effective earth radius

In telecommunication, effective Earth radius is the radius of a hypothetical Earth for which the distance to the radio horizon, assuming rectilinear propagation, is the same as that for the actual Earth with an assumed uniform vertical gradient of atmospheric refractive index. Note: For the standard atmosphere, the effective Earth radius is 4/3 that of the actual Earth radius. Source: from Federal Standard 1037C and from MIL-STD-188 Radius, effective

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distributed database
distributed queue dual bus
distributed switching
disturbance voltage
diurnal phase shift
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
earth terminal complex
echo (mythology)
effective data transfer rate
effective height
effective input noise temperature
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effective transmission rate
efficiency factor
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electrical length
electric field
electromagnetic compatibility
electromagnetic environment
electromagnetic interference control
electromagnetic pulse
electromagnetic radiation hazard
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electronic deception
electronic switching system
electronic warfare support measures