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Problem with continuous sine wave in raised cosine filter

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hk

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Raised cosine filter

hi,anyone knows why i couldnt get a continuous sine wave like this:
71_1157706676.GIF


after i input Manchester coded random data into raised cosine filter but ends up getting square waves in time domain? I am using digital raised cosine filter with filter order=2 and fs = 3MHz,fc=1MHz,FIR/normal.
Thanks for any advices.
 

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