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" <firstname.lastname@example.org>
To: "Joe Reisert" <W1JR@arrl.net>; "K1JB" <email@example.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
> > 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
> 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 Ogden
> NA9D (ex: KE9NA)
> Citizen of the People's Democratic Republik of Illinois
> Life Member: ARRL, NRA
> Member: AMSAT, DXCC
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