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Al's picture

Hello Antoine,

The 250kHz lines could be something to do with the way the software attempts to flatten the frequency response. If you click on 'Edit -> Radio devices' the 'Band offset' defaults to 250kHz. You can click this number to change it which may help.

It also might be due to a high input signal overloading either the upconverter or the dongle, either way I'd be interested to hear back if you have any luck with it.