This is my HackRF One tuned to the FM broadcast band with a mediocre antenna, displayed using my ShinySDR software. One of the characteristic features of a receiver using an analog baseband I/Q signal is the “DC offset” or “DC spike”, a spurious signal visible at exactly the center frequency of the received samples. The HackRF One does not use bandpass sampling, as I think you might be asking. When transmitting, all of these stages operate in reverse the MAX5864 works as a DAC instead of an ADC, and the same LOs and mixers are used. The baseband IQ signal from the MAX2837 is then sent to the MAX5864 ADC for conversion to digital samples, which are then sent to the host computer.
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