AMPLITUDE MODULATION AND FREQUENCY MODULATION - BASIC PRINCIPLES

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CanalTeleco

Published on May 26, 2023
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Adapted and dubbed by Juan Hernández Ruano, a student of Telecommunications Engineering at the Gandía Campus of the UPV. (EA5FUZ) There are a couple of misconceptions in the film. First, lightning does not disrupt the existing wave. However, it does complement the signal at the receiving antenna, just like any other noise, since noise has a very large bandwidth and therefore the tuned radio receives it at almost any frequency. Secondly, while talking about the benefits of FM, it is important to talk about its main drawback, which prevents it from being used in air navigation: While an AM signal that is disrupted by noise, static, or another signal might still be able to be received under fairly harsh conditions; the FM signal in the same situation will not even reach our ears in the first place. If two FM transmitters are tuned to the same frequency or their transmission bands cross, their frequencies will add or subtract due to the interference effect, with arbitrary phase shifts the discriminator will not even detect a signal, just noise at best. This is why FM is not used in aviation (for safety), for example using AM in any other situation where two aircraft want to transmit at the same time, the control tower will be able to hear both at once and organize communications, whereas with FM it is not. 02:43 Amplitude Modulation

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