[Milsurplus] Command Sets selectivity video ?

[Hubert Miller]

A while back, like 3 years, I watched some YouTube video on selectivity experiments with Command Sets receivers,
which compared Q multiplier, crystal filter, and so on. I cannot seem to find it now. Anyone give me a pointer on
who the author was, or a better term to search on, or any good clue?
tnx
Hue
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