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

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

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Radio Receivers
In a radio receiver with simple AGC

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

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Radio Receivers
In a ratio detector

the circuit is the same as in a discriminator, except that the diodes are reversed
stabilization against signal strength variations is provided
the output is twice that obtainable from a similar phase discriminator
the linearity is worse than in phase discriminator

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Radio Receivers
Indicate the false statement in connection with communications receivers.

Variable sensitivity is used to eliminate selective fading
The noise limiter cuts off the receiver’s output during a noise pulse.
Double conversion is used to improve image rejection
A product demodulator could be used for the reception of Morse code.

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