This [MetOP-A BPSK observation](https://network.satnogs.org/observations/347570/) failed with the following error: > Traceback (most recent call last): > File "/usr/local/bin/satnogs_bpsk_ax25.py", line 434, in <module> > main() > File "/usr/local/bin/satnogs_bpsk_ax25.py", line 428, in main > tb = top_block_cls(antenna=options.antenna, baudrate=options.baudrate, bb_gain=options.bb_gain, decoded_data_file_path=options.decoded_data_file_path, dev_args=options.dev_args, doppler_correction_per_sec=options.doppler_correction_per_sec, enable_iq_dump=options.enable_iq_dump, file_path=options.file_path, if_gain=options.if_gain, iq_file_path=options.iq_file_path, lo_offset=options.lo_offset, ppm=options.ppm, rf_gain=options.rf_gain, rigctl_port=options.rigctl_port, rx_freq=options.rx_freq, rx_sdr_device=options.rx_sdr_device, samp_rate_rx=options.samp_rate_rx, udp_IP=options.udp_IP, udp_port=options.udp_port, waterfall_file_path=options.waterfall_file_path, excess_bw=options.excess_bw, max_cfo=options.max_cfo) > File "/usr/local/bin/satnogs_bpsk_ax25.py", line 109, in __init__ > 1, sps*baudrate, ((1.0 + excess_bw) * baudrate/2.0) + max_cfo, baudrate / 16.0, firdes.WIN_HAMMING, 6.76)) > File "/usr/lib/python2.7/dist-packages/gnuradio/filter/filter_swig.py", line 143, in low_pass > return _filter_swig.firdes_low_pass(*args, **kwargs) > RuntimeError: firdes check failed: 0 < fa <= sampling_freq / 2