[ntp:questions] using both a PPS source and a HBG (dcf-77-like) timesource?
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.
These are my opinions, not necessarily my employer's. I hate spam.
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