Different words for the same phenomena. In the time domayn we call it delay; in the frequency domain we call it phase shift.. Henk.
----- Original Message ----- From: "Mike Young" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Wednesday, May 14, 2008 1:09 AM Subject: Re: [softrock40] Re: harmonic/oversampling?? > It's not so much a phase shift we're after, but a 90 deg. delay at the > center frequency. > > I'm very much interested in this converstation, and will go back to > lurking. > > > ----- Original Message ----- > From: "henkkeppel" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Tuesday, May 13, 2008 5:59 PM > Subject: [softrock40] Re: harmonic/oversampling?? > > >> Well this is a good idea, use two simple quad diode mixers. >> I wrote before in thse columns that I tried this in the sixties of >> the former century with Germanium diode quads but these diodes were >> not fast enough then, nor were the Si ones. I selected them on equal >> voltage on conducting because that determined the carrier suppression. >> The 90 degrees phase shift is on VHF much easier obtainable then on >> HF. Just take a quarter wave coaxial cable. Take into account the >> velocity factor, so about 1ft+. And with the now available thin >> coaxial cable it will be much smaller then with RG58 or59 of those >> days. We used a griddipper to determine the quarter wave. >> For transmission we also needed a 90 degrees shift between the 2 >> audio signals. That was very difficult and was realised with a >> complex RC filter with many poles and zeroes of non standard values. >> If I had enough time I would give it a try. > > > ------------------------------------ > > Yahoo! Groups Links > > > > > > --- > avast! Antivirus: Inkomende bericht is niet besmet. > Virus Gegevensbestand (VPS): 080513-0, 13-05-2008 > Getest op: 14-5-2008 1:13:29 > avast! auteursrecht (c) 2000-2008 ALWIL Software. > http://www.avast.com > > > --- avast! Antivirus: Uitgaande bericht is niet besmet. Virus Gegevensbestand (VPS): 080514-0, 14-05-2008 Getest op: 14-5-2008 9:24:09 avast! auteursrecht (c) 2000-2008 ALWIL Software. http://www.avast.com ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/softrock40/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/softrock40/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> 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/
