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LF: RE: 5,2 km distance on 8,97 kHz with an earth antenna

To: "[email protected]" <[email protected]>
Subject: LF: RE: 5,2 km distance on 8,97 kHz with an earth antenna
From: Rik Strobbe <[email protected]>
Date: Fri, 25 Jun 2010 08:58:12 +0200
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Thread-index: AcsUAF98vr1L5xr8TRCjEqkWAdFXQgAMjR70
Thread-topic: 5,2 km distance on 8,97 kHz with an earth antenna
Hello Stefan,
 
thank you for the very interesting report.
 
"This brought me to the idea that if we are discussing ground loop antennas, the impedance of the antenna is not just resistive but it has an inductive component. And, the bigger the loop area, the higher the L and so there should be a phase offset due to that reactive part!? I will try to measure that. Maybe it can give us informations about the depth of the back flowing current…"
Indeed it would. At 9kHz it should be possible to do that using the notebook (headphone output as "signal generator", the 2 stereo inputs to measure voltage and phase at the antenna.
 
73, Rik  ON7YD

Van: [email protected] [[email protected]] namens Stefan Schäfer [[email protected]]
Verzonden: vrijdag 25 juni 2010 2:45
Aan: [email protected]
Onderwerp: VLF: 5,2 km distance on 8,97 kHz with an earth antenna

Dear LF/VLF,

Today i spent more than 8 hours in the forest on a hill 520m ASL, improving and experimenting with my VLF earth antenna. It was a fantastic and very successful day that gave a lot of fun and motivation. BTW, just spending time in this wonderful nature with all its beauty cannot be wasted time even if all the experiments would fail :-)))) That is what i thought many times this day. If you live in a city with much noise (on the band and audible) you may understand what i mean when i say that all you can hear there is the wind and some birds!

Since there are a lot of photos and things to tell i set up a pdf document with my report that is available at http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF_5km_with_an_earth_antenna.pdf , for the VLF enthusiasts (Dreamers!) and those who want to become one! :-)

Best  73, Stefan/DK7FC
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