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Date: Sat, 26 Jun 2010 11:09:43 -0500
From: Mike-WE0H <we0h@gmx.com>
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Subject: Re: VLF: Near field boundary (Re DK7FC's DFCW600 8.97kHz transmission)
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I think this is new to many people. Don't feel alone in not 
understanding. I sure am learning a lot by these experiments.

Mike-WE0H




Roger L wrote:
> Dear Markus,
> 
> Maths, EM theory and Maxwell's equations were not my strong points at 
> all, so I'm struggling to understand what you are saying (this is my 
> weakness and not a weakness in your explanation).
> 
> I /think/ you are saying that at the sort of distances being achieved by 
> Stefan (~5.2kms) , the H-field component would be slightly weaker than 
> the E-field, so an E-field probe would result in marginally better 
> reception? At greater distances, the difference would not be significant.
> 
> Markus, if you have time, I have some more questions:
> 
>     * We think Stefan's earth electrode signals are "making the hop"
>       without being aided by buried utilities. Is there any way of
>       confirming this from the field strengths measured using both H and
>       E-field antennas?
>     * Is Stefan likely to get much further using his earth electrode
>       antenna?  i.e, by radiation
>     * Do you know (from theory) how a 300m high Marconi vertical and a
>       300m long earth electrode antenna are likely to compare as
>       antennas /radiating /a far field signal?
> 
> Thank you everyone who has been contributing to the discussion and 
> practical experimentation below 9kHz. It is totally absorbing. I just 
> wish I was more brainy!
> 
> 73s
> Roger G3XBM