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ATT Test #13: Questions & Complete Solutions
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ATT Test #13: Questions & Complete Solutions
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ATT Test #13: Questions & Complete SolutionsWhat is amplitude modulation? Right Ans - Information is encoded into
carrier wave by varying RF carriers amplitude and maintaining constant
frequency
AM IF signal is at what frequency? Right Ans - 455 kHz
FM IF signal is at what frequency? Right Ans - 10 MHz
When the carrier is modulated, where is the information located? Right
Ans - Upper and lower sidebands of composite signal
What is the difference frequency known as? Right Ans - Intermediate
Frequency
What is the receivers ability to faithfully reproduce a desired signal is based
on what two things? Right Ans - Its sensitivity and selectivity
What does Phase Lock Loop do? Right Ans - Compares output of VCO with a
reference frequency
What happens if the output of VCO is different than the reference frequency?
Right Ans - DC controlling voltage is generated to steer VCO to correct output
What frequency range do AM broadcasts use? Right Ans - 535-1605 kHz
What are two types of AM receiver tuning? Right Ans - Synthesized and
manual
What are two types of synthesized tuning? Right Ans - Direct and indirect
synthesis
What are 4 components of PLL? Right Ans - Phase detector, loop filter, VCO,
and frequency counter/divider
What are 3 benefits of synthesized tuning? Right Ans - Greater freq
stability, freq changed electronically, reduced cost, smaller size
, What type of tuning incorporates PLL and VCO to provide desired frequency?
Right Ans - Indirect synthesis
What type of tuning uses filtering, mixing, multiplication to provide specific
frequency? Right Ans - Direct synthesis
What is purpose of RF section? Right Ans - Eliminate all frequencies except
tuned RF
What is a significant advantage of SSB? Right Ans - Efficient use of RF
spectrum
SSB transmissions limit the effects of what? Right Ans - Selective feeding
What are 5 types of SSB? Right Ans - Pilot carrier, vestigial sideband,
lincompex, ISB, Standard SSB
What type of SSB is used by the military? Right Ans - ISB
What type of SSB is used by amateur radio operators? Right Ans - Standard
SSB
What type of SSB is used by TV video transmissions and conserves
bandwidth? Right Ans - Vestigial
What type of SSB has two sidebands that can each carry completely different
intelligence? Right Ans - ISB
What is the purpose of balanced modulator? Right Ans -
Eliminates/suppresses carrier
What is the heart of sideband generation? Right Ans - Balanced modulator
What are 3 methods for SSB generation? Right Ans - Filter method, phase
method, Third/Weaver method
What is a unique aspect of SSB? Right Ans - Must recreate carrier in order
for intel to be detected
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