Re: [time-nuts] Odetics Telecom CommSync - GPS Rollover Problem.
> Anyone else on the list have Odetics CommSync's and can report on their > status? Most software like ntpd can "fix" offsets like that. From ntp.conf on a KS-24361 that I haven't managed to get started correctly: fudge 127.127.26.0 time1 619315199.0453 (That's about a second short of 1024 weeks. It normally needs -0.9547) Of course, that doesn't help if the device has a built-in display that you want to use. -- These are my opinions. I hate spam. ___ 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] Wanted schematic Oscilloquartz B-1325 5MHz OXCO
Hello to the group, I just got another Telefunken ZA 100 KK Masterclock with IRIG A and IRIG B outputs. This was a time standard used by German Bundeswehr and has an Oscilloquartz B-1325 5MHz OXCO. It is probably about 40 years old. It uses an old style HP cabinet which was used with the HP 8640. In fact one ZA 100 KK has the older grey color cabinet and the other the newer light brown color. As expected the ZA 100 KK was dead on arrival. I have not looked into it but will start with the power supply and tantalum capacitors. That reminded me that the OXCO in my other ZA 100 KK is off frequency. It is outside the tuning range by about 0.5 Hz. A couple years ago I tried to find a schematic and even contacted Oscilloquartz in Neuchatel/Switzerland but didn't get a response. As a result the ZA 100 KK went onto the shelf about 8 years ago. I hope somebody here might have a schematic of the B-1325 OXCO. I am also locking for a matching DCF 77 receiver for the ZA 100 KK for more than 10 years but never found one. I do have a couple daughter displays. vy 73 Heinz DH2FA, KM5VT Von meinem iPhone gesendet ___ 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.
Re: [time-nuts] Odetics Telecom CommSync - GPS Rollover Problem.
Hi Rob, I don't know if there's new firmware. For most of my GPSDO I don't actually need date & time so it's been less of a priority for me to deal with gps rollover events. Anyone else on the list have Odetics CommSync's and can report on their status? /tvb - Original Message - From: "Rob Kimberley via time-nuts" To: "'Discussion of precise time and frequency measurement'" Sent: Friday, March 23, 2018 1:50 PM Subject: [time-nuts] Odetics Telecom CommSync - GPS Rollover Problem. > I wonder if Tom Van Baak can help me on this one. > > > > Recently powered mine up for the first time in a few years. Although the > unit survived the original GPS Rollover, it obviously can't cope with the > subsequent one, and is currently showing June 01, 1998 as I type this.. > > > > Tom, as you bought one of these off me, do you know of any updated firmware? > > > > Thanks and kind regards > > Rob K > > ___ > 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] Odetics Telecom CommSync - GPS Rollover Problem.
I wonder if Tom Van Baak can help me on this one. Recently powered mine up for the first time in a few years. Although the unit survived the original GPS Rollover, it obviously can't cope with the subsequent one, and is currently showing June 01, 1998 as I type this.. Tom, as you bought one of these off me, do you know of any updated firmware? Thanks and kind regards Rob K ___ 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.
Re: [time-nuts] WWVB Antenna revisited/Spectracom 8182
Martin NIST did preserve the AM data so that the cheapy clocks typically worked. But phase tracking receivers don't. Regards Paul WB8TSL On Fri, Mar 23, 2018 at 5:35 AM, Martin Burnicki < martin.burni...@burnicki.net> wrote: > paul swed write: > > I'll add to the comments the spectracoms are phase tracking receivers and > > do not work on the new BPSK signal. > > When the German PTB made effort to increase the accuracy and reliability > of the DCF77 long wave receiver in the 1980s, they implemented thus in a > way that old receivers of the original AM modulation would not be affected: > https://www.ptb.de/cms/en/ptb/fachabteilungen/abt4/fb-44/ag- > 442/dissemination-of-legal-time/dcf77/dcf77-phase-modulation.html > > If I remember correctly then there were some discussions with folks a > NIST when they were going to introduce their new modulation scheme, but > even though the guys at NIST knew that their approach would break > existing receivers, they implemented it anyway that way, even though > other (compatible) ways would have been available. :-( > > Martin > ___ > 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.
Re: [time-nuts] WWVB Antenna revisited/Spectracom 8182
Hi There is a *lot* of analysis on the WWVB change in the archives. The bottom line seems to be that the change did not impact wall clocks and watches. The number of companies running WWVB phase synchronous gear *appears* to have been near zero at the time of the change. There certainly was no giant flood of gear onto eBay. There also does not seem to have been an uproar in the commercial sector. Bob > On Mar 23, 2018, at 5:35 AM, Martin Burnicki > wrote: > > paul swed write: >> I'll add to the comments the spectracoms are phase tracking receivers and >> do not work on the new BPSK signal. > > When the German PTB made effort to increase the accuracy and reliability > of the DCF77 long wave receiver in the 1980s, they implemented thus in a > way that old receivers of the original AM modulation would not be affected: > https://www.ptb.de/cms/en/ptb/fachabteilungen/abt4/fb-44/ag-442/dissemination-of-legal-time/dcf77/dcf77-phase-modulation.html > > If I remember correctly then there were some discussions with folks a > NIST when they were going to introduce their new modulation scheme, but > even though the guys at NIST knew that their approach would break > existing receivers, they implemented it anyway that way, even though > other (compatible) ways would have been available. :-( > > Martin > ___ > 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.
Re: [time-nuts] WWVB Antenna revisited/Spectracom 8182
The AM modulation stuff is not affected also by the new WWVB signal. The WWVB problem affecting timing and frequency receivers is the 180deg phase modulation where the DFC77 is only 13deg and is randomized so that the mean phase is zero. On Fri, Mar 23, 2018 at 10:35 AM, Martin Burnicki wrote: > paul swed write: >> I'll add to the comments the spectracoms are phase tracking receivers and >> do not work on the new BPSK signal. > > When the German PTB made effort to increase the accuracy and reliability > of the DCF77 long wave receiver in the 1980s, they implemented thus in a > way that old receivers of the original AM modulation would not be affected: > https://www.ptb.de/cms/en/ptb/fachabteilungen/abt4/fb-44/ag-442/dissemination-of-legal-time/dcf77/dcf77-phase-modulation.html > > If I remember correctly then there were some discussions with folks a > NIST when they were going to introduce their new modulation scheme, but > even though the guys at NIST knew that their approach would break > existing receivers, they implemented it anyway that way, even though > other (compatible) ways would have been available. :-( > > Martin > ___ > 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.
Re: [time-nuts] WWVB Antenna revisited/Spectracom 8182
paul swed write: > I'll add to the comments the spectracoms are phase tracking receivers and > do not work on the new BPSK signal. When the German PTB made effort to increase the accuracy and reliability of the DCF77 long wave receiver in the 1980s, they implemented thus in a way that old receivers of the original AM modulation would not be affected: https://www.ptb.de/cms/en/ptb/fachabteilungen/abt4/fb-44/ag-442/dissemination-of-legal-time/dcf77/dcf77-phase-modulation.html If I remember correctly then there were some discussions with folks a NIST when they were going to introduce their new modulation scheme, but even though the guys at NIST knew that their approach would break existing receivers, they implemented it anyway that way, even though other (compatible) ways would have been available. :-( Martin ___ 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.
