3.1 An AM signal has a carrier frequency of 100 kHz and a modulating signal of 5 kHz. Calculate the sideband frequencies.
6.1 A transmission line has a characteristic impedance of 50 Ω and a length of 100 m. Calculate the propagation constant.
2.1 Find the Fourier transform of a rectangular pulse.
Δf = k_f * A_m
1.2 What are the advantages of using electronic communication systems?
Coherent digital modulation uses a reference carrier signal at the receiver to detect the transmitted signal, while noncoherent digital modulation does not use a reference carrier signal.