[amsat-bb] Re: Looking for a G3RUH dish

[Andrew Glasbrenner]

You probably have one of the K5GNA "BBQ" dishes. The G3RUH is a solid round spun dish.

73, Drew

-----Original Message-----
>From: Bob Bruninga <bruninga at usna.edu>
>Sent: Jan 3, 2012 2:19 PM
>To: 'Andrew Glasbrenner' <glasbrenner at mindspring.com>, 'amsat-bb' <amsat-bb at amsat.org>
>Subject: RE: [amsat-bb] Looking for a G3RUH dish
>
>> I'm looking for one of the 60cm G3RUH dishes
>
>Got one, (but not available).  
>
>Questions:  I measured reflector grid separation as .88 inches which works
>out to be about 0.18 wavelength.  I always thought the grid had to be
>tighter than 0.1 inches to be an effective "surface".
>
>Maybe the difference with almost double the spacing is not that significant?
>(especially for a steel one which would be quite heavy.
>
>Reason I am asking is that I also need another S band dish (at 70 MPH on the
>roof of a tracking van) and we are thinking about building one by using an
>old solid 6' TVRO dish as a form and laying in copper wire and soldering it
>to copper straps.  With all that labor, I'd not want to get the spacing
>wrong.
>
>Bob, Wb4APR
>