Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-1.8 required=5.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,RCVD_IN_DNSWL_MED, RCVD_IN_SORBS_SPAM,SPF_PASS,T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: EATSERVER: mailn 1166; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v4PNKVHt011782 for ; Fri, 26 May 2017 01:20:32 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dE1zX-0008D2-1o for rs_out_1@blacksheep.org; Fri, 26 May 2017 00:16:27 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dE1yl-0008Ct-GO for rsgb_lf_group@blacksheep.org; Fri, 26 May 2017 00:15:39 +0100 Received: from omr-m008e.mx.aol.com ([204.29.186.7]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.89) (envelope-from ) id 1dE1yf-0002dQ-GN for rsgb_lf_group@blacksheep.org; Fri, 26 May 2017 00:15:36 +0100 Received: from mtaomg-mba02.mx.aol.com (mtaomg-mba02.mx.aol.com [172.26.133.112]) by omr-m008e.mx.aol.com (Outbound Mail Relay) with ESMTP id ECA6B3800165 for ; Thu, 25 May 2017 19:15:30 -0400 (EDT) Received: from core-ace07g.mail.aol.com (core-ace07.mail.aol.com [172.27.23.7]) by mtaomg-mba02.mx.aol.com (OMAG/Core Interface) with ESMTP id 7F46E38000082 for ; Thu, 25 May 2017 19:15:30 -0400 (EDT) Received: from 188.192.95.60 by webprd-m54.mail.aol.com (10.74.5.47) with HTTP (WebMailUI); Thu, 25 May 2017 19:15:30 -0400 Date: Thu, 25 May 2017 19:15:30 -0400 From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-Id: <15c41e4c309-53f8-14458@webprd-m54.mail.aol.com> In-Reply-To: <59273F3E.8000608@posteo.de> MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [188.192.95.60] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1495754130; bh=VMRlj7OSukrhJs5Ebei9j0Uf1ELsIEm9fqLzjNmGtiY=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=reEF9RMi+LNP220Alh6son4e1XIAuiIvxhkpVDL55vjHQpIGvdq2ePJ+cC3KftE/R /AceAvE/hgxs+AzSMSofUoL4cM6g3eSuPUZCWzGPnEiw7IT7hR9z7PAXac4IEgkHy8 C/1uxixLKjmdzRctg442z2NDGtbsj71N2Ymoi3M4= x-aol-sid: 3039ac1a8570592765924e54 X-Scan-Signature: 3d0ae5b4ae8b74dc4bf5c1dbe3fef430 Subject: Re: VLF: EbNaut tonite, 'SMS' via VLF Content-Type: multipart/alternative; boundary="----=_Part_102139_1165619242.1495754130183" 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 X-Scanned-By: MIMEDefang 2.75 Status: RO X-Status: X-Keywords: X-UID: 11769 ------=_Part_102139_1165619242.1495754130183 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable The transmission was recorded at DL0AO using a synthetic cardioid antenna. = Unfortunately my laptop with 8 GB RAM ran out of memory after starting the = decoder. If someone with a bigger machine would like to help out, here's ou= r wav: http://df6nm.bplaced.net/VLF/fec_tests/dl0ao_05250424.wav (129 kB) Best 73, Markus (DF6NM) -----Urspr=C3=BCngliche Mitteilung-----=20 Von: DK7FC An: rsgb_lf_group Verschickt: Do, 25. Mai 2017 22:33 Betreff: Re: VLF: EbNaut tonite, 'SMS' via VLF Hi Paul, VLF, That's amazing! A 'SMS' via VLF over ~ 25 wavelengths distance on the 36=20 km band, from a fixed antenna, in less than a day and without stacking!=20 Again i think back to 2010 :-) Such a result in late May! We used to say that VLF won't work in summer,=20 because of the high QRN levels... I'm impressed! 73, Stefan Am 25.05.2017 21:50, schrieb Paul Nicholson: > > Stefan wrote: > > > Well, let's try something for the record list again: > > > f =3D 8270.100000 Hz > > Start time: 24.May.2017 20:00:00 UTC > > Symbol period: 10 s > > Characters: 160 ( 1 SMS length :-) ) > > CRC bits: 10 > > Coding 8K21A > > Duration: 22h > > Copied > > "THIS IS THE FIRST SMS SENT OVER VLF BY RADIO AMATEURS. > THANKS TO PAUL NICHOLSON, DL4YHF AND DF6NM FOR SOFTWARE > DEVELOPMENTS. JOIN IN THE EXPERIMENTS! 73, DK7FC" > > Rank 0, constant reference phase; > Eb/N0 =3D +0.6 dB; > BER 27.3%; > carrier S/N: 30.17 dB in 12.6 uHz, > -18.81 dB in 1Hz, > -52.79 dB in 2.5kHz; > > That's a new record message length for VLF. > > --=20 > Paul Nicholson > --=20 > ------=_Part_102139_1165619242.1495754130183 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
The transmission was recorded at DL0AO using a synt= hetic cardioid antenna. Unfortunately my laptop with 8 GB RAM ran= out of memory after starting the decoder. If someone with a bigger machine= would like to help out, here's our wav:
http://df6nm.bplaced.net/VLF/fe= c_tests/dl0ao_05250424.wav  (129 kB)

Best 73,
Markus (DF6NM)=


-----Urspr=C3=BCngliche Mitteilung-----
Von: DK7FC <selb= erdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.or= g>
Verschickt: Do, 25. Mai 2017 22:33
Betreff: Re: VLF: EbNaut ton= ite, 'SMS' via VLF

Hi Paul, VLF,

That's amazing! A 'SMS= ' via VLF over ~ 25 wavelengths distance on the 36
km band, from a fixe= d antenna, in less than a day and without stacking!
Again i think back = to 2010 :-)
Such a result in late May! We used to say that VLF won't wor= k in summer,
because of the high QRN levels...
I'm impressed!
73, Stefan

Am 25.05.2017 21:50, schrieb Paul Nicholson:
>
= > Stefan wrote:
>
> > Well, let's try something for the r= ecord list again:
>
> > f =3D 8270.100000 Hz
> > St= art time: 24.May.2017 20:00:00 UTC
> > Symbol period: 10 s
&g= t; > Characters: 160 ( 1 SMS length :-) )
> > CRC bits: 10
&= gt; > Coding 8K21A
> > Duration: 22h
>
> Copied
= >
> "THIS IS THE FIRST SMS SENT OVER VLF BY RADIO AMATEURS.
&g= t; THANKS TO PAUL NICHOLSON, DL4YHF AND DF6NM FOR SOFTWARE
> DEVE= LOPMENTS. JOIN IN THE EXPERIMENTS! 73, DK7FC"
>
> Rank 0, cons= tant reference phase;
> Eb/N0 =3D +0.6 dB;
> BER 27.3%;
>= carrier S/N: 30.17 dB in 12.6 uHz,
> -18.81 dB in 1Hz,> -52.79 dB in 2.5kHz;
>
> That's a new record= message length for VLF.
>
> --
> Paul Nicholson
>= --
>

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