I have uploaded the paper that appears in the conference proceedings: http://www.openttp.org/downloads/Multi-GNSS_IFCS-EFTF_2019_paper.pdf
Cheers Michael On Sun, Sep 22, 2019 at 9:49 AM Michael Wouters <michaeljwout...@gmail.com> wrote: > > 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.