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What is FM Modulation?

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What is FM Modulation?

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FM is the abbreviation for Frequency Modulation, which is the method of transmitting information by modulating a carrier frequency on a radio transmitter. The frequency of the carrier wave is varied in accordance with the amplitude of the input signal, while the amplitude of the carrier remains unchanged. What is the difference between Squelch and Mute? Nothing; the output of a receiver is muted by a squelch circuit when the received signal falls too low for reception. Some units have preset mute levels, others have manual settings. It should be set so that the receiver mutes when the transmitter is switched off, or goes out of range, before the signal is swamped with noise or interference. To achieve the optimum setting, place the transmitter at a distance so that the receiver shows the carrier at about half strength. It may help to remove the antenna from the transmitter. Set the squelch control to maximum (ie muted) and then back it off until noise starts to appear. Then trim it bac

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