On Nov 3, 2022, at 3:46 PM, Jacques_VE2JFE <jacques.f@...> wrote:

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Hi Dan,

You wrote: But a loose mounted crystal wafer rattling about and being OK isn't an intuitive conclusion. Like to learn more about that.

There is several examples of old radios using a “loose resonator crystal”.

The old models of HRO use a plug-in crystal that “rattle” when you shake the holder.

Another fairly well explained case is here:

Go half-way down the page.

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73, Jacques, VE2JFE in Montreal