[Discuss-gnuradio] Having issues getting APT-DECODER Sample working

[Tommy James Tracy II]

Dear Gnuradio,

        I'm trying to run the following gnuradio program:
http://www.oz9aec.net/index.php/gnu-radio/gnu-radio-blog/440-simple-apt-decoder-prototype

I found a WAV file online to use as the input to the APT-Decoder, so I
fed it in. Unfortunately, the output file resulted in a bunch of '^@'
characters instead of the expected ASCII(0) through ASCII(255).

To make sure that the Audio file source was actually producing an
output, I hooked up an AUDIO_SINK block between the File Source and the
Band Pass Filter. I heard the expected APT sound.

I then proceeded to drop in a WX GUI FFT Sink, and kept getting the
following error:

Has anyone seen this?
-----

Traceback (most recent call last):
  File
"/usr/local/lib/python2.7/dist-packages/gnuradio/wxgui/plotter/plotter_base.py",
line 187, in _on_paint
    for fcn in self._draw_fcns: fcn[1]()
  File
"/usr/local/lib/python2.7/dist-packages/gnuradio/wxgui/plotter/plotter_base.py",
line 59, in draw
    self._draw()
  File
"/usr/local/lib/python2.7/dist-packages/gnuradio/wxgui/plotter/grid_plotter_base.py",
line 407, in _draw_point_label
    label_str = self._populate_point_label(x_val, y_val)
  File
"/usr/local/lib/python2.7/dist-packages/gnuradio/wxgui/plotter/channel_plotter.py",
line 151, in _populate_point_label
    label_str += '\n%s: %s'%(channel, common.eng_format(y_value,
self.y_units))
  File
"/usr/local/lib/python2.7/dist-packages/gnuradio/wxgui/plotter/common.py",
line 82, in eng_format
    coeff, exp, prefix = get_si_components(num)
  File
"/usr/local/lib/python2.7/dist-packages/gnuradio/wxgui/plotter/common.py",
line 48, in get_si_components
    exp = get_exp(num)
  File
"/usr/local/lib/python2.7/dist-packages/gnuradio/wxgui/plotter/common.py",
line 37, in get_exp
    return int(math.floor(math.log10(abs(num))))
ValueError: cannot convert float NaN to integer

-----

I think this means that the WAV file (float output) is producing NAN
outputs. Is there any way that I can remove those? Anyone have any
success doing this before?

Thanks in advance!
-- 
  Tommy J. Tracy II
 Computer Engineering
University of Virginia

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