On Saturday 30 June 2012 19:12, Stefan Schäfer wrote:
> MF,
>
> About the 630m band dipoles i remember a story:
>
> In late 2008 i started with the 100m kite experiments and used
> J-antennas for 160m. That worked excellent. Matching was done with a 28m
> long RG58 cable. The losses couldn't have been to high since i run 600W
> RF and nothing became significantly warm.
> One evening i was in QSO with a German station while it started to rain.
> If the kite becomes wet, the wind has to be stronger or at least stable
> to keep it in the sky. So it was a question of time until the kite falls
> down. It was completely dark and i didn't see the kite.
> The QSO partner became weaker and the QRN was down. Later i saw that the
> kite was stretched on the wet ground. The SWR was down but anyway it was
> possible to hear the other station and it was possible to finish the QSO!!!
> That was exactly the location where i did the VLF kite experiments in
> 2010/11. The ground conductivity must be "fair" there.
fair ground conductivity you say!
I have read something about "earth level dipoles" experimentation on the
desert sand and on snow/glass fair ground.
But I don't remember when and where....
73 de Claudio ik2pii
> So, if this is possible with a J antenna on the ground (should behave
> about like a dipole on the ground (?) ), it must work on MF too. Or am i
> wrong? That means, for a MF dipole test i would start to try to lay it
> on the ground. If this works with reasonable efficiency, so that a QSO
> is possible, it would be a simple solution for a quick /p MF antenna
> that can find its place in a back pack!
>
> What do the experts think? :-)
>
> 73, Stefan/DK7FC
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