[Antennas] Rohn Crank Over Tower

Sun, 1 Sep 2002 13:36:34 -0500

I have one of these to sell if anyone is interested.

73, J. Setcer  N5QJ

Russellville, Arkansas
Interstate 40 Exit 84

> Skip,
>
> The Rohn catalog says that the hinge on the 68' 25G model should be at
31.5'.  This leaves 36.5'
> above the hinge.  The allowed antenna areas are
>
> - with guys at the hinge only, 2.3 sq ft at 20 lb/sf (about 70mph) and
none at 30 lb/sf (about 87
> mph)
>
> - with guys at the hinge and apex, 11.7 sq ft at 20 lb/sf and 6.2 sq ft at
30 lb/sf
>
> The guys are all 3/16" EHS.  Also, the safe load at the apex for this
configuration is 115 lbs.
>
> If you only build the tower to 58' or 48', all of these numbers increase.
>
> I have the 45G version of this tower.  Some, especially on TT, will slam
the fold-over idea.  I have
> had no trouble with mind in the 20 years I have had it.  Of course, I have
been careful, such as no
> folding it over when there is any wind blowing.  Perhaps others have not
been as careful, and that
> has lead to problems.
>
> Let me know if you need more info.
>
> Bob, W9UI.
>
> -----Original Message-----
> From: [email protected]
[mailto:[email protected]] On Behalf Of Skip
> Caswell
> Sent: Sunday, September 01, 2002 9:34 AM
> To: [email protected]
> Subject: [Antennas] Rohn Crank Over Tower
>
> Hello
>
> Recently purchased a Rohn 25  70ft crank over tower.  The question I have
> is where the break over section of tower should be located.  It appears
> there are two places it could be.  One place could be at about 41ft with
> 26ft of tower located above or I could put another section of tower above
> the hinge point for a top section of 36ft and the bottom section of 31ft.
> Im not sure if the later could be the correct makeup.  Does any one have a
> print or instructions for this type of tower?   The tower was in pieces on
> the ground and the person was not sure how it went together.  I will be
> posting this on Tower talk also.  Thanks.
>
> Skip KE9L
>
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