MIME-Version: 1.0
In-Reply-To: <505F86FA.2030007@iup.uni-heidelberg.de>
References: <505F86FA.2030007@iup.uni-heidelberg.de>
Date: Mon, 24 Sep 2012 01:38:17 +0300
Message-ID: <CAK59VFPspOw6txqV2eVVFfwt_8uPoCZ-unmqduxyco7FtOvjDg@mail.gmail.com>
From: Chris 4X1RF <chrisgomy@gmail.com>
To: rsgb_lf_group@blacksheep.org
Cc: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
Subject: Re: LF: SL NB in WSPR-32 ?
Content-Type: multipart/alternative; boundary=f46d0430896e1418ea04ca662172
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


--f46d0430896e1418ea04ca662172
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Hi Stefan,

I'm using SL as part of the LF receiver only in Bucharest now so I can't
check this on the Haifa receiver. I have enabled the NB on the SL instance
delivering audio to YO/4X1RF/32 WSPR-32 monitoring.

Not so sure we'll see any difference and/or how to quantify it given the
quite deep and quick QSB today.

73s
Chris 4X1RF



On Mon, Sep 24, 2012 at 1:02 AM, Stefan Sch=E4fer <
Stefan.Schaefer@iup.uni-heidelberg.de> wrote:

>  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 wors=
e
> but i can't imagine.
>
> What do you and Markus and others think?
>
> 73, Stefan/DK7FC
>
>

--f46d0430896e1418ea04ca662172
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hi Stefan,<br></div><div><br></div><div>I&#39;m using=
 SL as part of the LF receiver only in Bucharest now so I can&#39;t check t=
his on the Haifa receiver. I have enabled the NB on the SL instance deliver=
ing audio to YO/4X1RF/32 WSPR-32 monitoring.=A0</div>
<div><br></div><div>Not so sure we&#39;ll see any difference and/or how to =
quantify it given the quite deep and quick QSB today.=A0</div><div><br></di=
v><div>73s</div><div>Chris 4X1RF</div><div><br></div><div><br></div><br><di=
v class=3D"gmail_quote">
On Mon, Sep 24, 2012 at 1:02 AM, Stefan Sch=E4fer <span dir=3D"ltr">&lt;<a =
href=3D"mailto:Stefan.Schaefer@iup.uni-heidelberg.de" target=3D"_blank">Ste=
fan.Schaefer@iup.uni-heidelberg.de</a>&gt;</span> wrote:<br><blockquote cla=
ss=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pa=
dding-left:1ex">






<div bgcolor=3D"#ffffff" text=3D"#000000">
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&#39;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&#39;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&#39;t imagine.<br>
<br>
What do you and Markus and others think?<br>
<br>
73, Stefan/DK7FC<br>
<br>
</div>

</blockquote></div><br></div>

--f46d0430896e1418ea04ca662172--