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An Amateur Television Down Converter. Do they exist. Answered

I've read on Wikipedia where it states "ATV transmissions can be viewed by setting a television to cable input and attaching an outdoor 70 cm antenna. For more sensitive reception, some users may use a purposely-built ATV down-converter." How can I build one or can you find it. I could probably get an old cable box but it suggest that you can build a down converter for the purpose of receiving Amateur TV on your television.  




Apparently kits do exist.

Thank you, I never could find them before on Yahoo I was searching for just Down Converters not a circuit.

I would still like to know if you can build the down converter cause they are costly.