I'm experimenting with single-end audio communication and pulse frequency modulation (modulation strength 0.2x f0 around f0). The receiving side doesn't have to synchronize, but just convert the frequency to volts. I've made a working simulation using a resettalbe integrator, reciprocal calculator (for audio FM only), ac coupling and an antialiasing filter on 0.58x f0. The last 4 steps are best done in a microcontroller. Mark On 1/29/06, David P Harris wrote: > > Mark Jeronimus wrote: > > >Hi > >This is the general principle of UWB: > >http://www.asahi-net.or.jp/~ny3k-kbys/contents/uwb_technology.html< > http://www.asahi-net.or.jp/%7Eny3k-kbys/contents/uwb_technology.html> > >* > >* > >I also got some clues from section 3 of this document: > >http://www.kuroda.elec.keio.ac.jp/pdf/kuroda/2003/2003_19.pdf > > > >I hope this is what you need. > > > >Mark > > > > > Looks to me like the transmitter is very simple, but the receiving is > very hard. The receiver has to filter *syncronized* to the transmitter, > or else you have to slide the receiver filter along until you get the > signal. It doesn't look at all easy to build that par - but I hope I > am wrong! > > Also, the last url above should probably be: > > > David > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist