Discussion
A squaring loop suffers from which limitation?
Answer: C
Squaring destroys the sign, so the recovered carrier carries a half-cycle ambiguity and the recovered message may come out inverted; for analogue speech that hardly matters, but for data it must be resolved by a known reference or by differential coding. It tracks drift perfectly well once locked. It needs no pilot, which is its attraction. And it is a suppressed-carrier technique applicable to DSB rather than restricted to SSB.
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