Radio Receivers
Indicate the false statement. Noting that no carrier is transmitter with J3E, we see that

Production of AGC is a rather complicated process
The transmission is not compatible with A3E
The receiver cannot use a phase comparator for AFC
Adjacent-channel rejection is more difficult

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Radio Receivers
If a FET is used as the first AF amplifier in a transistor receiver, this will have the effect of

Improving the effectiveness of the AGC
Improving the selectivity of the receiver
Reducing the effect of negative-peak clipping
Reducing the effect of noise at low modulation depths

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

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

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