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Re: [TowerTalk] unguyed heights for Rohn 65 etc.?

To: <towertalk@contesting.com>, "Joe Subich, K4IK" <k4ik@subich.com>
Subject: Re: [TowerTalk] unguyed heights for Rohn 65 etc.?
From: "RICHARD BOYD" <ke3q@msn.com>
Date: Fri, 14 Jan 2005 00:00:31 -0500
List-post: <mailto:towertalk@contesting.com>
Okay, it looks, then, as if Rohn 65 would do the job at 50' but wouldn't be 
enough at 60' -- unguyed.  I would guess that Rohn 80 would have a little 
more capability, being huskier.

Even putting one guy set on the tower should greatly increase its 
capability -- I'll have to think about the aesthetic and footprint tradeoffs 
versus the other options.

73 - Rich, Ke3Q


----- Original Message ----- 
From: "Joe Subich, K4IK" <k4ik@subich.com>
To: "'RICHARD BOYD'" <ke3q@msn.com>; <towertalk@contesting.com>
Sent: Thursday, January 13, 2005 10:59 PM
Subject: RE: [TowerTalk] unguyed heights for Rohn 65 etc.?


>
>
> > Anyone have an idea (or facts) how high I could go unguyed
> > with Rohn 65, assuming a single 48' boom monobander for 20,
> > or 15, or 10 (plus appropriate rotator, and I'll have the
> > yagi right above the tower, shortest mast possible within
> > reason)?
>
> The Rohn Commercial Catalog (11993) gives the following
> allowable antenna areas for Rohn 65 at 80 MPH (Prince Georges
> Co. is 75 MPH zone):
>
>
> Ht.      no ice    1/2" ice
>
> 50'       19.7       19.1
> 60'        9.4        4.1
>
> Note 3:  Designs assume two 7/8" lines on each tower face.
>          (nb: 7/8" line is .0875 sq. ft. per lineal foot)
>
> > Okay, let me toss out another possibility:  Rohn 80 (I know
> > it comes in various sub-models, some 40" face, some 44" face
> > and there may be other differences, but assume the basic or
> > the typical one).
>
> No chart in my book for Rohn 80 free standing.  "Each tower
> is individually engineered to handle a particular job."
>
> Rohn 80 is 41" center-to-center on the legs however the legs
> vary from 2" to 3" in standard (schedule 40?) and X-STR
> (schedule 80?).  Rohn 80 has both standard (zig-zag) and
> cross braced sections.
>
> 73,
>
>    ... Joe, K4IK
>
>
> 
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