[ntp:questions] dcf77 time synchronization problem
Ulrich.Windl at RZ.Uni-Regensburg.DE
Fri Aug 13 11:20:54 UTC 2010
<Wolfgang.Hennerbichler at ooe.gv.at> writes:
> Hi ntpd folk,
> This will be a long email, I hope somebody is able to help. In short: My
> dcf77 doesn't work very well and I don't know exactly why.
A few basics:
Whenever DCF-77 receives a bad spike, it needs at least
120 - "time of the spike" to synchronize again. Maybe even one extra
minute to be sure.
The DCF-77 antenna is directional, so you need to have it turned in the
right direction. Unfortnuately it's not easy to find the optimal
For the clock hopping: Use "ntpq -p" to find out whether your DCF-77 has
a significant offset against the other servers. You'll ahve to minimize
I'd suggest to capture long-term statistics of the clock status. With
the parse driver "ntpq -c cl" should display the statistics.
More information about the questions