FSK modulator and demodulator in simulink matlab

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lcs81

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The model above obtain from web site.

Question, i just want to try a 'noiseless' channel (without any channel) by modulate and immidaitely demodulate. But why there is error? Shouldn't is zero error?

2. the output of the FSK modulator should be analog signal, right? how come cannot use the scope at FSK modulator's output?


Thanks
 

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