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Radio Receivers
A superheterodyne receiver with an IF of 450 kHz is tuned to a signal at 1200 kHz. The image frequency is
750 kHz
1650 kHz
900 kHz
2100 kHz
750 kHz
1650 kHz
900 kHz
2100 kHz
Answer
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Related Question
Radio Receivers
In a ratio detector
the circuit is the same as in a discriminator, except that the diodes are reversed
the linearity is worse than in phase discriminator
the output is twice that obtainable from a similar phase discriminator
stabilization against signal strength variations is provided
the circuit is the same as in a discriminator, except that the diodes are reversed
the linearity is worse than in phase discriminator
the output is twice that obtainable from a similar phase discriminator
stabilization against signal strength variations is provided
Answer
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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
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
Answer
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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
Reducing the effect of noise at low modulation depths
Improving the selectivity of the receiver
Improving the effectiveness of the AGC
Reducing the effect of negative-peak clipping
Reducing the effect of noise at low modulation depths
Improving the selectivity of the receiver
Improving the effectiveness of the AGC
Reducing the effect of negative-peak clipping
Answer
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Radio Receivers
Indicate the false statement in connection with communications receivers.
Variable sensitivity is used to eliminate selective fading
Double conversion is used to improve image rejection
A product demodulator could be used for the reception of Morse code.
The noise limiter cuts off the receiver’s output during a noise pulse.
Variable sensitivity is used to eliminate selective fading
Double conversion is used to improve image rejection
A product demodulator could be used for the reception of Morse code.
The noise limiter cuts off the receiver’s output during a noise pulse.
Answer
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Radio Receivers
Indicate which of the following statements about the advantages of the phase discriminator over the slope detector is false:
Much easier alignment
Fewer tuned circuits
Better linearity
Greater limiting
Much easier alignment
Fewer tuned circuits
Better linearity
Greater limiting
Answer
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