在线词典

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.