Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dk02.r1000.mx.aol.com (Internet Inbound) with ESMTP id 3743038000099; Fri, 30 Mar 2012 17:00:23 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SDiuH-0006sD-57 for rs_out_1@blacksheep.org; Fri, 30 Mar 2012 21:58:49 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SDiuF-0006s4-QZ for rsgb_lf_group@blacksheep.org; Fri, 30 Mar 2012 21:58:47 +0100 Received: from imr-ma03.mx.aol.com ([64.12.206.41]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1SDiuD-0003QE-2M for rsgb_lf_group@blacksheep.org; Fri, 30 Mar 2012 21:58:47 +0100 Received: from mtaout-da03.r1000.mx.aol.com (mtaout-da03.r1000.mx.aol.com [172.29.51.131]) by imr-ma03.mx.aol.com (8.14.1/8.14.1) with ESMTP id q2UKwa2a004058 for ; Fri, 30 Mar 2012 16:58:36 -0400 Received: from White (nrbg-4dbf1ffa.pool.mediaWays.net [77.191.31.250]) by mtaout-da03.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id E49CBE0000BA for ; Fri, 30 Mar 2012 16:58:32 -0400 (EDT) Message-ID: From: "Markus Vester" To: Date: Fri, 30 Mar 2012 22:58:31 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 12.0.1606 X-MimeOLE: Produced By Microsoft MimeOLE V12.0.1606 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20110426; t=1333141116; bh=LIbpSAdJU5j1NbgUzgh2WM6fV1SocK9xCe27qxtvobI=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=XBr6mXBW2fQWAHRjZveaJZ3FVDY/KjZ0RedbFp/5iPl89odU+DdahomGQoX8BChDk oDkvZstfI1PhhaV5G10Gsz97p7HEw6lk8+iWrw4tMz3lHJH1VdGkNhAHBizKEbnZrr x1nroHO9Dgg4jhMsGawXWH/C3VibvN+GgUC4IX4I= X-AOL-SCOLL-SCORE: 1:2:449140864:93952408 X-AOL-SCOLL-URL_COUNT: 3 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: Fw: VLF, messages received 2012-03-25 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000D_01CD0EC8.A062CCD0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_40_50,HTML_MESSAGE, MISSING_OUTLOOK_NAME 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 x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 1:2:474415936:93952408 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d309.2 ; domain : mx.aol.com DKIM : fail x-aol-sid: 3039ac1db4064f761ee65cf6 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Dies ist eine mehrteilige Nachricht im MIME-Format. ------=_NextPart_000_000D_01CD0EC8.A062CCD0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I was amazed to learn from Paul Nicholson that he was able to decode the = complete MFSK-37 QSO between OK2BVG and myself... 73, Markus (DF6NM) From: Paul=20 Sent: Friday, March 30, 2012 10:48 PM To: Markus Vester=20 Cc: Lubomir Bobalik=20 Subject: Re: VLF, messages received 2012-03-25 > Would you mind us forwarding your notice to the LF reflector? Sure. any message from me, you can forward if you think it of interest. Yes I was surprised it decoded correctly at the first attempt. Was = thinking S/N would be too low and expected also to have to notch out = 8970.022. BNM and RO were reliable copy, but NB and especially TU were lucky, with = the 'winning' bin only 2.2 times the mean amplitude of the other 36 = bins, there were plenty of chances to get the T and U wrong. I used a program written some months ago - when you were experimenting = with simulations of PSK and MFSK. I wrote it to test your error-rate = predictions (with which it agreed perfectly). I made a minor change from = MFSK64 to MFSK37 and let it run over the recorded signal (mixed to a = loop alignment of 110 deg and the usual sferic blanking recipe) and out = came the message first time. Well done both stations, hope we see more MFSK. -- Paul Nicholson -- From: Markus Vester=20 Sent: Friday, March 30, 2012 10:12 PM To: Paul ; Lubomir Bobalik=20 Subject: Re: VLF, messages received 2012-03-25 Paul, wow, that's impressive! I would not have thought that this is possible - = at your distance you can decode the complete message, including the = "TU", which had drowned in the afternoon noise in OK.=20 Would you mind us forwarding your notice to the LF reflector? Thanks very much! Markus (DF6NM) =20 From: Paul=20 Sent: Friday, March 30, 2012 1:42 PM To: Lubomir Bobalik=20 Cc: Markus Vester=20 Subject: VLF, messages received 2012-03-25 Lubos, Markus, I ran my recording from the 25th through an MFSK37 decoder program. It = produced the following output:- (asnr =3D amplitude S/N ratio) vtcodec: 2012-03-25_07:30:00.000 rxed [N] asnr 2.87 vtcodec: 2012-03-25_08:00:00.000 rxed [B] asnr 2.63 vtcodec: 2012-03-25_09:00:00.000 rxed [B] asnr 3.84 vtcodec: 2012-03-25_09:30:00.000 rxed [N] asnr 3.68 vtcodec: 2012-03-25_10:00:00.000 rxed [M] asnr 4.46 vtcodec: 2012-03-25_11:00:00.000 rxed [R] asnr 4.51 vtcodec: 2012-03-25_11:30:00.000 rxed [O] asnr 4.30 vtcodec: 2012-03-25_12:30:00.000 rxed [R] asnr 3.81 vtcodec: 2012-03-25_13:00:00.000 rxed [T] asnr 2.21 vtcodec: 2012-03-25_13:30:00.000 rxed [U] asnr 2.21 The loops were aligned approximately 110 deg which was sufficient to = reject another signal on 8970.022. -- Paul Nicholson -- ------=_NextPart_000_000D_01CD0EC8.A062CCD0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I was amazed to = learn from Paul=20 Nicholson that he was able to decode the complete MFSK-37 QSO=20 between OK2BVG and myself...
 
73, Markus = (DF6NM)
 
From: Paul=20
Sent: Friday, March 30, 2012 10:48 PM
To: Markus=20 Vester
Cc: Lubomir=20 Bobalik
Subject: Re: VLF, messages received = 2012-03-25

> Would you mind us forwarding your notice to the LF=20 reflector?

Sure. any message from me, you can forward if you = think it of=20 interest.

Yes I was surprised it decoded correctly at the first = attempt.=20 Was thinking S/N would be too low and expected also to have to notch out = 8970.022.

BNM and RO were reliable copy, but NB and especially TU = were=20 lucky, with the 'winning' bin only 2.2 times the mean amplitude of the = other 36=20 bins, there were plenty of chances to get the T and U wrong.

I = used a=20 program written some months ago - when you were experimenting with = simulations=20 of PSK and MFSK. I wrote it to test your error-rate predictions (with = which it=20 agreed perfectly). I made a minor change from MFSK64 to MFSK37 and let = it run=20 over the recorded signal (mixed to a loop alignment of 110 deg and the = usual=20 sferic blanking recipe) and out came the message first time.

Well = done=20 both stations, hope we see more MFSK.
--
Paul=20 Nicholson
--
Sent: Friday, March 30, 2012 10:12 PM
To: Paul ; Lubomir=20 Bobalik
Subject: Re: VLF, messages received = 2012-03-25

Paul,
 
wow, that's impressive! I would not = have thought=20 that this is possible - at your distance you can decode the = complete=20 message, including the "TU", which had drowned in the afternoon = noise in=20 OK.
 
Would you mind us forwarding your notice to = the LF=20 reflector?
 
Thanks very much!
 
Markus (DF6NM)

 
From: Paul
Sent: Friday, March 30, 2012 1:42 PM
Subject: VLF, messages received 2012-03-25

Lubos, = Markus,

I=20 ran my recording from the 25th through an MFSK37 decoder = program.   It=20 produced the following output:-

(asnr =3D amplitude S/N=20 ratio)

vtcodec: 2012-03-25_07:30:00.000 rxed [N] asnr = 2.87
vtcodec:=20 2012-03-25_08:00:00.000 rxed [B] asnr 2.63

vtcodec:=20 2012-03-25_09:00:00.000 rxed [B] asnr 3.84
vtcodec: = 2012-03-25_09:30:00.000=20 rxed [N] asnr 3.68
vtcodec: 2012-03-25_10:00:00.000 rxed [M] asnr=20 4.46

vtcodec: 2012-03-25_11:00:00.000 rxed [R] asnr = 4.51
vtcodec:=20 2012-03-25_11:30:00.000 rxed [O] asnr 4.30

vtcodec:=20 2012-03-25_12:30:00.000 rxed [R] asnr 3.81
vtcodec: = 2012-03-25_13:00:00.000=20 rxed [T] asnr 2.21
vtcodec: 2012-03-25_13:30:00.000 rxed [U] asnr=20 2.21

The loops were aligned approximately 110 deg which was = sufficient to=20 reject another signal on 8970.022.
--
Paul=20 Nicholson
--
------=_NextPart_000_000D_01CD0EC8.A062CCD0--