Hi Michael, thanks for the reminder about your slides! Your page 4 has the two setups. I think you are right in that the F9T doesn't seem to take an external receiver clock (even if working with the bare part, not the RCB-board). (FWIW, AFAIK the not-so-low-cost septentrios use the left external receiver clock scheme, while Dicom GTRs use the right - both in the 15k cost range)
Did you use an external TIC (like the TICC?) - to get lower than the 8ns granularity of the TIMEMARK? If I understand CGGTTS the TIC and sawtooth-correction are used to provide one single time-offset value into the CGGTTS file, for each 780s=13 min satellite track observed? https://tycho.usno.navy.mil/cggtts.html is that correct? Can the same TIC-based sawtooth correction work for 30s RINEX data instead? If gpsd can produce dual-frequency RINEX from the F9T, then the new (software)part needed is the sawtooth-correction at 30s intervals applied to the raw RINEX from the F9T. https://gpsd.gitlab.io/gpsd/ppp-howto.html Anders On Sun, Sep 22, 2019 at 3:00 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 > > > 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 > > _______________________________________________ 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.