Varying the bandwidth of a signal in GRC

GNU Radio
1

Hi ,
Can anyone kindly tell that how i can vary the bandwidth of my
transmitted signal in GRC??I am using B210 which has a instantaneous
bandwidth of 56MHz…

2

Hi Ali,

the Nyquist bandwidth of a complex signal is equal to its sample rate.
You can set the sample rate of your usrp_sink during flowgraph
construction in the properties dialog,
using stream tags, using asynchronous messages or simple method calls:
http://gnuradio.org/doc/doxygen/page_uhd.html

Greetings,
Marcus

3

Thnx Marcus…u mean that if i change the sample rate of USRP sink
block in the properties dialog box then the bandwidth will be equal to
the changed sample rate??

4

Hi Jason,

Please go through this,

http://gnuradio.org/redmine/projects/gnuradio/wiki/TutorialsCoreConcepts#Sampling-rates

Try

  1. Varying USRP sample rate and observe the output using FFT sink
  2. In the flowgraph use an interpolator (rational resampler) just before
    your USRP sink, vary the interpolation factor and check the output.

Things will be more clear then.

Thanks
Sreeraj

5

yes.