[time-nuts] Warped back to 1993

Bob Camp lists at rtty.us
Sun Aug 11 13:05:16 EDT 2013


Hi

I think that without much risk, you could put in a "gps epoch" setting in the ntp configuration file. More or less make it a "check and correct if needed" sort of thing. No setting in the file would mean disable the check and correct code. 

Bob

On Aug 11, 2013, at 12:58 PM, Martin Burnicki <martin.burnicki at burnicki.net> wrote:

> Bob Camp wrote:
>> Hi
>> 
>> … and since NTP is open source, doing the hack is not dependent on getting a new firmware image for the GPS.
> 
> Hacking ntpd is one possibility, with the risk that a workaround for some broken GPS receiver also affects GPS receivers which are working correctly.
> 
> At least in some of ntpd's refclock drivers you can configure a fixed offset using a "fudge time1 ..." command., e.g. for the parse driver
> 
> fudge 127.127.8.0 time1 7200
> 
> would add a 7200 s offset to the time from the refclock. As far as I know this also works for larger offsets, at least with the parse driver, and this possibly can also be used to fix a constant offset for broken GPS receivers, depending of the refclock driver used.
> 
> Anyway, I think it's worth a try, and it would not require any code change in ntpd or the firmware.
> 
> Martin
> 
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