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

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

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

Leak-type bias must be used
The circuit is always biased in class C, by virtue of the leak-type bias.
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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