diurnal phase shift

In telecommunication, diurnal phase shift is the phase shift of electromagnetic signals associated with daily changes in the ionosphere. The major changes usually occur during the period of time when sunrise or sunset is present at critical points along the path. Significant phase shifts may occur on paths wherein a reflection area of the path is subject to a large tidal range. In cable systems, significant phase shifts can be occasioned by diurnal temperature variance.

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differential encoding
differential manchester encoding
diffraction grating
digital access and cross connect system
digital filter
digital milliwatt
digital multiplex hierarchy
digital signal 0
digital subscriber line
digital transmission group
digitizer

digroup
direct access
direct connect
direct distance dialing
directional coupler
directive gain
direct sequence spread spectrum
disengagement originator
dispersion limited operation
distortion
distortion limited operation

distributed database
distributed queue dual bus
distributed switching
disturbance voltage
diversity reception
dod master clock
double ended synchronization
double sideband reduced carrier transmission
double sideband suppressed carrier transmission
doubly clad fiber
d region

drift
drop (liquid)
drop and insert
dropout
dual access
dual in line package
duct
duobinary signal
duplexer
duty cycle
dynamic range