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

[Joe Bennett]

Would you care to share what you did? I found this online. It looks interesting. Maybe nothing more than a fun project. Seems to be a lot of debate on how effective it is. I'm a novice at this stuff so I don't have any value to add on it's effectiveness... 

https://raspberrypi.stackexchange.com/questions/74482/switch-out-the-x1-oscillator-on-a-rpi-2-3

I may play with the python script that was in an earlier post. Just need to find a good way to insulate the PI. Bubble wrap just seems to not be a good solution. Sounds like a static collector to me.... ???




-- Joe 
KA3NAM


Apr 25, 2020, 3:39 AM by stijn at pe1rks.nl:

> 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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>
>
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