Canadian Basic Qualification pool, section B-003-002

Subelement B-003

B-003

Section B-003-002

B-003-002-001

What does the microphone produce in an FM transmitter?

A.
A radio frequency signal driving the power amplifier
B.
A radio frequency signal driving the speech amplifier
C.
An electrical signal driving the oscillator
Correct Answer
D.
An electrical signal driving the speech amplifier

B-003-002-001

Sound, produced by mechanical vibrations, propagates through air as tiny pressure variations. A microphone converts these variations into an electrical signal. The speech amplifier brings up the feeble microphone signal to a working level.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-003-002-002

The microphone of an FM transmitter:

Correct Answer
A.
produces an electrical signal from air pressure changes
B.
has a different tone than other microphones
C.
is quieter than AM or SSB microphones
D.
has a wider frequency range than other microphones

B-003-002-002

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-003-002-003

An FM transmitter's modulator:

A.
alters the radio's output signal amplitude
B.
as no effect on the frequency of the oscillator
Correct Answer
C.
affects the frequency of the oscillator
D.
produces amplitude changes in the oscillator

B-003-002-003

One way to produce an FM signal (frequency modulation) is to use a modulator to impart frequency variations on the oscillator. That modulator is inserted between the speech amplifier and the oscillator. The frequency variations are termed frequency deviation.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-003-002-004

How is the oscillator in the FM transmitter different from oscillators in AM, CW, and SSB transmitters?

A.
The modulator changes its output amplitude
Correct Answer
B.
The modulator alters its frequency
C.
It has higher fidelity
D.
It runs at much higher frequencies

B-003-002-004

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-003-002-005

In an FM transmitter, the frequency multiplier:

A.
allows the oscillator to be run at very high frequencies
B.
is the major load fed by the power supply
Correct Answer
C.
produces the FM output carrier frequency
D.
produces a low distortion audio response

B-003-002-005

In an FM transmitter using a multiplier, frequency deviation is applied to an oscillator operating at a relatively low frequency. The modulated radio signal is then multiplied up to the operating frequency. The multiplier produces an integer multiple (a useful harmonic, so to speak) of the signal supplied by the oscillator.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-003-002-006

In an FM transmitter, which stage produces a useful harmonic?

A.
Power amplifier
B.
Speech amplifier
Correct Answer
C.
Frequency multiplier
D.
Modulator

B-003-002-006

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-003-002-007

In an FM transmitter, which stage draws the most electric power?

A.
Speech amplifier
Correct Answer
B.
Power amplifier
C.
Oscillator
D.
Frequency multiplier

B-003-002-007

In all transmitters, the last stage before the antenna is a power amplifier which imparts the transmitted signal its actual power. All preceding stages operate with little power.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

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