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 <[email protected]>
Reply-To: [email protected]
To: [email protected]
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: [email protected] [[email protected]] en
nombre de Daniele Caccia
[[email protected]]
Enviado: sábado, 2 de diciembre de 2017 12:07
Para: [email protected]
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 <[email protected]>:
Congratulation Stefan and Luis!
It´s weak but seeable. very good work.
73.
Alberto-EA4GHB
2017-12-02 9:57 GMT+01:00 DK7FC <[email protected]>:
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
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