Canadian Advanced pool, section 5-01

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Subelement 5

Transmitters, Modulation and Processing

Section 5-01

oscillator circuits, phase locked loop (PLL)

5-01-01

How is the positive feedback coupled to the input in a Hartley oscillator?

Correct Answer
A.
Through a tapped coil
B.
Through a capacitive divider
C.
Through link coupling
D.
Through a neutralizing capacitor

5-01-01

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5-01-02

How is positive feedback coupled to the input in a Colpitts oscillator?

A.
Through a tapped coil
B.
Through a neutralizing capacitor
C.
Through a link coupling
Correct Answer
D.
Through a capacitive divider

5-01-02

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5-01-03

How is positive feedback coupled to the input in a Pierce oscillator?

A.
Through a neutralizing capacitor
B.
Through link coupling
Correct Answer
C.
Through capacitive coupling
D.
Through a tapped coil

5-01-03

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5-01-04

Why is the Colpitts oscillator circuit commonly used in a VFO?

A.
It can be used with or without crystal lock-in
Correct Answer
B.
It is stable
C.
The frequency is a linear function with load impedance
D.
It has high output power

5-01-04

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5-01-05

Why must a very stable reference oscillator be used as part of a phaselocked loop (PLL) frequency synthesizer?

A.
Any phase variations in the reference oscillator signal will produce harmonic distortion in the modulating signal
Correct Answer
B.
Any phase variations in the reference oscillator signal will produce phase noise in the synthesizer output
C.
Any amplitude variations in the reference oscillator signal will prevent the loop from changing frequency
D.
Any amplitude variations in the reference oscillator signal will prevent the loop from locking to the desired signal

5-01-05

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5-01-06

Positive feedback from a capacitive divider indicates the oscillator type is:

A.
Pierce
B.
Hartley
C.
Miller
Correct Answer
D.
Colpitts

5-01-06

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5-01-07

In an oscillator circuit designed for high stability, the positive feedback is drawn from two capacitors connected in series. These two capacitors would most likely be:

A.
ceramic
B.
electrolytics
C.
mylar
Correct Answer
D.
silver mica

5-01-07

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5-01-08

In an oscillator circuit where positive feedback is obtained through a single capacitor in series with the crystal, the type of oscillator is:

A.
Colpitts
B.
Hartley
C.
Miller
Correct Answer
D.
Pierce

5-01-08

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5-01-09

A circuit depending on positive feedback for its operation would be a:

A.
mixer
B.
detector
Correct Answer
C.
variable-frequency oscillator
D.
audio amplifier

5-01-09

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5-01-10

An apparatus with an oscillator and a class C amplifier would be:

Correct Answer
A.
a two-stage CW transmitter
B.
a fixed-frequency single-sideband transmitter
C.
a two-stage frequency-modulated transmitter
D.
a two-stage regenerative receiver

5-01-10

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5-01-11

In an oscillator where positive feedback is provided through a capacitor in series with a crystal, that type of oscillator is a:

A.
Colpitts
B.
Hartley
C.
Franklin
Correct Answer
D.
Pierce

5-01-11

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