Could be a delivery truck with a GPS jammer on it, that passes your location every morning at the same time.
--- Graham == On Fri, Sep 29, 2017 at 7:18 AM, Bob kb8tq <kb...@n1k.org> wrote: > Hi > > > > On Sep 28, 2017, at 6:59 PM, Mark Sims <hol...@hotmail.com> wrote: > > > > I suspect that it is either temperature related (the funkiness starts > around when the temperature reaches a minimum) or related to the way the > disciplining parameters are hacked to get the extended time constant. > > Like it or not, most of these devices were made back a while ago. > The CPU’s used were not the ones we have today. the code was tested > over the “expected range” of values. Most (but not all) of the control loop > code was done as integer math. With limited RAM, tossing everything into > 64 or 128 bit integers was not an option. In some cases 32 bit int’s were > at > a premium. Multiply this by that, that, and that. Then divide by > something, and > something else. … hmmm…. a few bits just went missing. Could you reorder > and fiddle to fix some of this? Sure, that’s where we get back to the > expected > range stuff. > > Even if it’s not in the “main loop”, GPSDO code is full of checks for this > or that. > Like the main math, they are scaled and tested for the normal range of > parameters. > Not all of them spurt error messages when they get involved. Some just > bump this > or that and move on. > > Lots of possibilities …. > > Bob > > > > > Try setting up for say a 10,000 second time constant and see how things > change. > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.