 So please open a monitor for WAVOUT (U_35) after RMZLPF.
The Base Band has come back after the LPF. The demodulation has succeeded!!
By the way, please double-click on DELAY (U_36). Then you will see a dialog,
so please click "Change Parameters" and change the DELAY Parameter
from "4" to "0".
After you save the schematic, please open a monitor for WAVOUT (U_9). The signal is supposed
to be like this.
In this case, LPF removes almost everything and you see no Base Band. (open
the monitor of U_35).
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