[TangerineSDR] PSWS Time Stamping Concept/ SBC clock set idea

[Rob Wiesler]

Bill, I'm sorry for the duplicate response.  Apparently I'm one of the
ones that's been sending mail to the list from a non-subscribed
address.  I'll see if I can't keep my MUA in check from here on out.

On Tue, Oct 22, 2019 at 9:58 PM Rob Wiesler <rpw10 at case.edu> wrote:
> On Mon, Oct 21, 2019 at 3:27 PM Engelke, Bill via TangerineSDR
> <tangerinesdr at lists.tapr.org> wrote:
> > If we put the DE into GPSDO mode (so that it “arms” and then gets the time from the GPSDO PPS pulse), should we have the DE send this highly accurate time to the SBC, and set the SBC’s clock accordingly?  This might reduce confusion that could arise if DE and SBC have slightly different time due to the GPSDO being more accurate.   What do you think?
>
> The extra jitter gained by doing that naively is probably not a good
> thing.  However, so long as we have a GPS on board, we should be
> configuring the SBC as a stratum 1 time server (which is a thing
> people have been doing for a while) using the GPSDO/s PPS output (and
> NMEA time sentences?  I've not done this before, myself).  That should
> be more like what you want.