Regarding the temperatur sensitivity of the raspberrypi, i have replaced the xtal on several if them by a tcxo. This a hell of a difference.
Kind regards, Stijn Nestra Verstuurd vanaf mijn iPhone > Op 25 apr. 2020 om 09:47 heeft David J Taylor via time-nuts > <[email protected]> het volgende geschreven: > > From: Andreas Kempe > > Hello everyone, > > I want to build an affordable quality time source for my computer > club. I've been toying with the idea of using an oven controlled > oscillator from Ebay for getting a reasonable (0,5 ppm frequency > stability) 1 PPS signal and a cheap GSP chip with UART for syncing the > time. I was thinking of running this on a Raspberry Pi with FreeBSD > and its gpiopps driver. > > Is this a reasonable setup for an affordable NTP server? > > Cordially, > Andreas Kempe > _______________________________________________ > > Andreas, > > Here's an example of a simple device you can build: > > https://www.satsignal.eu/ntp/Raspberry-Pi-quickstart.html > > It's quite temperature sensitive, so either put it where the temperature is > stable, or use ntpheat to keep the CPU at a much more constant temperature: > > http://www.satsignal.eu/ntp/Raspberry-Pi-ntpheat.html > > With those recommendations, and noting the delays in RPi I/O (at least in the > earlier RPi cards where Ethernet is over USB), I would suggest that an OCXO > is overkill. No reason to deviate from the Raspbian OS. > > You can gauge the performance from various Raspberry Pi devices here: > > http://www.satsignal.eu/mrtg/performance_ntp.php > > Cheers, > David > -- > SatSignal Software - Quality software for you > Web: http://www.satsignal.eu > Email: [email protected] > Twitter: @gm8arv > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
