Re: [Discuss-gnuradio] fft realated problems

[Firas A.]

Hi,


1) Are you feeding RF2400 directly from signal generator or by Antenna ?.
Remember that the ISM 2.4GHz band is occupied  by wireless devices.

2) Is your RFX2400 works normally with usrp_fft.py ? Can you see clearly the
signals you generate in it at the specified frequencies ?. Try to Adjust the
RF gain in usrp_fft to get best signal view. Use this gain value in your
experiments.

3) Tune delay is very important. When you command the usrp RF daughterboard
to change its frequency, then there is many delays along the digitization
path (RF synthesizer tuning time, FPGA FIFO filling time, USB transferring
time...etc). Using enough tune delay time, you  will be sure that the
samples entering your FFT block are belong to the requested center
frequency.

4) To clearly see the spectrum, you must use the math log function (as
implemented in usrp_fft.py).


Regards,

Firas 
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