Radio Receivers
An AM receiver uses a diode detector for demodulation. This enables it satisfactorily to receive

Single-sideband, reduced-carrier
ISB
Single-sideband, full-carrier
Single-sideband, suppressed-carrier

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Radio Receivers
In a ratio detector

the output is twice that obtainable from a similar phase discriminator
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

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

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

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