> 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
>
>
>
> _____
>
> 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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