Re: [time-nuts] End Of The World
Thank you Martin, To be honest, I didn't know that the sleep command could be utilized with a 1 Foolish of me to not have tried it. On 02/07/2015, Martin Burnicki martin.burni...@burnicki.net wrote: Frister wrote: My NTP server did a double 59 on the terminal. for anybody who is interested I captured the event : https://youtu.be/OpNci29CI7E I think you need to be careful if you just watch the time in a loop with a sleep 1. Due to slightly varying sleep intervals the time when the date command is called may interfere with the second boundary of the system time, so you may observe missing or duplicate times anyway. Eventually the following command shows less ambiguous results: while true; do date -u +'%F %T.%N'; sleep 0.25; done E.g.: 2015-07-02 09:46:01.236101917 2015-07-02 09:46:01.490039978 2015-07-02 09:46:01.743952328 2015-07-02 09:46:01.997539363 2015-07-02 09:46:02.251356539 2015-07-02 09:46:02.505238060 2015-07-02 09:46:02.759204117 2015-07-02 09:46:03.013218510 2015-07-02 09:46:03.267194076 2015-07-02 09:46:03.521256275 2015-07-02 09:46:03.775118487 2015-07-02 09:46:04.029012022 2015-07-02 09:46:04.283006237 2015-07-02 09:46:04.537024946 2015-07-02 09:46:04.790874099 Usually you get 4 timestamps per second, but eventually there may be only 3 or so, depending on the accuracy of the sleep intervals. In any case you have the fractions of the second to *see* that there is eventually a second :03.9 where you expected :04.0, or vice versa. 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. -- vbradio.wordpress.com ___ 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] End Of The World
My NTP server did a double 59 on the terminal. for anybody who is interested I captured the event : https://youtu.be/OpNci29CI7E I did measure an odd behaviour on leapsecond day from time-a.nist.gov NTP server usually it runs about 8 mS behind my local PPS but all the sudden went to +22 mS for most of the the UTC day, see: https://flic.kr/p/vnZGaU a few minutes after 00:00 it returned to the usual offset https://flic.kr/p/vrPsAR 73 Frits W1FVB On 01/07/2015, Martin Burnicki martin.burni...@burnicki.net wrote: Bob Camp schrieb: Hi So are we all still here? Any portion of the group blasted into non-existance by the leap second please speak up :) === Any observations of anomalous behavior yet? From a NVD8C-CSM v3.1 module in Glonass-only mode: $GPZDA,235958.00,30,06,2015,00,00*65 $GPGGA,235959.00,5158.9396,N,00913.5513,E,1,10,00.7,119.5,M,47.2,M,,*53 $GPRMC,235959.00,A,5158.9396,N,00913.5513,E,00.00,144.5,300615,,,A*5F $GPGSV,1,1,04,33,26,210,00,37,29,164,00,39,29,160,00,40,17,127,00*76 $GLGSV,3,1,10,68,36,066,46,69,74,335,41,70,26,270,49,77,17,018,35*61 $GLGSV,3,2,10,78,34,075,43,79,18,125,40,83,06,190,38,84,43,230,42*6F $GLGSV,3,3,10,85,42,304,45,86,07,344,38*68 $GLGSA,A,3,68,69,79,83,85,84,77,78,70,86,,,01.4,00.7,01.2*1C $PORZD,A,002.7*39 $GPZDA,235959.00,30,06,2015,00,00*64 $GPGGA,00.00,5158.9396,N,00913.5513,E,1,10,00.7,119.5,M,47.2,M,,*52 $GPRMC,00.00,A,5158.9396,N,00913.5513,E,00.00,144.5,010715,,,A*5D $GPGSV,1,1,04,33,26,210,00,37,29,164,00,39,29,160,00,40,17,127,00*76 $GLGSV,3,1,10,68,36,066,46,69,74,335,40,70,26,270,49,77,17,018,36*63 $GLGSV,3,2,10,78,34,075,43,79,18,125,41,83,06,190,39,84,43,230,42*6F $GLGSV,3,3,10,85,42,304,46,86,07,344,37*64 $GLGSA,A,3,68,69,79,83,85,84,77,78,70,86,,,01.4,00.7,01.2*1C $PORZD,A,002.7*39 $GLGBS,00.00,2.0,1.8,5.2*51 $GPZDA,00.00,01,07,2015,00,00*66 $GPGGA,01.00,5158.9396,N,00913.5513,E,1,10,00.7,119.5,M,47.2,M,,*53 $GPRMC,01.00,A,5158.9396,N,00913.5513,E,00.00,144.5,010715,,,A*5C $GPGSV,1,1,04,33,26,210,00,37,29,164,00,39,29,160,00,40,17,127,00*76 $GLGSV,3,1,10,68,36,066,44,69,74,335,39,70,26,270,47,77,17,018,34*63 $GLGSV,3,2,10,78,34,075,42,79,18,125,39,83,06,190,37,84,43,230,41*6C $GLGSV,3,3,10,85,42,304,44,86,07,344,36*67 $GLGSA,A,3,68,69,79,83,85,84,77,78,70,86,,,01.4,00.7,01.2*1C $PORZD,A,002.7*39 $GPZDA,01.00,01,07,2015,00,00*67 RestartKÕÎ$GPGGA,00.00,.,N,0.,E,0,,,-18.0,M,18.0,M,,*5E $GPRMC,00.00,V,.,N,0.,E,00.00,000.0N*46 $GPGSV,1,1,00*79 $GLGSV,1,1,00*65 $GPGSA,A,1,,,*1E $PORZD,V,999.9*2B $GPGBS,00.00,,,*6F $ALVER,NVS,CSM23,0207*72 $POTST,ID,0268501855,ANT,1,RFG,0,RFR,0*3E $GPGGA,01.00,.,N,0.,E,0,,,-18.0,M,18.0,M,,*5F $GPRMC,01.00,V,.,N,0.,E,00.00,000.0N*47 $GPGSV,1,1,00*79 $GLGSV,1,1,00*65 $GPGSA,A,1,,,*1E $PORZD,V,999.9*2B $GPZDA,01.0000,00*67 $GPGGA,02.00,.,N,0.,E,0,,,-18.0,M,18.0,M,,*5C $GPRMC,02.00,V,.,N,0.,E,00.00,000.0N*44 The module restarted itself when the leap second occurred. 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. -- vbradio.wordpress.com ___ 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] Trimble 65256 OCXO info?
Bob, I've used one for a simple 10 Mhz ref. They are 12 V, and indeed the VFC is +2.5V If you hold the OCXO upside down, the 2 pins at the top are GND and +12V Bottom 3 Pins - 10 Mhz, unknown and VFC Frits W1FVB On 09/06/2015, Bob Stewart b...@evoria.net wrote: Does anyone have any information about the Trimble 65256 OCXO? I bought one recently and hooked it up to 12V per the vendor. (Yeah, I know.) Although it worked, it set off such a stench: the usual electronics burning up, give you a sore throat smell. So, I got a replacement and same thing. For fun, I hooked it up to +5V. It seems to work, it drives the counter, but I haven't measured the output waveform yet. So, does anyone know whether these are +12V devices, +5V, or something else? The VRef output was somewhere around +2.5V, IIRC. Bob - AE6RV ___ 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. -- vbradio.wordpress.com ___ 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] Small time server for mobile use.
I've noticed that on my RPI as well, Time stability improved greatly when connected to a simple and well cooled 7805 voltage regulator. My RPI (GPS PPS) runs at about +/- 2 uS on a somewhat medium CPU sytem load. Good enough for my needs. Frits On 5/24/15, Attila Kinali att...@kinali.ch wrote: On Wed, 13 May 2015 09:07:44 -0500 bownes bow...@gmail.com wrote: For the advocates of RPi solutions, I put about half a dozen in to support some non mission critical infrastructure about a year ago. We are using them for for logging, reading QR codes, running a vending machine, kiosk web browsers, and similar tasks. In short, nothing requiring heavily lifting. I've been incredibly dissappointed in the results. Well over half of them have needed replacement and not a one runs reliably. They need rebooting at intervals from hours to a few tens of days to recover from total lock up. The problem is not environmental, power or SD cards. Do you know what the problem is? I know that the RPI has pretty cheap design (like most of these super-cheap SoC boards) and does suffer from a few problems. The most common one is under-designed power supply. Together with the ultra-cheap wall-wart supplies mostly used results in a quite decreased MTBF due to spikes/drops on the power rails (BTW: soekris suffers from that too, just that a better wall-wart supply doesn't help). Depending on the environment, in which those boards are run, overheating might also be a problem. Other than that, i am not aware of any software or hardware issues that would cause the RPI, or any other board, to run unreliably. Attila Kinali -- _av500_ phd is easy _av500_ getting dsl is hard ___ 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. -- vbradio.wordpress.com ___ 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] Beaglebone NTP server
Thanks for pointing this out David, Compiling an new kernel was holding me back. I followed your instructions and everything works beautiful. The PI that is running the PPS timekeeping with NTP is serving as a VLF receiver as well. Taxing the poor CPU, but with kernel PPS support the NTP daemon has become way happier! (see attachment) 73, Frits W1FVB On 12/8/14, David J Taylor david-tay...@blueyonder.co.uk wrote: From: Chris Albertson Really? The PPS to GPIO interface is handles in user space? It is not interrupt driven? In the implementations I've seen the critical real time work is done inside the PPS interrupt handler and then of course ntpd runs in userland and can take as much time as it needs = Folkert's solution was very helpful, but there is now kernel-mode PPS support for a GPIO pin the current Raspberry Pi Linux - see: http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html#easy I'm running that on a couple of systems here. Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ 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. -- vbradio.wordpress.com ___ 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] Beaglebone NTP server
Hi David, Yes, You mean the hourly dips? That is caused by the the VLF receive software that is running on the same PI. It makes hourly recordings of DC to 24 Khz with a USB soundcard. The CPU is running at max capacity most of the time. Perhaps it is now time for a dedicated PI, that only has the task of playing Stratum One. If anyone is interested: https://pivlf.wordpress.com/ 73, Frits W1FVB On 12/9/14, David J Taylor david-tay...@blueyonder.co.uk wrote: Thanks for pointing this out David, Compiling an new kernel was holding me back. I followed your instructions and everything works beautiful. The PI that is running the PPS timekeeping with NTP is serving as a VLF receiver as well. Taxing the poor CPU, but with kernel PPS support the NTP daemon has become way happier! (see attachment) 73, Frits W1FVB == Oh, yes! That's much better, Frits! Delighted to have helped! (Although it now shows up an hourly periodicity - any idea what might be causing that?) 73, David GM8ARV -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ 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. -- vbradio.wordpress.com ___ 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] 1900kHz radiolcation testing on east coast US?
Recorded last night. Audio bandwidth is a few kHz, but as mentioned before the signal is about 20 kHz wide. https://www.dropbox.com/s/bnp8zcpgw86l6ww/1910.wav?dl=0 This morning (14:21 UTC) nothing is heard Frits W1FVB Whitefield, NH On 12/8/14, John C. Westmoreland, P.E. j...@westmorelandengineering.com wrote: Hello, Can someone please post a *.wav file of what it sounds like provided you have an SDR set-up? If you need someplace to post - please send the file to me offlist and I'll put it on either an ftp site or http. I am not so convinced what I saw wasn't noise or some stations from China transmitting - which I have seen in the 160m band lately. I got an AM band tonight also that was stomping all over ~ 3.87 MHz. Thanks! John AJ6BC On Mon, Dec 8, 2014 at 2:30 AM, Graham planoph...@aei.ca wrote: Radiolocation may be a bit misleading. Some first thought that this was CODAR but it is not, at least not what I am familiar with but it may be another variation of an ocean surface wave RADAR type of system but it is certainly not like one I have heard before. cheers, Graham ve3gtc On 2014-12-07 20:03, paul swed wrote: Not aware of any testing plus it makes no sense these days. LORAN long ago abandoned and was in that range and Loran C in the US dead. UrsaNav has been quite for quite a while. Regards Paul WB8TSL On Sun, Dec 7, 2014 at 7:09 PM, Bob Camp kb...@n1k.org wrote: Hi 120 Hz sub structure suggests a (much lower power) switching power supply run amok. I certainly would not design a system that would have virtually no immunity to power line noise . Bob On Dec 7, 2014, at 6:28 PM, Tim Shoppa tsho...@gmail.com wrote: Would any time-nuts know of radiolocation-type testing going on, on east coast of US, maybe around Maine? There is a very strong wideband signal on 1900-1920kHz, with a 120Hz substructure and a 4Hz rep-rate, likely megawatt power range. Sound sample (recorded with 2400Hz receiver bandwidth, although the whole signal is far far wider bandwidth) at http://www.trailing-edge.com/1910-intruder.wav Pics of the waveform at http://www.trailing-edge.com/ 1910-intruder-1.png and zoomed in at http://www.trailing-edge.com/1910-intruder-2.png Tim N3QE ___ 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. ___ 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. -- vbradio.wordpress.com ___ 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] 1900kHz radiolcation testing on east coast US?
John, On 12/8/14, John C. Westmoreland, P.E. j...@westmorelandengineering.com wrote: Hello Frits, Interesting. A little different than what I heard - but of course depends on the bandwidth somewhat. I think my bandwidth was set at about 8 Khz How many dB was this up from the noise floor? Or - what is the signal level of the received signal? What modulation did you try to decode or did you just set it wide-AM? I've build a down converter in my old IC-735 and have about 22 Khz of spectrum to look at at once. Using Xlinrad as the SDR. Had the audio passband in Double Side Band mode.. 4 kHz below and 4 kHz above the center frequency. Signal strength in Linrad wasn't calibrated , but on the icom analog meter S9+30 dB I saw something like I mentioned around 1.915 MHz. It then dropped down to around 1.913 MHz - and then it went away. I did make a recording - but I didn't get the best part due to the signal moving down a bit - from 1.915 to 1.913 MHz. Thanks, John AJ6BC 73 Frits W1FVB -- vbradio.wordpress.com ___ 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] 1900kHz radiolcation testing on east coast US?
I'm hearing the same signal in northern New Hampshire. Very strong 73, Frits W1FVB On 12/8/14, Bob Camp kb...@n1k.org wrote: Hi 120 Hz sub structure suggests a (much lower power) switching power supply run amok. I certainly would not design a system that would have virtually no immunity to power line noise . Bob On Dec 7, 2014, at 6:28 PM, Tim Shoppa tsho...@gmail.com wrote: Would any time-nuts know of radiolocation-type testing going on, on east coast of US, maybe around Maine? There is a very strong wideband signal on 1900-1920kHz, with a 120Hz substructure and a 4Hz rep-rate, likely megawatt power range. Sound sample (recorded with 2400Hz receiver bandwidth, although the whole signal is far far wider bandwidth) at http://www.trailing-edge.com/1910-intruder.wav Pics of the waveform at http://www.trailing-edge.com/1910-intruder-1.png and zoomed in at http://www.trailing-edge.com/1910-intruder-2.png Tim N3QE ___ 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. -- vbradio.wordpress.com ___ 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] CW12-TIM
Sounds like a great idea, Maybe I can venture beyond the Raspberry Pi with NTP and PPS GPS ..how far does the rabbit hole go? Frits On 7/14/14, Scott Newell newell+timen...@n5tnl.com wrote: At 04:09 PM 7/14/2014, saidj...@aol.com wrote: I think we need to have a Time Nuts For Dummies article written that takes J. Vig's writing and puts it into much less of a technically rigorous And maybe a recommended list of simple experiments that new time-nuts can perform. -- newell N5TNL ___ 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. -- vbradio.wordpress.com ___ 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.
