It has been a while since I have worked with GNUradio, but I am poking around
with it again and having some issues. I am currently using v3.8 on an Ubuntu
machine.
I was trying to get a custom flowgraph to work and ran up against an error for
the rational resampler. I then pulled out the fm_rds_alternate.grc example
from gr-rds and found the exact same issue. Basically, if I use the stock
flowgraph, when I try to run it, I get the following error:
Traceback (most recent call last):
File "/opt/gnuradio/v3.8/src/gr-rds/examples/fm_rds_alternate.py", line 784,
in <module>
main()
File "/opt/gnuradio/v3.8/src/gr-rds/examples/fm_rds_alternate.py", line 760,
in main
tb = top_block_cls()
File "/opt/gnuradio/v3.8/src/gr-rds/examples/fm_rds_alternate.py", line 548,
in __init__
fractional_bw=0)
File
"/opt/gnuradio/v3.8/lib/python3/dist-packages/gnuradio/filter/rational_resampler.py",
line 150, in __init__
interpolation, decimation, taps, fractional_bw)
File
"/opt/gnuradio/v3.8/lib/python3/dist-packages/gnuradio/filter/rational_resampler.py",
line 113, in __init__
taps = design_filter(interpolation, decimation, fractional_bw)
File
"/opt/gnuradio/v3.8/lib/python3/dist-packages/gnuradio/filter/rational_resampler.py",
line 46, in design_filter
raise ValueError("Invalid fractional_bandwidth, must be in (0, 0.5)")
ValueError: Invalid fractional_bandwidth, must be in (0, 0.5)
>>> Done (return code 1)
Did something maybe change with the rational resampler and I need to update
older flowgraphs? Using a value of 0.4 allows it to run, but I am not sure if
that is an acceptable value when it was previously set to zero (it would
appear).
