[ntp:questions] distance to dcf77 transmitter: how to set the fudge?

Folkert van Heusden folkert at vanheusden.com
Wed Jan 26 16:37:03 UTC 2005


Am I right that when I want to tell ntpd that it has to take care of the 
distance to the dcf77 transmitter that I have to do that like this?

# DCF77 receiver
# "Der DCF77 Sender steht in Mainflingen (50 0 Nord, 09 00 Ost), etwa 25 km 
sdstlich von Frankfurt/Main."
# http://www.maporama.com/
# Mainflingen: 50 1' 54" , 9 1' 33" 50.0318 , 9.026
# Gouda/2804 RR: 52 1' 37" , 4 42' 15" 52.0272 , 4.7044
# http://www.fcc.gov/mb/audio/bickel/distance.html
# -> 374.766km
# speed of light: 299 782.458 km/s
# delay: 1.25012652ms
server 127.127.8.0 prefer mode 14
fudge  127.127.8.0 time1 0.00125012652

I ask this question as suddenly the offset for my DCF receiver sky-rockets:

      remote           refid      st t when poll reach   delay   offset 
jitter
==============================================================================
  GENERIC(0)      .DCFa.           0 l   77   64   16    0.000  -246.13  11.484  <---
  keetweej.intran 130.149.17.8     2 u   71   64   66    0.063    0.488  23.017
+auth1.xs4all.nl 193.79.237.14    2 u  139  256   17    8.006  -19.688  0.428
*ntp1.NL.net     .GPS.            1 u  135  256   17   18.812  -17.445  0.527
+ntp3-rz.rrze.un .DCFp.           1 u  135  256   17   26.414  -16.742  0.266
+sombrero.cs.tu- .PPS.            1 u  135  256   17   25.625  -16.648  1.997
  time.windows.co 192.43.244.18    2 u  194  256    7  178.229  -23.918  8.905
  time1.apple.com 17.254.0.49      2 u  130  256   17  165.664  -19.072  0.834
  clock3.redhat.c .CDMA.           1 u  132  256   17  188.132  -16.833  0.369


Folkert van Heusden

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