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WorksheetsAdvanced Modulation
Total questions: 25
Worksheet time: 14mins
What type of PSK is this signal?
QPSK
BPSK
8PSK
4PSK
The difference between two adjacent frequency levels, measured in Hertz (Hz)
Shift
Excursion
FSK
ASK
PSK
QAM is a mixture of:
AM & FM
FM & PM
AM & PM
AM & CW
What is the missing name?
Variation
Midpoint
Centre frequency
Deviation
What is the bit rate of the signal when the signal changes 30 times per second?
30
60
90
120
How many bits per element is there on an MFSK signal
1
2
4
8
Digital modulation consists of:
ASK, FSK, PSK, FM, AM
FM, AM
None of the above
Define modulation
Modulation is the process of converting signals into data waves and extracting the information.
Varying the characteristics of a signal using the characteristics of another signal.
Modulation is the process of changing from FM to AM and vice versa.
Modulation is the process of moving a signal under the noise floor to hide the signal.
MSK has a (Blank) dB drop off
23
32
12
25
If 4MFSK covered 4MHz from 9MHz to 13MHz what would the centre frequency be?
10MHz
11MHz
12MHz
11.5MHz
The Data rate is dependant upon the Modulation Rate, and the binary allocated to each signalling event.
True
False
There are 3 mains types of Digital signals. ASK is one, what are the other two?
FSK
GSK
DSSS
PSK
What signal does this represent
FSK
PSK
OOK
ASK
What is shift measured in?
kHz
Hz
MHz
A signal changes 100 times in 2 seconds and has an 3 bits per signal.
What is its bit rate of this signal?
100
50
150
8
4
How many bits per element are used on a 8MFSK signal?
4
2
3
8
There are various characteristics of a sine wave that can be changed. Select all that apply.
Frequency
Tone
Amplitude
Phase
Noise
How do you calculate bandwidth in a FSK signal?
Baud + deviation
Baud x signalling events
Shift + baud
Shift + Bit rate
How many frequencies are there in a FSK signal?
1
2
4
8
How many phase changes are there in a BPSK signal?
1
2
4
8
What is the difference between MSK and FSK?
MSK is less efficient
MSK is more efficient
MSK is the same as FSK
FSK is more efficient
What are the two variations of a QAM signal?
Frequency
Amplitude
Phase
True or False?
OOK is more susceptible to noise as when it is in an off state it could be recognised as on due to background noise.
True
False
Fill in the blank
MFSK - Within FSK the Data Rate can be increased without increasing the ________. This done by increasing the number of frequencies used.
Baud rate
Bit rate
