Posted by Jean-2 on
URL: https://www.es-forum.com/Re-shielding-tp1540370p1540373.html

--- In [hidden email], "Ian Kemp" <ianandsue.kemp@u...> wrote:
>
> How significant are TV antennae at picking up e-m radiation at non-
TV
> frequencies? We tried taking our TV aerial down but didn't notice
any real
> difference.
>
>  
>
> 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


It just give me the idea of another thing to measure. Now in my case
the phone tri mast, my window is parallel to one side of the triangle
(I assume, although not sure). That means I would get two lobes more
or less equally, although once again not sure.

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.