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- Near_vertical_incidence_skywave abstract "Near vertical incidence skywave, or NVIS, is a skywave radio-wave propagation path that provides usable signals in the range between groundwave and conventional skywave distances—usually 30–400 miles (50–650 km). It is used for military and paramilitary communications, broadcasting, especially in the tropics, and by radio amateurs. The radio waves travel near-vertically upwards into the ionosphere, where they are refracted back down and can be received within a circular region up to 650 km from the transmitter. If the frequency is too high (that is, above the critical frequency of the ionospheric F layer), refraction fails to occur and if it is too low, absorption in the ionospheric D layer may reduce the signal strength.There is no fundamental difference between NVIS and conventional skywave propagation; the practical distinction arises solely from different desirable radiation patterns of the antennas (near vertical for NVIS, near horizontal for conventional long-range skywave propagation).".
- Near_vertical_incidence_skywave thumbnail NVIS_ADH.JPG?width=300.
- Near_vertical_incidence_skywave wikiPageExternalLink nvis.htm.
- Near_vertical_incidence_skywave wikiPageExternalLink nvis.
- Near_vertical_incidence_skywave wikiPageExternalLink field_deployed_nvis.htm.
- Near_vertical_incidence_skywave wikiPageExternalLink nvis3.htm.
- Near_vertical_incidence_skywave wikiPageExternalLink nvis_n_v_i_s_antenna.htm.
- Near_vertical_incidence_skywave wikiPageID "2860618".
- Near_vertical_incidence_skywave wikiPageRevisionID "605025580".
- Near_vertical_incidence_skywave subject Category:Ionosphere.
- Near_vertical_incidence_skywave subject Category:Radio_frequency_antenna_types.
- Near_vertical_incidence_skywave subject Category:Radio_frequency_propagation.
- Near_vertical_incidence_skywave comment "Near vertical incidence skywave, or NVIS, is a skywave radio-wave propagation path that provides usable signals in the range between groundwave and conventional skywave distances—usually 30–400 miles (50–650 km). It is used for military and paramilitary communications, broadcasting, especially in the tropics, and by radio amateurs.".
- Near_vertical_incidence_skywave label "NVIS".
- Near_vertical_incidence_skywave label "NVIS".
- Near_vertical_incidence_skywave label "Near Vertical Incidence Skywave".
- Near_vertical_incidence_skywave label "Near vertical incidence skywave".
- Near_vertical_incidence_skywave sameAs NVIS.
- Near_vertical_incidence_skywave sameAs NVIS.
- Near_vertical_incidence_skywave sameAs Near_Vertical_Incidence_Skywave.
- Near_vertical_incidence_skywave sameAs m.087f0s.
- Near_vertical_incidence_skywave sameAs Q751590.
- Near_vertical_incidence_skywave sameAs Q751590.
- Near_vertical_incidence_skywave wasDerivedFrom Near_vertical_incidence_skywave?oldid=605025580.
- Near_vertical_incidence_skywave depiction NVIS_ADH.JPG.
- Near_vertical_incidence_skywave isPrimaryTopicOf Near_vertical_incidence_skywave.