In article . net, "Bill Sohl"
writes:

Radio is but a small part of electrical engineering, and it keeps getting
smaller as other technologies come along. Heck, the hot subject in
communications today is fiber optics - which works by on-off keying!

While it is true that fiber technology today is digitally based, fiber
can actually be used for an analog transmisison function if someone
wanted to.

Of course!

But in fact, the mode used in practically all fiber optic communications is
simple on-off keying of a "carrier".

Very similar, in fact, to landwire telegraph practice, speeded up and
automated, and using photons instead of electrons.

73 de Jim, N2EY

73 de Jim, N2EY