[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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