[time-nuts] Re: TimeProvider 2700 PTP UTC offset issue.

Hi Andrew, have you checked the PTP-Messages themselves? There is a field currentUtcOffset in the PTP announce message used to transfer leapsecond info. If thats 35, then it seems like a firmware issue. Regards Markus Am 25.06.2022 um 10:30 schrieb Andrew Back via time-nuts: > Hoping that

[time-nuts] Re: Knowing when the PPS signal is locked to the satellite.

Hi Dave, the UBX-NAV-STATUS and UBX-TIM-TP messages should give you a good indication. Regards Markus > I am using a NEO-6M to provide a PPS signal for an experiment but I > need to know when it is locked or not. > > Does anyone know if there is a way to find out from either the NMEA > data

[time-nuts] Re: Can the ADEV of a GPSDO output ever be lower than the minimum of the ADEV of the internal oscilator and the ADEV of the GPS PPS?

t; If you have a FS740 and measure it’s performance …. you likely will > take anything the manual says a lot less seriously ….. Their ADEV > performance in the real world is a bit underwhelming. > > Bob > >> On May 2, 2022, at 1:42 AM, Markus Kleinhenz via time-nuts >>

[time-nuts] Re: Question about GPS 1PPS ADEV

Hello Matthias, > Of course curiosity got the better of me. I switched the GPSDO to hold-over > and recorded about 4000 seconds of data. Result is attached. BTW I terminated > the experiment after the temperature compensation kicked the DAC one LSB > down. > I am quite pleased with the

[time-nuts] Re: GPSDO Control loop autotuning

> >> Any hints? >> >> As soon as I see it sort of working in Matlab, I want to test it on my >> GPSDO. Especially the fact that I have an estimate of the timing >> error (the >> GPS module announces this value via a special telegram!) I find very >> am

[time-nuts] Re: 100 MHz Low Phase Noise Mobile GPSDO/GNSSDO?

Hi Carsten, Jim, Am 19.04.2022 um 18:51 schrieb Carsten Andrich: > Hi Markus, Jim, > > thank you for your responses! > > On 19.04.22 11:53, Markus Kleinhenz via time-nuts wrote: >> I believe you will have a hard time finding a COTS solution that fits >> most of y

[time-nuts] Re: 100 MHz Low Phase Noise Mobile GPSDO/GNSSDO?

Hello Carsten, thats quite the set of requirements you got there. I believe you will have a hard time finding a COTS solution that fits most of your requirements. You will likely have to split your signal chain into multiple devices: 1. UBlox ZED-F9T based GPS-Receiver with 1PPS out 2.

[time-nuts] Re: GPSDO Control loop autotuning

Hi Tobias, Am 11.04.2022 um 13:33 schrieb Pluess, Tobias via time-nuts: > Hi Markus, > > Thanks for your hints. That's actually what I meant. One could use the > Kalman filter to "improve" the noise of the 1PPS signal being measured, and > then use the observed output from the Kalman filter as

[time-nuts] Re: GPSDO Control loop autotuning

Hi Tobias, I was looking into Kalman filters as well, albeit some time ago. But I think i got some pointers that can put you on your path. 1. The Kalman filter is an estimator not a controller. It gives you an estimate of your current system state but no controll law. 2. Time and the Kalman

Re: [time-nuts] Ublox timepulse

Hi Christophe, after having a quick look at the Ublox Protocol Spec. and testing on a M8T it seems the only solution will incorporate some parsing of messages. The UBX-CFG-TP5 message allows for a user delay but only about +-2s and an alignment to top of second. You could however parse the