Re: SUD (Small Ugly Dish)
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
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
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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participants (3)
-
Bob Bruninga -
Eric H. Christensen -
Sil - ZL2CIA