[time-nuts] NTP server using an OCXO, GPS chip and Raspberry Pi

[Stijn Nestra]

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 <time-nuts at lists.febo.com> 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: david-taylor at blueyonder.co.uk
> Twitter: @gm8arv 
> 
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