Re: AttributeError: module 'gnuradio.digital.qam' has no attribute 'qam_mod'

Hi Lannan Jiang,

that block was deprecated for a long time and later removed. It doesn't
exist in GNU Radio 3.8. You can, however, probably replace it relatively
straight forward with a QAM constellation mapper and a pulse shaper.

Best regards,
Marcus

On 17.06.20 19:40, lannan jiang wrote:
> Hi everyone,
>
> I am still pretty new to GNU Radio, and I am trying to use the 'QAM-mod' block in GRC. However, I have encountered the following error and I am not sure how to fix this:
>
> error message:
>
> Traceback (most recent call last):
> File "/home/lannanjiang/gr-iio/My_Radio/QAMmodem.py", line 214, in <module>
> main()
> File "/home/lannanjiang/gr-iio/My_Radio/QAMmodem.py", line 192, in main
> tb = top_block_cls()
> File "/home/lannanjiang/gr-iio/My_Radio/QAMmodem.py", line 140, in __init__
> self.digital_qam_mod_2 = digital.qam.qam_mod(
> AttributeError: module 'gnuradio.digital.qam' has no attribute 'qam_mod'
>
>
> The following is what I typed to install gnuradio and gr-iio on a 64bit guest machine, Ubuntu 20.04 LTS.
>
> sudo apt install gnuradio
> sudo apt install swig
> sudo apt install liborc-dev
> git clone -b upgrade-3.8 https://github.com/analogdevicesinc/gr-iio.git
> cd gr-iio
> cmake .
> make
> sudo make install
> cd ..
> sudo ldconfig
>
>
> I have looked up similar questions asked by others but I was unable to resolve this error.
> By the way, I was able tp use FM mod and demod blocks GNU radio, but I keep getting the "no attribute error" for QAM mod and constellation modulator blocks.
>
> Please help me with this, any suggestions will be appreciated!
>
> Thanks in advance
> Lannan Jiang
>