Re: NEC-LIST:Ground constants and measurement amplitude

At 10:07 AM -0800 1/4/02, Rudy Severns wrote:
>...At best soil is a complex granular medium, possibly with non-linear
>characteristics. It is possible that measurements at > 1kW levels may give
>different values for ground constants than a small signal (mW) measurement.
>
>I would appreciate it if anyone could shed some light on this hypothesis.

If soil exhibited substantial nonlinearity, then we would observe
harmonics of high-power transmitted signals; but we do not -- at
least I never have, and I've made some pretty wide-dynamic range
observations of 50-kW AM MW broadcast transmissions for which the
antennas were ground-based, and of 1.5-kW amateur-radio transmissions
in the HF range, where the antennas were close to ground.

-Chuck, W1HIS

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