Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w38A3PTT016421 for ; Sun, 8 Apr 2018 12:03:28 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1f574n-0004RF-Aa for rs_out_1@blacksheep.org; Sun, 08 Apr 2018 10:57:33 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1f574l-0004R6-4C for rsgb_lf_group@blacksheep.org; Sun, 08 Apr 2018 10:57:31 +0100 Received: from gmy2-mh806.smtproutes.com ([94.186.192.135]) by relay1.thorcom.net with esmtp (Exim 4.89) (envelope-from ) id 1f574i-00033M-0l for rsgb_lf_group@blacksheep.org; Sun, 08 Apr 2018 10:57:29 +0100 X-Katharion-ID: 1523181431.97383.gmy2-mh806 Received: from servigilant.vigilant.es ([87.216.178.132]) by gmy2-mh806.smtproutes.com [(94.186.192.135)] with ESMTP via TCP (TLSv1/TLS_DHE_RSA_WITH_AES_256_CBC_SHA); 08 Apr 2018 09:57:11 +0000 Received: from servigilant.vigilant.local ([fe80::c40d:8140:d722:5448]) by servigilant.vigilant.local ([fe80::c40d:8140:d722:5448%13]) with mapi id 14.03.0123.003; Sun, 8 Apr 2018 10:57:10 +0100 From: =?iso-8859-1?Q?VIGILANT_Luis_Fern=E1ndez?= To: "rsgb_lf_group@blacksheep.org" Thread-Topic: VLF: EbNaut message attempt DL > VK7 Thread-Index: AQHTzMfXlwkFpb/ad0K6jr3liePeTaP1U+CAgABPVICAAP+2TA== Date: Sun, 8 Apr 2018 09:57:09 +0000 Message-ID: <6DB8451D7F3D3947A5918808A59621EA9052@servigilant.vigilant.local> References: <5AC8D995.2000309@posteo.de>,<162a195deeb-1796-6200@webjasstg-vab12.srv.aolmail.net> In-Reply-To: <162a195deeb-1796-6200@webjasstg-vab12.srv.aolmail.net> Accept-Language: es-ES, en-US Content-Language: es-ES X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [144.178.132.235] MIME-Version: 1.0 X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Congratulations for the milestone achievement, Stefan and Edgar !! :-) I'm afraid we are getting used to this goals and consequently, loosing scope of what it really means May be one can get a hint of it just if trying to follow Stefan's path. At the moment just trying to Rx and decode EbNaut here [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 396a95bbad9af60b2ee566edcd35b39e Subject: Re: VLF: EbNaut message attempt DL > VK7 Content-Type: multipart/alternative; boundary="_000_6DB8451D7F3D3947A5918808A59621EA9052servigilantvigilant_" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=HTML_MESSAGE, TO_ADDRESS_EQ_REAL autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false --_000_6DB8451D7F3D3947A5918808A59621EA9052servigilantvigilant_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Congratulations for the milestone achievement, Stefan and Edgar !! :-) I'm afraid we are getting used to this goals and consequently, loosing scop= e of what it really means May be one can get a hint of it just if trying to follow Stefan's path. At = the moment just trying to Rx and decode EbNaut here I have decoded the message from my direct reception and found a unique deco= de list rank 1448 reference phase 0,0,0,0 carrier S/N 10.36 dB in 108.5 uHz But when trying to decode from Edgard's file y find the file start is from = previous day (april 6th) file start time 2018-04-06 15:37:52.210 That means the time offset is 315735.970 seconds and probably bypases the d= uration of the file When running the decode just a lot of decodes at rank 0 :( What I'm doing wrong ?? 73 de Luis EA5DOM ________________________________ De: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org]= en nombre de Markus Vester [markusvester@aol.com] Enviado: s=E1bado, 7 de abril de 2018 21:29 Para: rsgb_lf_group@blacksheep.org Asunto: Re: VLF: EbNaut message attempt DL > VK7 WOW! Just reproduced Stefan's one-character message from Edgar's file. That= 's truly stunning! 73, Markus -----Urspr=FCngliche Mitteilung----- Von: DK7FC An: rsgb_lf_group Verschickt: Sa, 7. Apr 2018 16:51 Betreff: Re: VLF: EbNaut message attempt DL > VK7 Edgar, VLF, Thanks for providing the txt files again. It is amazing! The first day for the 1 char message stack was noisy. Last n= ight, the second day, the noise was 4 dB lower here. The first day produced= a carrier S/N of 3.78 dB, last night produced 7.16 dB. The stack of these = 2 days produces 8.09 dB! In the spectrum peak produced by Paul we can see a slight unsymmetry, the l= eft neighbour bin is stronger than the right neighbour bin. This comes from= the negative phase change that we can also see at NWC (19.8 kHz) from here= . The more or less constant phase change during the transmission is equal t= o a negative frequency offset, shifting some energy in the left neighbour b= in, which becomes already visible in 111 uHz. Thus i played a bit with a fr= equency offset in the EbNaut decoder and found an ideal SNR of 8.30 dB (i = don't tell the offset here for those who like to find it selfe). Applying a= frequency offset is valid because there are public reasons to assume a fre= quency offset can help to improve the SNR I started a decode attempt and got a decode of the correct message already = at phase 0/0/0/0. There were further decodes of the right message but no fa= lse decode was shown. Best Eb/N0 is 2.7 dB, best rank is 2058. When running the decoder without the frequency offset i'm getting even bett= er results, so forget what i said above :-) There are 3 decodes all showing= the correct message at convincing rank and Eb/N0. Unbelivable, we made it after 2 days, and one of them was very noisy! This = is all a bit fast to belive i seems. There must have been a reason why SAQ = is at 17.2 kHz. Time to learn the decoding process now. Let me attach the small wav file fo= r everyone here in the list. There are several EbNaut newcomers who like tu= torials to reproduce a decode :-) It is the first amateur radio message on VLF over such a 16805 km distance!= And a new distance record for EbNaut message decoding. Tonite: f =3D 17470.1000 Hz Start time: 07.APR.2018 19:20:00 UTC (daily) Symbol period: 12 s Characters: 2 CRC bits: 16 Coding 16K21A Duration: 02:33:36 [hh:mm] Antenna current: 1000 mA 73, Stefan Am 05.04.2018 11:15, schrieb DK7FC: Hi VLF, Later we have to report about a spectacular success on the path from DK7FC = to Edgar J.T.. My daily carrier transmissions on 17470.1 Hz are now completed. A new experiment will start today: A 1 character EbNaut message: f =3D 17470.1000 Hz Start time: 05.APR.2018 19:20:00 UTC (daily) Symbol period: 15 s Characters: 1 CRC bits: 16 Coding 16K21A Duration: 02:48 [hh:mm] Antenna current: 1000 mA 73, Stefan --_000_6DB8451D7F3D3947A5918808A59621EA9052servigilantvigilant_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Congratulations for the milestone achievement, Stefan and Edgar !! :-)=

I'm afraid we are getting used to this goals and consequently, loosing= scope of what it really means
May be one can get a hint of it just if trying to follow Stefan's path= . At the moment just
trying to Rx and decode EbNaut here

I have decoded the message from my direct reception and found a unique= decode
list rank 1448
reference phase 0,0,0,0
carrier S/N 10.36 dB in 108.5 uHz

But when trying to decode from Edgard's file y find the file start is = from previous day (april 6th)
file start time 2018-04-06 15:37:52.210

That means the time offset is 315735.970 seconds and probably byp= ases the duration of the file
When running the decode just a lot of decodes at rank 0 :(

What I'm doing wrong ??

73 de Luis
EA5DOM

De: owner-rsgb_lf_group@blacksheep.org [o= wner-rsgb_lf_group@blacksheep.org] en nombre de Markus Vester [markusvester= @aol.com]
Enviado: s=E1bado, 7 de abril de 2018 21:29
Para: rsgb_lf_group@blacksheep.org
Asunto: Re: VLF: EbNaut message attempt DL > VK7

WOW! Just reproduced Stefan's one-character message from Edgar's file.= That's truly stunning!

73, Markus 


-----Urspr=FCngliche Mitteilung-----
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Sa, 7. Apr 2018 16:51
Betreff: Re: VLF: EbNaut message attempt DL > VK7

Edgar, VLF,

Thanks for providing the txt files again.
It is amazing! The first day for the 1 char message stack was noisy. Last n= ight, the second day, the noise was 4 dB lower here. The first day produced= a carrier S/N of 3.78 dB, last night produced 7.16 dB. The stack of these = 2 days produces 8.09 dB!

In the spectrum peak produced by Paul we can see a slight unsymmetry, the l= eft neighbour bin is stronger than the right neighbour bin. This comes from= the negative phase change that we can also see at NWC (19.8 kHz) from here= . The more or less constant phase change during the transmission is equal to a negative frequency offset, sh= ifting some energy in the left neighbour bin, which becomes already visible= in 111 uHz. Thus i played a bit with a frequency offset in the EbNaut deco= der and found an ideal SNR of  8.30 dB (i don't tell the offset here for those who like to find it selfe). App= lying a frequency offset is valid because there are public reasons to assum= e a frequency offset can help to improve the SNR

I started a decode attempt and got a decode of the correct message already = at phase 0/0/0/0. There were further decodes of the right message but no fa= lse decode was shown. Best Eb/N0 is 2.7 dB, best rank is 2058.
When running the decoder without the frequency offset i'm getting even bett= er results, so forget what i said above :-) There are 3 decodes all showing= the correct message at convincing rank and Eb/N0.

Unbelivable, we made it after 2 days, and one of them was very noisy! This = is all a bit fast to belive i seems. There must have been a reason why SAQ = is at 17.2 kHz.

Time to learn the decoding process now. Let me attach the small wav file fo= r everyone here in the list. There are several EbNaut newcomers who like tu= torials to reproduce a decode :-)
It is the first amateur radio message on VLF over such a 16805 km distance!= And a new distance record for EbNaut message decoding.

Tonite:

f =3D 17470.1000 Hz
Start time: 07.APR.2018  19:20:00 UTC (daily)
Symbol period: 12 s
Characters: 2
CRC bits: 16
Coding 16K21A
Duration: 02:33:36 [hh:mm]
Antenna current: 1000 mA

73, Stefan

 

Am 05.04.2018 11:15, schrieb DK7FC:
Hi VLF,

Later we have to report about a spectacular success on the path from DK7FC = to Edgar J.T..
My daily carrier transmissions on 17470.1 Hz are now completed.

A new experiment will start today: A 1 character EbNaut message:

f =3D 17470.1000 Hz
Start time: 05.APR.2018  19:20:00 UTC (daily)
Symbol period: 15 s
Characters: 1
CRC bits: 16
Coding 16K21A
Duration: 02:48 [hh:mm]
Antenna current: 1000 mA

73, Stefan
--_000_6DB8451D7F3D3947A5918808A59621EA9052servigilantvigilant_--