> thanks for the answer. I'm still trying to figure out more about
> this question. Interferences, signal recombination, ugh. It's messy
> physics. It might be interference between two masts, cause I'm
> really facing the masts without anything in between. And there are
> big variations just moving the meter 30 cm, and pointing in the same
> direction.
>
> jean.
>
> --- In [hidden email], "Ian Kemp" <ianandsue.kemp@u...> wrote:
>>
>> 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.
>>
>>
>>
>>
>>
>>
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>