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Subelement F

Receivers

Section 43

Oscillators

Why is the Colpitts oscillator circuit commonly used in a VFO (variable frequency oscillator)?

  • It can be phase locked.
  • It can be remotely tuned.
  • Correct Answer
    It is stable.
  • It has little or no effect on the crystal’s stability.

Why is the Colpitts oscillator circuit commonly used in a VFO (variable frequency oscillator)?

It is stable.

See the Electronics Notes site for the articles on:

For an overview, please see the Tutorials Point site, for the article Sinusoidal Oscillators - Quick Guide

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What is the oscillator stage called in a frequency synthesizer?

  • Correct Answer
    VCO.
  • Divider.
  • Phase detector.
  • Reference standard.

What is the oscillator stage called in a frequency synthesizer?

VCO.

From wp2ahg:

A voltage-controlled oscillator or VCO is an electronic oscillator whose oscillation frequency is controlled by a voltage input.


See the Electronics Notes site for the articles on:

For an overview, please see the Tutorials Point site, for the article Sinusoidal Oscillators - Quick Guide

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What are three major oscillator circuits found in radio equipment?

  • Taft, Pierce, and negative feedback.
  • Colpitts, Hartley, and Taft.
  • Taft, Hartley, and Pierce.
  • Correct Answer
    Colpitts, Hartley, and Pierce.

What are three major oscillator circuits found in radio equipment?

Colpitts, Hartley, and Pierce.

Memory tip: Remember CHiPs!

A good to-the-point explanation on the kb6nu site called Oscillators and signal sources: types of oscillators; synthesizers and phase-locked loops; direct digital synthesizers; stabilizing thermal drift; microphonics; high-accuracy oscillators. The explanations are shorted than the title here.

Also, see the Electronics Notes site for the articles on:

For an overview, please see the Tutorials Point site, for the article Sinusoidal Oscillators - Quick Guide

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Which type of oscillator circuit is commonly used in a VFO (variable frequency oscillator)?

  • Correct Answer
    Colpitts.
  • Pierce.
  • Hartley.
  • Negative feedback.

Which type of oscillator circuit is commonly used in a VFO (variable frequency oscillator)?

Colpitts.

See the Electronics Notes site for the articles on:

For an overview, please see the Tutorials Point site, for the article Sinusoidal Oscillators - Quick Guide

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What condition must exist for a circuit to oscillate? It must:

  • Have a gain of less than 1.
  • Be neutralized.
  • Have sufficient negative feedback.
  • Correct Answer
    Have sufficient positive feedback.

What condition must exist for a circuit to oscillate? It must:

Have sufficient positive feedback.

See the Electronics Notes site for the articles on:

For an overview, please see the Tutorials Point site, for the article Sinusoidal Oscillators - Quick Guide

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In Figure 3F15, which block diagram symbol (labeled 1 through 4) is used to represent a local oscillator?

  • 1
  • Correct Answer
    2
  • 3
  • 4

In Figure 3F15, which block diagram symbol (labeled 1 through 4) is used to represent a local oscillator?

2

First, there is the RF Amplifier and tuning of the received signal from the antenna. Then, (1) is the mixer, and (2) is the local oscillator.

See the Electronics Notes site for the articles on:

Superheterodyne Receiver Block Diagram

For an overview, please see the Tutorials Point site, for the article Sinusoidal Oscillators - Quick Guide

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