I'll have to look around, this idea is very old from before the Internet, and most H&P now do the 1 bit to save on logic but now PLL circuits are inexpensive. I think this technology has been mostly forgotten, but have no fear soon someone will claim they invented it.
As far as the transformer I was planning on using as high impedance as possible to not load down the output of the op-amp, I was thinking of the 101J or the 101F. At 07:40 PM 6/10/2006, you wrote: >Hi Cecil, > >I totally agree with you and have a few questions. > > > > > Huff&Puff encompasses a lot of circuit variations, I like to use the > > more advanced forms that look at more than one bit of variation. The > > simpler versions have the problem that the circuit is never happy and > > keeps toggling back and forth not happy with either choice of frequency. > > > > The version I like is basically a PLL circuit but the phase > > comparator locks to any multiple of the reference frequency not at an > > exact one and only one frequency. The phase comparator is the only > > difference between it and a PLL. It tends to be smooth like a PLL in > > that it's not hunting for the frequency all the time like the one >bit H&P do. > > > >Do you have any link - or references - to such H&P oscillators? > > > As far as the transformer my plan was to put it on the output of the > > audio amplifiers for the purpose of totally isolating the radio from > > the sound card. I have not seen any clear explanation what it will do > > for you by putting it between the QSD switches and the input to the > > audio amplifiers that can't be achieved by changing the output > > windings of the transformer that feeds the QSD switches. > > > >That is also my idea. Which impedance would you use for these as there >are several models? > >Jean-Claude PJ2BVU > > > > > > > > > >Yahoo! Groups Links > > > > Cecil Bayona KD5NWA www.qrpradio.com "Windows the worlds most successful software virus" ------------------------ Yahoo! Groups Sponsor --------------------~--> You can search right from your browser? It's easy and it's free. See how. http://us.click.yahoo.com/_7bhrC/NGxNAA/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/
