I suppose it should be mentioned, for completeness, that strictly speaking the
inverse square law is inapplicable to that range of low band frequencies where
propagation of the signal via ground wave is taking place, as on the 160 meter
band,
de Jim WB5WPA
From: Kenneth Goodwin <krgoodwin@comcast.net>
To: rfi@contesting.com
Sent: Tuesday, June 12, 2018 9:55 PM
Subject: Re: [RFI] Inverse Square Law and RFI
The inverse square law is a geometric result based on the surface area of a
sphere that applies to an RF source radiating equally in all directions that
is in perfect environment, e.g. deep space. In most communication
environments the ratio is closer to the fourth power especially in far field
situations with all the good features of a typical RF environment -
scattering, diffraction, reflection, blockage, etc. Signal attenuation
depends on other factors like frequency not just the distance from the RF
source as stated in the inverse square law. As Jim has indicated in his
previous posting, in the real world it is never that simple. Ken K5RG
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