Hi,
I have implemented a scanner software on Linux that directly uses the hardware
API's for the hackRF, airspy, bladeRF, etc. It is similar to
osmocom_spectrum_sense but does not use the gr-osmosdr interface as that
program does. The scanner outputs panoramic spectrum by receiving a few packets
at a frequency, retuning, and repeating. For the hackRF the scanner showed many
spurious signals with the initial setting where I discarded one packet of
131072 samples after each retune. At 20Msps this corresponds to a retune delay
of around 6ms. I found from some online sources that the device needs a USB
retune time of 2ms. I finally got a reasonable looking spectrum by increasing
the return delay to 200ms.
Why do I need such a large delay ? Is there any way to reduce host based retune
time ?
Thanks for any help,
--Patrick
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