On Oct 11, 2:43*am, "Szczepan Bialek" wrote:
*"K1TTT" ...
On Oct 10, 3:04 pm, "Szczepan Bialek" wrote:
In a cristal radio is the diode. The electrons flow from the antenna to
ground. Where they come from?

"... for a copper wire of radius 1 mm carrying a steady current of 10
amps, the (electron) drift velocity is only about 0.024 cm/sec". At
100 ns per RF cycle, the above electron moves back and forth about 10
nanometers, i.e. it doesn't "flow" anywhere except at DC.

At RF those electrons never make it from the antenna to ground and
instead essentially vibrate in place. The only thing that flows at the
speed of light is photons/fields/waves. The slow-moving vibrating
electron carriers form a bucket brigade for the fast moving photonic
energy. That fact of physics wasn't fully understood until the field
of quantum physics matured. EM fields and waves turned out to be
particles that are photonic in nature.
--
73, Cecil, w5dxp.com