Hi Stefan,

a similar "miracle" occured at DL0AO: The trace from your ground loop appeared very strong on the NS-loop, which should have a null towards your transmitter. The peak was - 120 dB on EW and V, and -125 dB on NS, only 5 dB difference.

I believe our N-S receive loop is seeing only the skywave component. Due to the angular orientation of your transmit loop, the electric field of the upward radiation will be polarized in the NW-SE direction, with the orthogonal magnetic field pointing NE-SW. This polarization will be more or less retained during the reflection (possibly rotated a bit by Faraday effect). So the downgoing wave will also contain a magnetic field component in the E-W direction, which is then picked up by the NS-loop.

So yes, earth loops are loops.

Best 73,
Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: DK7FC <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Sa, 29. Dez 2018 19:27
Betreff: Re: LF: VLF Carrier on 8270.01 Hz from a ground loop antenna - The 6th station on Paul's spectrogram

Hello Jacek,

Oh, indeed, very clear! I did not expect this at all. The loop, if it
behaves as a loop at all (!), points towards Paul. It should have a null
into your direction. Our distance is 976 km !
http://k7fry.com/grid/?qth=KO02MD&from=JN39WI
Why do you see the signal at all? I'm puzzled but it feels good :-)

Tomorrow, maybe i'll do something on 2970.01 Hz!

73, Stefan