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A [[Carrier wave|carrier]] and [[sideband]] (CSB), and [[Double-sideband suppressed-carrier transmission|sideband only]] (SBO) signal, transmitted from [[localizer]] and [[glidepath]] antennas produce a space-modulated signal resulting from the vectorial addition of two or more audio signals that vary according to position of the receiving aircraft.
The difference between the two modulation depths produce an error current signal in the airborne receiver. When an aircraft follows the course line, the difference between the two frequencies is zero.
This difference is conventionally displayed by the deflection of a moving coil indicator or needle
==See also==
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