Radio Receivers
The image frequency of a superheterodyne receiver

Is independent of the frequency to which the receiver is tuned
Is created within the receiver itself
Is due to insufficient adjacent channel rejection
Is not rejected be the IF tuned circuits

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Radio Receivers
In a ratio detector

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

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