[time-nuts] Warped back to 1993

Bob Camp lists at rtty.us
Wed Aug 14 06:25:18 EDT 2013


Hi

Commercial system:

1) GPS is giving wrong time, NTP is still running (as a slave)
2) GPS is broke
3) Manufacturer says they won't fix / patch the obsolete GPS
4) Buy new GPS on company credit card

Whole process likely takes less than an hour.

Bob

On Aug 14, 2013, at 3:58 AM, mc235960 <mc235960 at gmail.com> wrote:

> 
> Le 14 août 2013 à 09:44, David Malone a écrit :
> 
>> On Sun, Aug 11, 2013 at 03:12:00PM +0200, Magnus Danielson wrote:
>>> I'm sure that the NTP drivers can be hacked to make necessary
>>> adjustments without too much code.
>> 
>> I seem to have been caught by the same time warp (or a similar one)
>> on a GPS unit that I've been using with our NTP server since 1999.
>> I doubt I will be able to update the firmware, so I've made the
>> change shown below to the NTP NMEA refclock. It assumes that your
>> GPS unit might be slow by a multiple of 1024 weeks, and trys to get
>> the timestamp within 512 weeks of the current system time before
>> feeding it to NTP.
> 
>    Considering the small number of time nuts  this issue is taking on leap second dimensions. I wonder how many commercial systems have had down time due to this? 
>    I'll have to dig out and test all my sleeping receivers to see which have turned into boat anchors.
> 
> 
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