Hello, I use RTL-FM on a raspberry pi3. I notice practically always the presence of a weak carrier accompanying the emission received in AM mode and interferences in NFM mode. When i use rtl-tcp and sdr# or sdrconsole the demodulation is perfect. I assume that IQ amplitude phase correction is involved. I saw in the source of rtlsdr: IQ estimation / compensation (en_iq_comp, en_iq_est) * / Rtlsdr_demod_write_reg (dev, 1, 0xb1, 0x1b, 1); I suppose we use an internal chipset function? Is this function good enough? I did not find anything about it in RTL-FM but I'm not a specialist. Is an improvement possible? Regards, Arnaud