Hi.
T'day I'm trying waterfall.py by keenderd the first time. You can download the script from here: https://github.com/keenerd/rtlsdr-waterfall.
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If you start the script with
python waterfall.py 935000000 960000000 for example you'll get a result like the one in the picture above. It's showing the GSM 900 band with hopping and non-hopping signals.