An appropriate location for this, since Dave Leeson is a Caltech grad.
Bob, N7XY
On Sat, Aug 10, 2002 at 10:21:17PM -0700, Michael Tope wrote:
> Dennis,
>
> Warren, KE6LEA and I put together the flex-disc shock absorber
> scheme pictured below for the M^2 OR-2800 rotator at W6UE:
>
> http://www.cco.caltech.edu/~w6ue/KT/OR-2800-1.jpg
>
> Warren got the flex-disc from a local Mercedes dealer. I think
> he found that the Mercedes disc is considerably cheaper than
> the BMW disc (I think he paid $40). The bottom flange for
> the flex disc is the stock Orion flange which we trimmed down
> from an ellipse to circle for a better fit in Rohn 25. The top
> flange assembly is a home brew job that Warren cut and
> welded up from some steel rem that he had laying around his
> shop.
>
> Some folks probably consider this setup to be overkill, but
> the antennas we are turning are a bit on the heavy side for
> Rohn 25. The flex-disc arrangement was the cheap
> alternative to replacing the existing Rohn 25 tower with
> Rohn 45 or 55.
>
> So far so good.
>
> 73 de Mike, W4EF.................................
>
> ----- Original Message -----
> From: "Dennis Mowers" <k5ya@gvtc.com>
> To: <towertalk@contesting.com>
> Sent: Tuesday, September 10, 2002 6:20 AM
> Subject: [Towertalk] Mast Coupler
>
>
> > Has anyone built the shock absorbing mast coupler described in Leeson's
> > "Physical Design of Yagi Antennas"?
> >
> > He describes a BMW "flex disc", used to isolate the drive shaft from the
> > transmission.
> >
> > My local NAPA auto parts supplier shows nothing in their books for any
> > year BMW.
> >
> > I will try BMW next.
> >
> > Has anyone ever seen one of these things?
> >
> > Dennis, K5YA
> > _______________________________________________
> > Self Supporting Towers, Wireless Weather Stations, see web site:
> http://www.mscomputer.com
> > Call 888-333-9041 to place your order, mention you saw this ad and take an
> additional 5 percent off
> > any weather station price.
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> >
>
>
>
> _______________________________________________
> Self Supporting Towers, Wireless Weather Stations, see web site:
> http://www.mscomputer.com
> Call 888-333-9041 to place your order, mention you saw this ad and take an
> additional 5 percent off
> any weather station price.
> _______________________________________________
> Towertalk mailing list
> Towertalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
--
Bob Nielsen, N7XY n7xy@n7xy.net
Bainbridge Island, WA
IOTA NA-065, USI WA-028S
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