![]() You should have approximately a 14db gain. Measure signals you receive, set the RF gain to 14 and measure them again. Configure the IF and BB gain to something in the middle of the scale (around 16 and 26dB respectively) and set the RF gain to 0. ![]() You just have to launch the osmocom_fft program (you can find it in the gr-osmosdr package of Pybombs) and sintonize a frequency where you can see transmissions (eg: the FM band). Is very easy to find if the LNA – the amplifier for the RX signal – is broken. When working the with HackRF in GNU Radio, the RF parameter enables the amplifiers (RF=14) or disables/bypass them (RF=0) Two RF switches Skyworks Sky13317 – U12 and U14 in the schematic – connect the antenna to the LNA, the PA or they just bypass the amplifiers.
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