On 05/05/2019 15:10, Alessandro Gorobey via wsjt-devel wrote:
I found a new parameter of the configuration file never mentioned before
A little comment ???
Hi Sandro,
"Most sensitive" is as previous versions. "Low sidelobes" is new and the
default. Low sidelobes applies a window function to the sample data
before the FFT that generates the waterfall image lines. The window
function removes some artefacts of the discrete FFT algorithm, and
results in a truer representation of the input sample stream, at the
expense of a small loss in sensitivity. It was deemed necessary now we
are using GFSK modulation so that the cleaner received signals can be
well represented on the waterfall.
One good way to see the difference is to tune to an unmodulated carrier
and switch between the two options. You should see that the filtered
version is more representative. Also playing back a saved .WAV file
using the two options will demonstrate the differences. The setting has
no impact on decoding, it only affects the waterfall and 2D spectrum
displays.
73
Bill
G4WJS.
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