Re: VLF: First VLF detection DL > EA

[Jacek Lipkowski <sq5bpf@lipkowski.org>]

for comparison the second transmission with notching (using Paul's 
settings) and a noiseblanker (abt 8dB better S/N):
found rank 0 ber 2.4792e-01 Eb/N0 9.9 M -1.090797186e+00 [CIAO] ps [ 28  -30  
-30    0    0]
carrier phase: -0.8 deg
carrier Eb/N0: 11.8 dB
carrier Es/N0: -4.47 dB
carrier S/N: 25.36 dB in 34.7 uHz, -19.24 dB in 1Hz, -53.22 dB in 2.5kHz
elapsed 588

VY 73

Jacek / SQ5BPF

On Wed, 6 Dec 2017, Jacek Lipkowski wrote:

> Date: Wed, 6 Dec 2017 22:38:33 +0100 (CET)
> From: Jacek Lipkowski <sq5bpf@lipkowski.org>
> To: rsgb_lf_group@blacksheep.org
> Subject: Re: VLF: First VLF detection DL > EA
>
> 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