Radio Receivers
The controlled oscillator synthesizer is sometimes preferred over the direct one because

It is a simpler piece of equipment
Its frequency stability is better
It does not require crystal oscillator
It is relatively free of spurious frequency

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

When the input increases past the threshold of the limiting, the gain decreases to keep the output constant.
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

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Radio Receivers
In a broadcast superheterodyne receiver, the

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

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