[time-nuts] GPS receivers and the Leap Second

Hi! In my network I have 2 Meinberg M200 clocks and 4 other GPS receivers (1 Sure GPS Evaluation board, 2 Garmin 18 LVC and a uBlox EVK-6N). I recorded the GPS timecode strings across 00:00 UTC to see how they would react to the leap second: Sure GPS timecode="$GPGGA,235955.000,4055.2138,N,00829.

Re: [time-nuts] Legal Time dissemination

Hi David! On 5 June 2013 06:58, David J Taylor wrote: > > Miguel, > > I notice a step in the blue (ntp02) graph in: > > > http://www.flickr.com/photos/**miguelbarbosagoncalves/**8955346508/ > > and I think in the red (ntp04) grap

Re: [time-nuts] Legal Time dissemination

Hi Chris! I have a week's worth of data now... Take a look at these graphics http://www.flickr.com/photos/miguelbarbosagoncalves/8955346508/ and http://www.flickr.com/photos/miguelbarbosagoncalves/8955346522/ One of them shows is the plot of the loopstats of my stratum 1 server. The other one s

Re: [time-nuts] Legal Time dissemination

Two mistakes that I spotted after clicking send... On 5 June 2013 01:57, Miguel Barbosa Gonçalves wrote: > Hi Chis! > I meant Chris of course... sorry about that! > > I have a week's worth of data know... Take a look at the attached graphics. > Not know but now of

Re: [time-nuts] Legal Time dissemination

Hi Jason! On 28 May 2013 13:56, Jason Rabel wrote: > I would do a traceroute and see if the path is the same going to both > servers, that can eliminate some variables. > They are on the same network and the path is the same. > Beyond that it would take some detective work on their side. It c

Re: [time-nuts] Legal Time dissemination

On 28 May 2013 14:10, Gabs Ricalde wrote: > That looks like a server in an room with unstable temperature. Try > graphing the server's frequency (ntpq rv or ntpdc loopinfo/kerninfo if > enabled on the server), a rising frequency will correlate with a > positive offset if that is the case. > Hi!

[time-nuts] Legal Time dissemination

Hi! Lately I've been using the two stratum 2 servers our national observatory provides to the public mainly as backup for my GPS based local NTP servers. I've always found odd that one of them exhibited an erratic behaviour when compared to the other one. I decided to use ntpdate on one of my st

Re: [time-nuts] NTP Clock suggestions?

On 27 May 2013 18:11, David J Taylor wrote: > From: Miguel Barbosa Gonçalves > [] > > Just checked the Windows taskbar clock and it has a 1 second delay... > > At work I use Windows but use Mac OS X at home... but I am looking for a > solution for the Windows platfo

Re: [time-nuts] NTP Clock suggestions?

On 27 May 2013 16:22, Chris Albertson wrote: > On Mon, May 27, 2013 at 7:56 AM, Miguel Barbosa Gonçalves > wrote: > > > > > Good joke :-) I imagine the electricity bill at the end of the month. > > > > I would like to have a clock sync with my super precise str

Re: [time-nuts] NTP Clock suggestions?

Hi Bob! On 27 May 2013 14:56, Bob Camp wrote: > Hi > > Correct answer: > > I don't think there is such a beast. Once you get away from the radio > controlled (WWVB etc) clocks the cost goes up quickly. > I don't understand why a microprocessor with an Ethernet controller and a 7 segment display

[time-nuts] NTP Clock suggestions?

Hi! I was wondering if anyone knows about a not so expensive wall digital clock that gets its time from an NTP server... TIA, Miguel ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/tim

Re: [time-nuts] Trimble Acutime Gold PPS

No dia 19/05/2013, às 22:44, Mike S escreveu: > On 5/19/2013 5:03 PM, Miguel Barbosa Gonçalves wrote: > >> - Port A (T+) to R+ on the converter >> - Port A (T-) to R- on the converter >> - PPS+ to T+ on the converter >> - PPS- to T- on the converter >> &

[time-nuts] Trimble Acutime Gold PPS

Hi! I am struggling trying to convert my Acutime's PPS signal from RS422 to RS232 for NTP use. I am using this converter: http://www.dpieshop.com/quatech -sscvt500n-rs232-to-rs422485-serial-converter-p-282.html and I connected - Port A (T+) to R+ on the converter - Port A (T-) to R- on the conve

Re: [time-nuts] NTP, PPS and < 10 us offsets

On 16 May 2013 11:12, Miguel Barbosa Gonçalves wrote: > On 16 May 2013 04:14, Chris Albertson wrote: > >> On Wed, May 15, 2013 at 12:43 PM, Miguel Barbosa Gonçalves >> wrote: >> >> >> > >> > I've reconfigured the antenna to output only NM

Re: [time-nuts] NTP, PPS and < 10 us offsets

Forgot to add the clockstats file 56428 27303.926 127.127.20.0 973a 0.07077 0.0 0.000235362 0.03815 56428 27319.926 127.127.20.0 973a 0.06602 0.0 0.000235362 0.03815 56428 27335.926 127.127.20.0 973a 0.06115 0.0 0.000235362 0.03815 56428 27351.926 12

Re: [time-nuts] NTP, PPS and < 10 us offsets

On 16 May 2013 04:14, Chris Albertson wrote: > On Wed, May 15, 2013 at 12:43 PM, Miguel Barbosa Gonçalves > wrote: > > > > > > I've reconfigured the antenna to output only NMEA sentences (and I also > use > > the PPS) and NTP works fine but suddenly witho

Re: [time-nuts] NTP, PPS and < 10 us offsets

Hi! Thank you for your input. Yes, I've set minpoll and maxpoll to 4 yet the system corrects the offset slowly during the calibration interval that starts I believe at 8 seconds (2^3) and stops at 256 seconds (2^8) even though I've set min and maxpoll. Even considering this situation I am going

[time-nuts] NTP, PPS and < 10 us offsets

Hi! I am trying to figure out why NTP takes so long to react to oscillator changes... I want it to track the PPS from a Trimble Acutime as closely as possible. When checking ntptime on startup I see that the NTP daemon is using PLL and starts the adjustment interval at 8 s. It then increases to 1

Re: [time-nuts] Imagery position accuracy

On 07/05/2013, at 01:20, Chris Albertson wrote: > On Mon, May 6, 2013 at 3:38 PM, Miguel Barbosa Gonçalves wrote: > .. >> >> You'll have to make the driver talk to the configuration / monitoring port >> (port B) as the timing port (port A) does not accept commands.

Re: [time-nuts] Imagery position accuracy

On 6 May 2013 03:21, Chris Albertson wrote: > After you get the position, how does the OP (or anyone else) put the > location data into the Trimble GPS receiver so that it can be used in > the time solution. This is for NTP remember. > Hi Chris! You can input the information through the Window

Re: [time-nuts] GPS position survey

Hi Chris! On 06/05/2013, at 01:21, Chris Albertson wrote: > If you are talking about using this with NTP. I don't know if you > have a choice. The Trimble receiver is going to do whatever it is > going to do when you power it up.Software running on a PC can > perform a 24 hour survey and r

Re: [time-nuts] GPS position survey

On 5 May 2013 12:28, Sarah White wrote: > > I myself did a sampling over a period of 1 million samples > (actually, it was a value of 2^20, not exactly 1 "million") > quickest it could have completed such a survey is 12+ days > > ... However, I had "masks" set for elevation, signal, etc. > (result

Re: [time-nuts] nanobsd conf

On 27 April 2013 14:17, Mark C. Stephens wrote: > Hi All, I am trying to get my head around building a nanobsd for some HP > thinclients to run as stratum 1 servers. > > If you have the time, please send me an example conf file for "sh nanobsd.sh > -c myconf.nano" > > I am unsure of how to add m

Re: [time-nuts] GPS position survey

On 5 May 2013 20:18, Chuck Forsberg WA7KGX N2469R wrote: > When doing a position survey, does Lady Heather have to be running? > Or does the Thunderbolt do it by itself? I don't know about Thunderbolt but on my Acutime Gold the Windows software sends the restart survey command to the antenna and

Re: [time-nuts] GPS position survey

On 5 May 2013 11:51, Poul-Henning Kamp wrote: > In message <8311230247672528820@unknownmsgid>, > =?ISO-8859-1?Q?Miguel_Barbosa_Go > n=E7alves?= writes: > > >This receiver has the possibility of averaging it's position before > >entering what Trimble calls the overdetermined clock state. The > >de

[time-nuts] GPS position survey

Hi fellow time nuts! I've recently bought a Trimble Acutime gold that will be used as a reference clock for a NTP server. This receiver has the possibility of averaging it's position before entering what Trimble calls the overdetermined clock state. The default is to average the position with 200

[time-nuts] Trimble Resolution T

Hi! I'm looking at the Resolution T from Trimble (http://www.trimble.com/timing/resolution-t.aspx). Does anyone here connected it successfully to a computer? Are the voltages compatible with RS232 or do I need some converter? Thanks! Regards, Miguel ___

Re: [time-nuts] GLONASS receiver

On 5 August 2012 22:45, Bob Camp wrote: > Hi Hi Bob! > What sort of accuracy do you need? If 1 ms is "good enough", then indeed a > GPSDO I was looking at http://www.jrmiller.demon.co.uk/projects/ministd/frqstd.htm and apparently this might work. I could connect this to one of my servers and