Message-ID: <507D9B44.4020803@iup.uni-heidelberg.de>
Date: Tue, 16 Oct 2012 19:37:08 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: WSPR on LF
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LF,

Does someone join in on LF WSPR? There are many active RX stations! 
Eddie/G3ZJO, what about you? Your results have been good on MF. On LF 
the ERP will be 10 dB lower (ish) if the TX pwr is the same but i expect 
that you will have quite good chances in the groundwave range.

There is a very high LF/MF and digimode appliance operator density in 
the UK ;-) Also in Germany and the Netherlands and France. It looks like 
we (these countries) make the highest density of active LF/MF amateurs 
in the world, except Tokyo city of course :-)

73, Stefan/DK7FC


Am 16.10.2012 15:48, schrieb George Szymanski:
> You never know Stefan I might get a weak trace from you overnight!
>
> I'm too stupid to use Spec lab!
> I will try the Twente receiver but my internet is so very slow it
> might not work well enough.
>
> 73 de George, DU1GM
>
>
> On Tue, 16 Oct 2012 15:20:29 +0200, you wrote:
>
>    
>> Hi George,
>>
>> There is no chance for you to display normal WSPR from me over that
>> distance in a spectrogram. Maybe you could display WSPR-32 but this is
>> still to optimistic i think. We really have to start in something like
>> QRSS-120 or DFCW-180 and then see what comes out.
>>
>> I have no idea how to set Argo for optimal displaying DFCW-180 since i
>> don't use the new version of the program. Furthermore i am very
>> convinced by using Spectrum Lab for LF/MF detection. Yes, the program is
>> much more complex but it offers some essential features! The band
>> limiting and noise blanking will reduce the QRN very significantly! The
>> improvement can vary from a few to 10 dB, depending on the kind of
>> noise.  I will try to generate a new spectrogram soon, showing this effect.
>> I don't know if Argo allows noise cancelling. But if you loose say 6 dB
>> SNR, that makes a difference from invisible to O copy.
>>
>> Did you try the Twente WEB SDR link i sent you? This is also useful to
>> check if the reference signal you're using is available at present. I'm
>> daily listening to AM BCD stns for many hours a day :-)
>>
>> As said, if you like i can give you some advice how to run a DCF-plot.
>>
>> 73, Stefan/DK7FC
>>
>>
>>      
>