Hi I would guess that to count as disciplined, the OCXO (or Rb) needs to be phase or frequency locked to the incoming signal. NTP normally just does an estimate of where things should be and moves on.
With either WWVB or WWV, the phase change in the carrier is pretty massive. To use carrier phase you would need a multi day average to feed the loop. Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Chris Albertson Sent: Thursday, March 01, 2012 12:37 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Heathkit GC-1000 WWVDO Does an NTP server using WWV as a reference clock count as a WWVDO? If so then there are likely a few of them around. I have a really nice RF front from an old WWV receiver that I want to get working. Well it does work but I'm using a general coverage reciever to convert the IF to audio, need to replace that. I also have a c-max wwvb receiver. The goal is to run them as NTP reference clocks. I know they are not as good as GPS but the point to to measure the delay and hopefully learn something about ionosphere from the delay. But both of these are looking at the data streams. Maybe better to look at the carrier and lock an XO to that? On Thu, Mar 1, 2012 at 8:41 AM, Brooke Clarke <[email protected]> wrote: > Hi: > > Has anyone done stability plots on the Heathkit GC-1000? Although it's a > clock good to 0.1 seconds, it's also a WWV disciplined oscillator (WWVDO). > The linear power supply makes use of a 7805 and so heats up the enclosure > which is hard on the electrolytic caps but also acts as a crystal heater. > On the other hand installing a switching power supply like the PT5101 will > cool the enclosure but may degrade the stability of the oscillator. > > Are there any WWVB disciplined oscillators (WWVBDO)? > > http://www.prc68.com/I/HeathkitGC1000.shtml > http://www.prc68.com/I/Loop.shtml > > -- > Have Fun, > > Brooke Clarke > http://www.PRC68.com > http://www.end2partygovernment.com/Brooke4Congress.html > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to 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 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
