Is there a way to produce an efficient notch filter with the bandpass
filter designer in Gnu Radio?
I’m seeing narrowband interfering signals that are in-band (with respect
to the bulk filtering in front
of the receiver), and I want to notch one or more of them into
oblivion. I’d previously used an
FFT filter, and set zeros in the bins where I wanted notches, but it
wasn’t very efficient.