Posted by
Ian Kemp on
URL: https://www.es-forum.com/Re-shielding-tp1540370p1540384.html
The theory of interference patterns is that one could get down to a complete
zero signal at the "antinode" and double the original signal at a "node".
However a meter may not be able to measure a location that accurately. And
I am only guessing that it is a true interference pattern; local variations
can be caused by other effects e.g. reflection, partial blockage, trees
etc., as others correctly said previously.
Ian
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From:
[hidden email] [mailto:
[hidden email]] On Behalf Of jean
Sent: 19 January 2006 19:52
To:
[hidden email]
Subject: [eSens] Re: shielding
--- In
[hidden email], "Ian Kemp" <ianandsue.kemp@u...> wrote:
> Incidentally, when two beams overlap, the "nodes" referred to by
Charles and Shivani can be an "interference pattern", with alternating high
and
low intensities a short distance apart, caused by transverse waves at
different points in their cycle either reinforcing each other or cancelling
each other out.
>
> Ian
Yes, depending of the exact distance, and different signal from each
mast, ... sinusoidal variation, ... Although I'm not sure that in
the average if I keep the meter at the same point a while, 20 uW of
difference is a lot. I get something like 15uW in one points and 35
uW 30cm apart. Anybody has the exact math theory ? I don't have
anything between the window and the mast it's too high for the trees.
jean.
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