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

[Doug Faunt N6TQS +1-510-655-8604]

Speaking of which, can any of the available amateur software packages 
handle a moving ground station?  I'd like to be able to automate the 
antenna tracking on a boat.

73, doug


On 05-Jan-12 05:55, Greg D. wrote:
>
> Hi Bob,
>
> I'm trying to visualize you driving (bouncing) down the freeway at 70 mph with a square yard of curved (airfoil!) metal sitting at odd angles to the air flow, trying to aim it at a target you may not be able to see clearly, which is also moving at some rate in another direction, with an accuracy of +/- a half dozen degrees (which is what you get with a dish that size).  I had a hard enough time aiming my 30 inch BBQ grill at AO-40, from my nearly stationary house (this is California, after all), with up to date KEPS, a rotor system calibrated earlier against the position of the Sun, NBS-sync'd clock on a Linux PC, and so forth.
>
> Even if you mount the dish inside a camper minivan with a fiberglass roof (think mobile Radome), I don't see how this is going to work.  I've seen you do amazing things, but what are you thinking?
>
> The best use of the dish would probably be to catch the balloon payload as it falls from the sky...
>
> Greg  KO6TH
>
>
>> From: bruninga at usna.edu
>> To: k5oe at aol.com; amsat-bb at amsat.org
>> Date: Wed, 4 Jan 2012 17:54:02 -0500
>> Subject: [amsat-bb] Re: Looking for a G3RUH dish
>>
>>> 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...
>>
>> Bob
>>
>>
>>
>> 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 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
>>>
>>
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