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 linearity is worse than in phase discriminator
the output is twice that obtainable from a similar phase discriminator

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