[ntp:questions] Problems with Sure OEM pps gps

William Unruh unruh at invalid.ca
Sun Nov 19 18:07:11 UTC 2017


On 2017-11-19, David Taylor <david-taylor at blueyonder.co.uk.invalid> wrote:
> On 19/11/2017 06:29, William Unruh wrote:
> []> t but it is annoying to keep seeing 8 or more postings
>> only to have all of them killed. It is bizzare, and wonder if there is some
>> way of getting google to kill that account.
>> 
>>>
>>> Can you check other devices in the same location?  I've seen something
>>> similar happen when a GPS jamming device was (I guess) parked nearby.
>>> You might also check that the serial feed is still OK.
>> 
>> I have no other devices in the area. All I use is the PPS on that gps
>> receiver, not the nmea. But yes, I do believe it is OK. It is hard to see what
>> could happen in an empty office at 4PM.
>> 
>> I will see if I can find another gps receiver.
>
> I have just two e-mail addresses set to filter and delete.
>
> I was thinking of a mobile phone as the "test" GPS receiver.  If you 
> have an Android phone it will be able to see the individual signal 
> strengths.
>

If it cannot see the sattelites, then I would not expect the pps to suddenly
pick up a 20usec scatter in the pulse timing. The average seems to track the
the time reasonably well (as indicated by the tracking of two external ntp
sources-- I am not getting a drift away from their time of the system).

Unfortunately, the other Ssure GPS board I have is a different one, based on
the Skylark chipset, and the PPS does not seem to be working on it (the pps
light does not blink at all) Perhaps it is not switched on, but the Skylark
GPS manual does not indicate any way of switching on the PPS, or of sending
any NMEA signal to the device-- just proprietary ones which only change the
baud rate or do various temperatures of reboot.




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