KD5NWA On the transformer ideas there are two others I can think of. Digi Key and Mouser sometimes list 96 kHz transformers or some at 78 kHz or so. Next, the idea of using 600 ohm to 600 ohm (or 600 to 1200 ohms or more) modem type transformers. These will have enough bandwidth for 96 kHz. Some may have one of the windings at impedances higher than 1200 ohms. And well, these are cheap alternatives.
With an audio signal generator you may analyze placing capacitors across one or both windings to tune the bandpass or shift the transformers center frequency. You can adjust one of the windings for a certain center and the other winding for another center frequency and hence tailor and spread out the output. Using this idea you can also make the transformer act like a passive but switchable bandpass filter for wide or narrow bandpass. So there is allot you can do with such ideas. Good audio transformers always give you certain options of use. The tranformer can do more than just match impedances. It can be switched into filter mode if you want to use it as such. I am thinking that if Mosfets are used to make the quadrature detector section then the gain of such; may allow a mere transformer after that as the intermediate stage between the detector and the sound card without amplification? Only test will tell for sure. That would be an interesting thing if it will work. ka9rza _____________________________________________________________________ Call Anyone, Anytime, Anywhere in the World - FREE! Free Internet calling from NetZero Voice Visit http://www.netzerovoice.com today! ------------------------ Yahoo! Groups Sponsor --------------------~--> Everything you need is one click away. Make Yahoo! your home page now. http://us.click.yahoo.com/AHchtC/4FxNAA/yQLSAA/ELTolB/TM --------------------------------------------------------------------~-> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
