[hughrr]

The noise floor of the measurement receiver is terrible though so you really don’t know what the true performance is here.

[fsh]

I don't see a resolution bandwidth in the plot. How do you judge the noise floor without that?

[hughrr]

RBW is fixed at 1.75MHz on the HackRF. But it's the measurement setup as a whole (that is the measurement receiver). The noise floor of this measurement is represented by the visible noise floor at -70dBm. That's a combination of a number of factors. Plus the HackRF has poor dynamic range and only 8 bits sampling which is quite terrible.