[time-nuts] Trimble Mini-T Timing Glitches

Bob kb8tq kb8tq at n1k.org
Thu Nov 30 15:27:19 EST 2017


GPS extracts time and location by locking on to various codes in the transmissions. 
One of them happens to run at about a 1 KHz clock rate. A slip on that part of the 
process gives you a (modulo) 1 ms clock jump. Certain types of interference may
“help” the receiver make these sorts of mistakes. 


> On Nov 30, 2017, at 2:35 PM, Keith Loiselle <keith.loiselle at gmail.com> wrote:
> Hello everyone,
> I have heard reports of Trimble Mini-T timing glitches with offsets of 1ms
> lasting for about 30 seconds several times during the past week.  Some of
> the dates and times reported are at various locations include:
> 23/11/2017, approx 11:00 UTC
> 29/11/2017, approx 11:00 UTC
> 30/11/2017, approx 12:00 UTC
> We have not observed glitches with any of the equipment we have running,
> but we have not had any Trimble units running during the past week.  Has
> anyone else observed similar glitches recently with Trimble or other GPS
> equipment?
> Thanks,
> Keith
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