ah I found a couple companies that sell such a thing. They call it a non
penetrating roof mount.
The common ones seem to use cinder blocks as balast or weighting.
Rohn makes a 10 foot non-penetrating roof mount that supposedly can support
an antenna with up to 14 square feet of wind loading...
Its ni on to $300 though. Any of the other roof mounts I have found online
that are less expensive do not give any kind of specs.
Like the $65 3 foot type...which, I suspect can support around 2 feet of
wind loading or something.
73
Colin, V A6BKX
----- Original Message -----
From: "John Miller" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, March 29, 2007 3:21 PM
Subject: Re: roof mounting tripod
> I certainly understand that. I'm not sure who makes them, but I saw some
> just the other day when I was looking for a clamp to put my packet antenna
> on the vent pipe on my roof and there was a site that had all kinds of
stuff
> like that and they did have 3 or 4 different sizes and ratings of roof
> mounts that were made specially for just what you're trying to do. I
didn't
> save the site. If you look for antenna mounting or something like that on
> google though I'd bet you'll find a site. They weren't overly expensive
> either. I knew I heard of this done but that was the first time I saw
mounts
> made especially for that configuration. There were a few sites that had
them
> though. If I happen back across it I'll let you know.
> ----- Original Message -----
> From: "Colin McDonald" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Thursday, March 29, 2007 3:19 PM
> Subject: Re: roof mounting tripod
>
>
> > well, I have to consider getting the sand bags up to the roof.
> > 100LBS is a bit much for one average guy to haul up a ladder, but 75 is
> > just
> > manageable.
> > If they make roof top supports that can utilize sand bags, or concrete
> > blocks, then that is what i need.
> > any ideas as to who manufacturs them?
> > 73
> > Colin, V A6BKX
> > ----- Original Message -----
> > From: "John Miller" <[log in to unmask]>
> > To: <[log in to unmask]>
> > Sent: Thursday, March 29, 2007 11:07 AM
> > Subject: Re: roof mounting tripod
> >
> >
> >> They actually make mounts for just that kind of mounting and stuff, I
> >> wouldn't put a big beam on it, but for a smallish beam, with a
reasonably
> >> low wind load, you should be good, I'd put 75 LB sand bags though at
the
> >> least, I like to go overkill on my projects, but with something like
> >> that,
> >> it's better to go over than under. If you have a cushcraft beam in
mind,
> >> check out there site, I believe they have wind load ratings and stuff
> > right
> >> on the site or in the downloadable documentation.
> >> ----- Original Message -----
> >> From: "Colin McDonald" <[log in to unmask]>
> >> To: <[log in to unmask]>
> >> Sent: Thursday, March 29, 2007 12:33 PM
> >> Subject: roof mounting tripod
> >>
> >>
> >> >I mentioned in my last post about mounting a tripod or support
structure
> > on
> >> > a pitched roof for a small beam, likely 3 element 10, 15 and 20M
> >> > cushcraft.
> >> > I am not able to bolt the tripod or support structure to the roof,
but
> > may
> >> > be able to use heavy sand bags or other large heavy leg anchors.
> >> > Has anyone used something like this, and if so, what was the
> >> > configuration?
> >> > I think something like a four legged stand that goes across the peak
of
> >> > the
> >> > roof with 50 or 75 pound sand bags on each leg should be enough, but
> >> > I'm
> >> > not
> >> > sure.
> >> > Also, how low can I put the beam above the roof to avoid swr changes
as
> > I
> >> > turn it? The idea is to make sure the thing won't blow away in the
> > first
> >> > good wind, but I don't need to over do it either.
> >> > How heavy are the cushcraft tribanders and what is the wind load and
so
> >> > on.
> >> > 73
> >> > Colin, V A6BKX
> >>
> >>
> >> --
> >> No virus found in this incoming message.
> >> Checked by AVG Free Edition.
> >> Version: 7.5.446 / Virus Database: 268.18.20/737 - Release Date:
> >> 3/28/2007
> > 4:23 PM
> >>
> >>
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.446 / Virus Database: 268.18.20/737 - Release Date: 3/28/2007
4:23 PM
>
>
|
