Yo Hans! On Wed, 21 Jan 2026 15:31:28 +0100 Hans Mayer <[email protected]> wrote:
> Sorry for late answer but my e-mail was rejected because it has
> exceeded the 400kB limit.
Take that as a string hint you are doing something wrong.
> i used euref-ip.net mountpoint TRF200AUT0
> it is a RTCM3.3 source
Which messages?
> and it is about 40.09 km away.
Ugh. That will not work. I find more them 2km and the benefits are
small.
> > many things. The "offset" just means that your PC clock has drifted
> > and the PPS is trying to pull it back.
>
> Offset from the situation before I activated the ntrip source.
How do you know that? You have a Caesium clock?
> The clock of the server is disciplined by the PPS1 signal of ZED-F9P
Yes.
> > Before you continue, you need to setup, and use ntpvis.
>
> ntpvis was already installed.
> Here the result from ntpviz
Uh, where is the rst of it? Temperatures, etc.
With a base 40 km away, I'm surprised it is that good.
> > Yeah, jitter goes up when you restart. You want the best stability,
> > don't touch anything!
> This I agree. But in that case it's not going back until I deactivate
> the ntrip source.
Yes, your obviously bad NTRIP source.
> I understand.
Sadly I do not agree.
> So we can agree that a ntrip source can have some effect for SHM(0)
> obviously. But we don't know why.
Of course it has an effect. The affect you want is for a more stable
PPS. But, you are getting a less stable PPS due to a base station that
is too far aawy. So now you PPS is jumping around more than your system
clock!
"offset" is just the measure of how much they disagree. It does not
tell you which is better. But in your case, with a 40 km baseline, I
tell you the NTRIP data is hurintg more than helping.
RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
[email protected] Tel:+1 541 382 8588
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"If you can't measure it, you can't improve it." - Lord Kelvin
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