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Subel. F
6 questions
Subelement F

Receivers

Section 50

Receiver Performance

Where would you normally find a low-pass filter in a radio receiver?

  • In the AVC circuit.
  • In the Oscillator stage.
  • In the Power Supply.
  • Correct Answer
    A and C, but not B.

Where would you normally find a low-pass filter in a radio receiver?

A and C, but not B.

  • A => In the AVC circuit.
  • C => In the Power Supply.

See Wikipedia's article on Low-pass filter

Also, see the Engineering360 site for the article Long Pass Filters and Short Pass Filters Information

And, the RF Page site for the article on Low Pass, High Pass and Band Pass Filters – Simple Explanation

Please see, the Electronics Notes site for the article on RF & Microwave Filters: the basics

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How can ferrite beads be used to suppress ignition noise? Install them:

  • In the resistive high voltage cable every 2 years.
  • Between the starter solenoid and the starter motor.
  • Correct Answer
    Install them in the primary and secondary ignition leads.
  • In the antenna lead.

How can ferrite beads be used to suppress ignition noise? Install them:

Install them in the primary and secondary ignition leads.

From sammylandler:

To suppress ignition noise, install ferrite beads in the primary and secondary ignition leads.

It's the only answer with the word ignition in it.

See the Crutchfield site for the article on Car audio noise suppression guide

Also, see the Machine Design site for the article Eliminating EMI in motion systems

Last edited by markadlerdallas. Register to edit

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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?

  • Intermodulation distortion.
  • Correct Answer
    Cross-modulation interference.
  • Receiver quieting.
  • Capture effect.

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?

Cross-modulation interference.

It is an interference stemming from the receiver's preamplifier. The modulation creates an additional signal that is forwarded with the signal selected.

It can be a harmonic distortion of a signal. The cross modulation is what is perceived as more than the selected signal.

Please see the Electronics Notes for the article Cross Modulation in Radio Receivers

Also, see the ScienceDirect site for the article Cross Modulation

And, please see the Cite See RX Ist Psu Edu site for the pdf document called Cross-Modulation Interference With Lateralization of Mixed-Modulated Waveforms

Last edited by markadlerdallas. Register to edit

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What is cross-modulation interference?

  • Interference between two transmitters of different modulation type.
  • Interference caused by audio rectification in the receiver preamp.
  • Correct Answer
    Modulation from an unwanted signal heard in addition to the desired signal.
  • Harmonic distortion of the transmitted signal.

What is cross-modulation interference?

Modulation from an unwanted signal heard in addition to the desired signal.

It is an interference stemming from the receiver's preamplifier. The modulation creates an additional signal that is forwarded with the signal selected. It can be a harmonic distortion of a signal. The cross modulation is what is perceived as more than the selected signal.

Please see the Electronics Notes for the article Cross Modulation in Radio Receivers

Also, see the ScienceDirect site for the article Cross Modulation

And, please see the Cite See RX Ist Psu Edu site for the pdf document called Cross-Modulation Interference With Lateralization of Mixed-Modulated Waveforms

Last edited by markadlerdallas. Register to edit

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In Figure 3F15 at what point in the circuit (labeled 1 through 4) could a DC voltmeter be used to monitor signal strength?

  • 1
  • 2
  • 3
  • Correct Answer
    4

In Figure 3F15 at what point in the circuit (labeled 1 through 4) could a DC voltmeter be used to monitor signal strength?

4

From ai7je: This appears to be a radio receiver equipped with an automatic gain control circuit.

Component 4 is a rectifier.

As we are using a DC voltmeter, component 4 would be the only listed location where we would not be detecting AC voltage.

See Wikipedia's article on Rectifier

Also, see the Electrical Technology site for the article What is Rectifier? Types of Rectifiers and their Operation

And, see the Science ABC site for the article How Does A Rectifier Work?

Please see the All About Circuits site for the article Rectifier Circuits.

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Pulse type interference to automobile radio receivers that appears related to the speed of the engine can often be reduced by:

  • Correct Answer
    Installing resistances in series with spark plug wires.
  • Using heavy conductors between the starting battery and the starting motor.
  • Connecting resistances in series with the battery.
  • Grounding the negative side of the battery.

Pulse type interference to automobile radio receivers that appears related to the speed of the engine can often be reduced by:

Installing resistances in series with spark plug wires.

See the Crutchfield site for the article on Car audio noise suppression guide

Also, see the Machine Design site for the article Eliminating EMI in motion systems

Last edited by markadlerdallas. Register to edit

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