Spectrum and spectrogram of ATSC 3.0 signal. The portion of the signal seen to the right of the 3.0 signal is a ATSC 1.0 transmission. The pilot tone for that transmission is the spectral line on the right.
This flowgraph demodulates a FM broadcast station. It demonstrates using the "Complex to Arg" block. The blocks from the output of the lowpass filter to the output of the "Multiply Const" block are equivalent to the "Quadrature Demod" block.