Dr Bruce Griffiths wrote: > > Peter > > I only intended to indicate that not all GPS timing receivers need > exhibit hanging bridges. > The Trimble Resolution T for example may (or may not) exhibit hanging > bridges. > If anyone has any evidence either way it would be interesting to look at it. > If one also logs the PPS correction then you haven't lost any > information due to the randomisation of the PPS error. > > Surely its better to detect the pseudorange instability in software (if > one has access) rather than attenuating the signal from all SVs. > Another option is to use multiple GPS antennae operating as a phased array. > > Bruce > > I believe the Thunderbolt should not exhibit hanging bridges either, since it's OCXO is used to clock the CPU. I have yet to demonstrate that. It would be helpful to have another GPSDO design to compare it against, and I have not come around to finishing my own home-brew design yet.
The interesting part is that the Thunderbolt is actually a simpler system. Hanging bridges are due to the beat (or lack thereof leading to a constant phase offset) between the OCXO and the CPU clock if I understood well. If these two are one and the same, the problem goes away. Didier _______________________________________________ time-nuts mailing list [EMAIL PROTECTED] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts