[USRP-users] interpretation of received signal

Marcus D. Leech mleech at ripnet.com
Thu Oct 19 23:19:10 EDT 2017

On 10/18/2017 01:47 PM, Nirmala Soundararajan via USRP-users wrote:
> Yeah got it!  But don't you think the tool has those capabilities to 
> consider the entire chain and then display the output?  Since I don't 
> have actual spectrum analyzer in the lab I am forced to use the 
> software spectrum analyzer.
Unless said software "understands" the hardware, and has calibration 
tables, then, no, it cannot possibly display dBm, or any other 
   units with any degree of confidence above "wild guess".

I'm pretty sure MatLab doesn't have calibration tables for USRPs, and if 
it did, it would need such tables *for each and every device*.  Which is 
   *possible*, but it requires a *process* to set-up those tables, and 
one of the crucial devices in any such setup is a calibrated signal source.
   You cannot use an uncalibrated source (TX port of the USRP) to 
calibrate an uncalibrated receiver (RX port of the USRP).

More information about the USRP-users mailing list