3-F-043: Oscillators
3-43F1:
Why is the Colpitts oscillator circuit commonly used in a VFO (variable frequency oscillator)?
It is stable.
It can be phase locked.
It can be remotely tuned.
It has little or no effect on the crystal’s stability.
3-43F2:
What is the oscillator stage called in a frequency synthesizer?
VCO.
Divider.
Phase detector.
Reference standard.
3-43F3:
What are three major oscillator circuits found in radio equipment?
Colpitts, Hartley, and Pierce.
Taft, Pierce, and negative feedback.
Colpitts, Hartley, and Taft.
Taft, Hartley, and Pierce.
3-43F4:
Which type of oscillator circuit is commonly used in a VFO (variable frequency oscillator)?
Colpitts.
Pierce.
Hartley.
Negative feedback.
3-43F5:
What condition must exist for a circuit to oscillate? It must:
Have sufficient positive feedback.
Have a gain of less than 1.
Be neutralized.
Have sufficient negative feedback.
3-43F6:
In Figure 3F15, which block diagram symbol (labeled 1 through 4) is used to represent a local oscillator?
2
1
3
4
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