direct wave

[də¦rekt ′wāv] (communications) A radio wave that is propagated directly through space from transmitter to receiver without being refracted by the ionosphere.

direct wave

Direct and indirect waves.An electromagnetic wave that travels directly from a transmitting antenna to the receiving antenna along a straight line. Direct waves are responsible for part, but not all, of the signal propagation between two antennae when a sight line connecting the antennae lies above the ground. The surface (ground) wave and the reflected wave also contribute to the overall signal at the receiving antenna. Also called a line-of-sight wave or a space wave, it is prevalent in frequencies above 30 MHz.

单词	direct wave
释义	direct wave direct wave [də¦rekt ′wāv] (communications) A radio wave that is propagated directly through space from transmitter to receiver without being refracted by the ionosphere. direct wave Direct and indirect waves.An electromagnetic wave that travels directly from a transmitting antenna to the receiving antenna along a straight line. Direct waves are responsible for part, but not all, of the signal propagation between two antennae when a sight line connecting the antennae lies above the ground. The surface (ground) wave and the reflected wave also contribute to the overall signal at the receiving antenna. Also called a line-of-sight wave or a space wave, it is prevalent in frequencies above 30 MHz.
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