Need of Modulation

Need of Modulation: Need of Modulation – Until the process of superimposing a low-frequency (long-wave) voice information component on a high-frequency (short-wave) carrier signal was perfected, the most widely used form of communications was a system based on the transmission of a continuous-wave (CW) signal. With this system, the signal was interrupted periodically (Morse code) […]

Communications Systems

Communications Systems: In a broad sense, the term Communications Systems refers to the sending, receiving and process­ing of information by electronic means. Communications started with wire telegraphy in the eighteen forties, developing with telephony some decades later and radio at the beginning of this century. Radio communication, made possible by the invention of the triode […]

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