In a radio transmitter, the frequency swing is determined by the maximum deviation of the carrier frequency from its center frequency. The maximum deviation is set by the modulation index, which is a measure of how much the carrier frequency is modulated by the audio signal.
The frequency swing of a radio transmitter is important because it determines the bandwidth of the signal. The bandwidth is the range of frequencies that the signal occupies. The wider the bandwidth, the more spectrum space the signal takes up.
In order to minimize the amount of spectrum space that a radio transmitter takes up, it is important to keep the frequency swing as small as possible. However, the frequency swing must be large enough to allow for adequate modulation of the carrier frequency.
The frequency swing of a radio transmitter is also affected by the type of modulation that is used. For example, frequency modulation (FM) uses a wider frequency swing than amplitude modulation (AM). This is because FM is a more efficient modulation method and can provide better quality audio.
The frequency swing of a radio transmitter is an important parameter that affects the bandwidth and quality of the signal. By carefully selecting the modulation index, it is possible to achieve a good compromise between bandwidth and quality.