Re: VLF: First VLF detection DL > EA

[Jacek Lipkowski <sq5bpf@lipkowski.org>]

decoded the 20171205 transmissions on 17470.1Hz, but without the 
noiseblanker. the decoded messages were already published, so i'm 
including them here too.
7:00 UTC transmission

prep [  0    0    0    0    0]
found rank 0 ber 2.8333e-01 Eb/N0 8.4 M -2.589702606e+00 [E] ps [  0    0    0  
  0    0]
carrier phase: -6.0 deg
carrier Eb/N0: 10.3 dB
carrier Es/N0: -5.94 dB
carrier S/N: 17.86 dB in 34.7 uHz, -26.73 dB in 1Hz, -60.71 dB in 2.5kHz
elapsed 28


21:40 UTC transmission

found rank 0 ber 3.6042e-01 Eb/N0 4.3 M -3.565651894e+00 [CIAO] ps [ 35  -90  
-90  -60  -60]
carrier phase: -8.8 deg
carrier Eb/N0: 3.4 dB
carrier Es/N0: -12.88 dB
carrier S/N: 16.94 dB in 34.7 uHz, -27.65 dB in 1Hz, -61.63 dB in 2.5kHz
elapsed 397

i will try it with additional notching and a noiseblanker and it that 
makes a big difference i will add it to my 17470.1Hz grabber on the 
klubnl.pl page as well

VY 73

Jacek / SQ5BPF


On Mon, 4 Dec 2017, DK7FC wrote:

> Date: Mon, 04 Dec 2017 22:49:56 +0100
> From: DK7FC <selberdenken@posteo.de>
> Reply-To: rsgb_lf_group@blacksheep.org
> To: rsgb_lf_group@blacksheep.org
> Subject: Re: VLF: First VLF detection DL > EA
>
> 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