$ gnuradio-companion
An untitled GRC window should open.
1. Double click on the options block. Type project title and Author Name. Set General options to WX GUI. Click OK.
2. On the right side of the window by expanding the wave generator category click on signal source. Place signal source.
3. Click on Misc->Throttle and place in the flow graph also place scope sink connect the blocks. The data type must be float.
4. Press F5 to generate and F6 to execute the flow graph you will see simple cosine wave with frequency 1Khz.
5. Now change the data type of all the three blocks to complex and then press F5 and F6 to generate and execute flow graph. You will see two wave that are 90' out of phase from each other.
The leading (ch1) wave is the In-phase component of the
complex signal and the lagging (ch 2) wave is the quadrature component. When a signal source is set to Complex, it will output both the I and Q components
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