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

Diode Balance modulator
Complete phase-shift generator
Product detector
Bipolar transistor balanced 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 permit easier tracking
To help the image frequency rejection
To allow adequate frequency coverage without switching

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Radio Receivers
In a radio receiver with simple AGC

The audio stage gain is normally controlled by the AGC
The highest AGC voltage is produced
An increase in signal strength produces more AGC
The faster the AGC time constant the more accurate the output

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