Sorry my example should of said skip 126 cycles every 500 seconds (500/4 +1) ----- Original Message ----- From: "WarrenS" <[EMAIL PROTECTED]> To: <time-nuts@febo.com> Sent: Monday, November 24, 2008 10:27 AM Subject: Re: [time-nuts] GPSDO using 100Hz
> Mike > > Neither do I, know how to reply to a post that is. This may be the blind > leading the blind > and end up in some unknown place. > True it would be simpler to use the High freq Osc directly but it would not > be accurate. > The problem with just using the High freq as you suggested is that it is not > at any known, exact or even constant frequency. > The divider number can change for each low freq cycle. Example if the master > freq was say 0.2520 Hz high then > every forth second the divider would add 1 extra divide count and every 500th > second it would divide by an additional extra clock time, > therefore skipping 11 divides every 500 seconds. > > Regards, > Warren > ************ > ----- Original Message ----- > From: "Mike Monett" <[EMAIL PROTECTED]> > To: <time-nuts@febo.com> > Sent: Monday, November 24, 2008 9:02 AM > Subject: Re: [time-nuts] GPSDO using 100Hz > > >> Hi, >> >> Sorry, I don't know how to reply to a post using the digest. But my >> question is if 100Hz or 10KHz are available from a GPS unit, where do they >> come from? Does that mean there is a 10MHz oscillator somewhere on the pcb >> that is just divided down? >> >> If so, then adding another PLL loop to control an external 10MHz crystal >> will just add additional noise, jitter, variable phase offset, etc. >> >> If there is already a 10MHz oscillator, wouldn't it be simpler to add a >> buffer like paralleled sections of a 74AC04 to the source, and drive a 50 >> ohm coax directly? >> >> Regards, >> >> Mike Monett >> >> _______________________________________________ >> 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. > > _______________________________________________ > 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. _______________________________________________ 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.