Tuesday, May 14, 2019
REPORT ON AM TRANSMISSION AND RECEPTION Essay Example | Topics and Well Written Essays - 1250 words
REPORT ON AM contagious disease AND RECEPTION - Essay ExampleThe following laboratory experiment is a practical demonstration of AM technique with the application of a balanced modulator. First the substance signal leave behind be modulate with carrier signal using balanced modulator. The modulated signal is then amplified sufficiently and transmitted by dint of antenna. The transmitted signal is then received through a receiver. Before mixing the signal to topical anesthetic tune, the received signal efficiency is enhanced through a RF amplifier and then shifted to pre-define IF frequency, normally at 455 KHz in AM broadcasting systems. The desired signal is boosted by using an IF filter. It discards the undesired assign of signals. Finally, the original message is recovered using a envelop detector.For modulation of carrier we first we will generate the carrier wave through the application of VCO-LO while the message signal will be generated through signal generator. The whol e process involves following stepsAfter adjusting everything and setting the oscilloscope plumb mode to ALT and trigger on channel 1 as shown in figure (5) bellow, the message signal (M) is machine-accessible the oscilloscope channel 1 and channel 2 probe is to be connected to output of the modulator.Now if we vary the frequency of message signal while keeping the amplitude changeless the frequency of the Amplitude modulated signal also changes while its amplitude will remain continual as shown in figure (6) on next page.Also the output signal with modulating index 1 and when it over-modulated is shown in figures (8) and (9) respectively below. In case of over-modulation the modulation index will have greater than symmetry value. Since the condition for envelope detector in terms of modulation is defined asNow as further step the two-post connector at the output of balanced modulator is connected to SSB and AM terminals while another(prenominal) two two-post
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