> Re: [BAWUG] range through brick house with yagi ???
<<The calculation I am using is:
96.6 + 20 log(f) + 20 log(d) dB = PathLoss dB
"f" is frequency in GHz and "d" is path distance in miles.
Of course this is ignoring Median Diffraction loss, Median Tropo
loss, Scatter loss, Atmospheric Absorbtion loss, Meteorological
zone adjustment, etc.>>
Simple free-space path loss models are not easily applicable to an indoor
environment. In particular, one usually observes an effective dependence
more like d^3 (i.e. 30 * log (d)). Concrete floors seem to contribute
around 10 dB of loss; perhaps a brick wall is similar. Note incidentally
that atmospheric absorption losses etc. are negligible at < 20 GHz unless
you are going a very long distance indeed, but scattering off indoor
objects is a large part of what causes the larger effective path loss
coefficient.
--Dan Dobkin
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