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

[Sil - ZL2CIA]

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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