From: "Clemens Paul" <cpaul@gmx.net>
To: <rsgb_lf_group@blacksheep.org>
References: <095C9D4E586E45CAA3FE071EA4EA9818@HPG5401fr> <53E0F872.3030500@gmail.com> <64A3B1F0647248229C5C374887AA2FCB@F6CNI> <53E1EC0B.2060309@gmail.com> <1686C40AF97B4ABE99024972373C232A@HPG5401fr> <96662FC1BCA8402098A702D935EEC66F@F6CNI>
In-Reply-To: <96662FC1BCA8402098A702D935EEC66F@F6CNI>
Date: Fri, 8 Aug 2014 18:03:44 +0200
Message-ID: <9556CA31D58145AFA57960399F67FE98@Clemens0811>
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Subject: LF: RE: Re: Testing now a new RX antenna on MF
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Hello André, 

>so I need to use a 100 Hz filter to kill it, or I 
>copy nothing....  
>Of course, using such a sharp DSP filter 
>here, means that the S/N reports ts not realist here.

I believe S/N reports are realistic in any BW
if you are telling the BW at which the SNR has been measured.
Unfortunately in many S/N reports the associated BW is missing.
and therefore they are quite meaningless.
Just look at the reception report list of SAQ transmissions...
Another problem is that quite a few SDR users mix up the
SNR seen on the FFT spectrum with the SNR referred to the receiving "IF"-BW
in which the signal is demodulated.
E.g., if your FFT is set to a bin width of say 5Hz and a carrier lies 20dB over
the DANL (displayed average noise level) it will have a SNR of zero dB in a
500Hz "IF"-bandwidth and therefore will be barely audible.

73
Clemens
DL4RAJ 


>-----Original Message-----
>From: owner-rsgb_lf_group@blacksheep.org 
>[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of André Guyé
>Sent: Friday, August 08, 2014 10:56 AM
>To: rsgb_lf_group@blacksheep.org
>Subject: LF: Re: Testing now a new RX antenna on MF
>
>Hello Stefan,
> 
>I’ll try many other tests to day and saturday at day time, including :
>
>*	a 45° change in the K9AY direction of the 4 support wires ; 
>*	an extra relay system to use only one of the two out of 
>phase verticals. That means it can works also as a single 
>vertical monopole.
>
>Note : I have still the terrific local QRM carrier running on 
>475725 kHz, so I need to use a 100 Hz filter to kill it, or I 
>copy nothing.... Of course, using such a sharp DSP filter 
>here, means that the S/N reports ts not realist here. But, the 
>relative values are the most important in this test, even you 
>know that the WSPR S/N is not linear for positives values.
> 
>73, F6CNI.
> 
>From: Guyé André <mailto:andre.guye1@aliceadsl.fr>  
>Sent: Wednesday, August 6, 2014 11:48 AM
>To: rsgb_lf_group@blacksheep.org 
>Subject: LF: Re: Testing now a new RX antenna on MF
> 
>Hello Stefan.
> 
>I just start my RX now, hunting at your signal.
> 
>I’ll test the both antennas K9AY (in the 4 possible 
>directions) and the 2 els out of phase verticals, to see the 
>diferences. On day time your signal is stable + / – 1 dB.
> 
>So, more info in the evening.
> 
>73 F6CNI
> 
>
>
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