WorksheetsElectronic Communication System | modulation & bandwidth
Total questions: 7
Worksheet time: 4mins
AM modulators are nonlinear devices with 4 inputs and 1 output.
True
False
The list below are the facts of ideal modulation (m=1), EXCEPT
The original shape of the signal is destroyed and causes distortion.
Maximum info signal amplitude is transmitted.
Hard to achieve especially when the modulating signal amplitude varies randomly over a wide range.
Produce the greatest output at the receiver without distortion.
Calculate the modulation index if the carrier signal voltage is 12 V and modulating signal voltage is 4 V.
0.33
3
48
0.66
One way to improve sensitivity is by reducing the bandwidth of the AM receiver.
True
False
Determine the bandwidth of the AM double sideband suppressed carrier if the carrier frequency is 50 kHz, the modulating signal (information signal) frequency is 7 kHz, and the input bit rate of 3 kbps
7 kHz
14 kHz
57 kHz
43 kHz
Information capacity is a measure of how much information can be propagated through a communication system and is a function of bandwidth and transmission time.
True
False
Amplitude and phase-shift keying are combined in such a way that the position of the signaling elements on the constellation diagrams is optimized to achieve the greatest distance between elements.
APSK
QAM
FSK
MIMO
