[Lf] Ground loop antennas]

[Andre' Kesteloot]

Talbot Andrew wrote:

> Many years ago, in the early days of 73kHz someone did experiments on
> using ground loops as antennas.  This involved walking out a long piece
> of wire laid on the ground and connected to a spike at the far end, the
> antenna thus consisting of the loop due to the skin depth of the ground
> and return current back to the 'home spike'.   Intuition says that if
> the wire is long enough (say 1km or more), even a spike at the far end
> is superfluous, the in-phase radiation current entering the ground loop
> via the capacitive element in the same way as the recent discussion on
> capacitance hats and lossey earth suggests.  By runing out two wires in
> dipole fashion, the need for any spike is removed.   Since the ground
> rod would, as a rule of thumb, have to go down to at least a skin depth
> to be effective, that is a lot of bashing in !
>
> Presumably this was one of the many areas of experimentation that got
> lost when we moved to the current boringly high band of 137.  This sort
> of antenna will be seriously less effective as frequency rises due to
> the reducing skin depth at high frequencies.
>
> Who was it that used this technique ? I vaguely remember a paper being
> written at the time but can find no reference to it now.   A different
> unrelated project calls.
>
> Andy  G4JNT
>
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