On Sat, 29 Dec 2018, Markus Vester wrote:

> 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
>
>
> Am 29.12.2018 18:25, schrieb Jacek Lipkowski:
>> Good signal on my grabber:
>>
>> https://klubnl.pl/wpr/en/index.php/klubnl-pl-grabbers/grabber-4-8270hz/
>>
>> What is the antenna orientation?
>>
>> jacek
>>
>> On Sat, 29 Dec 2018, DK7FC wrote:
>>
>>> Date: Sat, 29 Dec 2018 13:43:14 +0100
>>> From: DK7FC <[email protected]>
>>> Reply-To: [email protected]
>>> To: [email protected]
>>> Subject: LF: VLF Carrier on 8270.01 Hz from a ground loop antenna -
>>> The 6th
>>>     station on Paul's spectrogram
>>>
>>> Hi VLF friends,
>>>
>>> Since 11:35 UTC i'm running about 2.5 A antenna current into my 900m
>>> long ground loop antenna. Frequency is 8270.01 Hz. The signal is very
>>> strong on my own grabber in 57.6 km distance but also at DF6NM, DL0AO
>>> and it looks like there is a peak now on Paul's spectrogram building
>>> up slowly.
>>> I intend to run the carrier for 2 hours or so, until the accu is
>>> almost empty :-)
>>> The H bridge PA voltage is 175 V and the power consumption is 450 W.
>>> Today, the DC measuremant result is 66V for 1 A antenna current. It
>>> is cold and wet!
>>> More soon.
>>>
>>> 73 de DK7FC/P in JN39WI
>>>
>>> PS: The QRN is exceptional low!!!!
>>>
>
>