[time-nuts] ntpdc -c kern explanation
Colleagues, Can someone give me a lay mans explanation of each of the lines of output from my ntpdc -c kern command please? [root@tock /usr/local/etc]# ntpdc -c kern pll offset: 8e-07 s pll frequency:-2.289 ppm maximum error:0.006736 s estimated error: 1e-06 s status: 2107 pll ppsfreq ppstime ppssignal nano pll time constant:4 precision:1e-09 s frequency tolerance: 496 ppm pps frequency:-2.289 ppm pps stability:0.011 ppm pps jitter: 1.564e-06 s calibration interval: 256 s calibration cycles: 1646 jitter exceeded: 345 stability exceeded: 1 calibration errors: 1 [root@tock /usr/local/etc]# Thanks! Ron -- Ron Hahn, EI2JP Rosslare Strand, County Wexford, Ireland ___ 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] z3801 - holdover and recovery issue
On 7/11/2011 3:57 PM, Charles P. Steinmetz wrote: Ron wrote: Colleagues, My Z3801 has developed a peculiar problem over the last few weeks. The problem is that it seems to oscillate between gps-lock and holdover. When I checked further it seems to be oscillating between, locked, recovery, and holdover, mostly staying in recovery and holdover. Have you tried substituting another antenna and cable (even just a short cable with the antenna indoors)? This looks like what I'd expect a 3801 to do if its antenna or antenna connection were intermittent. While you have it disconnected, check that the 3801 is putting antenna power on the coax. Hi Charles, I disconnected the mushroom-style antenna and measured the voltage between the TNC centre pin and shield; This was 5 volts. Connection looked clean and unaffected by weather or moisture ingress. Reattached the connector and screwed it on until it was tight, then rechecked gpscon. Satellites are now being received. So I can only deduce from this that the TNC male (cable end) to TNC female (mushroom antenna) is intermittent. Don't understand why but it now looks like it is receiving 6 satellites and the 3801 is in recovery mode. http://www.ei2jp.org/gpscon/gpsstat.htm R ___ 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] z3801 - holdover and recovery issue
Colleagues, My Z3801 has developed a peculiar problem over the last few weeks. Its been running for several years now (at three different QTHs) and has worked flawlessly until recently. The problem is that it seems to oscillate between gps-lock and holdover. When I checked further it seems to be oscillating between, locked, recovery, and holdover, mostly staying in recovery and holdover. The gpscon status page is here - http://www.ei2jp.org/gpscon/gpsstat.htm Having checked closer today, I noticed that the EFC is only today showing err in the health monitor. Suggestions on whan'ts gone wrong please? Thanks, Ron EI2JP ___ 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] HP Z3801A, GPS vs UTC?
On 6/7/2011 10:40 PM, cook michael wrote: Le 07/06/2011 21:15, r...@lcs.mit.edu a écrit : I have an HP 58503A. It has an Option H14,H19 sticker on the back. The circuit board has 58503-60001 Rev C stamped on it. It has been running continuously and locked to GPS for a few days, and it knows the correct number of seconds between GPS and UTC. The unit displays GPS time, without the leap seconds correction. The front-panel display says GPS xx:yy:zz, and :system:status? says GPS 1PPS Synchronized to GPS Time, not to UTC as the manual shows. I'd be much obliged if anyone could tell me how to get the unit to display UTC instead of GPS time. I think these use a similar command set to the Z3801A try :diag:gps:utc?should show 0 if the unit is in GPS, 1 if UTC if that gives coherent results, try :diag:gps:utc 1 to force the mode Colleagues, For someone who is not understanding these modes, can you explain what is this difference between UTC and GPS time? I have a HP Z3801A which I have been using for some years. Do I need to change this to UTC time? Thanks, Ron ___ 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] HP Z3801A, GPS vs UTC?, NTP
On 6/11/2011 2:47 PM, Magnus Danielson wrote: On 06/11/2011 02:11 PM, Ron Hahn (EI2JP) wrote: On 6/7/2011 10:40 PM, cook michael wrote: Le 07/06/2011 21:15, r...@lcs.mit.edu a écrit : I have an HP 58503A. It has an Option H14,H19 sticker on the back. The circuit board has 58503-60001 Rev C stamped on it. It has been running continuously and locked to GPS for a few days, and it knows the correct number of seconds between GPS and UTC. The unit displays GPS time, without the leap seconds correction. The front-panel display says GPS xx:yy:zz, and :system:status? says GPS 1PPS Synchronized to GPS Time, not to UTC as the manual shows. I'd be much obliged if anyone could tell me how to get the unit to display UTC instead of GPS time. I think these use a similar command set to the Z3801A try :diag:gps:utc?should show 0 if the unit is in GPS, 1 if UTC if that gives coherent results, try :diag:gps:utc 1 to force the mode Colleagues, For someone who is not understanding these modes, can you explain what is this difference between UTC and GPS time? I have a HP Z3801A which I have been using for some years. Do I need to change this to UTC time? If you only wish a 10 MHz and PPS, no. GPS time will do just as well. If you also want UTC time for NTP server for instance, then you do want either to use the UTC mode or let the server know it runs on GPS time and compensate itself. Magnus, I am interested in UTC time for weather satellite reception, synchronising via NTP. I tried the GPSCON program for the Z3801A but could never get it to broadcast ntp information on my LAN. Recently, I have purchased some Sure GPS boards from Sure Electronics (http://www.sureelectronics.net/goods.php?id=99). David Taylor has a great page on this at http://satsignal.eu/ntp/Sure-GPS.htm ... but now I am thinking his time is maybe always 15 seconds off, yes?? R ___ 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.
