Radio Receivers
In a ratio detector

the output is twice that obtainable from a similar phase discriminator
the linearity is worse than in 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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Radio Receivers
The local oscillator of a broadcast receiver is tuned to a frequency higher than the incoming frequency

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

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