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On 08/03/17 21:31, rickman wrote:
I don't know what you guys are seeing. The two pendulums of the Shortt clock are in lock step. The fact that they are only compared every 30 seconds does not change the nature of the design. The phase comparison signal from a PLL is typically "grainy" in the same way and has to be filtered to become a control signal. The only reason you say they are in "lock step" is because the grain is very fine. The Shortt clock grain is very fine as well typically adjusting only every other 30 second period. I guess the difference is the Shortt clock is adjusting the instantaneous phase and the average frequency while a typical PLL adjusts the instantaneous frequency to try to keep the phase aligned. Both will see variations in phase over time. I would see the Shortt clock as a frequency locked loop, not the same thing as a pll. Different level of instantaneous precision. Semantics, semantics :-)... Chris |
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