Hi George, On 21/02/2022 18.31, George Edwards wrote: > lpfilter = gr::filter::firdes::low_pass(gain, sampling_freq, cutoff_freq, > transition_bandwidth, > fft::window::win_type > <https://www.gnuradio.org/doc/doxygen/classgr_1_1fft_1_1window.html#a599d7e9625d6cc77203a8b877c4911e2>window > = fft::window::win_type::WIN_HAMMING, beta = 6.76); > > This failed and showed a squidly across the line with > fft::window::win_type....!
Try adding "gr::" before "fft::window" and make sure gnuradio/fft/window.h is included. #include <gnuradio/fft/window.h> lpfilter = gr::filter::firdes::low_pass(gain, sampling_freq, cutoff_freq, transition_bandwidth, gr::fft::window::win_type window = fft::window::win_type::WIN_HAMMING, beta = 6.76); If this does not fix it then provide the exact error you are getting. Regards, Vasil