Date: Sat, 29 Dec 2018 21:44:02 -0330 (NST)
From: jcraig@mun.ca
To: rsgb_lf_group@blacksheep.org
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Message-ID: <Pine.LNX.4.64.1812292130510.6420@plato.ucs.mun.ca>
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 <1274597095.10609542.1546113369131@mail.yahoo.com>
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Subject: Re: LF: VLF Carrier on 8270.01 Hz from a ground loop antenna - The
 6th station on Paul's spectrogram
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Hi Markus, VLF,

Thanks for mentioning the 8270.0027 Hz traces at DL0AO. I've been watching
closely ever since. There appear to be dirunal frequency shifts on
this signal (or perhaps it is my imagination).

There are guard rails here that run in a straight line for about a km=20
that would make fine ground loops for VLF but getting across the pond
might be challenging.

73
Jor VO1NA

  necy=20
shifts

On Sat, 29 Dec 2018, Markus Vester wrote:

> Hi Stefan,
>
> a similar "miracle" occured at DL0AO: The trace from your ground loop app=
eared=C2=A0very strong on the NS-loop, which should have a null towards you=
r transmitter. The peak was - 120 dB on EW and V, and=C2=A0-125 dB on NS, o=
nly 5 dB difference.
>
> I believe our=C2=A0N-S receive loop is seeing only the=C2=A0skywave compo=
nent. Due to the angular orientation of your=C2=A0transmit=C2=A0loop, the e=
lectric field of the upward radiation will be=C2=A0polarized in the NW-SE d=
irection, with the orthogonal magnetic field=C2=A0pointing NE-SW. This pola=
rization will be more or less retained during the reflection (possibly=C2=
=A0rotated a bit by Faraday effect). So=C2=A0the downgoing wave will also c=
ontain=C2=A0a magnetic field component=C2=A0in the E-W direction, which=C2=
=A0is then picked up by=C2=A0the NS-loop.
>
> So yes, earth loops are loops.
>
> Best 73,
> Markus (DF6NM)
>
> -----Urspr=C3=BCngliche Mitteilung-----
> Von: DK7FC <selberdenken@posteo.de>
> An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
> Verschickt: Sa, 29. Dez 2018 19:27
> Betreff: Re: LF: VLF Carrier on 8270.01 Hz from a ground loop antenna - T=
he 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=3DKO02MD&from=3DJN39WI
> 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 <selberdenken@posteo.de>
>>> Reply-To: rsgb_lf_group@blacksheep.org
>>> To: rsgb_lf_group@blacksheep.org
>>> Subject: LF: VLF Carrier on 8270.01 Hz from a ground loop antenna -
>>> The 6th
>>> =C2=A0 =C2=A0 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!!!!
>>>
>
>
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