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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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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