Hackrf one realtime bandwidth11/11/2022 Qspectrum closes abruptly for some reason during scan. What’s the benefit of using SDR devices in a sweep mode instead for this purpose? Maybe a naïve question: I remember having used kismet with standard WiFi hardware to detect hidden WiFi networks. Also, if host software or USB bandwidth is the limiting factor it should be able to implement some kind of averaging in the HackRF firmware. The hackrf_sweep tool itself allows much higher sweep rates. In my view this isn’t a limitation of the hardware, though. I guess this is way too slow to detect brief bursts. Using the software stack I mentioned in this post, I am only able to achieve sweep rates around 0.2 or 0.3s (mainly limited by the capabilities of QSpectrumAnalyzer). If you want to detect very narrow bursts on a WiFi channel you will need a high sweep rate. – The sweep functionality does overcome the 20MHz limitation but it does so at a price. The device has a standard SMA connector, so connecting suitable antennas shouldn’t be a problem. The ANT500 and ANT700 sold by Great Scott Gadgets are only rated up to 1GHz or 1.1GHz respectively. – You would need a suitable antenna for WiFi frequencies. But I can at least name potential issues here: I’m probably unqualified to answer this as I neither have any experience with alternative SDR devices nor with WiFi surveying. The mentioned workarounds are in place since QSpectrumAnalyzer 2.2.0. hackrf_sweep will still run with its native sweep rate but QSpectrumAnalyzer will drop sweeps to reduce the rate accordingly. As a workaround, rate limiting was added by allowing to set a minimum sweep interval.
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