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Subelement 6

Receivers

Section 6-01

single, double conversion superheterodyne architecture

What are the advantages of the frequency-conversion process in a superheterodyne receiver?

  • Automatic detection in the RF amplifier and increased sensitivity
  • Automatic soft-limiting and automatic squelching
  • Correct Answer
    Increased selectivity and optimal tuned circuit design
  • Automatic squelching and increased sensitivity
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What factors should be considered when selecting an intermediate frequency?

  • Correct Answer
    Image rejection
  • Noise figure and distortion
  • Interference to other services
  • Cross-modulation distortion and interference
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One of the greatest advantages of the double-conversion over the singleconversion receiver is that it:

  • is much more stable
  • is much more sensitive
  • Correct Answer
    suffers less from image interference
  • produces a louder signal at the output
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In a communications receiver, a crystal filter would be located in the:

  • Correct Answer
    IF circuits
  • local oscillator
  • audio output stage
  • detector
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A multiconversion superheterodyne receiver is more susceptible to spurious responses than a single-conversion receiver because of the:

  • Correct Answer
    additional oscillators and mixing frequencies involved in the design
  • poorer selectivity in the IF caused by the multitude of frequency changes
  • greater sensitivity introducing higher levels of RF to the receiver
  • AGC being forced to work harder causing the stages concerned to overload
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Most superheterodyne receivers operating on the HF amateur bands through to 30 MHz use a standard intermediate frequency (IF) of:

  • 200 kHz
  • Correct Answer
    455 kHz
  • 500 kHz
  • 355 kHz
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Which stage of a receiver has its input and output circuits tuned to the received frequency?

  • The local oscillator
  • The audio frequency amplifier
  • The detector
  • Correct Answer
    The RF amplifier
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Which stage of a superheterodyne receiver lies between a tuneable stage and a fixed tuned stage?

  • Radio frequency amplifier
  • Intermediate frequency amplifier
  • Local oscillator
  • Correct Answer
    Mixer
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A single conversion receiver with a 9 MHz IF has a local oscillator operating at 16 MHz. The frequency it is tuned to is:

  • 16 MHz
  • 21 MHz
  • 9 MHz
  • Correct Answer
    7 MHz
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A double conversion receiver designed for SSB reception has a beat frequency oscillator and:

  • one IF stage and one local oscillator
  • Correct Answer
    two IF stages and two local oscillators
  • two IF stages and three local oscillators
  • two IF stages and one local oscillator
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The advantage of a double conversion receiver over a single conversion receiver is that it:

  • does not drift off frequency
  • Correct Answer
    suffers less from image interference
  • is a more sensitive receiver
  • produces a louder audio signal
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