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A super heterodyne radio receiver with an intermediate frequency of 455 KHz. is tuned to a station operating at 1200 KHz. The associated image frequency is _____________ KHz
- a)2110
- b)2153
- c)2456
- d)1254
Correct answer is option 'A'. Can you explain this answer?
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A super heterodyne radio receiver with an intermediate frequency of 45...
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A super heterodyne radio receiver with an intermediate frequency of 45...
Superheterodyne Receiver Basics:
- The superheterodyne receiver is a type of radio receiver that uses frequency mixing to convert the incoming radio frequency (RF) signal to a lower frequency called the intermediate frequency (IF).
- The IF frequency is chosen to be fixed and is typically higher than the highest frequency of the signals to be received.
Calculating the Image Frequency:
- To calculate the image frequency, we use the following formula:
Image Frequency = 2 * IF - Incoming RF Frequency
- In this case, the IF frequency is given as 455 KHz, and the tuned station frequency is 1200 KHz.
- Substituting the values into the formula:
Image Frequency = 2 * 455 KHz - 1200 KHz
= 910 KHz - 1200 KHz
= -290 KHz
Determining the Correct Answer:
- The image frequency is negative, indicating that it lies below the IF frequency.
- We need to find the positive value of the image frequency.
- The correct answer is the option that lies closest to the absolute value of the negative image frequency.
- Let's calculate the absolute value of the image frequency:
Absolute Value of Image Frequency = |-290 KHz| = 290 KHz
- Among the given options, option A, 2110 KHz, is the closest to 290 KHz.
- Therefore, the correct answer is option A, 2110 KHz.
Final Answer:
- The associated image frequency is 2110 KHz (option A).
- The superheterodyne receiver is a type of radio receiver that uses frequency mixing to convert the incoming radio frequency (RF) signal to a lower frequency called the intermediate frequency (IF).
- The IF frequency is chosen to be fixed and is typically higher than the highest frequency of the signals to be received.
Calculating the Image Frequency:
- To calculate the image frequency, we use the following formula:
Image Frequency = 2 * IF - Incoming RF Frequency
- In this case, the IF frequency is given as 455 KHz, and the tuned station frequency is 1200 KHz.
- Substituting the values into the formula:
Image Frequency = 2 * 455 KHz - 1200 KHz
= 910 KHz - 1200 KHz
= -290 KHz
Determining the Correct Answer:
- The image frequency is negative, indicating that it lies below the IF frequency.
- We need to find the positive value of the image frequency.
- The correct answer is the option that lies closest to the absolute value of the negative image frequency.
- Let's calculate the absolute value of the image frequency:
Absolute Value of Image Frequency = |-290 KHz| = 290 KHz
- Among the given options, option A, 2110 KHz, is the closest to 290 KHz.
- Therefore, the correct answer is option A, 2110 KHz.
Final Answer:
- The associated image frequency is 2110 KHz (option A).
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A super heterodyne radio receiver with an intermediate frequency of 45...
2110
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