abstract:In a radio receiver, a bandspread control is a secondary tuning control that allows accurate tuning of closely spaced frequencies of a radio band.Band spreading, IEEE Standard 100 Dictionary of Standards Terms, pg 94 With a main tuning control that covered a wide range of frequencies, for example 10-14 megahertz in a few turns of the tuning knob, a very small motion might chang the tuning by tens of kilohertz and would make accurate tuning to any given frequency difficult.
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an additional tuning control in some radio receivers whereby a selected narrow band of frequencies can be spread over a wider frequency band, in order to give finer control of tuning 波段展开; 将窄段频率扩展成宽段的收音调频技术