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Comparison ADI IIO Oscilloscope and cyclic-sine gnuradio

Question asked by mr_nazrin on Aug 1, 2017
Latest reply on Aug 1, 2017 by mr_nazrin

Dear support community,

 

I make comparison waveform response using ADI IIO Oscilloscope and gnuradio-examples using cyclic-sine.grc. My hardware is Zedboard + FMCOMMS2 + latest image 2016_R2-2017_06_29.img.xz. On IIO Osciloscope, the parameters set to AD9361 Receive Chain and Transmit Chain are : 

RF bandwidth =20MHz

Sampling Rate=61.44MSPS

LO=2.4GHz

 

DDS, frequency =1Mhz, scale =-12db, phase 90

 

Then I verify on Time domain, Frequency domain and Constellation are good shape condition. (Waveform IIO.png) . Then I close IIO Oscilloscope to open cyclic-sine and configure same parameters ( gnuradio flow graph.png) like IIO Oscilloscope and run the gnuradio.

 

However the response on QT Sink- time,frequency and constellation are not similar and worst shape (time sink.png and const sink.png).

There is anything wrong on my setup/configuration on gnuradio  flow graph ?

 

Thank you

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