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Half a day of looking at a signal that isn't how it should be

Explanations:

Spectrum analyser pictures of a Ettus USRP B200, with signal generation using

uhd_siggen_gui -a master_clock_rate=32768000 -s 20480000

siggen-complex.png f=234.208MHz modulated with 500kHz. Level=0.23, TXGain=50
siggen-twotone1.png f=230MHz modulated with 15kHz and 25kHz. Level=0.1, TXGain=50
siggen-1.png to siggen-3.png f=230MHz unmodulated. Level=0.1, TXGain=50
The last two pictures are erroneous DAB transmissions, caused by a wrong software setting