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Re: [Discuss-gnuradio] fft realated problems
From: |
kaleem ahmad |
Subject: |
Re: [Discuss-gnuradio] fft realated problems |
Date: |
Tue, 4 Nov 2008 07:59:09 -0800 (PST) |
Dear Firas,
Thanks for your reply, First of all I am using antenna (RX2), and yes I know
2.4 band is messed up with many wireless tech. but I am continuesly
monitoring it with spectrum analyzer during my experiments to make sure that
some other system is not working in the area.
I have tried with many TX and RF gains.
I am also using log function, and I have already checked with larger
tune_delays but all in vain????????
Any suggestions??
Best Regards
Kaleem Ahmad
Firas A. wrote:
>
> 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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- [Discuss-gnuradio] fft realated problems, kaleem ahmad, 2008/11/03
- Re: [Discuss-gnuradio] fft realated problems, Firas A., 2008/11/04
- Re: [Discuss-gnuradio] fft realated problems, kaleem ahmad, 2008/11/04
- Re: [Discuss-gnuradio] fft realated problems, Firas A., 2008/11/04
- Re: [Discuss-gnuradio] fft realated problems,
kaleem ahmad <=
- Re: [Discuss-gnuradio] fft realated problems, Eric Blossom, 2008/11/04
- Re: [Discuss-gnuradio] fft realated problems, kaleem ahmad, 2008/11/04
- Re: [Discuss-gnuradio] fft realated problems, Firas Abbas, 2008/11/04
- Re: [Discuss-gnuradio] fft realated problems, kaleem ahmad, 2008/11/04
- Re: [Discuss-gnuradio] fft realated problems, Firas A., 2008/11/04
[Discuss-gnuradio] Use of bin_statistics, Paul Mathews, 2008/11/07