Hello TT,
As a small time metal fabricator and a solver of small time tower/antenna
problems, I offer to build a rotor fixture that will allow you to mount
your rotors anywhere in the tower you want. The material stock can be steel
or aluminum, and I'll include the stainless steel U-bolts and nuts.
I have one of the these in use now on my tower. It consists of a plate for
the rotor to bolt to and three spokes of 1" square material that extend
from the plate to just beyond the tower legs. The U-bolts pass around the
tower leg and through the spokes. The installer can use a small square to
set the apparatus perpendicular to the tower legs. Contact me off list for
other details.
At 01:22 PM 1/14/2003 -0800, you wrote:
>Jon,
>
>Your are quite correct about the rotator mounting, John. If you
>cut just one of the Z-braces in a standard straight section, however,
>you can actually get a rotator as big as an Orion OR-2800 inside
>Rohn 25. The trick is getting a rotator plate installed among the
>Z-bracing. You can either install the standard Rohn plate right
>below that last set of horizontal rungs at the bottom of a standard
>straight section (I think this requires a spacer in some cases to
>get the rotator housing far enough above the horizontal rungs), or
>you can notch the plate to fit among the Z-braces (or design
>your own plate that misses the Z-braces as I did).
>
>Of course as I learned the hard way, its better to go with Rohn
>45 and avoid all these problems from the get go.
>
>73 de Mike, W4EF....................................
>
>----- Original Message -----
>From: "Jon Ogden" <na9d@speakeasy.net>
>To: "Joe Reisert" <W1JR@arrl.net>; "K1JB" <k1jb@maine.rr.com>;
><towertalk@contesting.com>
>Sent: Tuesday, January 14, 2003 12:14 PM
>Subject: More on - Re: [Towertalk] Rohn rotator plate for 25G
>
>
> > on 1/14/03 10:14 AM, Joe Reisert at W1JR@arrl.net wrote:
> >
> > > Jon,
> > >
> > > I disagree. The plate I use is mounted near the TOP of my Rohn 25 top
> > > section, the section with the flat top.
> > >
> > > I do agree that it would be nice to mount it at the bottom....where it
>wont
> > > fit... without having to cut the Z braces!
> >
> >
> > I just looked at the Rohn catalog sheet.
> >
> > The 25AG4 top section is 8' 3/16" long. The spot for the rotor is 1' 4"
> > 3/4"(or 16 3/4") from the top. That's plenty of room to mount the rotor
> > plate and rotor. You don't want a lot of mast going down the tower. All
>of
> > the Rohn top sections have a space with no Z truss in order to mount the
> > rotor and rotor plate.
> >
> > Keep in mind that a rotor like a Ham IV won't even fit inside the section
> > with the Z-truss there anyhow. It's too wide.
> >
> > Jon
> >
> > -------------------------------------
> > Jon Ogden
> > NA9D (ex: KE9NA)
> >
> > Citizen of the People's Democratic Republik of Illinois
> >
> > Life Member: ARRL, NRA
> > Member: AMSAT, DXCC
> >
> > http://www.qsl.net/na9d <- Updated on 1/12/03!!!
> >
> > "A life lived in fear is a life half lived."
> >
> >
> > _______________________________________________
> > AN Wireless Self Supporting Towers at discounted prices,
> > See http://www.mscomputer.com
> >
> > Wireless Weather Stations now $349.95. Call Toll Free,
> > 888-333-9041 for additional information.
> > _______________________________________________
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> > Towertalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
> >
>
>
>
>_______________________________________________
>AN Wireless Self Supporting Towers at discounted prices,
>See http://www.mscomputer.com
>
>Wireless Weather Stations now $349.95. Call Toll Free,
>888-333-9041 for additional information.
>_______________________________________________
>Towertalk mailing list
>Towertalk@contesting.com
>http://lists.contesting.com/mailman/listinfo/towertalk
Thank you,
Robin Midgett KB4IDC
IDC Technology
rmidgett@bellsouth.net
www.idctechnology.com
615-322-5836 days - rolls to pager
3232 Beckwith Road
Mt. Juliet, TN 37122-5215
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