Message-ID: <07E161587DA646DCBC41A19A9D7EC3C2@White>
From: "Markus Vester" <markusvester@aol.com>
To: <rsgb_lf_group@blacksheep.org>
References: <4F801932.4814.48CC805@mike.dennison.ntlworld.com>
Date: Sat, 7 Apr 2012 12:25:06 +0200
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Subject: Re: LF: Argo vs SpecLab - DCF39 bursts
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Hi Mike,

you have probably selected Argo's visual AGC button on the bottom left, =
which is on by default. This does not really suppress interference, but =
scales each display column to the same average brightness of the noise. =
So during a strong noise burst, the brightness stays the same but the =
signals disappear.=20

Speclab also has a similar visual AGC option. The advantage is that you =
wouldn't have to adjust gain between day and night, but I rarely use it =
because I like to see whether the signal went down or the noise went up. =


As you can guess, DCF (and also HGA) sidebands are really big here. For =
the LF grabber I am using neither analog or digital AGC nor clipper, =
just the SpecLab noise blanker alone. It gets the full SSB bandwidth and =
is set to fast rampdown / rampup times (2 ms), so that it can recover =
between individual clicks within an FSK bursts, minimizing signal loss. =
The NB threshold is normally set to 9 dB above average.

Best wishes,
Markus (DF6NM)


From: Mike Dennison=20
Sent: Saturday, April 07, 2012 11:38 AM
To: rsgb_lf_group@blacksheep.org=20
Subject: LF: Argo vs SpecLab


I have recently being playing with the settings in SpecLab, and have=20
managed to reduce the effect of some local QRM. However, I am still=20
plagued by DCF39 data bursts. When using Argo (1.3.7) these are=20
almost invisible, but SpecLab still displays them.

I have the SpecLab Limiter set very hard, and the Noise Blanker on,=20
and this helps, but it is still nowhere near as good as Argo in=20
taking out the data bursts.

Any ideas?

Mike, G3XDV
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D



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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<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
style=3D"PADDING-RIGHT: 10px; PADDING-LEFT: 10px; PADDING-TOP: 15px"=20
bgColor=3D#ffffff leftMargin=3D0 topMargin=3D0 CanvasTabStop=3D"true"=20
name=3D"Compose message area">
<DIV><FONT face=3DArial size=3D2>Hi Mike,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>you have&nbsp;probably&nbsp;selected =
Argo's visual=20
AGC button on the bottom left, which is on by default. This does not =
really=20
suppress interference, but&nbsp;scales each display column to the same =
average=20
brightness of the noise. </FONT><FONT face=3DArial size=3D2>So during a =
strong noise=20
burst, the brightness stays the same but the signals&nbsp;disappear.=20
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Speclab also has a similar visual AGC =
option.=20
</FONT><FONT face=3DArial size=3D2>The advantage&nbsp;is that&nbsp;you =
wouldn't have=20
to adjust gain between day and night, but I rarely use it because I like =

to&nbsp;see whether the&nbsp;signal went down or the noise went=20
up.&nbsp;</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>As you can guess, DCF (and also HGA) =
sidebands are=20
really big here. For the LF grabber I am using neither analog or digital =
AGC nor=20
clipper, just the SpecLab noise blanker alone.&nbsp;It gets the full SSB =

bandwidth and is set to&nbsp;fast rampdown / rampup times (2 ms), so =
that it can=20
recover between individual clicks within an FSK&nbsp;bursts, minimizing =
signal=20
loss. The NB threshold is normally set to 9 dB above =
average.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Best wishes,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Markus (DF6NM)</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV style=3D"FONT: 10pt Tahoma">
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A=20
title=3D"mailto:mike.dennison@ntlworld.com&#10;STRG + Klicken, um =
Verkn=FCpfung zu folgen"=20
href=3D"mailto:mike.dennison@ntlworld.com">Mike Dennison</A> </DIV>
<DIV><B>Sent:</B> Saturday, April 07, 2012 11:38 AM</DIV>
<DIV><B>To:</B> <A=20
title=3D"mailto:rsgb_lf_group@blacksheep.org&#10;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> LF: Argo vs SpecLab</DIV></DIV></DIV>
<DIV><FONT face=3DArial size=3D2></FONT><BR></DIV>I have recently being =
playing with=20
the settings in SpecLab, and have <BR>managed to reduce the effect of =
some local=20
QRM. However, I am still <BR>plagued by DCF39 data bursts. When using =
Argo=20
(1.3.7) these are <BR>almost invisible, but SpecLab still displays=20
them.<BR><BR>I have the SpecLab Limiter set very hard, and the Noise =
Blanker on,=20
<BR>and this helps, but it is still nowhere near as good as Argo in =
<BR>taking=20
out the data bursts.<BR><BR>Any ideas?<BR><BR>Mike,=20
G3XDV<BR>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<BR><BR><BR></BODY></HTML>

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