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

[Marcus Müller]

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
>