Hi Bob RRR.
In fact all my original GPSDOs in the '90s were FLLs, for radio comms gear, essentially frequency counters with the error driving a PI loop. They were controlling standard XOs. For new engineers, if they want a project to teach them many skills, I recommend a GPSDO project from scratch, there are many excellent disclipines to grasp, oscillators, control systems, measurement.... and many systematic errors to understand... and the project is only done if the spec is met, and of course the spec can go on being as tight as you want. You could spend your whole life on it.
glen On 25/06/2019 1:16 PM, Bob kb8tq wrote:
Hi In a GPSDO, an FLL can be done with no “cycle slips” between readings. In that case, the I term will indeed correct for long term errors. The net result will be effectively the same as a PLL for long term error. That is by no means to say that *all* FLL’s are done this way. Only that it is one possible implementation. Bob
_______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
