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

[Andreas Kempe]

On Sat, Apr 25, 2020 at 03:19:54AM -0700, Hal Murray wrote:
> 
> David Taylor said:
> > 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. 

Deviating from Raspbian isn't really anything other than personal
taste. I happen to like the BSDs. I'm not opposed to Raspbian as such
if it were to simplify things.

> 
> That's an important point.  Thanks David.  I'm embarrassed that I didn't 
> mention it.
> 
> On Pi 2 and Pi 3, the Ethernet is on USB which adds a layer of jitter to the 
> timing you can get using NTP.
> 

Thank you both for this important insight! The only reason I really
mention a Raspberry Pi is because my originial idea was to feed the
PPS signal into a GPIO pin and the Raspberry is very easy to get a
hold off and has GPIO pins.

Cordially,
Andreas Kempe
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