On 25.04.2020 12:19, 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.
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.
What is considered as too much jitter in this case? I see this in my
home setup:
remote refid st t when poll reach delay offset
jitter
===============================================================================
SHM(0) .SHM. 0 l 34 64 377 0.0000 -57.9552
1.6973
*SHM(1) .GPSD. 0 l 13 16 377 0.0000 -0.0016
0.0004
+192.168.3.246 .PPS. 1 u 17 64 377 0.3834 -0.0064
0.0149
-192.168.3.247 .PPS. 1 u 18 64 377 0.3545 -0.1689
0.0069
+192.168.3.102 .PPS. 1 u 15 64 377 0.1966 -0.0729
0.0187
Server 192.168.3.246 is RPi3.
Petr Titera
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