[TowerTalk] N1RR's 2014 Rohn 55G 120ft Tower project
dscribner at myfairpoint.net
Fri Jan 3 07:49:24 EST 2014
I sent you a spec sheet for Rohn anchors...
Doug - K1ZO
----- Original Message -----
From: <john at kk9a.com>
To: <towertalk at contesting.com>
Sent: Friday, January 03, 2014 7:32 AM
Subject: Re: [TowerTalk] N1RR's 2014 Rohn 55G 120ft Tower project
> Did Rohn change their anchor specifications? I thought the strength of
> the anchors used to be in their catalog but I am not seeing it online.
> With that windload and your area you have reason for concern. You could
> always add a second set of anchors. My closest 15m and 40m beams are
> about 16 feet apart and I have no noticeable interaction however my 40m
> beam is not resonant on 15m. You should model your proposed installation
> to ensure minimal interaction.
> John KK9A
> To: towertalk at contesting.com
> Subject: [TowerTalk] N1RR's 2014 Rohn 55G 120ft Tower project
> From: n1rr at comcast.net
> Date: Fri, 3 Jan 2014 02:56:53 +0000 (UTC)
> Hi ! I've got a few questions. Here's what I'm doing: Rohn 55 120ft
> I live in Massachusetts near the northeast corner of Rhode Island. It's a
> MPH zone. I'd classify this as an Exposure B
> (Wooded) area.
> I put the guy anchors and the base in back in '99. I used GAR30 anchor
> rods and
> a 10 foot tower section along with
> the re-bar that was required at that time at all four locations. Base and
> anchor holes were completely filled with
> 4000psi concrete.
> First, I worried about the anchor rods. I wish I had used the larger
> GAC3455 or
> 5655. I was steered to the GAR30's.
> What are these limited to ? At what load will they fail at ?
> This limit may dictate what I ultimately put onto the tower.
> Second, what equalizer plates should be used ? Should I double up on
> Will those bolts be adequate ?
> My third biggest question might not be appropriate for this list but here
> I have a full size Wilson 40M3.
> ( Yes, I'm planning a star guy bracket at the top. )
> How far way should a 15M yagi be from the 40 ?
> My guess is 15 to 25 feet.
> How far way should a 20M yagi be from the 40 ?
> Based on what I've seen in the field, 10 to 12 feet should be plenty here.
> Charlie N1RR
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