Message-ID: <4E36D687.8030004@iup.uni-heidelberg.de>
Date: Mon, 01 Aug 2011 18:38:31 +0200
From: =?UTF-8?B?U3RlZmFuIFNjaMOkZmVy?= <schaefer@iup.uni-heidelberg.de>
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CC: Paul <paul@abelian.netcom.co.uk>
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Subject: Re: VLF: strange transmissions
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Hi Alex, Markus, Lubos, VLF,

Markus, Lubos: But the signals have been ON to the same time (abt 9 UTC)=20
on air than the Alphas, at least it looks like that on the slow=20
scrolling spectrograms!? But maybe you are right. On my RSDN-20_F1 plot=20
there are visible and unusual disturbances. Maybe they keyed the TX for=20
short times. A fast running 11904 Hz spectrogram could tell us more,=20
maybe. I'll forward the mail to Paul Nicholson who probably noticed the=20
transmissions already ;-)

Alex: Well, if the signal appears in Iceland AND in Germany, i think=20
it's not local :-) Signal was strong at OK2BVG and YO/4X1RF...

73, Stefan/DK7FC

Am 01.08.2011 16:28, schrieb Alex Deligiannis:
> On 1/8/2011 1:53 =CE=BC=CE=BC, Stefan Sch=C3=A4fer wrote:
>> VLF,
>>
>> There are strange transmissions near 12.4, 13.3 and 15.6 kHz, narrow=20
>> band, very strong here in Heidelberg=20
>> http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html=20
>> and also in Iceland=20
>> http://simnet.is/halldorgudmunds/TF3HZ_VLFgrabber/index.html, also=20
>> very clear at http://www.ok2bvg.cz/vlfgrabber/ and others.
>>
>> Does anybody know what it is? Looks different to the often seen=20
>> staircases during transmitter tests...
>>
>> Unfortunately many VLF grabbers are paused / OFF these times...
>>
>> 73, Stefan/DK7FC
>>
>>
> Must be local I can't see anything unusual and the noise is low at KM39=
gc
>