DDM

DDM
Tags: Acronym
DDM is a FAA Acronym for: Difference in Depth of Modulation ...

The CDI has a full-scale deflection of 150 microamperes where the DDM equals 0.155 in both the 90 Hz and 150 Hz directions.

LOCALIZER COURSE [ICAO]- The locus of points, in any given horizontal plane, at which the DDM (difference in depth of modulation) is zero.