On Tue, 2011-06-28 at 11:44 -0400, Sean Breheny wrote:
> One fairly common way to make a cheap spectrum analyzer for <1GHz is
> to use a surplus TV tuner module, the kind which used to be on
> computer analog TV input cards. These can be set up to take RF in,
> give a single IF frequency out (often 45MHz or 10.7 MHz), and take a
> tuning voltage input. These would allow you to tune from about 40MHz
> to 1GHz. They also often have built-in AGC with a signal strength out
> pin. You then can amplify the output, apply a much narrower filter,
> and feed it to a log-amp detector IC. Then, the combination of the AGC
> level out plus the output of the log amp would be your signal strength
> in the BW of the narrow filter.
>=20
> I bought a few of these tuner modules on eBay for only a dollar or two
> each just a few months ago. They came with documentation, too.

Thats exactly the kind of thing I'd like to find! Any pointers? Willing
to sell the ones you've got? :)

How would I go about searching for something like that? The
documentation would of course be key, don't want to try and figure
pinouts of modules on my own?

Thanks, TTYL

--=20
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