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Old June 9th 10, 12:49 PM posted to rec.radio.amateur.antenna
Keith Dysart[_2_] Keith Dysart[_2_] is offline
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First recorded activity by RadioBanter: May 2007
Posts: 492
Default Question about "Another look at reflections" article.

On Jun 9, 7:44*am, Keith Dysart wrote:
On Jun 8, 11:27*pm, lu6etj wrote:





On 8 jun, 22:33, Keith Dysart wrote:


On Jun 8, 8:54*am, Cecil Moore wrote:


On Jun 8, 6:04*am, Keith Dysart wrote:


It is too bad, because the time domain is quite enlightening.


Nothing wrong with a time domain analysis but analyzing problems whose
basic premises violate the laws of physics is a waste of my time and
yours.


I assume that you do not consider that the problems you propose to be
ones "whose basic premises violate the laws of physics".


Consider then, the problem you propose inhttp://www.w5dxp.com/nointfr..htm.
A time domain analysis (http://sites.google.com/site/keithdysart/
radio6),
demonstrates that the analysis presented inhttp://www.w5dxp.com/nointfr.htm
results in the wrong answers.


Perhaps you could locate a flaw in the time domain analysis. Finding a
flaw
would pretty much settle the matter.


...Keith


Hi Cecil. Yes, good comment, definitions of terms specifying their
meanings in each context avoid innecessary disagreements. I think that
it is an essential predialogal "must".


Keith: I just saw your web page =http://sites.google.com/site/keithdysart/radio3
where you seems disagree (please correct me if I am wrong) with our
ideas about superposition principle. I search examples in the Net -for
not paid the price of my hard and slow translations ;)- What do you
think about them?


http://www.physics.ucla.edu/demoweb/...osition/waveSu...


http://www.phy.ntnu.edu.tw/ntnujava/...php?topic=18.0


Superposition works just fine for voltage and current, but is mostly
invalid for power. Attempting to apply superposition to power will
lead to inaccurate results.

From any circuit analysis, superposition is used to find the voltages
and the currents, and then the resulting total voltages and currents
are
used to compute powers. Doing it in the other order does not work.

I am curious as to what I wrote on the web page that suggested
disagreement with the superposition principle.

...Keith


I should have mentioned that the two references you provide are
superposing amplitude (i.e. voltage or current) and not power.