Re: Quartz crystal accuracy over time
Surface contouring is used by better crystal manufacturers to improve activity on chosen modes, and to worsen that on other modes but the effect is slight. If you really want a specific mode it is safest to have an LC resonator in the oscillator to force it. So you can choose modes other than the intended one with a bit of care, and that care is a good protection even if you want the intended mode. There is no guarantee that the intended mode is the most active
Crystal oscillators with no other tuned circuits in them are common, save money, but are risky.
David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
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