Message-ID: <505F86FA.2030007@iup.uni-heidelberg.de>
Date: Mon, 24 Sep 2012 00:02:34 +0200
From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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To: Chris Gomoiu <chrisgomy@gmail.com>
CC: rsgb_lf_group@blacksheep.org
Subject: LF: SL NB in WSPR-32 ?
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Hello Chris,

I wonder if there could be an improvement by using the SpecLab noise 
reduction technics in series to the audio line to the WSPR program.

Would you like to try that? For me it makes no sense, because Markus is 
+10 dB S/N here ;-)

You're already running the EU60 SL instance. This one adds a bandpass of 
about 2.5 kHz width to the wideband spectrum of your receivers in 4X and 
YO. Behind this filter there is the Noiseblanker which improves 
QRSS/DFCW reception by _at least_ 6 dB at nighttime, as we know. If you 
put the sound output of this SL instance to VAC2-in and define it 
VAC2-out as the standard audio device, then it should work. Of course 
the sound output in SL must be enabled.

If WSPR limits the input spectrum to 200 Hz, like we do in the IQ 
soundfile generated by sndinput, then there can't be adequate sferic 
blanking because 200 Hz is to narrow. Sferic blanking may be not such an 
advantage on HF, at least on the higher frequencies.

It would be interesting to see the difference. Maybe it makes things 
worse but i can't imagine.

What do you and Markus and others think?

73, Stefan/DK7FC


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Hello Chris, <br>
<br>
I wonder if there could be an improvement by using the SpecLab noise
reduction technics in series to the audio line to the WSPR program.<br>
<br>
Would you like to try that? For me it makes no sense, because Markus is
+10 dB S/N here ;-)<br>
<br>
You're already running the EU60 SL instance. This one adds a bandpass
of about 2.5 kHz width to the wideband spectrum of your receivers in 4X
and YO. Behind this filter there is the Noiseblanker which improves
QRSS/DFCW reception by <u>at least</u> 6 dB at nighttime, as we know.
If you put the sound output of this SL instance to VAC2-in and define
it VAC2-out as the standard audio device, then it should work. Of
course the sound output in SL must be enabled.<br>
<br>
If WSPR limits the input spectrum to 200 Hz, like we do in the IQ
soundfile generated by sndinput, then there can't be adequate sferic
blanking because 200 Hz is to narrow. Sferic blanking may be not such
an advantage on HF, at least on the higher frequencies.<br>
<br>
It would be interesting to see the difference. Maybe it makes things
worse but i can't imagine.<br>
<br>
What do you and Markus and others think?<br>
<br>
73, Stefan/DK7FC<br>
<br>
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