ATT TEST 13 EXAM LATEST 2025 ACTUAL EXAM
QUESTIONS AND CORRECT DETAILED ANSWERS
|ALREADY GRADED A.
What are the primary advantages of FM? - ANSWER>>Greater noise suppression, high
fidelity (stereo) reception, less interference (limits capture effect), reduced transmitter
power to cover assigned area
What are two types of phase detectors? - ANSWER>>Sequential (digital) and Multiplier
(no memory)
What is a general rule of thumb regarding the sun and frequency? - ANSWER>>The
higher the sun the higher the frequency
What is amplitude modulation? - ANSWER>>Information is encoded into carrier wave
by varying RF carriers’ amplitude and maintaining constant frequency
AM IF signal is at what frequency? - ANSWER>>455 kHz
FM IF signal is at what frequency? - ANSWER>>10 MHz
When the carrier is modulated, where is the information located? - ANSWER>>Upper
and lower sidebands of composite signal
What is the difference frequency known as? - ANSWER>>Intermediate Frequency
What is the receiver’s ability to faithfully reproduce a desired signal is based on what
two things? - ANSWER>>Its sensitivity and selectivity
What does Phase Lock Loop do? - ANSWER>>Compares output of VCO with a
reference frequency
, What happens if the output of VCO is different than the reference frequency? -
ANSWER>>DC controlling voltage is generated to steer VCO to correct output
What frequency range do AM broadcasts use? - ANSWER>>535-1605 kHz
What are two types of AM receiver tuning? - ANSWER>>Synthesized and manual
What are two types of synthesized tuning? - ANSWER>>Direct and indirect synthesis
What are 4 components of PLL? - ANSWER>>Phase detector, loop filter, VCO, and
frequency counter/divider
What are 3 benefits of synthesized tuning? - ANSWER>>Greater freq stability, freq
changed electronically, reduced cost, smaller size
What type of tuning incorporates PLL and VCO to provide desired frequency? -
ANSWER>>Indirect synthesis
What type of tuning uses filtering, mixing, multiplication to provide specific frequency? -
ANSWER>>Direct synthesis
What is purpose of RF section? - ANSWER>>Eliminate all frequencies except tuned RF
What is a significant advantage of SSB? - ANSWER>>Efficient use of RF spectrum
SSB transmissions limit the effects of what? - ANSWER>>Selective feeding
What are 5 types of SSB? - ANSWER>>Pilot carrier, vestigial sideband, lincompex,
ISB, Standard SSB
What type of SSB is used by the military? - ANSWER>>ISB
QUESTIONS AND CORRECT DETAILED ANSWERS
|ALREADY GRADED A.
What are the primary advantages of FM? - ANSWER>>Greater noise suppression, high
fidelity (stereo) reception, less interference (limits capture effect), reduced transmitter
power to cover assigned area
What are two types of phase detectors? - ANSWER>>Sequential (digital) and Multiplier
(no memory)
What is a general rule of thumb regarding the sun and frequency? - ANSWER>>The
higher the sun the higher the frequency
What is amplitude modulation? - ANSWER>>Information is encoded into carrier wave
by varying RF carriers’ amplitude and maintaining constant frequency
AM IF signal is at what frequency? - ANSWER>>455 kHz
FM IF signal is at what frequency? - ANSWER>>10 MHz
When the carrier is modulated, where is the information located? - ANSWER>>Upper
and lower sidebands of composite signal
What is the difference frequency known as? - ANSWER>>Intermediate Frequency
What is the receiver’s ability to faithfully reproduce a desired signal is based on what
two things? - ANSWER>>Its sensitivity and selectivity
What does Phase Lock Loop do? - ANSWER>>Compares output of VCO with a
reference frequency
, What happens if the output of VCO is different than the reference frequency? -
ANSWER>>DC controlling voltage is generated to steer VCO to correct output
What frequency range do AM broadcasts use? - ANSWER>>535-1605 kHz
What are two types of AM receiver tuning? - ANSWER>>Synthesized and manual
What are two types of synthesized tuning? - ANSWER>>Direct and indirect synthesis
What are 4 components of PLL? - ANSWER>>Phase detector, loop filter, VCO, and
frequency counter/divider
What are 3 benefits of synthesized tuning? - ANSWER>>Greater freq stability, freq
changed electronically, reduced cost, smaller size
What type of tuning incorporates PLL and VCO to provide desired frequency? -
ANSWER>>Indirect synthesis
What type of tuning uses filtering, mixing, multiplication to provide specific frequency? -
ANSWER>>Direct synthesis
What is purpose of RF section? - ANSWER>>Eliminate all frequencies except tuned RF
What is a significant advantage of SSB? - ANSWER>>Efficient use of RF spectrum
SSB transmissions limit the effects of what? - ANSWER>>Selective feeding
What are 5 types of SSB? - ANSWER>>Pilot carrier, vestigial sideband, lincompex,
ISB, Standard SSB
What type of SSB is used by the military? - ANSWER>>ISB
