Re: [chrony-users] Not getting time from gpsd

[Bill Unruh <unruh@xxxxxxxxxxxxxx>]

Is this supposed to be at a time when your system suddenly looses track of the
time and jumps by hours or days? I see nothing in the gps signal that
indicates anything like that.

If it is supposed to be at the begining of this sample, please give a sample
which spans across, not begins at, one of those weirdnesses.

Note also that probably a copy of the measurements and the refclock logs ove
onw of those times might be more illuminating. Statistics is rather processed
already.






William G. Unruh __| Canadian Institute for|____ Tel: +1(604)822-3273
Physics&Astronomy _|___ Advanced Research _|____ Fax: +1(604)822-5324
UBC, Vancouver,BC _|_ Program in Cosmology |____ unruh@xxxxxxxxxxxxxx
Canada V6T 1Z1 ____|____ and Gravity ______|_ www.theory.physics.ubc.ca/

On Sun, 14 Aug 2016, Chris Greenman wrote:

> Ok  I grabbed a sample of the clock statistics.  
>
>
> On Fri, Aug 12, 2016 at 2:53 PM, Bill Unruh <unruh@xxxxxxxxxxxxxx> wrote:
>       On Fri, 12 Aug 2016, Chris Greenman wrote:
>
>             it's a usb puck.  so no.  Actually I haven't actually looked but
>             typical USB is +5v data+ data- and gnd.  As
>             far as I know the only place the pps signal is available is inside the
>             puck between the GPS module and the usb
>             interface.  
>
>
>       Well, usb serial immitatiors can also immitate the control lines from a serial
>       line. Thus one of the usb packets can be a simlation of the PPS signalalong
>       the appropriate serial line.  But those are likely to have far worse behaviour
>       than the actual lines.
>       It might however be better than the data phrases usually coming along the
>       serial line.
>
>
>
>              like I said I COULD crack it open and run a new cable that included
>             the pps line.
>
>             On Fri, Aug 12, 2016 at 2:24 PM, Bill Unruh <unruh@xxxxxxxxxxxxxx>
>             wrote:
>
>
>                   William G. Unruh __| Canadian Institute for|____ Tel:
>             +1(604)822-3273
>                   Physics&Astronomy _|___ Advanced Research _|____ Fax:
>             +1(604)822-5324
>                   UBC, Vancouver,BC _|_ Program in Cosmology |____
>             unruh@xxxxxxxxxxxxxx
>                   Canada V6T 1Z1 ____|____ and Gravity ______|_
>             www.theory.physics.ubc.ca/
>
>                   On Fri, 12 Aug 2016, Chris Greenman wrote:
>
>                         I CAN hook it up for PPS but it will require cracking open
>             the puck and it's not that
>                         crucial for my use
>                         anyway.  
>
>
>                   Isn't there an output line from the puck which carries the PPS
>             signal?