Chris wrote:
4) why use a PPS as the communications link from GPS to GPSDO?
Generally, because that is the only precision timing output you get from a GPS unit. The models with a 10kHz output were prized by the "simple GPSDO" crowd precisely for the fact that the phase-locked 10kHz signal made the control loop much easier to design (or, made an analog loop *possible* to design).
Can I find a way to move the OXCO into the guts of a GPS receiver.
I don't know. Can you? That is essentially what the Thunderbolt does, and it brings with it the tremendous advantage that it removes the sawtooth error -- which is why some of us think so highly of that design. But now you are really down and dirty, designing your own GPS receiver. Are you competent (and, if so, willing) to do that? (You are very, very far from a "simple" GPSDO if you are considering this.)
Honestly, I never understood why all timing receivers aren't designed that way. It seems to be such a superior way to do things that I'd have thought the other approaches would have died out once everybody knew about it. Even if Trimble has a patent, I can't imagine it would be that expensive to license. But even Trimble doesn't use it on all of their timing receivers.
Anybody know why this scheme hasn't been used more widely? Is there something I'm missing?
Best regards, Charles _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
