Bob, Regarding your Cu wire dish... you might look at the Tek Sharp dishes as an easier alternative to "rolling your own." I picked one up on ebay about a year ago and put it in my attic... waiting for amsat-dl :-)
http://www.plumdragon.com/teksharp/hr_AO-40_products.htm
Drew, 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.
73, Jerry, K5OE
---- previous message ---- 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@usna.edu Sent: Jan 3, 2012 2:19 PM To: 'Andrew Glasbrenner' glasbrenner@mindspring.com, 'amsat-bb' amsat-bb@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