On 3 jun, 13:23, "Szczepan Bialek" wrote:
*"Cecil Moore" ...
On Jun 2, 11:48 am, K1TTT wrote:

my differential calculus is a bit rusty, but i don't think that
equation satisfies the basic wave equation.
My calculus is probably a lot rustier than yours but it would be very
important for this discussion if Maxwell's equations do not work for
the standing wave equation. That would essentially prove that the
mashed-potatoes theory of transmission line energy is bogus.

Maxwell's equations are for angular waves in the solid body.
The transmission line and ends of it (antenna) are exactly like the Kundt's
tubes. In the wires is the electron gas.
S*

Thanks to all

Hey boys! (Cecil, David, Michael, et al) It is very funny and
entertaining, I enjoy your postingss mostly in "read only" mode
because translate not simple mine ones still being a struggle for
me :-)
.....
Cecil, I never studied standing waves with Maxwell equations (except
in usual examples of cavity resonators cases learning classes), I
studied only classic electric differential solution to the
telegraper's equations.

Hi Keith: We tend to think of energy as a "tangible and real" easely
intuited thing "out there" (as a water or horses) but we must not
forget energy is a really elusive CONCEPT devised to explain changes
in physical systems. Familiarity tend us to fetishize concepts, then
we easily can get caught in troubles type = "Where velocity goes when
the car smash?" :-D :-D. We must be carefully with forces, powers,
velocities, etc. in this sense...
Note how Terman prudenty deals with differential solution of
Telegrapher's equations: "This combinatiosn of voltage and current can
be INTERPRETED as a wave train traveling toward receiver" (1)
(capitalized letters by me).

The very term "standing waves" leads to endless Ham controversies
about concept of "wave" word in our context.(wave as "a disturb that
propagates" and wave as pattern-figure-graphics-representation of
interference pattern of voltage/current measured along the TL). This
"wave pattern" (is it correct to write "wavy" pattern?) do not carry
any energy from one place to another on the TL it is not a "wave" in
the other sense (transport phenomena). What do you think?

(1) Terman F.E. "Radio engineering". McGraw Hill.1947 Ed. page 78

73

Miguel Ghezzi - LU6ETJ