Hello Anders, We did some work on single-frequency time-transfer with the F9P earlier this year which we presented at IFCS-EFTF in April. http://www.openttp.org/downloads/Multi-GNSS_IFCS-EFTF_2019.pdf There's a paper too, which I should upload. In short, the F9P is very suitable for code-based time-transfer, and we will be using it , or the F9T, in the next iteration of our time-transfer system.
But, I don't see how you can feed an external 10 MHz and 1 pps to the F9T. There don't appear to be any inputs for this on the chip. The TIMEMARK inputs only seem to be useable for measurements. Have I missed something? Regards Michael On Sun, 22 Sep 2019 at 12:30 am, Anders Wallin <anders.e.e.wal...@gmail.com> wrote: > Hi all, we are testing an uBlox F9T (RCB-F9T timing-board) for the past few > days. Small uBlox puck antenna in a not-so-great location. > I get an ADEV of 3e-8/tau long-term (see pictures or blog) > > Through the UART there are lots and lots of settings to tweak with the > uBlox software - I am wondering if anyone figured out optimal settings for > stationary operation and best stability when the pulse1/pulse2 outputs are > configured for 1PPS and 10 MHz. Is it using just GPS (or multi-GNSS?), dual > or single-frequency, as the default setting? > > Also, it seems that on 10MHz there is dithering (8ns granularity?) - is > there any simple way to generate a round-number out of the uBlox, and use a > (simple) multiply/divide to get dithering-free 10MHz? > > we made a carrier-board for the RCB-F9T with an USB/UART conversion and > buffered dual BNC outputs for pulse1/pulse2 - this might be published > later... > > Further down the road, if the F9T really can do dual-frequency > observations, and either the receiver clock 1PPS measured (TICC?) against > an external 1PPS, or the entire receiver clocked from external 10M/1PPS - > and dual-frequency RINEX generated from this - then there seems to be an > obvious opportunity for making a low-cost dual-frequency time-transfer > setup? Or am I missing something? > PPP with F9T seems to be possible: > https://gpsd.gitlab.io/gpsd/ppp-howto.html > > thanks, > Anders > board https://www.u-blox.com/en/product/rcb-f9t-timing-board > antenna https://www.u-blox.com/en/product/ann-mb-series > blog http://www.anderswallin.net/2019/09/ublox-f9t-test/ > > [image: uBlox_oadev_tdev.png] > [image: uBlox_F9T_timeseries.png] > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.