[Lowfer] WM too bright!

Bill Ashlock [email protected]
Wed, 19 Nov 2003 22:20:44 -0500


JA,

> > I'm confused. Are you sure that the higher readings at various measuring
> > sites in the winter weren't due to improved efficiency of the 
>transmitting
> > antenna (a local effect) and had little to do with the soil conductivity
> > in the far field?
>
>I'd agree with John D. that it's some of both. But the effect is to change
>the attenuation curve. The variations at 10 miles are greater than those at
>2 miles.

That IS rather interesting the more I think about it. When it comes to 
surface wave propagation, the fine details of how it really works, may never 
be fully known.  Now that I have a tool to measure the signal strength of my 
signal on the other side of the mountains to the north, I'm expecting 
(according to a textbook of mine) to find the signal will actually pick up 
some strength and try to get back to the 1/d fall-off rate. This makes 
little sense if the wave, according to some, is eaten up when it passes over 
  the poor soil in the mountains. And this gets back to your BC signal 
measurements. It could be just a local receiving antenna/ground conductivity 
effect that causes the rapid signal fall-off when the soil is poor.

Bill A

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