[Discuss-gnuradio] gr_firdes_bandpass()

[Marcus D. Leech]

I don't understand why this is failing:

Traceback (most recent call last):
  File "./top_block.py", line 184, in <module>
    tb = top_block(options)
  File "./top_block.py", line 97, in __init__
    1, bw, -7.0, 7.0, 150, firdes.WIN_HAMMING, 6.76))
  File
"/usr/local/lib/python2.5/site-packages/gnuradio/gr/gnuradio_swig_py_general.py",
line 2729, in band_pass
    return _gnuradio_swig_py_general.firdes_band_pass(*args, **kwargs)
IndexError: gr_firdes check failed: 0 < fa <= sampling_freq / 2


When I specify negative frequencies, it does this.

I thought that with a complex filter, I could specify negative frequency?

This particular filter is a decimating filter that is decminating from
500KHz sample rate down to 32KHz sample rate,
  with cutoff between -7KHz and +7KHz.   But I'm triggering this error,
and I don't understand why.  This is from
  a GRC flow-graph.

-- 
Marcus Leech
Principal Investigator, Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org