direct wave


direct wave
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.
Direct and indirect waves.

Aviation dictionary. 2014.

Look at other dictionaries:

  • direct wave — tiesioginė banga statusas T sritis fizika atitikmenys: angl. direct wave vok. direkte Welle, f rus. прямая волна, f pranc. onde directe, f …   Fizikos terminų žodynas

  • direct wave — /dərɛkt ˈweɪv/ (say duhrekt wayv) noun → ground wave. Also, direct ray …   Australian English dictionary

  • Wave field synthesis — (WFS) is a spatial audio rendering technique, characterized by creation of virtual acoustic environments. It produces artificial wave fronts synthesized by a large number of individually driven speakers. Such wave fronts seem to originate from a… …   Wikipedia

  • Direct bonding — describes a wafer bonding process without any additional intermediate layers. The bonding process is based on chemical bonds between two surfaces of any material possible meeting numerous requirements.[1] These requirements are specified for the… …   Wikipedia

  • Direct digital synthesis — (DDS) is an electronic method for digitally creating arbitrary waveforms and frequencies from a single, fixed source frequency. OverviewA basic DDS circuit consists of an electronic controller, a random access memory, a frequency reference… …   Wikipedia

  • Direct to Disc — Studio album by FM Released 1978 …   Wikipedia

  • Wave Dragon — is a floating slack moored energy converter of the overtopping type, located in the northern Denmark. It was the world s first offshore wave energy converter. Wave Dragon is a joint EU research project, including partners from Austria, Denmark,… …   Wikipedia

  • Wave making resistance — is a form of drag that affects surface watercraft, such as boats and ships, and reflects the energy required to push the water out of the way of the hull. This energy goes into creating the wake.PhysicsFor small displacement hulls, such as… …   Wikipedia

  • Direct Cinema — is a documentary genre that originated between 1958 and 1962 in North America, principally in the Canadian province of Quebec and the United States. Similar in many respects to the cinéma vérité genre, it was characterized initially by filmmakers …   Wikipedia

  • Direct trade — is a form of sourcing practiced by some coffee roasters, referring to direct sourcing from farmers, with standards varying between producers.[1][2][3] Direct trade is seen as an alternative to Fairtrade certification,[4] and represents the… …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.