[amsat-bb] Re: Looking for a G3RUH dish
bruninga at usna.edu
Wed Jan 4 14:54:02 PST 2012
> Regarding your Cu wire dish... you might look at
> the Tek Sharp dishes as an easier alternative to "rolling your own."
We are after absolute minimum wind drag. I don't think the Tek dish would
survive accurate tracking while driving along the interstate at 70 PMPH to
catch a balloon. And we want it to be a good 3' by 4' dish... Need the
gain for the tiny wifi video link...
I picked one up on ebay about a year ago and put it in my attic... waiting
for amsat-dl :-)
I have a spare PF dish about 60 cm, but it is steel, not aluminum like the
G3RUH. I used it on AO-40 for 24 GHz. Let me know off-list if you want it.
---- previous message ----
You probably have one of the K5GNA "BBQ" dishes. The G3RUH is a solid round
>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
>(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
>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
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