23. What condition may prevent a VHF radio receiver from receiving a weak signal?

The local oscillator frequency is beating against the incoming signal to produce an Intermediate Frequency (IF).
The output signal of the Phase Locked Loop (PLL) circuit in the frequency synthesizer has become unlocked.
The output signal of an AF amplifier stage is greater than the input signal.
The weak RF signal has been suppressed at the limiter stage of the received by capture effect .

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