On Sat, May 18, 2019 at 12:07 AM Albin Stigö <albin.st...@gmail.com> wrote:
> You need to use a low pass filter (taps) in you resampler. Look at the > spectrum after the resampler and this will be obvious to you. A lowpass > filter with a cutt off at 3-4kHz or so should do it. > This cannot be the problem, because rational_resampler automatically calculates a filter if taps are not specified: https://github.com/gnuradio/gnuradio/blob/4e4f44c726556496c420bceb87ccafe6843916f7/gr-filter/python/filter/rational_resampler.py#L107 (I also checked the GRC file, and the fractional bandwidth is also None (auto-set) despite appearing as "0" in the screenshot.) Unfortunately, I don't have any ideas what the problem *is*. For what it's worth, I have successfully integrated multimon-ng into a flow graph ( https://github.com/kpreid/shinysdr/blob/master/shinysdr/plugins/multimon.py) but the code is very differently structured so it would be hard to transfer the knowledge into GRC. As a next troubleshooting step I would recommend adding GUI sinks at various parts of the flow graph so that you can check the signal integrity. (For an example, consider adding after the float-to-short a short-to-float and QT GUI Sink — to ensure the signal hasn't gotten lost in quantization noise and just needs to be amplified before converting to short, as well as checking that the bandwidth/resampling is good.)
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