> From: Attila Kinali <[email protected]> > Basically, all you have to do is use an SBC that runs linux and has > a GPIO with an interrupt to act as a PPS input. Attach a GPS receiver > and you are almost done. The cheapest option are probably the i.MX233 > based ones (go as low as €20).
Thank you, Attila, this sounds like the way to go - perhaps I can repackage this solution in a smart attractive enclosure and market it as a high performance product. I was a bit behind the curve on recent developments - do you have a suggestion for the best linux running SBC and cheap GPS suitable for this? >> I am not measuring any frequencies - the whole device runs synchronously >> hard- >> locked to GPS time when it is available and freewheeling when not. > > You should have a control loop somewhere, which explicitly or implicitly > estimates the frequency of the TCXO. > The time-nuts archives are full with discussions how to do such > control loops and improve hold over performance. Though there > weren't many in the last 2-3 years. John Vigs tutorial is also > a good start. OK, so I need to introduce additional TCXO and a control loop to improve the holdover performance? Thanks Leo _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
