Edwin armstrong6/1/2023 ![]() To hold this & other stations following a band of frequencies among 42 MHz & 50 MHz frequencies. Immediately, he approached Radio Corporation of America or RCA, they were impressed by his ideas, but RCA was simply focusing on TV, so they don’t want to redirect any resource to a new type of broadcasting.Īfter many troubles, he launched a radio station in the year 1939 to exhibit the efficiency of FM. But, for different reasons, his ideas don’t accept by others. In 1928, he simply started to expand the idea with the help of FM & he increased the BW instead of decreasing it. Edwin Armstrong was an American engineer, so he examining this problem & whether FM, rather than AM might give a benefit. So in this method, less noise was received through the receiver. FM HistoryĪt the time of radio, the static was the main problem &the way everybody attempted to decrease the static effects was to decrease the bandwidth. For instance, once the frequency variation is 3 kHz up & down, then it is signified like ☓ kHz. So this frequency change can be represented in kHz (kilohertz). This signal is more essential because the frequency of this signal will flow up & down depending on the amplitude of the signal. ![]() The modulation of these signals will result in an FM modulated signal. The message signal holds the specific data whereas the next signal has no data known as the carrier signal. The frequency modulation block diagram is shown below. The figure shows the frequency of the FM wave when the input is at its max, 0V, and at its min. The frequency of the carrier will be at its normal value (free-running) fc when the input signal value is 0V. The carrier deviates minimum from its normal value. The carrier frequency will be minimum (fc min) when the input signal is at its lowest.
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