Actually, most likely, the reason these work, is
because you (and most people) live under the
Biggest Long-Wave Antenna around (Power lines,
telephone cables, TV cables, ect)! And, those
that doubt, tell me the range with a lousy
antenna, that Jim Creek, and Ect. can be copied!
this is around 18 KHz ! Corse, doent hurt
to have a massive antenna, and beaucoup power
! BTW, THAT signal is also used to sync
generators on the Power Grid (wonder what
would happen in a power co got even 1%
out of phase? Answer: Meltdown! Jim NN7K

DTC wrote:
Radium wrote:
So I guess it is possible to have analog AM cell phones operating
between 40 KHz and 285 KHz that are the same small size as today's
cell phones. Right? If it's not possible then why not? If a wrist
watch can do it, then why not a cell phone?

If a wrist watch can to what? Transmit a signal? They don't, they only
receive.