I was faced with this problem a few years ago, too. I essentially followed John's solution, but used the 1pps GPS pulse as the PLL reference. I then used the 32.768K vco output to injection-lock the 32.768K crystal on the LCD clock. Much to my surprise, it worked quite well. And, as pointed out already, jitter isn't an issue for this application. Bill Ezell ---------- They said 'Windows or better' so I used Linux.
John Franke wrote: The only thing that comes to mind is to divide the 10 MHz by 2500000 (5x5x100000) and then use a phase locked loop to multiply by 8192. Of course the PLL would best control a varactor with a clock crystal vice controlling an RC oscillator. Other divisor multiplier pairs are: 1250000/4096, 625000/2048, 312500/1024, 156250/512, and 78125/256. John WA4WDL ----- Original Message ----- From: "Max Skop" [1]<[EMAIL PROTECTED]> To: [2]<time-nuts@febo.com> Sent: Wednesday, July 23, 2008 10:09 AM Subject: [time-nuts] How to get 32.768KHz from 10MHz. How does one get a 32.768KHz signal from our 10MHz reference. There does not appear to be a nice divide ratio to do this. With a locked 32.768KHz signal one could lock the oscillator of any of the cheap (low cost) LCD clocks that are available with nice big digits, temperature sensors and calendars, etc. Any suggestions on how to do it?? Regards Max ps. I got sucked in good. Six months ago all I had was an HP 10811 and now I have another crystal oscillator, two rubidiums and a Trimble GPS. _______________________________________________ time-nuts mailing list -- [EMAIL PROTECTED] To unsubscribe, go to [4]https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [EMAIL PROTECTED] To unsubscribe, go to [6]https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. References 1. mailto:[EMAIL PROTECTED] 2. mailto:time-nuts@febo.com 3. mailto:time-nuts@febo.com 4. https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts 5. mailto:time-nuts@febo.com 6. https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.