Re: Getting a Uputronics GPS Hat to work with Chrony?


 

Some just like a bit more precision -- here is a Raspberry Pi + Adafruit HAT

chronyc sources -v
210 Number of sources = 6

  .-- Source mode  '^' = server, '=' = peer, '#' = local clock.
 / .- Source state '*' = current synced, '+' = combined , '-' = not combined,
| /   '?' = unreachable, 'x' = time may be in error, '~' = time too variable.
||                                                 .- xxxx [ yyyy ] +/- zzzz
||      Reachability register (octal) -.           |  xxxx = adjusted offset,
||      Log2(Polling interval) --.      |          |  yyyy = measured offset,
||                                \     |          |  zzzz = estimated error.
||                                 |    |           \
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#- GPS                           0   3   377    10    +28ms[  +28ms] +/-  111ms
#* PPS                           0   3   377    10   -193ns[  -65ns] +/-  205ns
^- 2001:49f0:d04c:1::2           2   9   377   490  -5846us[-5851us] +/-   41ms
^- 2001:470:e439:1::10           2  10   377   603   +706us[ +699us] +/-   54ms
^- x.ns.gin.ntt.net              2  10   377   605  -5024us[-5032us] +/-   38ms
^- srcf-ntp.stanford.edu         2  10   377   928    -11ms[  -11ms] +/-   56ms


On Mon, Oct 12, 2020 at 11:50 AM David Ranch <rpi4hamradio-groupsio@...> wrote:

Hello John,

From the table included in https://gpsd.gitlab.io/gpsd/gpsd-time-service-howto.html#_1pps_quality_issues , the bottom summary says that accuracy delta would only be say 100mS of a time delta.  I don't see how that could be a problem for 99.9% of most HAM use cases.  Maybe I'm missing something here?

--David
KI6ZHD




On 10/12/2020 09:47 AM, John D Hays - K7VE wrote:
The most accurate time, using Pulse Per Second or PPS, will use a GPS with PPS.  This is not something you achieve with a USB GPS.

The NW Digital Radio DRAWS™ HAT or Adafruit Ultimate GPS HAT are two examples of GPIO attached GPS with PPS.

On Mon, Oct 12, 2020 at 9:40 AM MIKE RICHARDS <mike@...> wrote:
Hi Greg,

I've written a tutorial that might help. Lots of people have used it successfully.

Chrony with Uputronics GOPS

Regards,

Mike - G4WNC


--
John D. Hays
Kingston, WA
K7VE

 




--
John D. Hays
Kingston, WA
K7VE

 

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