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Old April 15th 07, 05:06 PM posted to rec.radio.amateur.antenna
Cecil Moore[_2_] Cecil Moore[_2_] is offline
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First recorded activity by RadioBanter: Mar 2007
Posts: 3,521
Default Constructive interference in radiowave propagation

Gene Fuller wrote:
I pointed out a few days ago that the FSU Java applet you lean on so
heavily these days is a simple tutorial device designed by a grad
student and a programmer. As shown, it is physically impossible, since
there is no mechanism in place to cause the waves to suddenly jump
together and interfere.


Good Grief, Gene! You are arguing that because you cannot
view them in the present that they never existed in the
past. Such is nonsense.The left hand side is a historical
plot of the points of the waves before they interfere.
Of course, those points only exist back in history and
no longer exist in the present because everything in the
present is happening at a point. Do you also deny the
existence of the historical yearly temperature plot points
because they don't still exist today? Please get real.
Here's a temperature chart to which you can apply your
"impossible" logic concepts.

http://en.wikipedia.org/wiki/Global_warming

Paraphrasing your idea: "As shown, it is physically
impossible, since there is no mechanism in place to
cause more than one temperature to exist at the
present time."

That java example is an example of implementing the
S-Parameter equation b1 = s11(a1) + s12(a2) which
is CERTAINLY NOT IMPOSSIBLE. By adjusting the magnitudes
and phase angles of a1 and a2, any degree of interference
can be obtained. One wave is s11(a1) and the other wave
is s12(a2). Of course, the interference happens at a point
(or plane) so fast that it is impossible to view in real
time. But by using deductive reasoning and the known
laws of physics, we are able to come up with valid java
scripts like the above. Your confusion is in assuming
all those points have to exist simultaneously in the
present, a really, really ridiculous notion.

They do not and cannot exist simultaneously in the present
just as temperatures on a temperature plot of past years
do not and cannot exist in the present anymore. Those points
on the java script existed back in time and are plotted in
a similar manner to plotting temperatures that no longer
exist in the present.
--
73, Cecil http://www.w5dxp.com