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Subject: Re: CEO charged for refusing to get off cellphone during Southwest flight Posted on: Thu, 15 May 2008 13:43:25 -0700

In article ,
"Bob Myers" wrote:

> "Line of sight," as the phrase is commonly used in
> RF propagation discussions, simply means that you
> are talking about a frequency range where ionospheric
> refraction effects ("skip") cannot contribute significantly
> to the range of the signal - i.e., you can get to the horizon,
> but not much beyond it.

I'd agree that "line of sight" can have this "skip" or "over the
horizon" meaning in discussions of RF (or long wavelength) propagation.

However, I believe it's also commonly used --- perhaps more commonly
used --- for situations involving angularly narrow beams, e.g. in
microwave relay links, where you really do have to have a clear "line of
sight" between the two ends.