Hi Herbert, Try searching for "tuner" under the business&industrial category on eBay. I just did that and found several, although the only one which had a datasheet link was a digital-output tuner for DBS. However, most likely some of the others have datasheets which can be found online. I will take a look to see if I can find the ones I got and I may sell them if I can find them. Sean On Tue, Jun 28, 2011 at 11:49 AM, Herbert Graf wrote: > 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. >> >> 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 > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .