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