Discussion
Carrier suppression in a balanced modulator is limited chiefly by
Answer: D
Any mismatch in the diodes or transistors, or in the transformer windings, leaves a carrier residue, so carrier suppression is a matter of balance and is usually trimmed with a potentiometer. Message amplitude affects the sideband level rather than the residue. Frequency matters through stray reactances but is not the chief limit. And the following filter can help only if the carrier falls outside its passband, which in a double-sideband output it does not.
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