Error meaning: not connected internally

GNU Radio
1

Dear all,

I try to make simulation for qam loopback. But there is an error:
RuntimeError: hierarchical block ‘qam8_demod’ input 0 is not connected
internally

What is the error mean?

Thank you for your help
Makmur

File “/home/makmur/sim_qam_loopback.py”, line 150, in
tb.Run(True)
File
“/usr/lib/python2.6/dist-packages/grc_gnuradio/wxgui/top_block_gui.py”,
line
73, in Run
if start: self.start()
File “/usr/lib/python2.6/dist-packages/gnuradio/gr/top_block.py”, line
97,
in start
self._tb.start()
File
“/usr/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_swig_py_runtime.py”,
line 1411, in start
return _gnuradio_swig_py_runtime.gr_top_block_sptr_start(*args,
**kwargs)
RuntimeError: hierarchical block ‘qam8_demod’ input 0 is not connected
internally

2

On Wed, Apr 7, 2010 at 1:18 AM, Makmur H. [email protected]
wrote:

Dear all,

I try to make simulation for qam loopback. But there is an error:
RuntimeError: hierarchical block ‘qam8_demod’ input 0 is not connected
internally

What is the error mean?

Thank you for your help
Makmur

The QAM receiver code isn’t really ready for use yet. In fact, if you
look into the code of the block, there’s nothing there and it has been
disabled for use with the modulation_utils.

We don’t really have the synchronization capabilities written for QAM
signals yet, although some of the newer code I’ve been working on
should be almost there.

Please feel free to work on this. I’d love to see it in the code, but
I won’t have the time to get to it for a while yet.

Tom