Hello, using a FUNcube dongle, the first_decim rate is to high. regards Stefan My patch --- a/src/demod/python/osmosdr-tetra_demod_fft.py +++ b/src/demod/python/osmosdr-tetra_demod_fft.py @@ -61,8 +61,11 @@ class top_block(grc_wxgui.top_block_gui): out_sample_rate = symbol_rate * sps options.low_pass = options.low_pass / 2.0 - - first_decim = 10 + + if sample_rate == 96000: + first_decim = 2 + else: + first_decim = 10 self.offset = 0