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Hayati Ayguen h_ayguen at web.deHi Nikolay, i don't see any option to do IQ calibration in rtl_fm !? As i wrote to Murat, the DC is NOT the LO ! The spectrum already looks clean. I don't have a problem with the symmetry. The "dc" option does work too late: after demodulation. kind regards, Hayati Am 18.07.2015 um 12:03 schrieb Nikolay Dimitrov: > > You need IQ calibration. > > When calibrated, spectrum should look much cleaner, signals should > appear only on 1 place of the waterfall/spectrum display, and the LO > carrier (the so-called DC) will be much better suppressed, although not > completely removed (that's why the -dc option exists for the baseband > processing). > > Regards, > Nikolay