[amsat-bb] Re: SUD (Small Ugly Dish)
Eric H Christensen
eric at christensenplace.us
Wed Oct 3 05:08:08 PDT 2007
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.
>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.
>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.
>> Eric Christensen, W4OTN
>> AMSAT Area Coordinator - Southeastern Virginia USA
>> AMSAT Member 35360
>> Donate to the Eagle Fund -
>> Bob Bruninga wrote:
>>>>Back to my "new" [18"] dish... Being that it
>>>>is an offset dish, is 1.2GHz possible with
>>>>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:
>>>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..
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