There are apparently some very simple ways to achieve negative resistance in a home lab. For example http://sparkbangbuzz.com/zinc-40-meter-xmtr/zinc-40-meter-

There are apparently some very simple ways to achieve negative resistance in a home lab. For example http://sparkbangbuzz.com/zinc-40-meter-xmtr/zinc-40-meter-xmtr.htm http://sparkbangbuzz.com/zinc-40-meter-xmtr/zinc-40-meter-xm...