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Radio Receivers
A receiver has poor IF selectivity. It will therefore also have poor
Blocking
Sensitivity
Diversion reception
Double-spotting
Blocking
Sensitivity
Diversion reception
Double-spotting
Answer
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Related Question
Radio Receivers
A low ratio of the ac to the dc load impedance of a diode detector results in
Diagonal clipping
Negative-peak clipping
Poor AGC operation
Poor AF response
Diagonal clipping
Negative-peak clipping
Poor AGC operation
Poor AF response
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
Reducing the effect of negative-peak clipping
Improving the effectiveness of the AGC
Reducing the effect of noise at low modulation depths
Improving the selectivity of the receiver
Reducing the effect of negative-peak clipping
Improving the effectiveness of the AGC
Answer
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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
stabilization against signal strength variations is provided
the output is twice that obtainable from a similar phase discriminator
the circuit is the same as in a discriminator, except that the diodes are reversed
the linearity is worse than in phase discriminator
stabilization against signal strength variations is provided
the output is twice that obtainable from a similar phase discriminator
Answer
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Radio Receivers
Indicate the false statement. Noting that no carrier is transmitter with J3E, we see that
The receiver cannot use a phase comparator for AFC
Production of AGC is a rather complicated process
Adjacent-channel rejection is more difficult
The transmission is not compatible with A3E
The receiver cannot use a phase comparator for AFC
Production of AGC is a rather complicated process
Adjacent-channel rejection is more difficult
The transmission is not compatible with A3E
Answer
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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 output must be tuned
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
The circuit is always biased in class C, by virtue of the leak-type bias.
Leak-type bias must be used
Answer
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