Originally Posted By: Mike Kremer
Years ago crystal sets used earphones of about 2000 ohms resistance, but today one can use a pair of Ceramic earphones of at least a million ohms (barium titanate?)
which put out a loud enough sound, that you could attach a horn to.

It has been a long time but I have seen crystal sets that worked with a horn antenna. The volume wasn't exactly room filling, but it was possible to hear them. I don't know how strong a signal you needed to hear it on the horn, but it was there.

Bill Gill


C is not the speed of light in a vacuum.
C is the universal speed limit.