Problems when measuring attenuation with usrp2 + rfx900 with and usrp2_fft.py

GNU Radio
1

How ?

  • Modify the input attenuation value of the spectrum analyzer.

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

I am using the usrp2 + rfx900 with usrp2_fft.py

2

On Thu, Jul 19, 2012 at 12:15 PM, Julio Hector Aguilar Renteria <
[email protected]> 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