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question 6: Use below diagram to sketch and label the frequency spectrum of the baseband signal, the carrier signal and the AM signal.
8.4 Mixers 8.21* An AM signal is transmitted on an 800-kHz carrier. The baseband frequency range extends from 100 Hz to 5 kHz. This signal is to be detected by a superheterodyne receiver with a 55-kHz intermediate frequency. (a) What is the frequency of the local oscillator? (b) What must be the Q of the IF stages if the 1-dB points are to correspond to the maximum and minimum frequencies of the IF signal?
2. Question: A baseband signal has a bandwidth B = 10 kHz. The carrier frequency is ae = 2x 106 f the DSB-SC signal. T. Find the Nyquist frequency and Nyquist interval 0 of
-44 Q1): For the signal below, Sketch the AM modulated signal where: . u=1 Carrier = 4 cos(6000t) A Time |-1 t What is the problem with this modulated signal? 7 i B 1 FF T: III III C Activate Win
For the baseband signal m(t) = cos(1000πt) cos(3000πt), do the following. (a) Sketch the spectrum of m(t) (b) Sketch the spectrum of the DSB-SC signal m(t)cos(10, 000πt). (c) Identify the upper sideband (USB) and the lower sideband (LSB) spectra. (d) Identify the frequencies in the baseband, and the corresponding frequencies in the DSB-SC, USB and LSB spectra. Explain the nature of frequency shifting in each case.
Solve using Matlab: FM spectrum: A message signal m(t) (shown below) is used to modulate a carrier with frequency (fc) in a FM system with kr 90, find and plot the FM signal s(t) in both time and frequency domains. Use the value of fc-1000. m(t) (V) 3.5 t (ms) 250 [Note that m(t) is zero for t<0 and t>250 ms FM spectrum: A message signal m(t) (shown below) is used to modulate a carrier with frequency (fc) in a...
an expression nM() for an AM signal with a carrier frequency of 2 MHz that conveys a 1. (a) Write down sine wave message whose frequency is 2 peak-to-peak amplitude is 70 Volts. 500 Hz. The AM signal's modulation index is 0.75 and its (b) Compute the power efficiency n of this signal.
Power Spectrum of AM A baseband message signal is given byWn (t)-5 cos 2π 2500t + 4 cos 2π 5500. An AM waveform carrying this message g(t)-50[1 + μ m(t) mp]cos 2π5x 109, where mp s the peak value of m(t a) Plot (by hand) the power spectrum S (f) of the AM waveform g(t) with 0.6 (You can get help with this from the handout A Power Spectrum Primer. See the section "Finding the Power Spectrum of a Periodic...
10. The magnitude of the frequency spectrum of a signal X() is given below. The 6 dB bandwidth of the signal is a) 5 Hz b) 10 Hzc)15 Hz ) 20 Hz e) none above X() 1 40π 40T
A transmitter transmits an AM signal with a carrier frequency of 1305 kHz. When an inexpensive radio receiver (which has poor selectivity in the RF-stage bandpass filter) is tuned to 1305 kHz the signal is heard loud and clear. The same signal is also heard (not so loud) at another setting. At what frequencies except 1305 KHz you will hear this station. The IF frequency is 455 kHz.
When a baseband signal m(t) = cos(1000t)cos(3000t) is AM modulated using a carrier cos(10,000t), a) Find the frequency components in the baseband signals and in the AM signal. [2] b) Sketch the spectrum, carefully label the graph. c) Find the power efficiency, n. [1] [1]