On May 24, 3:06*pm, lu6etj wrote:
For example this part = "by inserting a pad having 15 to 20 dB
I give the following example: If we load a generator directly with a
resistance of 10 ohms, without any transmission line, there are not
traveling waves interfering, therefore there are not stationary waves,

Yes, standing waves are hard to visualize, but there is indeed same-
cycle interference involving forward waves and reflected waves. There
is a certain delay from the source signal to the load and back that
can be calculated if one chooses. The wave reflection model is closer
to Maxwell's equations than is the lumped-circuit model where EM waves
propagate instantaneously. Maybe the concepts presented in the
following paper would help. There is no transmission line for a Tesla
coil but reflection effects still exist. The lumped circuit model, to
which you allude, incorrectly assumes that signals can travel at
faster than the speed of light, an obvious impossibility.

http://www.ttr.com/corum/index.htm

Incidentally, this is the reason that W8JI measured a 3 ns delay
through a foot-long 75m loading coil. There were same-cycle
reflections existing in a near-infinite SWR situation. In such a
configuration, the phase of the current doesn't change at all yet W8JI
assumed the measured phase change was proportional to the delay
through the coil. Nothing could be farther from the technical truth.
--
73, Cecil, w5dxp.com