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<p class="MsoNormal"><span lang="EN-US">Hi, all<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> I try to re-structure the osmo-tetra to work with GNU Radio 3.7. The osmo-tetra is based on GNU Radio 3.6.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> The original code has tuner, resampler, demodulater three modules which connected sequentially.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> The resampler is based on function pfb_decimator_ccf which changes from 3.6 to 3.7. The pfb_decimator_ccf only take single parameter decimation, which changes in 3.7,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> After reading the manual of 3.7, I made following changes to the python script :
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:21.0pt"><span lang="EN-US"> Add a low-pass filter “ taps = filter.firdes.low_pass_2(1, fs, options.low_pass, options.low_pass * 0.2, attenuation_dB=ATT, window=filter.firdes.WIN_BLACKMAN_hARRIS) “<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:21.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:21.0pt;text-indent:21.0pt"><span lang="EN-US">Change “self.resamp = blks2.pfb_decimator_ccf(int(rerate)) “ to “ self.resamp = filter.pfb_decimator.ccf(int(rerate), taps, 0) “<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:21.0pt;text-indent:21.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:21.0pt"><span lang="EN-US">But error still occurs when connecting modules “ self.connect(self.src, self.tuner, self.resamp, self.demod, self.output) “ :<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:21.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:21.0pt"><span lang="EN-US">Traceback (most recent call last):<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:21.0pt"><span lang="EN-US"> File "./osmosdr-tetra_demod_fft.py", line 264, in <module><o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:21.0pt"><span lang="EN-US"> tb.Run(True)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:21.0pt"><span lang="EN-US"> File "/usr/local/lib/python2.7/dist-packages/grc_gnuradio/wxgui/top_block_gui.py", line 82, in Run<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:21.0pt"><span lang="EN-US"> self.Start(start, max_nouts)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:21.0pt"><span lang="EN-US"> File "/usr/local/lib/python2.7/dist-packages/grc_gnuradio/wxgui/top_block_gui.py", line 73, in Start<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:21.0pt"><span lang="EN-US"> self.start()<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:21.0pt"><span lang="EN-US"> File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/top_block.py", line 103, in start<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:21.0pt"><span lang="EN-US"> top_block_start_unlocked(self._tb, max_noutput_items)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:21.0pt"><span lang="EN-US"> File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/runtime_swig.py", line 4612, in top_block_start_unlocked<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:21.0pt"><span lang="EN-US"> return _runtime_swig.top_block_start_unlocked(*args, **kwargs)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:21.0pt"><span lang="EN-US">RuntimeError: pfb_decimator_ccf(13): insufficient connected input ports (5 needed, 1 connected)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> Does it indicate pfb_decimator_ccf take 5 inputs ? It puzzled me.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Best Regards, Jiang Pin</span><span lang="EN-US"><o:p></o:p></span></p>
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