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<p>Hello everyone! I am getting another weird error here. i received my USB e4k tuner and it was working. On OP25 i was using the scopes trying to figure how to get the four lines of dots and with RTL_FM i was getting audio, although the quality was bad. So i shut it down and i went out try on high ground but the signal was still weak. So i shut it down again, put myself within line of sight of the tower, and started it up and now OP25 dies like this:<br>
<br>
Traceback (most recent call last):<br>
File "/home/matt/gr-baz/gr-baz-master/samples/op25_grc.py", line 595, in <module><br>
tb = op25_grc()<br>
File "/home/matt/gr-baz/gr-baz-master/samples/op25_grc.py", line 339, in __init__<br>
self.gr_freq_xlating_fir_filter_xxx_0 = gr.freq_xlating_fir_filter_ccc(decim, (firdes.low_pass(1, samp_rate, xlate_bandwidth/2, 1000)), xlate_offset+xlate_offset_fine-fine_click_freq-auto_tune_offset_freq, samp_rate)<br>
File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/gnuradio_core_general.py", line 6871, in low_pass<br>
return _gnuradio_core_general.firdes_low_pass(*args, **kwargs)<br>
IndexError: gr_firdes check failed: 0 < fa <= sampling_freq / 2<br>
<br>
I have no idea how OP25 (same for RTL_FM) goes from working to failing with this error. Anyone have any ideas about this error?<br>
<br>
Cheers,<br>
Matt<br>
<br>
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