I have a curious mind, so i did try.
I get the sound from the calculator, but no interference from metallic objects.I tried with both strong and a weak stations, i didnt understood what the guy said about this.
Anyway he is obviously hiding (and using) his thumb for some reason,however i dont think only messing with the volume would be enought to get this sound...
It is possible that by mixing the calculator oscillator circuit with one of the local oscillators inside the radio he is making a BFO detector.In that case working or not would depend of the radio and calculator circuits.
Fred.
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