Hello USRP Users, I’d like to understand the practicality of using a USRP with UBX board as a swept spectrum analyzer to sweep a broad bandwidth, like sampling 10 MHz to 6 GHz fairly quickly. I don’t require extremely precise amplitude calibration across that bandwidth, but the sweep speed (LO tuning and data acquisition initialization) should be relatively quick.
How long does it take to command the USRP to tune to a particular LO center frequency, initiate a data acquisition, and then return the result (excluding the time required to perform the actual sampling)? For example, the Tektronix RSA306B claims a sweep speed of 500 ms for 9 kHz to 6 GHz. Roughly speaking, to cover 6 GHz with ~160 MHz bandwidth, you would need to tune the LO probably 45 to 100 times (depending on overlap, filtering, etc.) . Therefore, if you want to keep the overhead under 200 ms, each tune/initiate acquisition/download step should take no more than 2 or 4 ms. Is it reasonable to tune and acquire with the UBX board in an X300 in 2 to 4 ms? Regards, Jonathan
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