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Line 5: A [[Carrier]] and [[Sideband]] CSB, and Sideband Only [[Double-sideband_suppressed-carrier_transmission\|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 ~~coureline~~courseline, the difference between the two frequencies is zero percent (0%). The DDM for a Localizer at the outer extremity of the course sector is 15.5% or a current equivalent of 150 microAmperes. This difference is traditionally displayed by the deflection of a moving coil indicator or needle/s on an instrument known as an [[horizontal situation indicator]], HSI. ==See also==

Difference in the depth of modulation: Difference between revisions