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From: "Markus Vester" <markusvester@aol.com>
To: <rsgb_lf_group@blacksheep.org>
Date: Fri, 30 Mar 2012 22:58:31 +0200
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Subject: LF: Fw: VLF, messages received 2012-03-25
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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
--
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<META http-equiv=3DContent-Type =
content=3Dtext/html;charset=3Diso-8859-1>
<META content=3D"MSHTML 6.00.6000.17108" name=3DGENERATOR></HEAD>
<BODY id=3DMailContainerBody=20
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bgColor=3D#ffffff leftMargin=3D0 topMargin=3D0 CanvasTabStop=3D"true"=20
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<DIV><FONT face=3DArial size=3D2>
<DIV style=3D"FONT: 10pt Tahoma">
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><FONT face=3DArial>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...</FONT></DIV>
<DIV style=3D"font-color: black"><FONT face=3DArial></FONT> </DIV>
<DIV style=3D"font-color: black"><FONT face=3DArial>73, Markus =
(DF6NM)</FONT></DIV>
<DIV style=3D"font-color: black"><B></B> </DIV>
<DIV style=3D"font-color: black"><B>From:</B> <A =
title=3Dpaul@abelian.netcom.co.uk=20
href=3D"wlmailhtml:{A95A445B-A1D3-49F1-BBF7-B2640059A0A4}mid://00000004/!=
x-usc:mailto:paul@abelian.netcom.co.uk">Paul</A>=20
</DIV>
<DIV><B>Sent:</B> Friday, March 30, 2012 10:48 PM</DIV>
<DIV><B>To:</B> <A=20
title=3D"wlmailhtml:{A95A445B-A1D3-49F1-BBF7-B2640059A0A4}mid://00000004/=
!x-usc:mailto:markusvester@aol.com STRG + Klicken, um Verkn=FCpfung =
zu folgen"=20
href=3D"wlmailhtml:{A95A445B-A1D3-49F1-BBF7-B2640059A0A4}mid://00000004/!=
x-usc:mailto:markusvester@aol.com">Markus=20
Vester</A> </DIV>
<DIV><B>Cc:</B> <A=20
title=3D"wlmailhtml:{A95A445B-A1D3-49F1-BBF7-B2640059A0A4}mid://00000004/=
!x-usc:mailto:lubomir.bobalik@rtv5.cz STRG + Klicken, um =
Verkn=FCpfung zu folgen"=20
href=3D"wlmailhtml:{A95A445B-A1D3-49F1-BBF7-B2640059A0A4}mid://00000004/!=
x-usc:mailto:lubomir.bobalik@rtv5.cz">Lubomir=20
Bobalik</A> </DIV>
<DIV><B>Subject:</B> Re: VLF, messages received =
2012-03-25</DIV></DIV></DIV>
<DIV><BR></DIV>> Would you mind us forwarding your notice to the LF=20
reflector?<BR><BR>Sure. any message from me, you can forward if you =
think it of=20
interest.<BR><BR>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.<BR><BR>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.<BR><BR>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.<BR><BR>Well =
done=20
both stations, hope we see more MFSK.<BR>--<BR>Paul=20
Nicholson<BR>--<BR></FONT></DIV>
<DIV style=3D"FONT: 10pt Tahoma">
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A =
title=3Dmarkusvester@aol.com=20
href=3D"mailto:markusvester@aol.com">Markus Vester</A> </DIV>
<DIV><B>Sent:</B> Friday, March 30, 2012 10:12 PM</DIV>
<DIV><B>To:</B> <A title=3Dpaul@abelian.netcom.co.uk=20
href=3D"mailto:paul@abelian.netcom.co.uk">Paul</A> ; <A=20
title=3Dlubomir.bobalik@rtv5.cz =
href=3D"mailto:lubomir.bobalik@rtv5.cz">Lubomir=20
Bobalik</A> </DIV>
<DIV><B>Subject:</B> Re: VLF, messages received =
2012-03-25</DIV></DIV></DIV>
<DIV><FONT face=3DArial size=3D2></FONT><FONT face=3DArial =
size=3D2></FONT><FONT=20
face=3DArial size=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT =
face=3DArial=20
size=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT face=3DArial=20
size=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT face=3DArial=20
size=3D2></FONT><FONT face=3DArial size=3D2></FONT><BR></DIV>
<DIV><FONT face=3DArial size=3D2>Paul,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>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. </FONT></DIV>
<DIV style=3D"FONT: 10pt Tahoma"><FONT face=3DArial></FONT><FONT=20
face=3DArial></FONT><FONT face=3DArial></FONT><FONT =
face=3DArial></FONT> </DIV>
<DIV style=3D"FONT: 10pt Tahoma">
<DIV><FONT face=3DArial>Would you mind us forwarding your notice to =
the LF=20
reflector?</FONT></DIV>
<DIV><FONT face=3DArial></FONT> </DIV>
<DIV><FONT face=3DArial>Thanks very much!</FONT></DIV>
<DIV><FONT face=3DArial></FONT> </DIV>
<DIV><FONT face=3DArial>Markus (DF6NM)</FONT></DIV>
<DIV><FONT face=3DArial></FONT><FONT face=3DArial></FONT><FONT=20
face=3DArial></FONT><FONT face=3DArial></FONT><FONT =
face=3DArial></FONT><FONT=20
face=3DArial></FONT><FONT face=3DArial></FONT><FONT =
face=3DArial></FONT><FONT=20
face=3DArial></FONT><FONT face=3DArial></FONT><FONT=20
face=3DArial></FONT><BR> </DIV>
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A =
title=3Dpaul@abelian.netcom.co.uk=20
href=3D"mailto:paul@abelian.netcom.co.uk">Paul</A> </DIV>
<DIV><B>Sent:</B> Friday, March 30, 2012 1:42 PM</DIV>
<DIV><B>To:</B> <A title=3Dlubomir.bobalik@rtv5.cz=20
href=3D"mailto:lubomir.bobalik@rtv5.cz">Lubomir Bobalik</A> </DIV>
<DIV><B>Cc:</B> <A title=3Dmarkusvester@aol.com=20
href=3D"mailto:markusvester@aol.com">Markus Vester</A> </DIV>
<DIV><B>Subject:</B> VLF, messages received 2012-03-25</DIV></DIV></DIV>
<DIV><FONT face=3DArial size=3D2></FONT><FONT face=3DArial =
size=3D2></FONT><FONT=20
face=3DArial size=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT =
face=3DArial=20
size=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT face=3DArial=20
size=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT face=3DArial=20
size=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT face=3DArial=20
size=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT face=3DArial=20
size=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT face=3DArial=20
size=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT face=3DArial=20
size=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT face=3DArial=20
size=3D2></FONT><FONT face=3DArial size=3D2></FONT><BR></DIV>Lubos, =
Markus,<BR><BR>I=20
ran my recording from the 25th through an MFSK37 decoder =
program. It=20
produced the following output:-<BR><BR>(asnr =3D amplitude S/N=20
ratio)<BR><BR>vtcodec: 2012-03-25_07:30:00.000 rxed [N] asnr =
2.87<BR>vtcodec:=20
2012-03-25_08:00:00.000 rxed [B] asnr 2.63<BR><BR>vtcodec:=20
2012-03-25_09:00:00.000 rxed [B] asnr 3.84<BR>vtcodec: =
2012-03-25_09:30:00.000=20
rxed [N] asnr 3.68<BR>vtcodec: 2012-03-25_10:00:00.000 rxed [M] asnr=20
4.46<BR><BR>vtcodec: 2012-03-25_11:00:00.000 rxed [R] asnr =
4.51<BR>vtcodec:=20
2012-03-25_11:30:00.000 rxed [O] asnr 4.30<BR><BR>vtcodec:=20
2012-03-25_12:30:00.000 rxed [R] asnr 3.81<BR>vtcodec: =
2012-03-25_13:00:00.000=20
rxed [T] asnr 2.21<BR>vtcodec: 2012-03-25_13:30:00.000 rxed [U] asnr=20
2.21<BR><BR>The loops were aligned approximately 110 deg which was =
sufficient to=20
reject another signal on 8970.022.<BR>--<BR>Paul=20
Nicholson<BR>--<BR></BODY></HTML>
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