This effect is used to good advantage for automatic frequency control in receivers, and in frequency modulation for transmitters.
2.
They also installed a new 1000 watt transmitter with automatic frequency control and new speech amplifiers at their plant in Coytesville NJ . These upgrades improved the range and sound quality of their broadcast.
3.
However the resonant frequency of a tuned circuit is not very stable; variations in temperature and aging of components caused frequency drift . Automatic frequency control ( AFC ) solves some of the drift problem, but manual retuning was often necessary.
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