Frequency modulation lab manual pdf

FSK - frequency shift keying D1 - 61 Conceptually, and in fact, the transmitter could consist of two oscillators (on frequencies f1 and f2), with only one being connected to the output at any one time. This is shown in block diagram form in Figure 2 below. analog modulation, and four on digital modulation. The four basic experiments cover introduction to the laboratory equipment, simulation of communication systems using MATLAB, time- and frequency-domain representation of signals, and processing of speech signals. The analog modulation part covers the generation and detection of Double-Side. Notice that the modulation index changes a lot with the modulation frequency (from 2, to 5). For the 15 KHz signal, mf = 5 and from Table 1, we see that the frequency components are up high up to J6 and drop quickly afterwards. This means that the bandwidth of the signal is 6x15 KHz = 90 KHz on each side of the center frequency (a.

Where Modulation (0) is the maximum modulation of the system. Method In this lab, you will: 1. Calculate the Modulation Transfer Function by scanning a Line Pair phantom. 2. Plot the relative modulation as a function of spatial frequency (line pairs/mm). 3. oscilloscope and the low-frequency spectrum analyzer to confirm your prelab studies into the shape and form of AM waves. 1. Set Channel A to output an AM signal with fc=30kHz, Vc=1V fm=1kHz, and m= 2. Observe the results on the scope and spectrum analyzer , 75, and percent modulation (sketch roughly in lab notebook). 3. value of the generated signal {mp}, and modulation index {mu} as inputs. Use ^Array Max and Min _ VI ~Fig. 47) to get the maximum value of the generated signal, and the ^Modulation Index _ control provided to set the modulation index {mu}. Use equations (23), (24), and (25) to set up the text-based script to get the baseband signal {b.

). Measure amplitude and frequency of the carrier signal. To obtain carrier signal of desired frequency, find value of R from f=1/ (2πRC) taking C=pF. 3. Apply the sinusoidal modulating signal of frequency 4 KHz and amplitude 3V p-p at pin no. 7. (pin no. 5 for IC) Now slowly increase the amplitude of modulating signal and measure f min. ANALOG COMMUNICATION LAB (04 1x03) LABORATORY MANUAL Analysis of the process of Frequency Division Multiplexing and demultiplexing. Modulation is defined as. 1. Amplitude modulation: Modulation is a process of translating information signal from low band frequency to high band frequency that is suits the transmission medium. Information signal is usually of low frequency, so it cannot travel far. It needs a carrier signal of higher frequency for long distance destination.