Canadian Advanced pool, section 6-02

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Subelement 6

Receivers

Section 6-02

oscillators, mixers, tuning

6-02-01

The mixer stage of a superheterodyne receiver is used to:

A.
allow a number of IF frequencies to be used
B.
remove image signals from the receiver
C.
produce an audio frequency for the speaker
Correct Answer
D.
change the frequency of the incoming signal to that of the IF

6-02-01

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6-02-02

A superheterodyne receiver designed for SSB reception must have a beatfrequency oscillator (BFO) because:

Correct Answer
A.
the suppressed carrier must be replaced for detection
B.
it phases out the unwanted sideband signal
C.
it reduces the pass-band of the IF stages
D.
it beats with the receiver carrier to produce the missing sideband

6-02-02

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6-02-03

The first mixer in the receiver mixes the incoming signal with the local oscillator to produce:

A.
an audio frequency
B.
a radio frequency
C.
a high frequency oscillator (HFO) frequency
Correct Answer
D.
an intermediate frequency

6-02-03

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6-02-04

If the incoming signal to the mixer is 3 600 kHz and the first IF is 9 MHz, at which one of the following frequencies would the high frequency oscillator (HFO) operate?

Correct Answer
A.
5 400 kHz
B.
3 400 kHz
C.
10 600 kHz
D.
21 600 kHz

6-02-04

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6-02-05

The BFO is off-set slightly (500 - 1 500 Hz) from the incoming signal to the detector. This is required:

Correct Answer
A.
to beat with the incoming signal
B.
to pass the signal without interruption
C.
to provide additional amplification
D.
to protect the incoming signal from interference

6-02-05

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6-02-06

It is very important that the oscillators contained in a superheterodyne receiver are:

Correct Answer
A.
stable and spectrally pure
B.
sensitive and selective
C.
stable and sensitive
D.
selective and spectrally pure

6-02-06

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6-02-07

In a superhetrodyne receiver, a stage before the IF amplifier has a variable capacitor in parallel with a trimmer capacitor and an inductance. The variable capacitor is for:

A.
tuning both the antenna and the BFO
B.
tuning of the beat-frequency oscillator (BFO)
C.
tuning both the antenna and the HFO
Correct Answer
D.
tuning of the high-frequency oscillator (HFO)

6-02-07

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6-02-08

In a superhetrodyne receiver without an RF amplifier, the input to the mixer stage has a variable capacitor in parallel with an inductance. The variable capacitor is for:

A.
tuning both the antenna and the BFO
B.
tuning the beat-frequency oscillator (BFO)
C.
tuning both the antenna and the HFO
Correct Answer
D.
tuning of the antenna

6-02-08

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6-02-09

What receiver stage combines a 14.25-MHz input signal with a 13.795-MHz oscillator signal to produce a 455-kHz intermediate frequency (IF) signal?

A.
BFO
B.
VFO
C.
Multiplier
Correct Answer
D.
Mixer

6-02-09

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6-02-10

Which two stages in a superheterodyne receiver have input tuned circuits tuned to the same frequency?

A.
IF and local oscillator
B.
RF and IF
C.
RF and local oscillator
Correct Answer
D.
RF and first mixer

6-02-10

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6-02-11

The mixer stage of a superheterodyne receiver:

Correct Answer
A.
produces an intermediate frequency
B.
produces spurious signals
C.
acts as a buffer stage
D.
demodulates SSB signals

6-02-11

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