Receiving Systems
Subelement C
Section 19
Receiving Systems
Which of the following statements is true?
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Correct AnswerThe front end of the receiver does not provide any amplification to the RADAR signal.
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The mixer provides a gain of at least 6 db.
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The I.F. amplifier is always a high gain, narrow bandwidth amplifier.
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None of the above.
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Logarithmic receivers:
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Can't be damaged.
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Correct AnswerCan't be saturated.
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Should not be used in RADAR systems.
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Have low sensitivity.
Logarithmic receivers:
Can't be saturated.
Logarithmic receivers are designed to have a wide dynamic range, meaning they can handle a broad range of input signal power levels without saturating. Saturation occurs when the input signal power is too high, causing the receiver to reach its maximum output level, and any further increase in signal power does not result in a corresponding increase in the receiver's output.
In a logarithmic receiver, the output response to the input signal is logarithmic in nature. As the input signal power increases, the output signal increases, but not at the same rate as the input power. Instead, the output response gradually compresses or "rolls off," preventing saturation. This feature makes logarithmic receivers well-suited for applications where the input signal power can vary widely.
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RADAR receivers are similar to:
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FM receivers.
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HF receivers.
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T.V. receivers.
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Correct AnswerMicrowave receivers.
What section of the receiving system sends signals to the display system?
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Correct AnswerVideo amplifier.
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Audio amplifier.
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I.F. Amplifier.
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Resolver.
The section of the receiving system that sends signals to the display system is the video amplifier.
In a RADAR system, after the received signals are processed and converted into a usable form, they are typically amplified before being sent to the display system. The video amplifier is responsible for amplifying the processed signals to an appropriate level for display.
The video amplifier takes the processed video signals and increases their strength or amplitude, ensuring that they are of sufficient magnitude to be accurately represented on the display system. This amplification process helps enhance the visibility and clarity of the RADAR data on the display.
By boosting the strength of the video signals, the video amplifier ensures that the displayed information is easily discernible and can be effectively analyzed by the RADAR operator or system user.
Mnemonic: "Display Booster"
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What is the main difference between an analog and a digital receiver?
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Special amplification circuitry.
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Correct AnswerThe presence of decision circuitry to distinguish between "on" and "off" signal levels.
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An AGC stage is not required in a digital receiver.
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Digital receivers produce no distortion.
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In a RADAR receiver, the RF power amplifier:
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Is high gain.
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Is low gain.
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Correct AnswerDoes not exist.
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Requires wide bandwidth.
The RF Power Amplifier is the final stage in a transmitter. Receivers therefore don't have RF Power Amplifiers and Answer C. is the right answer.
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