Observation 4109787: Mostly black waterfalls for station 47 - DB0RV

Regarding Observation 4109787

I noticed station 47 - DB0RV has mostly black waterfalls, which I assume indicates a very low background noise level. (Many are darker that this one.) I’m curious has to how he/she does it. If it’s a configuration setting, please post. Or is it the FM filter?


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- Advanced configuration option
- Waterfall setting

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