Radio Receivers
Show which of the following statements about the amplitude limiter is untrue:

The circuit is always biased in class C, by virtue of the leak-type bias.
The output must be tuned
Leak-type bias must be used
When the input increases past the threshold of the limiting, the gain decreases to keep the output constant.

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

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

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Radio Receivers
In a broadcast superheterodyne receiver, the

RF amplifier normally works at 455 kHz above the carrier frequency
Local oscillator operates below the signal frequency
Local oscillator frequency is normally double the IF
Mixer input must be tuned to the signal frequency

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