>The usage of a directed energy weapon consists of many different radio frequencies which are modulated or pulsed then amplified and pushed through an antenna. There is no “holy grail frequency” as different frequencies and waveforms effects the body differently.
I think you may not understand the notion of pulsed frequencies; this does not have to do with variating the frequency in question.
ELF is a separate matter and outside the scope of the research which is about pain-inducing DEW.
And BTW there is no “reverse engineering” of DEW :) It’s called measurement.