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.
For the standard atmosphere, the effective Earth radius is 4/3 that of the actual Earth radius. The ratio of the effective Earth radius to the actual Earth radius is called the k factor.
Famous quotes containing the words effective and/or earth:
“Watteau is no less an artist for having painted a fascia board while Sainsbury’s is no less effective a business for producing advertisements which entertain and educate instead of condescending and exploiting.”
—Stephen Bayley (b. 1951)
“There is not much sense in suffering, since drugs can be given for pain, itching, and other discomforts. The belief has long died that suffering here on earth will be rewarded in heaven. Suffering has lost its meaning.”
—Elisabeth Kübler-Ross (b. 1926)