If the power is provided by stand-alone generators, then the frequency deviation could be much wider, perhaps several Hz . Outlet power or even the power on the utility feeders also contains harmonic multiples of the mains frequency, the amount varying greatly depending on transformer balancing and the loads customers have connected . talk ) 17 : 32, 24 February 2009 ( UTC)
32.
A varactor, a diode with capacitance depending on applied voltage, is often used in voltage-controlled crystal oscillators, VCXO . The crystal cuts are usually AT or rarely SC, and operate in fundamental mode; the amount of available frequency deviation is inversely proportional to the square of the overtone number, so a third overtone has only one-ninth of the pullability of the fundamental mode.
33.
:Probably very little; most systems with sensitive electronics use a power supply and convert the AC to DC . Those converters often use a filling ( or holding ) capacitor, and since 50 and 60 Hz are fairly close anyway, the capacitor will effectively convert to DC . A few AC items such as motors might possibly be sensitive to the frequency deviation, so you should check tolerances for particular devices.
34.
While wideband FM uses more bandwidth, it can improve the signal-to-noise ratio significantly; for example, doubling the value of \ Delta { } f \,, while keeping f _ m constant, results in an eight-fold improvement in the signal-to-noise ratio . ( Compare this with Chirp spread spectrum, which uses extremely wide frequency deviations to achieve processing gains comparable to traditional, better-known spread-spectrum modes ).
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