Comments have been that the Shortt clock is not a phase locked loop because of the infrequent checking but if you were to cast your mind back to the early days of PLLs in VHF rigs, typically the 145MHz signal was crystal mixed down to a few hundred kHz before being phase checked, and you can't get more infrequent than 1 in 1000, which is really slow compared to the 1 in 30 check rate of the Shortt clock!
Is it, or is it not, phase locking?
Aug 05, 2017
1 Replies
That is because most people seem to be incapable of doing a simple web search.
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"This feedback lo "The slave is kept in synchrony with the master in a phase locked loop."
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