[amsat-bb] Re: SUD (Small Ugly Dish)

[Eric H Christensen]

Sil,
I look to Robert W0LMD (and others) for information on patch feeds.  You may want to check out http://www.ultimatecharger.com/dish.html to see some projects that were done on the larger dishes.

73s,
Eric W4OTN


>Eric,
>
>I've googled and looked in more traditional places for generalised 
>design data for patch antennas but come up empty handed. If you can 
>suggest anywhere I might find some engineering design guides I'd be very 
>happy. I want to build some for various frequencies, not just 2,4 GHz.
>
>Thanks
>
>Sil
>
>
>Eric H. Christensen wrote:
>> Thanks Bob.  I figured as much but I thought I'd ask.  I'm going to try
>> to set it up for S-band operation.  I'm going to try to build a patch
>> from ordinary items from around the house.  Maybe I can document it and
>> show others how to build their own setup to help demystify 2.4GHz.
>> 
>> 
>> 73s,
>> Eric Christensen, W4OTN
>> AMSAT Area Coordinator - Southeastern Virginia USA
>> AMSAT Member 35360
>> http://www.ericsatcom.net
>> 
>> Donate to the Eagle Fund - 
>http://www.amsat-na.com/donation.php?donate=eagle
>> 
>> 
>> 
>> Bob Bruninga wrote:
>> 
>>>>Back to my "new" [18"] dish...  Being that it 
>>>>is an offset dish, is 1.2GHz possible with 
>>>>this dish?  
>>>
>>>No.
>>>
>>>
>>>>Anyone tried this?
>>>
>>>Yes.  I tried it for our satellite labs for students and althogh I get about 
>14 dB or so measured gain with it at 2.4 GHz, at 1.2 GHz, it was nothing more 
>than a big piece of metal giving no more gain than a flat reflector... maybe 
>between 3 to 6 dB.  
>>>
>>>See the photo of its use at 2.4 GHz on the top of this page:
>>>
>>>http://www.ew.usna.edu/~bruninga/ea467.html
>>>
>>>With the antenna for one of those $75 wireless camera receivers at the focal 
>point, and the companion little wireless camera as a signal source a mile away 
>with only its 1.5" whip antenna, we receive the picture perfectly with a 
>margin of at least 16 dB.  This means the picture would still be good out to 
>maybe 6 miles...
>>>
>>>It sure is an easy way to get into Amateur TV.  Even though it does not even 
>require a license..
>>>
>>>But if there are wireless LANS around, then the picture gets lots of QRM..
>>>
>>>Bob, Wb4APR
>>>
>> 
>> 
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>