Radio history
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The document summarizes the history and development of radio technology over time. It discusses some of the key figures who contributed discoveries and inventions, such as Michael Faraday, James Clerk Maxwell, Heinrich Hertz, and Edwin Armstrong. It also outlines the establishment of early radio networks and stations in the 1920s, as well as the founding of the BBC in 1922.
Radio history
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- 2. l誰狸hla f.a ixfoaYhla tla ;ekl isg ;j;a ;eklg he炭h yelafla flfiao hkak ms<snj fidhd .ekSu;a iu .=jka jka 炭耽,s udOHfha b;sydih wdr誰N f探臓 f探臓 17 jk ishjfia is叩hd hehs ms<s.efkk yshqcskaia (Hugens) Hugens) rx. keue;s mqoa.,hd tla;rd kHdhla wkqj wdf,dal ;rx. ud,djla wjldYhg fhduq lsfuka miq th .=re fldg f.k tla ;ekl isg ;j;a ;eklg ixfoaYhla he炭h yels nj fidhd .kakd ,則臓 fulS isoaOdka;h mok誰 lr .ks単ka uhsl,a *erf但 (Michael Faraday 炭iska 炭袖q;a pq誰Nl w;ayod ne,S誰 is耽 lf<ah臓 Faraday) 1873 則 fc誰ia la,d他la uelaiaf探,a (Jemes Clerk Maxwell th Maxwell) .Ks;uh isoaOdka;hla njg m;a lf<ah臓 (C)Prarthana Weerasinghe 11/01/2011
- 4. 1988 oS uelaiaf探,af.a kHdh Wmfhda.S lr .ks単ka c他udkq cd;sl 炭袖d{ 炭袖d{ fykala y他ia (Heinrich Hertz) 炭iska 炭袖q;a pq誰Nl ;rx. ksIamdokh fldg tajdfha ;rx. wdhduhka uksk ,則臓 rx. rx. (C)Prarthana Weerasinghe 11/01/2011
- 5. y他iaf.a fidhd .ekS誰j,g .re lsula jYfhka .=jka 炭耽,s ;rx. ixLHd;h m%ldY lsf誰 cd;Hka;r m%単;sh 賊la湛u iyd Tyqf.a ku fl叩 lr Hz f,i Nd炭;d lr ;sf鱈臓 1897 oS 炭,sh誰 larEia (William Crooks) keue;a;d m<uq jrg 炭袖q;a pq誰Nl ;rx. u.ska ix{d he炭h yels nj fmkajd foa臓 .=jka 炭耽,s hka;%h fidhd .ekSf誰 f.!rjh ys単 jkafka b;d,s cd;sl .=.a,sfuda ud他fldaks gh臓 Tyq /yeka rys;j ix{d he炭h yels nj fidhd .;a w;r Dot & Dash fyj;a ;s;a iy b u.ska ikaksf探ok lghq;= is耽jk /yeka rys; fg,s .d%*a l%uh b;d,s rchg yqkajd oqkafka h臓 (C)Prarthana Weerasinghe 11/01/2011
- 7. 1897 uehs 20 fjksod ud他fldaks Wireless Signaling Company k単ka iud.ula msysgq湛 h臓 fuu iud.f誰 uQ,sl wruqK jQfha ikaksf探ok lghq;= iyd jh他,ia WmlrK ksmo湛uhs臓 1912 則 w;a,dka;sla id.rfha .uka .ks単ka ;snQ Titanic fk!ldj ihqf他 md湛 wd whsia l=叩hl yemS .sf,kakg jQ fudfydf;a tys is叩 u.Skag wdOdr b,a,d is叩fha ud他fldaks ikaksf探ok WmlrK Nd炭;fhks臓 Titanic is耽湛u;a iu. jh他,ia ikaksf探okh ms<sn| uOH wjOdkh fhduq jkakg 炭h臓 f,dalfha m<uq f,dal .=jka 炭耽,s uOHia:dkh wdr誰N jQfha 1920 fkdje誰n他 20 fjksod h臓 th KDKA k単ka wdr誰N 炭h bka miq Radio Network ^.=jka 炭耽,s cd,d& wdr誰N 炭h 1922 BBC 1935 則 Edwin H. Armstrong 炭iska AM ;rx. fjkqjg FM (Frequency Modulation) fyj;a ixLHd; uQ他ck yqkajd foa臓 (C)Prarthana Weerasinghe 11/01/2011
- 8. ;rx. moaO;s rx. moaO;s kduh ixLHd; ixLHd; mrdih 01 ixLHd; b;d my;a ixLHd; 3KHz 30 KHz Very Low Frequency (VLF) 02 my;a ixLHd; ixLHd; 30KHz- 300KHz 30 Low Frequency (LF) 03 uOHu ixLHd; 300KHz -3000KHz Medium Frequency (LF) 04 Wp ixLHd; 3MHz-30MHz High Frequency (HF) 05 b;d Wp ixLHd; 30MHz- 300MHz Very High Frequency (VHF) 06 w;s Wp ixLHd; 300MHz- 3000MHz Ultra High Frequency (UHF) 07 iqms w棚 Wp ixLHd; 3GHz- 30GHz Supper High Frequency (SHF) 08 ixLHd; mru Wp ixLHd; 30GHz- 300GHz Extremely High Frequency (EHF) (C)Prarthana Weerasinghe 11/01/2011