[600MRG] VLF / ELF Antenna Impedance

[Frank Lotito]

Ralph - Please point me to the part that answers my two questions - I can't find it - Frank  K3DZ / WH2XHA
________________________________________
From: 600MRG <600mrg-bounces at w7ekb.com> on behalf of Ralph Wallio, W0RPK <W0RPK at netins.net>
Sent: Thursday, June 22, 2017 1:27 PM
To: 600mrg at w7ekb.com
Subject: Re: [600MRG] VLF / ELF Antenna Impedance

See http://www.w4dex.com/vlf/8971Hz/index.htm for information about
Dex's successful 8.9kHz ELF experiment.  --- Ralph Wallio, W0RPK

On 6/22/2017 12:46 PM, Frank Lotito wrote:
> There have been some recent interesting postings on different message boards regarding experimentation around 8 KHz.  One of the authors suggested to the effect that he plans to measure the (contemplated) antenna system's feed point impedance with an R-X bridge.  Eventually he plans to dump a few hundred watts into the antenna via a yet to be constructed matching circuit.  I assume he will use the R-X bridge measurements to assist in designing a transmitter to antenna matching circuit.  Excellent food for thought !!!!
>
> A question - At ELF, VLF, or for that matter, any frequency where the immediate ground conditions are replied upon to be an integral part of the antenna system, how valuable is a
> "flea power" R-X bridge measurement of impedance when 10's or 100's of watts of RF power will be used?  In other words, is the antenna's impedance a constant that is "not" amplitude dependent?
>
> For the "ideal dipole" in free space, definitely the antenna input impedance is amplitude independent.  I can also appreciate for antennas where the ground conditions play an integral part of the antenna system, weather / soil moisture content will indeed effect the antenna's driven impedance.
>
> 73 Frank K3DZ / WH2XHA
>
>
>
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