[ntp:questions] using both a PPS source and a HBG (dcf-77-like) timesource?

Hal Murray hal-usenet at ip-64-139-1-69.sjc.megapath.net
Mon Jan 14 18:54:15 UTC 2008


In article <s5SdnZLoifsgOxbanZ2dnUVZ_h_inZ2d at megapath.net>,
 hal-usenet at ip-64-139-1-69.sjc.megapath.net (Hal Murray) writes:
>
>>Currently I'm syncing against NMEA/PPS and seeing quiet a big offset:
>>
>>     remote           refid      st t when poll reach   delay   offset  jitter
>>==============================================================================
>>xGPS_NMEA(0)     .GPS.            0 l    7   16  377    0.000  -185.08   1.001  <---
>> PPS(0)          .PPS.            0 l    -   16    0    0.000    0.000   0.001  <---
>
>Your PPS isn't working.  See the 0 in the reach column?  That's a bit mask
>(octal) of the last 8 tries.
>
>The NMEA driver automatically uses the GPS if it works.  THe 185 ms offset
>is consistent with what I've seen on the GPS 18 LVC when PPS is not working.

Argh.  Typo.  That should be:
  The NMEA driver automatically uses the PPS if it works.

Note that means that you can't "fudge" things correctly.  You would
really want 2 different fudges, one for the NMEA and one for PPS.

-- 
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