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#30
August 6th 17, 02:00 PM
posted to uk.radio.amateur,uk.rec.models.engineering,rec.radio.amateur.homebrew
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A mechanical phase locked loop!
On 06/08/2017 13:52, Gareth's Downstairs Computer wrote:
On 06/08/2017 12:24, Chris wrote: On 08/06/17 10:38, Jeff wrote: You are making pointless distinctions. A phase locked loop is not defined by its mechanics but by the nature of its control. The Shortt clock maintains the relative *phase* of the two clocks by brief adjustments to the frequency via a spring. This is controlled by measuring the relative *phase* of the two clocks. Wrong! It does NOT measure the relative phase, it makes NO measurement of the phase difference. All it does is detect if there is a phase lag of any degree. It could be a fraction of a degree or 180 degrees, the same correction is then applied regardless. It's that simple. You are just making things more complicated by talking about the details of how the adjustment works and the time function of the frequency. NO PLL can keep the two clocks perfectly in sync. Calling it open loop is just absurd. The loop is closed because it *measures* the phase of the clocks and adjusts the phase according to the measurement. It may be binary, but the adjustment is controlled by the measurement. Wrong again it is open loop, there is no measurement, just the same adjustment regardless of the phase difference. Jeff Might be easier to define a set entitled "Locked Oscillators, of which the phase locked loop, injection locked and hit and miss synchronised are all members. Are there other candidates ?... From pre-war, the Goyder Lock? Which raises an interesting point; before the 3-tier coffer-filling fiasco was the spawn of the RSCB, the candidature for the RAE tended to know all about the history of amateur radio before getting their licence, but now they seem to know sweet FA even after getting their licences, such as the difference between sideband and sidetone. House! |
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