Re: [Discuss-gnuradio] Problems when measuring attenuation with usrp2 + rfx900 with and usrp2_fft.py

On Thu, Jul 19, 2012 at 12:15 PM, Julio Hector Aguilar Renteria <jhaguilar@gmail.com> wrote:

How ?

• Modify the input attenuation value of the spectrum analyzer.

The "gain" parameter will allow you to change this. Please ensure the input signal is below -20dBm to avoid damage to the receiver. 

• Know the relationship between the attenuation and the noise power spectrum analyzer.

The USRP does not have absolute gain calibration; as a result, if you require absolute power measurements, you will have to calibrate it with a known source.

--n 

I am using the usrp2 + rfx900 with usrp2_fft.py
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