[ntp:questions] Tobit LAN!Time DCF77 receiver not working
David Lord
snews at lordynet.org
Thu Dec 24 16:45:44 UTC 2009
Marc-Andre Alpers wrote:
> I looks very good.
>
> remote refid st t when poll reach delay offset jitter
> ==============================================================================
> LOCAL(0) .LOCL. 10 l 12 64 377 0.000 0.000 0.001
> *SHM(0) .DCF. 0 l 10 64 377 0.000 9.029 1.039
> europium.canoni 193.79.237.14 2 u 18 64 377 44.718 -10.546 2.068
> s1.uruz.org 82.96.64.2 2 u 26 64 377 40.036 -4.958 3.274
> sun.raveisking. 248.28.159.255 2 u 30 64 377 32.395 27.763 3.149
> simbx01.sixxs.n 8.44.164.161 3 u 22 64 377 53.903 -32.008 3.638
You might want to adjust the flag for refclockd2 or SHM
timings to allow for latency from the average rs232 timing
error and propogation delay.
It's very hit and miss from the servers you list above but
here I just chose to be about midway between my best
internet sources which are within 1ms or so on a good day.
Using a GPS is best but I've only a single serial port
usable (m/b has 1x backpanel + 3x headers but I don't want
to shutdown just to add the extra port connectors).
I've fudged the SHM with
"fudge 127.127.28.0 time1 0.024550 refid MSFa"
"ntpq -p" just now shows -1.834 and +1.180 for
two servers and -11.955 for another, with two local
peers as +0.167 and -0.208.
The local peers show their internet servers as:
(1) +0.098, -0.063, +0.148 and -79.556 :-)
(2) +0.053, +0.173, -0.592 and -8.639
There is a definite drift with both temperature change
and weather conditions but I don't have anything setup
to log temperature, never mind cloud cover, RH etc.
Yesterday the valley was clear with a few high clouds
but today it's 100% cloud cover down to ground level.
David
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