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[–] Caliope 0 points 1 point (+1|-0) ago 

You can easily build a jammer for 100mHz to 1gHz using an old tv flyback transformer and a wooden disk with carbon nodules (removed from #1 pencils) which are embedded into the wheel. Apply voltage, spin the wheel and broadband jamming occurs due to HV Arc effect. Used for TEMPEST defense in 1950's - 1970's.