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On Sun, 21 Oct 2007 01:01:19 -0400, "Jimmie D"
wrote: "Dave Typinski" wrote in message .. . Anyone have any ideas about what one might do with a television receive-only (TVRO) antenna? The thing is 10' diameter and it's mine for the price of dismantling it and hauling it out of the present owner's back yard. I'm thinking radio astronomy. Might be nice to make my own radio map of the galaxy. I'm guessing that this would work okay somewhere between 1 and 10 GHz... which means making a feed horn... which is easy enough to do. What else could I do with this antenna? Other than covering it in polyethylene sheet to make a really big bird bath... -- Dave Typinski AJ4CO I know of a couple of guys that took two of them, one for rx and one for tx, tx was a microwave oven mgnetron. He and his frined talked to each other via troposcatter. I do know if a maggie operates within a ham band or not but it didnt matter too much for these guys because they didnt have a ticket anyway. Jimmie I thought about magnetrons... but not for communication. My idea is to set it up as a radar station to measure the distance to the Moon. A microwave oven magnetron operates at 2450 MHz, which is right at the upper edge of the 13cm ham band. Unfortunately, magnetrons produce a really dirty, wide output. Worse, being right at the edge of the band, half the RF energy would be out of band. I don't know if one can re-tune a magnetron by the addition of external components; I'd like to get the thing down to 2.42 GHz to put the emission in the center of the 13cm band. There are such things as tunable magnetrons; but, they aren't found in microwave ovens, which means they won't likely be had for free. That said, I'd sure like to look at the output from an oven magnetron with a spectrum analyzer. Maybe the output isn't as dirty and wide as I think it is. -- Dave Typinski AJ4CO |
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