Broadcasting in America: A Survey of Electronic MediaHoughton Mifflin, 1987 - 604 páginas |
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Página 141
... waves encounter affect the dis- tance they travel and hence the shapes of cov- erage areas . Conditions influencing coverage patterns include weather , physical obstruc- tions ... Waves, 8 4 Edwin Armstrong (1890-1954) 78 Wave Propagation.
... waves encounter affect the dis- tance they travel and hence the shapes of cov- erage areas . Conditions influencing coverage patterns include weather , physical obstruc- tions ... Waves, 8 4 Edwin Armstrong (1890-1954) 78 Wave Propagation.
Página 142
... Wave Propagation Antenna Line of sight to horizon Antenna Line of sight to horizon Ground wave Direct waves travel like light rays , straight out from small radiating elements atop the antenna structure . The line - of - sight angle to ...
... Wave Propagation Antenna Line of sight to horizon Antenna Line of sight to horizon Ground wave Direct waves travel like light rays , straight out from small radiating elements atop the antenna structure . The line - of - sight angle to ...
Página 149
... waves that have length , frequency , amplitude , phase , and velocity . These waves are subject to attenuation , refraction , reflec- tion , absorption , interference , and sometimes ducting . It is essential , however , to realize that ...
... waves that have length , frequency , amplitude , phase , and velocity . These waves are subject to attenuation , refraction , reflec- tion , absorption , interference , and sometimes ducting . It is essential , however , to realize that ...
Términos y frases comunes
A. C. Nielsen advertising affiliates agencies Amendment American antenna appeal applications Arbitron AT&T audience began broad broadcast and cable broadcast stations cable networks cable systems cable television carrier wave channels cial commercial commission communications act Congress cost court coverage decision effect electronic media entertainment example Exhibit fairness doctrine FCC's federal film formats frequency grams groups households impact industry issues license limited LPTV major Mass Media ment million Nielsen noncommercial operation ownership pay cable percent political prime-time produced programs public broadcasting radio and television radio stations ratings receivers recording regulation relay renewal reports role rules sample satellite schedule shows signals sion SMATV Source spectrum standards subscribers syndicated tele Telecommunications telephone teletext television networks television stations tion tional TVRO viewers waves wireless