Here's one that works well, just be sure to use a high speed device ( AC, VHC ) if you are using 60Mhz source
http://home.pages.at/chirt/sch/LOquadr_sch.jpg In fact I just built up this circuit to use with an American QRP Club DDS-60 in a computer controlled SDR front end I'm in the final stages of making JR --- In [email protected], Frank <[EMAIL PROTECTED]> wrote: > > I took a look at the LT5517. Does anybody have a circuit with a div by 2 90deg 0deg phase splitter? I always assumed it was made up with two D flip flops, one positive edge triggered, one negative edge triggered. There would be an issue of filtering caused by the harmonics of the square wave to deal with if the circuit really has digital logic. > > While we are at it, I never took an IC fab course so I don't know this second one either: I read that a D flip flop takes only 6 transistors in its most simplified VLSI implementation. Does anybody have a picture of that circuit? > > Frank > > >Message: 2 > > Date: Tue, 21 Feb 2006 16:28:44 -0800 (PST) > > From: FRANCIS CARCIA <[EMAIL PROTECTED]> > >Subject: RE: Commercial FM > > > >Hi David, > > I have an LTI eval board with the same part. I had it connected to the 40.455 MHz > > if of my RA6830 and the output looked pretty good. I have not tried to connect it to > > the computer yet. Just got a good machine in the shack so it is on my list of things > > to do. > > I was using an HP8640B as an LO. frank > > > >David WardenDurkee <[EMAIL PROTECTED]> wrote: > > Hi Frank, > >The quadrature demodulator I am using is the LT5517. (40 Mhz to 900 Mhz) > >I wasn't looking for any specific FM, I was just scanning around hoping to > >find anything. Commercial radio stations are more reliable to find. > > > 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/
