I've got a pile of Sharp tuners (or at least they look like tuners). I don'= t have any data on them. Link to an image is below. If you're interested ma= ke me an offer. http://standingwave.org/webdav/xe6095.JPG -Pete On Jun 28, 2011, at 10:29 PM, Sean Breheny wrote: > OK, I looked at what I have and it is less impressive than what I > remember. Frequency range is only about 400 to 900 MHz. I have > attempted to attach a GIF image which I was sent by the eBay seller > when I bought them (qty 2). I also have a schematic but please ask me > offlist if you want it as it is a little bit bigger file and I do not > think that I should try to send it on-list. >=20 > Also, I came across this archived discussion on this topic of spectrum > analyzers from TV tuners: >=20 > http://www.nitehawk.com/rasmit/sa_notes1.html >=20 > The modules I have were made by Mitsumi, they have only one label on > them which seems to say TIF4-A41. Also appears to have a date code of > 8447 (47th week of 1984 I'd guess). These are probably not the best > bet for this project as there are more modern ones available, some > even with I2C-controlled digital tuning. >=20 > I would be willing to sell them if you are still interested. >=20 > Sean >=20 >=20 > 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. >>>=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. >>=20 >> Thats exactly the kind of thing I'd like to find! Any pointers? Willing >> to sell the ones you've got? :) >>=20 >> 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? >>=20 >> Thanks, TTYL >>=20 >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >>=20 > --=20 > 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 .