Next- Generation wireless Solutions Exam Questions and Answers with Complete Solutions.
Changing the speed that the radius completes its cycle or __________ varies the length of the sine wave
within a carrier - Answers Frequency
Changing the angle of the radius during and between Cycles modifies the _________ of the carrier wave
- Answers Amplitude
____________ refers to the difference in timing between two sine waves of the same frequency -
Answers Phase
From what is a sine wave created? - Answers a sine wave is Created from the values of sine through a
full counterclockwise rotation at 0, 45, 90, 135, 180, 225, 270, 3:15, and 360° plotted on a graph
in the circular reference with the right triangle, what represents the amplitude or power in the sine
wave? - Answers the triangles vertical line length changing while the radius length remains constant
during a full cycle represents the amplitude or power in the sine wave
modulation index= - Answers modulating signal level/ unmodulated Carrier level
In an AM waveform envelope for modulation index of .5, the modulation signal is the same amplitude as
the carrier. - Answers For a modulation index of 1.0, the modulation signal is the same amplitude as the
carrier
in a hybrid fiber coax hfc Network, a corroded connector or seizure screw forms a______________ that
acts as an envelope detector - Answers Crude diode
When demodulating in the am waveform, High Distortion and insensitivity to low signals can be
overcome using__________ - Answers synchronous detection
how much of the power is in an AM transmission carrier - Answers Two thirds in the carrier 1/3 in the
sidebands
Broadcast over-the-air digital TV uses ___________ with the carrier modulated with eight discrete signal
levels, each conveying 3 bits (Figure 2). - Answers 8 VSB
Suppressing the carrier of the AM waveform allows the power that would be in the carrier to go into the
sidebands. This can give greater range for the same transmitted power or allow lower power
transmission, preserving the battery in portable radios. - Answers Double sideband
Vestigial sideband - Answers Produced by using filters to eliminate most of the lower sideband so that
only a "vestige" of the sideband remains.
Double sideband suppressed carrier - Answers Gives greater range for the same transmitted power or
allows lower power transmission, preserving the battery in portable radios.
, Single sideband - Answers Used in marine, aviation, military, and amateur radio applications for long
range voice communications.
Why is the modulation information generally called baseband information or a baseband signal? -
Answers The modulation information is usually in its basic native electrical format, which is why it is
often called baseband information or a baseband signal.
What is the relationship of the bandwidth of an amplitude modulation (AM) carrier and its modulation
signal? - Answers The bandwidth of an AM carrier is twice the bandwidth of its modulation signal.
What does the modulation index in amplitude modulation (AM) express? - Answers For AM, the levels of
modulation are expressed in the modulation index; the ratio of the modulating signal level to the
unmodulated carrier
What are the two types of detection that are used to demodulate amplitude modulation (AM)
waveforms? - Answers Envelope and synchronous detection
What type of amplitude modulation (AM) is used for analog television transmission? - Answers Analog
television transmission use vestigial sideband (VSB) to conserve bandwidth.
MI equals - Answers Modulation index
∆f = - Answers frequency deviation from center (at maximum modulation signal level)
fmax = - Answers maximum modulation frequency
For FM radio broadcasting in North America, the allocated bandwidth is In an analog TV channel, the
frequency deviation is also 75 kHz and the maximum modulating frequency is 25 kHz, for a modulation
index of 3 (75 ÷ 25 = 3). - Answers 75 kHz on either side of the carrier, and the maximum modulating
frequency is 15 kHz.
The FM modulation index is calculated by dividing the______________ (75 kHz) by the____________
frequency (15 kHz), for a modulation index of 5 (75 ÷ 15 = 5). - Answers Frequency deviation, maximum
modulating
In an analog TV channel, the _________ is also 75 kHz and the___________ frequency is 25 kHz, for a
modulation index of 3 (75 ÷ 25 = 3). - Answers frequency deviation, maximum modulating
The __________ of an AM carrier is twice as wide as the highest modulating frequency, and the
components in the sidebands are equal to the components in the modulating signal. - Answers
maximum bandwidth
As the __________ increases the number of___________ also increases. - Answers modulation index
(MI), significant sidebands
Changing the speed that the radius completes its cycle or __________ varies the length of the sine wave
within a carrier - Answers Frequency
Changing the angle of the radius during and between Cycles modifies the _________ of the carrier wave
- Answers Amplitude
____________ refers to the difference in timing between two sine waves of the same frequency -
Answers Phase
From what is a sine wave created? - Answers a sine wave is Created from the values of sine through a
full counterclockwise rotation at 0, 45, 90, 135, 180, 225, 270, 3:15, and 360° plotted on a graph
in the circular reference with the right triangle, what represents the amplitude or power in the sine
wave? - Answers the triangles vertical line length changing while the radius length remains constant
during a full cycle represents the amplitude or power in the sine wave
modulation index= - Answers modulating signal level/ unmodulated Carrier level
In an AM waveform envelope for modulation index of .5, the modulation signal is the same amplitude as
the carrier. - Answers For a modulation index of 1.0, the modulation signal is the same amplitude as the
carrier
in a hybrid fiber coax hfc Network, a corroded connector or seizure screw forms a______________ that
acts as an envelope detector - Answers Crude diode
When demodulating in the am waveform, High Distortion and insensitivity to low signals can be
overcome using__________ - Answers synchronous detection
how much of the power is in an AM transmission carrier - Answers Two thirds in the carrier 1/3 in the
sidebands
Broadcast over-the-air digital TV uses ___________ with the carrier modulated with eight discrete signal
levels, each conveying 3 bits (Figure 2). - Answers 8 VSB
Suppressing the carrier of the AM waveform allows the power that would be in the carrier to go into the
sidebands. This can give greater range for the same transmitted power or allow lower power
transmission, preserving the battery in portable radios. - Answers Double sideband
Vestigial sideband - Answers Produced by using filters to eliminate most of the lower sideband so that
only a "vestige" of the sideband remains.
Double sideband suppressed carrier - Answers Gives greater range for the same transmitted power or
allows lower power transmission, preserving the battery in portable radios.
, Single sideband - Answers Used in marine, aviation, military, and amateur radio applications for long
range voice communications.
Why is the modulation information generally called baseband information or a baseband signal? -
Answers The modulation information is usually in its basic native electrical format, which is why it is
often called baseband information or a baseband signal.
What is the relationship of the bandwidth of an amplitude modulation (AM) carrier and its modulation
signal? - Answers The bandwidth of an AM carrier is twice the bandwidth of its modulation signal.
What does the modulation index in amplitude modulation (AM) express? - Answers For AM, the levels of
modulation are expressed in the modulation index; the ratio of the modulating signal level to the
unmodulated carrier
What are the two types of detection that are used to demodulate amplitude modulation (AM)
waveforms? - Answers Envelope and synchronous detection
What type of amplitude modulation (AM) is used for analog television transmission? - Answers Analog
television transmission use vestigial sideband (VSB) to conserve bandwidth.
MI equals - Answers Modulation index
∆f = - Answers frequency deviation from center (at maximum modulation signal level)
fmax = - Answers maximum modulation frequency
For FM radio broadcasting in North America, the allocated bandwidth is In an analog TV channel, the
frequency deviation is also 75 kHz and the maximum modulating frequency is 25 kHz, for a modulation
index of 3 (75 ÷ 25 = 3). - Answers 75 kHz on either side of the carrier, and the maximum modulating
frequency is 15 kHz.
The FM modulation index is calculated by dividing the______________ (75 kHz) by the____________
frequency (15 kHz), for a modulation index of 5 (75 ÷ 15 = 5). - Answers Frequency deviation, maximum
modulating
In an analog TV channel, the _________ is also 75 kHz and the___________ frequency is 25 kHz, for a
modulation index of 3 (75 ÷ 25 = 3). - Answers frequency deviation, maximum modulating
The __________ of an AM carrier is twice as wide as the highest modulating frequency, and the
components in the sidebands are equal to the components in the modulating signal. - Answers
maximum bandwidth
As the __________ increases the number of___________ also increases. - Answers modulation index
(MI), significant sidebands
