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 w37JbDho012342 for ; Sat, 7 Apr 2018 21:37:16 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1f4tYI-0000dr-2j for rs_out_1@blacksheep.org; Sat, 07 Apr 2018 20:31:06 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1f4tX4-0000dd-I3 for rsgb_lf_group@blacksheep.org; Sat, 07 Apr 2018 20:29:50 +0100 Received: from omr-a013e.mx.aol.com ([204.29.186.60]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.89) (envelope-from ) id 1f4tWy-0000vB-Er for rsgb_lf_group@blacksheep.org; Sat, 07 Apr 2018 20:29:48 +0100 Received: from mtaomg-aaa01.mx.aol.com (mtaomg-aaa01.mx.aol.com [172.27.1.227]) by omr-a013e.mx.aol.com (Outbound Mail Relay) with ESMTP id 095433800094 for ; Sat, 7 Apr 2018 15:29:38 -0400 (EDT) Received: from core-acc03b.mail.aol.com (core-acc03.mail.aol.com [172.26.125.13]) by mtaomg-aaa01.mx.aol.com (OMAG/Core Interface) with ESMTP id 9676038000082 for ; Sat, 7 Apr 2018 15:29:37 -0400 (EDT) Received: from 2.247.255.180 by webjasstg-vab12.srv.aolmail.net (10.96.25.79) with HTTP (WebMailUI); Sat, 07 Apr 2018 15:29:36 -0400 Date: Sat, 7 Apr 2018 15:29:37 -0400 From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-Id: <162a195deeb-1796-6200@webjasstg-vab12.srv.aolmail.net> In-Reply-To: <5AC8D995.2000309@posteo.de> MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [2.247.255.180] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1523129377; bh=//FuKp+41iJR8SeU2qoqKo3r5tNLejNEZQyvT7GUYsI=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=k/ZBkF4RxK9fA2pnwVfWq3EEeML1boefAj67sK8Bg4Vyg1/JIoBs0owkThAzpmg+4 xv/b+xmBrAgOZgit7QCQlBL2tL1ddQMZH28QBARmIqmzsE8U186tsu8Dq/+L+0WNi/ XLs/xtu2IovF4REkIAGfgu8FM7mU1jiwNfFG0FGI= x-aol-sid: 3039ac1b01e35ac91c212c18 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: WOW! Just reproduced Stefan's one-character message from Edgar's file. That's truly stunning! 73, Markus -----Ursprüngliche Mitteilung----- Von: DK7FC An: rsgb_lf_group Verschickt: Sa, 7. Apr 2018 16:51 Betreff: Re: VLF: EbNaut message attempt DL > VK7 [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (markusvester[at]aol.com) 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 46d617994b9fba079dc3ad7182acba54 Subject: Re: VLF: EbNaut message attempt DL > VK7 Content-Type: multipart/alternative; boundary="----=_Part_31123_1169770164.1523129376490" 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 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 ------=_Part_31123_1169770164.1523129376490 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable WOW! Just reproduced Stefan's one-character message from Edgar's file. That= 's truly stunning! 73, Markus=20 -----Urspr=C3=BCngliche Mitteilung-----=20 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 = night, the second day, the noise was 4 dB lower here. The first day produce= d 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 = left neighbour bin is stronger than the right neighbour bin. This comes fro= m the negative phase change that we can also see at NWC (19.8 kHz) from her= e. The more or less constant phase change during the transmission is equal = to a negative frequency offset, shifting some energy in the left neighbour = bin, which becomes already visible in 111 uHz. Thus i played a bit with a f= requency 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 fr= equency 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 f= alse 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 bet= ter results, so forget what i said above :-) There are 3 decodes all showin= g 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 f= or everyone here in the list. There are several EbNaut newcomers who like t= utorials to reproduce a decode :-)=20 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 =20 Am 05.04.2018 11:15, schrieb DK7FC:=20 Hi VLF,=20 Later we have to report about a spectacular success on the path from DK7FC= to Edgar J.T..=20 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 ------=_Part_31123_1169770164.1523129376490 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
WOW! Just reproduced Stefan's one-character= message from Edgar's file. That's truly stunning!

73, Mar= kus 


-----Urspr=C3= =BCngliche Mitteilung-----
Von: DK7FC <selberdenken@pos= teo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.o= rg>
Verschickt: Sa, 7. Apr 2018 16:51
Be= treff: 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 night, 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 left 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, shifting 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 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 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 false 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 better 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 for everyone here in the list. There are several EbNaut newcomers who like tutorials 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:
=20 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
------=_Part_31123_1169770164.1523129376490--