Radio Receivers
Indicate the false statement. Noting that no carrier is transmitter with J3E, we see that

Adjacent-channel rejection is more difficult
The receiver cannot use a phase comparator for AFC
Production of AGC is a rather complicated process
The transmission is not compatible with A3E

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Radio Receivers
The local oscillator of a broadcast receiver is tuned to a frequency higher than the incoming frequency

Because otherwise an intermediate frequency could not be produced
To permit easier tracking
To help the image frequency rejection
To allow adequate frequency coverage without switching

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Radio Receivers
In a ratio detector

stabilization against signal strength variations is provided
the circuit is the same as in a discriminator, except that the diodes are reversed
the output is twice that obtainable from a similar phase discriminator
the linearity is worse than in phase discriminator

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