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Lucas Teske lucas at teske.net.brThat doesn't look an IQ Imbalance but a DC Offset. But that depends a lot of the tuner you use. I develop some softwares using rtlsdr, and the newest dongles with R820T2 dongle doesn't have IQ Imbalance or DC Spike issues by default. Em 27/02/2017 10:30, a c escreveu: > 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