FUNcube Dongle und SpectraVue
DC-Offset und Spiegelfrequenzunterdrückung
SpectraVue setup: ... in the "Soundcard IN Setup" set the centre frequency to 48000 that will allow you the use of the full sweep but remember the selected Dongle frequency remains at the centre of the screen. For best results you need to adjust the "I/Q Comp" figures to suit your unit. Adjust "I dc" & "Q dc" for lowest DC offset (hump at centre of screen) and "alpha" and "beta" for the lowest signal image however without a stable signal source of variable level the latter adjustment can be a bit trial and error.