"N2EY" wrote in message
...

The ONLY way a "spark" transmitter could send anything called
communications information was by on-off keying.


Not entirely correct. From what I have read, in '200 meters and down', I
believe...it stated that a rudementary form of modulation was attempted by
using a loop inserted in the field of the synchronous spark and a carbon
microphone.

This is all from memory, so if Lenny has the facts and nothing but the facts
I'm sure he will jump in. And Herrrrrrrrrrs Lenny............

Dan/W4NTI