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ATT Test #13 Study Questions and Answers Graded 2025

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What is amplitude modulation? -Correct Answer Information is encoded into carrier wave by varying RF carriers’ amplitude and maintaining constant frequency AM IF signal is at what frequency? -Correct Answer 455 kHz FM IF signal is at what frequency? -Correct Answer 10 MHz When the carrier is modulated, where is the information located? -Correct Answer Upper and lower sidebands of composite signal What is the difference frequency known as? -Correct Answer Intermediate Frequency What is the receivers ability to faithfully reproduce a desired signal is based on what two things? -Correct Answer Its sensitivity and selectivity What does Phase Lock Loop do? -Correct Answer Compares output of VCO with a reference frequency What happens if the output of VCO is different than the reference frequency? -Correct Answer DC controlling voltage is generated to steer VCO to correct output What frequency range do AM broadcasts use? -Correct Answer 535-1605 kHz What are two types of AM receiver tuning? -Correct Answer Synthesized and manual What are two types of synthesized tuning? -Correct Answer Direct and indirect synthesis What are 4 components of PLL? -Correct Answer Phase detector, loop filter, VCO, and frequency counter/divider What are 3 benefits of synthesized tuning? -Correct Answer Greater freq stability, freq changed electronically, reduced cost, smaller size What type of tuning incorporates PLL and VCO to provide desired frequency? -Correct Answer Indirect synthesis What type of tuning uses filtering, mixing, multiplication to provide specific frequency? -Correct Answer Direct synthesis

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ATT Test


ATT Test #13 Study Questions and Answers
Graded 2025
What is amplitude modulation? -Correct Answer ✔Information is encoded into carrier
wave by varying RF carriers’ amplitude and maintaining constant frequency

AM IF signal is at what frequency? -Correct Answer ✔455 kHz

FM IF signal is at what frequency? -Correct Answer ✔10 MHz

When the carrier is modulated, where is the information located? -Correct Answer
✔Upper and lower sidebands of composite signal

What is the difference frequency known as? -Correct Answer ✔Intermediate Frequency

What is the receivers ability to faithfully reproduce a desired signal is based on what two
things? -Correct Answer ✔Its sensitivity and selectivity

What does Phase Lock Loop do? -Correct Answer ✔Compares output of VCO with a
reference frequency

What happens if the output of VCO is different than the reference frequency? -Correct
Answer ✔DC controlling voltage is generated to steer VCO to correct output

What frequency range do AM broadcasts use? -Correct Answer ✔535-1605 kHz

What are two types of AM receiver tuning? -Correct Answer ✔Synthesized and manual

What are two types of synthesized tuning? -Correct Answer ✔Direct and indirect
synthesis

What are 4 components of PLL? -Correct Answer ✔Phase detector, loop filter, VCO,
and frequency counter/divider

What are 3 benefits of synthesized tuning? -Correct Answer ✔Greater freq stability, freq
changed electronically, reduced cost, smaller size

What type of tuning incorporates PLL and VCO to provide desired frequency? -Correct
Answer ✔Indirect synthesis

What type of tuning uses filtering, mixing, multiplication to provide specific frequency? -
Correct Answer ✔Direct synthesis

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