On 31 January 2017 at 17:17, Marc Pàmies Massip <[email protected]> wrote: > > I am using a HackRF with my laptop (HP Spectre from 2016), but I am not sure if its USB ports are good enough for this device. You can find attached the output of "hackrf_transfer -r NUL -s 8000000", and as you can see the values from the first column are not always the same as in the second column. I was using the minimum sample rate recommended for the HackRF (8 MHz), so does it mean that I should use another computer to obtain reliable results? Is there a way to fix this without changing the computer or I should just work with sample rates under the minimum recommended?
This output looks good to me, at 8MHz we expect a pair of bytes 8 million times per second, which matches the data rate you are seeing - 16MB/s. Could you try the same with "hackrf_transfer -r /dev/null -s 20000000" to see what the maximum throughput you can achieve is? I would expect you to get an average of 40MB/s with that. You can even try pushing it higher than 20MHz, but you will approach the limit of the USB 2.0 connection very quickly and the throughput will drop. > PD: I don't know if it has anything to do with this, but according to the output of "hackrf_info" my firmware version is 2014.08.1. Should I upgrade it or it's not necessary? Yes, it is always recommended to run the latest release host code and firmware. The current version is 2015.07.2. Thanks, Dominic
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