[TowerTalk] Re: C31 Side Mount
Stan or Patricia Griffiths
Sat, 13 May 2000 16:31:33 -0700
There is a sidemount/tower cleanance diagram for the sidemounts that are fabricated by K7PN (CustomMetal Works)
on my web site at
Click on Antronics, Click on CustomMetal Works, Click on "sidemount clearance diagram". At least this is the
clearance for the CustomMetal Works model of sidemounts. Other models may (and some definitely DO) require more
distance between elements on the boom for clearance. You need to ask the manufacturer what the clear boom space
requirements are for his sidemounts. I can't see how any sidemounts could require any LESS element clear boom
space than the CustomMetal Works models.
Larry Alkoff wrote:
> So, you want details?
> The tower is a 120' Rohn 55 guyed at 115 and 70. The legs are 18" on a face.
> The side mount is integrated into a Rohn TA-55 torque assembly and consists of a 10 foot mast
> with an Orion rotator at the bottom and a thrust bearing at the top.
> There is 30" clearance between one of the 10 meter directors and one of the 15 meter directors
> at the mast mount point and that's not enough to clear those directors from touching the tower at an
> early stage of rotation. I forgot the numbers of the elements. You need 50" to clear everything.
> I'm not sure because I have not tried this but a Rohn 25 _might_ clear.
> Agreed that a TIC ring might work but first I'm looking into the alternative of modifying the
> C31 so it has the required 50" clearance by "stretching" the boom.
> You _do_ have a boom stretcher, don't you? ;-)
> "It's only money". I had no idea of what I was getting into - all I ever wanted to do was work a little dx.
> Hope this makes things clearer.
> On Fri, 12 May 2000 19:56:10 -0500, Timothy L. Bratton wrote:
> >Larry --
> >I wish your TowerTalk posting about your problem with side-mounting the
> >C31 had contained more details. What kind of tower? What kind of side
> >mount? What ran into what???
> >The opening in the C31 at the mounting point is, what, 30 inches? So
> >the max tower leg spacing on which it will side-mount is about 14
> >inches. That's Rohn 25. No more.
> >Maybe the answer to your problem is a TIC ring rotator. That will turn
> >it just fine. It's only money, right?
> >I've got one C31-XR at 95 ft. Hope to get a coax to it soon.
> >Best wishes.
> >Timothy L. Bratton K5RA
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