Gelombang Radio Gelombang Televisi Gelombang Radar

204 Mudah dan Aktif Belajar Fisika untuk Kelas X

a. Sistem AM Amplitudo Modulasi

5?=2172DG925A6A5;D5B9A54184921F1?5875?=217A149? G1725A6A5;D5B9C97791;5C75?=217C5AB52DC49131A;1=51D9 75?=217A149?B5217195AD21811=9CD4?5?=217A149?=5=99;9 1=9CD4? G17 25A25412541 B5BD19 4571 75?=217 2DG9 G17 4921F1G1 4571 6A5;D5B9 75?=217 A149?G1 C5C1 ?4D1B9 1=9CD4?141131A1A149?49D;9B;1141-1 5?=217BD1A1G174921F1?5875?=217A149?B5217191;921C 5AD21811=9CD4?411C4571=D418491CD;1?5819B19??B65A G19CD19B117;1B1G17=5714D7=D1C19BCA9;131A1A149? 411C=5:17;1DC5=1CC5=1CG17:1D81CD175?=217A1 49?14119B19??B65A495A981C;1141-1 b. Sistem FM Frekuensi Modulasi 5?=2172DG94921F1?5875?=21755;CA?=175C9;411= 25CD; =?4D1B9 6A5;D5B9 49 =11 6A5;D5B9G1 25AD218D218 41 1=9CD4?G1 C5C1 9BC5= 99 =5=99;9 ;55=181 G1;9 :1A1; :17;1D1G1G17C5A21C1BB5212BD;1A491CD;1?4D1B96A5;D5B9 1415=131AA149?49D;9B;1141-1 9BC5==5=99;9;D19C1BBD1A1G17219;412521B41A99C5A65A5B9 G17=5ADB1;B9G1B9G16A5;D5B975?=217C5C19=D418=5711=97177D 1;59BCA9;149D41A141C941;411C491CD;1?5819B19??B65A 58;1A5175?=217C941;411C491CD;1?5819B1 9??B65A 1;921CG1 75?=217 99 C941; 411C =53119 C5=1C C5=1CG17:1D858B52129CD492DCD8;1BC1B9DBC1B9D578D2D7 A519G17411C=5=131A;1;5=21975?=21775?=217G17 49C5A9=1G1171A:1A1;:17;1D1G1B5=1;9=5D1BC1B9DBC1B9D 578D2D7C5AB52DC49D;9B;1141-1 Gambar 9.3 Pantulan gelombang radio oleh ionosfer. Gambar 9.4 Modulasi frekuensi pada radio pemancar FM. Bumi gelombang radio ionosfer Gambar 9.2 Modulasi amplitudo pada pancaran radio AM. 411BC9=575C18D9A149?41A149?2D;15AB1=1;5?=?;251:1A 4131A91896?A=1B9=5751911G1749=1;BD4A149?41A149?1 5A25411491C1A1;54D1G14121719=11:17;1D16A5;D5B9;54D1:59B A149?C5AB52DC 9;1495AD;125A;D:D718;5B118B1CDBC1B9D49415A1841 D1C181?A141A9;5791C19941;D=D;1CD71BC5AB52DC;51417DAD41 Mari Mencari Tahu Gambar 9.5 Untuk mengirimkan gelombang FM diperlukan antena pemancar.

B. Jenis-Jenis Gelombang Elektromagnetik

1. Gelombang Radio

5?=217A149?=5AD1;175?=21755;CA?=175C9;41=5A1=21C 4571;5351C13181G1G19CDL =B5?=217A149?=5=99;9 415A186A5;D5B91C1A1 HB1=19 H41497D1;1B52171911C ;?=D9;1B91C1D5=21F196?A=1B941A9BD1CDC5=1C;5C5=1C19 961C75?=217A149?=D418491CD;1?5819B19??B65AD=9 B58977175?=217A149?411C=53119C5=1CC5=1C49D=9G17 :1A1;G1B171C:1D841A95=131AA149? 5?=217A149?497D1;1411=B9BC5=5=2931A11:1A1;:1D8G17 C941; =577D1;1 ;1F1C 5781C1A 5?=217 55;CA?=175C9; 25AC941;B5217195=21F175?=2171D49?BD1A1414D1=131= 31A1DCD;=5=21F175?=2172DG9;555A9=1G1G19CD4571B9BC5= 1=9CD4?=?4D1B941B9BC5=6A5;D5B9=?4D1B941 Di unduh dari : Bukupaket.com 205 Gelombang Elektromagnetik

2. Gelombang Televisi

5?=217C55E9B9=5=99;96A5;D5B9G175298C977941A9141 75?=217 A149? 5?=217 99 =5A1=21C DADB 41 C941; 411C 491CD;1?5819B119B11C=?B65AD=95?=217=9;A?G17 497D1;1 DCD; B91A1 C55E9B9 81G1 411C 49C5A9=1 ?58 5B1F1C 55A9=1:9;175?=217C5AB52DCC941;C5A811741A95=131AG11 9949;1A51;175?=217C55E9B9C941;411C=55F1C957;D71 57;D71 1C1D 5A=D;11 C9779 A5418G1 A5956 D=9 +CD; =571C1B9819CD:9;175?=217C5A8117?58B52D187DD7=1;149 D31;7DD71C1D49;1;97DD79CD1;1491B17B52D18BC1B9DA519 41DDCD;;?=D9;1B9:1A1;:1D8491B17B1C59C2D1C1141 ;5C97791C5AC5CD41A9D=91C59C411C497D1;1B521719BC1B9D A519DCD;B91A1C55E9B9A149?C55?C557A14119B521719G1 D7B9BC1B9DA51914118DCD;=55A9=175?=21755;CA?=175C9; 41A9BC1B9D5=131A;5=D491=5=131A;175?=2179CD;5415A18 B525A17G1

3. Gelombang Radar

141AB97;1C141A914118C5A=1BD; B118B1CD75?=21755;CA?=175C9;45716A5;D5B9B5;9C1A 85ACH C51A141A411C25A6D7B9B5217195=131A4155A9=175?=217 131A175?=217A141AC5A1A18411=25CD;DB1411=B517F1;CD C5AC5CD 9;1DB1C5AB52DC=57519B1B1A1=9B1G15B1F1CC5A217 1;1141DB11CDG17B5217911;149C5A9=1;5=219?581C51 A141A 9;1B517F1;CD1C1A1131A14155A9=1114118 t 41 ;5351C15A1=21C175?=217A141A49G1C1;14571:1A1;B1B1A1 ;5A141A411C49C5CD;1B52171925A9;DC 519=545C5;B9?2:5;B55AC95B1F1CC5A217494?5B91A141A 497D1;1 DCD; 571=1C1 3D131 B55AC9 G17 49=99;9 5=217155A217141C1A9;B11B9?191C1A1G1 =5=99;9141AC=?B65A81CD9BC9F11C1D G1725A14149;5C97791;DA175298 =491C1B5A=D;11 1DC49?C?C1217D=1CA11A1CB55AC914171=21A -1 141AC5AB52DC49A1317B118B1CDG1DCD;=5=1C1D1A18;5351C1 17941CDA2D5B9B531A1 B545A8111A1;5A:1A141A=579A9=;1 B9G1DB175?=217;5D41A15=D4911AC9;51AC9;55=25CD; 3D131=5=1CD;1;5=219B9G14149C5A9=1?5855A9=175?=217 411=A141AC5AB52DC 4. Sinar Inframerah 1491B996A1=5A18=59DC96A5;D5B9 K HA5;D5B999411C 4981B9;1?5875C1A11C?=1C?=411=21815C1A11C?=1C?=141 BD1CD=?5;D411C:D71=5=131A;175?=21755;CA?=175C9;141 6A5;D5B96A5;D5B9G17;81B411=415A1896A1=5A185;CA?B;?9 96A1=5A18=5AD1;1B118B1CD11CG175C97DCD;=5=51:1A9 BCAD;CDA=?5;D9B1=979CD4571=577D1;11C1C?CA5C G175;1C5A814175?=21796A1=5A185B1F1CD41A1G17C5A217 K Gambar 9.7 Radar Atmosfer Khatulistiwa atau Equatorial Atmosphere Radar EAR Sumber: www.lapan.go.id satelit penerima pemancar Gambar 9.6 Gelombang televisi dipancarkan dan disebarluaskan melalui satelit. Di unduh dari : Bukupaket.com 206 Mudah dan Aktif Belajar Fisika untuk Kelas X C97791C1DDB1C59CB1C59C49D1A17;1B1411C=5=2D1C?CA5C?CA5C 5A=D;112D=94571=5=5A7D1;175?=21796A1=5A18

5. Sinar Tampak