Radio Receivers
When a receiver has good blocking performance, this means that

Its image frequency rejection is poor
Its detector suffers from burnout
It does not suffer from double-spotting
It is unaffected by AGC derived from nearby transmissions

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

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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.
Leak-type bias must be used
When the input increases past the threshold of the limiting, the gain decreases to keep the output constant.
The output must be tuned

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

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.
Variable sensitivity is used to eliminate selective fading

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