Re: [Discuss-gnuradio] Gnuradio FFT - Graph concatenation

[Hassaan Ahmad]

Thanks for the guidance.

Can I do this message passing in GRC? Also, how would the bandwidths get concatenated together and displayed in the same FFT graph?

On Jun 11, 2015 7:08 PM, "Tom Rondeau" <address@hidden> wrote:

On Thu, Jun 11, 2015 at 9:59 AM, Hassaan Ahmad <address@hidden> wrote:

Hi,

I'm using USRP E310 and running uhd_fft.grc to acquire FFT spectrum from the device in network mode, and then displays that with QT FFT GUI block. 

Setting a center frequency, I can get an instantaneous bandwidth of 32MHz around the center frequency. (for me it's the maximum in network mode) Now, I want to change the center frequency programmatically in order to sweep a larger bandwidth and then concatenate the results into a single QT FFT graph like this: 

-IQ/2-----Cent.freq1-----+IQ/2    -IQ/2-----Cent.freq2------+IQ/2    -IQ/2-----Cent.freq2------+IQ/2  ...

Is their a way I can do it?

Regards,

The QTGUI FFT sink has a message port that allows you to control the center frequency. See the Detailed Description here

http://gnuradio.org/doc/doxygen/classgr_1_1qtgui_1_1freq__sink__c.html

Tom