Re: [Discuss-gnuradio] USRP / DBSRX calibration

[Firas A.]

Hi,

During my tests with DBSRX board, I noticed that using the same Local
Oscillator offset tick (by 4MHz) used with the RFX boards in the dbsrx
board, enhanced the dbsrx SFDR by about 14 dB as shown in the following
figures :

http://rapidshare.com/files/79323579/dbsrx.tar.gz

I used 1000.25 MHz sine wave to do the tests. To simulate the dbsrx LO
offset I cheated the usrp_fft.py   set_freq()  function as follows :

r = self.u.tune(0, self.subdev, target_freq+4000000)
self.u.set_rx_freq(0,4000000)


Firas A.

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