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Content preview: Hi Graham, well opds "dBOp" has been calibrated to display
SNR on the same "average power" scale as Opera, ie carrier power in 2.5 kHz
minus 4 dB. However I concede that opds SNR measurements are not always accurate.
Especially with either strong signals, or unstable / incoherent transmissions,
the estimate of the carrier power or noise can go wrong by several dB. [...]
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Subject: Re: LF: 27.925 is correct dial
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Hi Graham,
well opds "dBOp" has been calibrated to display SNR on the same "average =
power" scale as Opera, ie carrier power in 2.5 kHz minus 4 dB. However I =
concede that opds SNR measurements are not always accurate. Especially =
with either strong signals, or unstable / incoherent transmissions, the =
estimate of the carrier power or noise can go wrong by several dB.
You mentioned improvements to the decoding algorithm in the latest Opera =
version - can you give details?
73, Markus
From: Graham=20
Sent: Saturday, March 08, 2014 7:19 PM
To: rsgb_lf_group@blacksheep.org=20
Subject: Re: LF: 27.925 is correct dial
...
OP32 min as used on 136 KHz , gives ~ -41 dB min , so OP2H=20
should run - 47 , I note Dex reached -48 , which is -54/55 on=20
Marcus's scale
Tnx , G,
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Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
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http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.23562"></HEAD>
<BODY style=3D"PADDING-LEFT: 10px; PADDING-RIGHT: 10px; PADDING-TOP: =
15px"=20
id=3DMailContainerBody leftMargin=3D0 topMargin=3D0 bgColor=3D#ffffff=20
CanvasTabStop=3D"true" name=3D"Compose message area">
<DIV><FONT size=3D2 face=3DArial>Hi Graham,</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT> </DIV>
<DIV><FONT size=3D2 face=3DArial>well opds "dBOp" has been calibrated=20
to display SNR on the same "average power" scale as Opera, ie =
carrier=20
power in 2.5 kHz minus 4 dB. </FONT><FONT size=3D2 face=3DArial>However=20
I concede that opds SNR measurements are not always=20
accurate. Especially with either strong signals, or =
unstable /=20
incoherent transmissions, the estimate of the carrier power or noise can =
go=20
wrong by several dB.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT> </DIV>
<DIV><FONT size=3D2 face=3DArial>You mentioned improvements to the =
decoding=20
algorithm in the latest Opera version - can you give =
details?</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></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><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 =
face=3DArial></FONT><FONT=20
face=3DArial>73, Markus</FONT></DIV>
<DIV style=3D"FONT: 10pt Tahoma">
<DIV><FONT face=3DArial></FONT><BR></DIV>
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A =
title=3Dg8fzk@g8fzk.fsnet.co.uk=20
href=3D"mailto:g8fzk@g8fzk.fsnet.co.uk">Graham</A> </DIV>
<DIV><B>Sent:</B> Saturday, March 08, 2014 7:19 PM</DIV>
<DIV><B>To:</B> <A=20
title=3D"mailto:rsgb_lf_group@blacksheep.org STRG + Klicken, um =
Verkn=FCpfung zu folgen"=20
href=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org=
</A>=20
</DIV>
<DIV><B>Subject:</B> Re: LF: 27.925 is correct dial</DIV></DIV></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT><FONT size=3D2 =
face=3DArial></FONT><FONT size=3D2=20
face=3DArial></FONT><FONT size=3D2 face=3DArial></FONT><FONT size=3D2=20
face=3DArial></FONT><BR></DIV>
<DIV>...</DIV>
<DIV>OP32 min as used on 136 =
KHz ,=20
gives ~ -41 dB min , so OP2H =
<BR>should=20
run - 47 , I note Dex reached -48 , which =
is =20
-54/55 on <BR>Marcus's scale<BR><BR>Tnx ,=20
G,<BR><BR><BR></DIV></BODY></HTML>
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