Simulate physical FM Transmitter circuit on Matlab Simulink
The issue here is physical domains.

The black traces are the traditional simulink s-domain traces

The brown signals are physical but domain agnostic trace

The Blue signals are the electrical domain traces.

You have found the Simulink to Physical port converter to map a simulink signal into the Simscape domain, now you need a source for this signal to control. A voltage source should be all you need 



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