Re: VLF: First VLF detection DL > EA

[Markus Vester <markusvester@aol.com>]

A strong signal here in Nuernberg, showing an easily visible noise band on my grabber. But strangely no "E" decode came out. There might have been a propagation dip with a phase inversion around 13:20 UT.

Best regards,
Markus (DF6NM)


-----Ursprüngliche Mitteilung-----
Von: Riccardo Zoli <riccardozoli80@gmail.com>
An: LF Group <rsgb_lf_group@blacksheep.org>; DK7FC <selberdenken@posteo.de>
Verschickt: Di, 5. Dez 2017 20:23
Betreff: Re: VLF: First VLF detection DL > EA

Hi Stefan, Luis, Paul, VLF

this is my decode (the first in VLF).
Very strong here, despite noisy reception.
Stefan, please could you try to send a faster message after sunset,
when SNR of your carrier is much better?
I made some tests whith EbNaut decoder: " ****** " message appear on
your carrier with 2 or 3 sec./sym (with a few +dBs of Eb/N0).

All the best

73 de Riccardo IW4DXW



2017-12-04 21:49 GMT+00:00 DK7FC <selberdenken@posteo.de>:
> Hi VLF,
>
> Tomorrow i'm going to gtry to pass a first EbNaut message over to EA5DOM.
> Here are the details:
>
> f = 17470.1000 Hz
> Start time: 05.Dec.2017 07:00:00 UTC
> Symbol period: 120 s
> Characters: 1
> CRC bits: 6
> Coding 8K19A
> Duration: 08:00 [hh:mm]
> Antenna current: 1 A
>
> 73, Stefan
>
>
>
> Am 02.12.2017 13:31, schrieb VIGILANT Luis Fernández:
>
> Hi VLF
>
> Congratulations Stefan and thank you all for the good information exchanges
> in the reflector
>
> It is all the effort at your side Stefan. I still didn't do the homework to
> decrease the local QRM, which is
> quite high as you can see in the 25KHz spectrogram. There is a very nasty
> noise which appeared just
> this last couple of days and affects exactly 17470Hz. It is random and runs
> for a couple hours. Can be seen
> as vertical noise lines in the lower spectrograms and is very noticeable in
> the 47uH spectrogram
>
> It is my first detection of Ham activity under LF so far. And there is a lot
> to improve to get same results
> at 8270Hz. A new Rx setup in a different (hopefully cleaner) QTH is in the
> "To Do" list ;-)
>
> 73 de Luis
> EA5DOM
>
> ________________________________
> De: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org]
> en nombre de Daniele Caccia [daniele.caccia74@gmail.com]
> Enviado: sábado, 2 de diciembre de 2017 12:07
> Para: rsgb_lf_group@blacksheep.org
> Asunto: Re: VLF: First VLF detection DL > EA
>
> Dear VLF er
>
> Congratulations to all for the results obtained so far!
>
> Best regards from Daniele SWL I55387FI -ITALY-
>
>
>
>
>
>
> 2017-12-02 10:30 GMT+01:00 Alberto Martinez <ea4ghb@gmail.com>:
>>
>> Congratulation Stefan and Luis!
>>
>> It´s weak but seeable. very good work.
>>
>> 73.
>> Alberto-EA4GHB
>>
>> 2017-12-02 9:57 GMT+01:00 DK7FC <selberdenken@posteo.de>:
>>>
>>> Hello VLF friends,
>>>
>>> This morning i looked on the EA5DOM VLF grabber and saw much better
>>> traces of the carrier on 17.4701 kHz.
>>> https://ea5dom.ure.es/grabber/index.html
>>>
>>> I find this is a valid one-way contact or carrier detection and i think
>>> it is the first time that this was done by amateurs between DL and EA.
>>> A distance of 1393 km, http://k7fry.com/grid/?qth=IM98XN&from=jn49ik00wd
>>>
>>> It looks like there is some QSB on that path, higher than observed a
>>> similar distance at 8270 Hz.
>>> We can now think about improvements and about a first message attempt...
>>>
>>> 73, Stefan
>>>
>>
>

17k47_21uHz_12051505_sym.png
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17k47_21uHz_12051505-log.txt
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