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Subel. C
6 questions
Subelement C

Receiving Systems

Section 22

Amplifiers

Overcoupling in a RADAR receiver will cause?

  • Improved target returns.
  • Increase the range of the IAGC.
  • Decrease noise.
  • Correct Answer
    Oscillations.
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The usual intermediate frequency of a shipboard RADAR unit is:

  • 455 kHz.
  • 10.7 MHz.
  • Correct Answer
    30 or 60 MHz.
  • 120 MHz.
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The I.F. Amplifier bandwidth is:

  • Correct Answer
    Wide for short ranges and narrow for long ranges.
  • Wide for long ranges and narrow for short ranges.
  • Constant for all ranges.
  • Adjustable from the control panel.

The Intermediate Frequency (I.F.) amplifier bandwidth is wide for short ranges and narrow for long ranges in the context of radio frequency (RF) communication systems.

In RF communication systems, the I.F. amplifier is a crucial component that processes the intermediate frequency signal. The purpose of the I.F. amplifier is to amplify the desired signal while rejecting unwanted noise and interfering signals.

For short ranges, such as in local communication systems or within a limited geographical area, the I.F. amplifier's bandwidth is typically wide. This wide bandwidth allows for a larger range of frequencies to pass through, capturing a broader spectrum of signals. In short-range applications, there is less concern about unwanted interference from distant sources, so a wider bandwidth is beneficial for capturing and amplifying the desired signal.

On the other hand, for long ranges, such as in long-distance communication systems or broadcasting, the I.F. amplifier's bandwidth is usually narrow. This narrower bandwidth is necessary to reject a larger portion of the spectrum, including unwanted noise and interfering signals from distant sources. In long-range applications, there is a higher likelihood of encountering more interfering signals, so a narrower bandwidth helps in filtering out unwanted signals and improving the signal-to-noise ratio.

Mnemonic: "Wide for Short, Narrow for Long"

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A logarithmic IF amplifier is preferable to a linear IF amplifier in a RADAR receiver because it:

  • Has higher gain.
  • Is more easily aligned.
  • Has a lower noise figure.
  • Correct Answer
    Has a greater dynamic range.
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The high-gain IF amplifiers in a RADAR receiver may amplify a 2 microvolt input signal to an output level of 2 volts. This amount of amplification represents a gain of:

  • 60 db.
  • 100 db.
  • Correct Answer
    120 db.
  • 1,000 db.
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In a RADAR receiver AGC and IAGC can vary between:

  • 10 and 15 db.
  • Correct Answer
    20 and 40 db.
  • 30 and 60 db.
  • 5 and 30 db.
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