Interference and Suppression
front-end overload, cross-modulation
What is meant by receiver overload?
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Interference caused by turning the volume up too high
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Too much current from the power supply
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Correct AnswerInterference caused by strong signals from a nearby transmitter
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Too much voltage from the power supply
Tags: none
What is one way to tell if radio frequency interference to a receiver is caused by front-end overload?
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If grounding the receiver makes the problem worse
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If connecting a low pass filter to the receiver greatly cuts down the interference
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Correct AnswerIf the interference is about the same no matter what frequency is used for the transmitter
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If connecting a low pass filter to the transmitter greatly cuts down the interference
Tags: none
If a neighbour reports television interference whenever you transmit, no matter what band you use, what is probably the cause of the interference?
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Incorrect antenna length
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Receiver VR tube discharge
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Correct AnswerReceiver overload
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Too little transmitter harmonic suppression
Tags: none
What type of filter should be connected to a TV receiver as the first step in trying to prevent RF overload from an amateur HF station transmission?
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Correct AnswerHigh-pass
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Low-pass
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Band-pass
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No filter
Tags: none
When the signal from a transmitter overloads the audio stages of a broadcast receiver, the transmitted signal:
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is distorted on voice peaks
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Correct Answercan appear wherever the receiver is tuned
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appears only on one frequency
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appears only when a station is tuned
Tags: none
Cross-modulation of a broadcast receiver by a nearby transmitter would be noticed in the receiver as:
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interference only when a broadcast signal is tuned
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Correct Answerthe undesired signal in the background of the desired signal
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distortion on transmitted voice peaks
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interference continuously across the dial
Tags: none
What is cross-modulation interference?
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Interference between two transmitters of different modulation type
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Interference caused by audio rectification in the receiver reamplifier
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Harmonic distortion of the transmitted signal
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Correct AnswerModulation from an unwanted signal is heard in addition to the desired signal
Tags: none
What is the term used to refer to the condition where the signals from a very strong station are superimposed on other signals being received?
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Receiver quieting
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Correct AnswerCross-modulation interference
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Capture effect
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Intermodulation distortion
Tags: none
What is the result of cross-modulation?
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Receiver quieting
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A decrease in modulation level of transmitted signals
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Inverted sidebands in the final stage of the amplifier
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Correct AnswerThe modulation of an unwanted signal is heard on the desired signal
Tags: none
If a television receiver suffers from cross-modulation when a nearby amateur transmitter is operating at 14 MHz, which of the following cures might be effective?
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A low pass filter attached to the antenna output of the transmitter
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A high pass filter attached to the antenna output of the transmitter
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Correct AnswerA high pass filter attached to the antenna input of the television
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A low pass filter attached to the antenna input of the television
Tags: none
How can cross-modulation be reduced?
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Correct AnswerBy installing a suitable filter at the receiver
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By using a better antenna
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By increasing the receiver RF gain while decreasing the AF gain
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By adjusting the passband tuning
Tags: none
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