Oops. Meant this to go to the reflector.
As I recall, Rohn said you could have up to 33 feet of unguyed tower above a
housebracket. I have never seen anything about unguyed without the bracket.
I am using the above arrangement with a Hazer, and it works well. Before
the Hazer, I climbed the tower if not frequently, then regularly for
inspections and repair/adjustments to the antennas. It does sway a bit in a
breeze. But it also survived three hurricanes this last year, with me
forgetting to lower the Hazer with my 3 el Steppir for Katrina. The eye
passed over my area. Lost a couple of trees, but the tower and antenna did
----- Original Message -----
From: "Pat Barthelow" <firstname.lastname@example.org>
To: <email@example.com>; <Steve@bnjcomp.com>
Sent: Tuesday, January 24, 2006 4:15 PM
Subject: Re: [TowerTalk] tower specs/not wind loads
> Been there, done that, on a Rohn 25, 50 footer free standing, of a ham
> friend, donating some tower work....The tower was professionally
> with what looked like a 5' by 5' square concrete base. I did not know
> deep the concrete was. I assumed the engineering was right because the
> tower was installed by a well known local 2 way radio business...
> I worked on it from time to time, on my friend's TA 33 beam, and was
> DEFINITELY uncomfortable with the sway and 'exposure' I felt 50 ft up,
> unguyed. Kept telling myself quietly...Well this WAS installed by a 2 way
> contractor.. must be right.....I later was told that there was no official
> Rohn specs for any unguyed 25 tower, but that it was not uncommon to have
> done on a case by case basis (with case by case engineering) to heights of
> 40 ft. Gave me the Willies......haven't been up that tower since.
> 73, DX, de Pat Barthelow AA6EG firstname.lastname@example.org
>>From: "A.J. Farmer (AJ3U)" <email@example.com>
>>To: Steve Shelton <Steve@bnjcomp.com>
>>Subject: Re: [TowerTalk] tower specs/not wind loads
>>Date: Tue, 24 Jan 2006 16:00:04 -0500
>>On 1/23/06, Steve Shelton <Steve@bnjcomp.com> wrote:
>> > Hi, I am fairly new to towers and I have tried to research information
>> > on rohn's 25, 45 and 55 towers. I have found quite a bit of
>> > information
>> > on these towers but not the exact answers that I am looking. One of my
>> > questions is what is the maximum safe height on these three towers
>> > without guying? How much weight can they handle guyed or unguyed? The
>> > reason I ask is that I do a lot of tower climbing and often run into a
>> > rohn 25 that is not guyed. Most are only 40' but some as high as 80'
>> > and without guy wires these towers do a lot of swaying. I would feel
>> > more comfortable on these particular towers if I knew for sure that an
>> > extra 200lbs harnessed to the side of this tower is not going to be the
>> > stick that broke that camels back. Thank you for any information that
>> > you have.
>>C'mon fellas - none of you answered this guy's question but instead
>>hijacked the thread and started on about other things not even related
>>to his question...
>>Steve, my understanding is that the maximum freestanding height of
>>Rohn 25G is 30 to 40 feet. I would assume that this limit allows for
>>an average (200lb?) climber doing maintenance, but I have always
>>wondered the same thing. I don't know about 45G and 55G, but I do
>>know that they were designed as guyed towers, not freestanding.
>>Everyone talks about wind load, but what about the load of somebody is
>>hanging off the side near the top? How does that compare? I don't
>>have the engineering experience to do this calculation. Perhaps
>>someone on this list knows how to do this? If so, then that load can
>>be compared "apples to apples" with a wind load, right? Some hard
>>numbers sure would make me feel better about being up there... I have
>>a 30 foot freestanding 25G tower and it makes me nervous when it sways
>>when I'm on top. I can't imagine being up 80 feet unguyed... You are
>>a brave man, indeed!
>>A.J. Farmer, AJ3U
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