - 1/4",
So I think that the new Rohn catalog looks good but now even more you
need to get an engineer involved in your installation to get the right
specs translated to your requirements. And if you're going to get a
PS - I'm not an engineer so any additional clarification appreciated.
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