Radio Receivers
One of the following cannot be used to demodulate SSB:

Complete phase-shift generator
Bipolar transistor balanced modulator
Product detector
Diode Balance modulator

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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 help the image frequency rejection
To permit easier tracking
To allow adequate frequency coverage without switching

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