[time-nuts] Re: Ublox M6T -M8T

Rich, stand by. I've been doing a *lot* of testing with higher-speed pulserates on the u-blox F9T/M8T/M9N (as high as 20+ MHz) and will be ready to report some results in a week or two, I hope. There are some interesting findings. And that testing underlies a new TAPR project I'm working on;

[time-nuts] Re: Ublox M6T -M8T

Hi There are a number of threads on the uBlox receivers. Quick summary: All of the outputs from the typical examples are run with a “drop a pulse / add a pulse” approach to steer them to the correct frequency. If you are after a “clean” output for some sort of gear (like a synthesizer) … not so

[time-nuts] Re: Ublox M6T -M8T

Hi Rich, I'm using a LEA-M8T in a GPSDO project. I've gathered a bit of experience with the M8 timing receivers over the past two or three years. Both timepulse outputs can be programmed to any frequency and duty cycle you like, 10kHz is certainly not a problem. However, some things to consider

[time-nuts] Re: Ublox M6T -M8T

Yes, we did, and learned, that the device -- the ublox6 --  forgets the the program very fast, thus we added one arduino, which loads the program into the ublox at every new turn on. By using low output frequency -- 10kHz -- the jitter is low, at higher output frequency the jitter is getting

[time-nuts] Re: Ublox M6T -M8T

Do you mean "even submultiples"? ie. even division ratios. Andy www.g4jnt.com On Sat, 28 May 2022 at 21:11, Matthias Welwarsky via time-nuts < time-nuts@lists.febo.com> wrote: > Hi Rich, > > Only frequencies that are even multiples of the internal crystal frequency > (48MHz) are "clean". Ever

[time-nuts] Re: Ublox M6T -M8T

Matthias Welwarsky said: > Only frequencies that are even multiples of the internal crystal frequency > (48MHz) are "clean". Everything else is, as Bob puts it, "drop a pulse, add a > pulse" approximations. However, that's normally easy to filter. How clean? It's a GPS, not a GPSDO, so I'd ex

[time-nuts] Re: Ublox M6T -M8T

I just come accross this application note directly from u-blox. https://content.u-blox.com/sites/default/files/products/documents/Timing_AppNote_%28GPS.G6-X-11007%29.pdf They evaluated 8 kHz ou