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: INFN-TO: mailn 1233; 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 v4TCrL8F027844 for ; Mon, 29 May 2017 14:53:22 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dFK5Z-0003b0-Ho for rs_out_1@blacksheep.org; Mon, 29 May 2017 13:48:01 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dFK5A-0003ar-TK for rsgb_lf_group@blacksheep.org; Mon, 29 May 2017 13:47:36 +0100 Received: from omr-m011e.mx.aol.com ([204.29.186.11]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.89) (envelope-from ) id 1dFK55-0000a3-Ap for rsgb_lf_group@blacksheep.org; Mon, 29 May 2017 13:47:34 +0100 Received: from mtaomg-mab02.mx.aol.com (mtaomg-mab02.mx.aol.com [172.26.249.84]) by omr-m011e.mx.aol.com (Outbound Mail Relay) with ESMTP id 21CDD38000BD for ; Mon, 29 May 2017 08:47:29 -0400 (EDT) Received: from core-ace07g.mail.aol.com (core-ace07.mail.aol.com [172.27.23.7]) by mtaomg-mab02.mx.aol.com (OMAG/Core Interface) with ESMTP id A8C1D38000082; Mon, 29 May 2017 08:47:28 -0400 (EDT) Received: from 80.146.228.71 by webprd-m27.mail.aol.com (10.74.5.41) with HTTP (WebMailUI); Mon, 29 May 2017 08:47:28 -0400 Date: Mon, 29 May 2017 08:47:28 -0400 From: Markus Vester To: markusvester@aol.com, rsgb_lf_group@blacksheep.org Message-Id: <15c543f3844-234d-1bd23@webprd-m27.mail.aol.com> In-Reply-To: <15c4274112f-72c9-13053@webprd-m71.mail.aol.com> MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [80.146.228.71] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1496062049; bh=KassTZ7uy2YGrRrlI2KRoW83S/YSGVyFj0uezOK5J+E=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=OeakGx+hSE/tGqaCduYMiOD+Wf17+FXE18nA1tBrwJlHtjA1UH42AlXI6MkdWI1VM ODhpYNTND6zL6G7VRbl2qYGkZdqVmDXnvscbpxgx12AhAB4OlEXML2hNU0vG7HgeT5 WE4Y/c2IgdMOEs5xY6Wc/+i/byPfJLiSupjym4Ds= x-aol-sid: 3039ac1af954592c186060a7 X-Scan-Signature: 2ee80849a5d572dbc974bb207a527753 Subject: Re: VLF: EbNaut tonite, 'SMS' via VLF Content-Type: multipart/alternative; boundary="----=_Part_138177_639076313.1496062048307" 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: 11815 ------=_Part_138177_639076313.1496062048307 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Paul, > Do you have a version with higher sample rate? Stitching together three shorter higher-bandwidth recordings from DL0AO, I = managed to produce a seamless wav with 0.514 Hz samplerate: http://df6nm.bplaced.net/VLF/fec_tests/dl0ao_170524-25_join31uHz_wav.zip Accounting for 7.8 s lag, this should require 2056.2 s start offset and 0.1= Hz frequency offset. =20 Would you like to look again? Best regards, Markus -----Urspr=C3=BCngliche Mitteilung-----=20 Von: Markus Vester An: rsgb_lf_group Verschickt: Fr, 26. Mai 2017 3:52 Betreff: Re: VLF: EbNaut tonite, 'SMS' via VLF Unfortunately not, the spectrum has been decimated to 0.1524 Hz bandwidth b= efore the export. I could do sinc interpolation by zero-padding the spectru= m but I guess that won't help much. However I should have mentioned that SpecLab FFT recordings are usually del= ayed by a four sample latency. In this case it is ~26 seconds behind the fi= le timestamp, which would surely prevent a successful decode if not account= ed for in the start offset. Best 73, Markus=20 -----Urspr=C3=BCngliche Mitteilung-----=20 Von: Paul Nicholson An: rsgb_lf_group Verschickt: Fr, 26. Mai 2017 2:08 Betreff: Re: VLF: EbNaut tonite, 'SMS' via VLF > The transmission was recorded at DL0AO using a synthetic > cardioid antenna. > here's our wav: > http://df6nm.bplaced.net/VLF/fec_tests/dl0ao_05250424.wav (129 kB) This doesn't seem to want to decode. Do you have a version with higher sample rate? -- Paul Nicholson -- ------=_Part_138177_639076313.1496062048307 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Hi Paul,

> Do you have a version with higher s= ample rate?

Stitching together three shorter higher-bandwi= dth recordings from DL0AO, I managed to produce a seamless wav with 0.514 H= z samplerate:
 http://df6nm.bplaced.net/VLF/fec_tests/dl0ao_170524-= 25_join31uHz_wav.zip
Accounting for 7.8 s lag, this should require = 2056.2 s start offset and 0.1 Hz frequency offset.  

Would= you like to look again?

Best regards,
Markus

-----Urspr= =C3=BCngliche Mitteilung-----
Von: Markus Vester <markusvester@aol.c= om>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschi= ckt: Fr, 26. Mai 2017 3:52
Betreff: Re: VLF: EbNaut tonite, 'SMS' via VL= F

Unfortunately not, t= he spectrum has been decimated to 0.1524 Hz bandwidth before the export. I = could do sinc interpolation by zero-padding the spectrum but I guess that w= on't help much.

However I should have mentioned that SpecL= ab FFT recordings are usually delayed by a four sample laten= cy. In this case it is ~26 seconds behind the file timestamp,&nbs= p;which would surely prevent a successful decode if not accounted for&= nbsp;in the start offset.

Best 73,
Markus 


-----U= rspr=C3=BCngliche Mitteilung-----
Von: Paul Nicholson <vlf0403@abelian.org>
An: rsgb_lf_group = <rsgb_lf_group@blackshee= p.org>
Verschickt: Fr, 26. Mai 2017 2:08
Betreff: Re: VLF: EbN= aut tonite, 'SMS' via VLF


> The transmission was recor= ded at DL0AO using a synthetic
> cardioid antenna.

> her= e's our wav:
> http://df6nm= .bplaced.net/VLF/fec_tests/dl0ao_05250424.wav (129 kB)

This doe= sn't seem to want to decode. Do you have a version with
higher sample r= ate?

--
Paul Nicholson
--

------=_Part_138177_639076313.1496062048307--