by Harry Dalek » Mon Apr 02, 2018 10:54 pm
I noticed in one 1967 issue of Practical television magazine this Stamp is discussed i did a google to see if i could see it clearer and in colour just out of interest .
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.