
80 meterla byaand

80-meater ledhaa 3.5-MHz byaand anedi autsaahika radeo upayogam kosam ketaayinchina radeo pounahpunyaala byaand, idhi iu praantam 2 (ekkuvagaa uttara mariyu dakshina americatho koodi untundi) loe 3.5 nundi 4.0 MHz varaku, mariyu saadhaaranamgaa 1 mariyu 3 praantaalalo (migilina prapancha) varusaga 3.5 nundi 3.8 ledhaa 3.9 MHz varaku untundi. saadhaaranamgaa phone (vois) kosam upayoginche byaand yokka eguva bhaganni konnisaarlu 75 meterlugaa suuchistaaru. airopalo, 75 mea anedi short wave broadcast byaand, aneka jaateeya radeo sevalu 3.9 mariyu 4 emhechz madhya panicheestaayi.
suuryaastamayam varaku konasage adhika dii pora shoshana kaaranamgaa, 80 meterlu saadhaaranamgaa pagatipuuta sthaanika samachara maarpidiki matrame manchidi, mariyu pagatipuuta khandantara dooraalaku samachara maarpidiki eppuduu manchidi kaadu. conny madhyahnam nundi raatri gantala varaku praantiiya communication netvarklaku idhi atyanta prajaadarana pondina byaand. vaataavarana mariyu ayano aavarana paristhitulanu batti, raatri samayamlo, 200 maillu/300 kimmy lopala sthaanika parichayala nundi 1,000 maillu/1,600 kimmy ledhaa anthakante ekkuva dhooram-prapanchavyaaptamgaa kooda-sagatu dhooraalatho, raatri samayamlo, "80" saadhaaranamgaa takkuva nundi madhya dhooram parichayaalaku nammadaginadi.
saaraamsam.
80 meterla byaand 500 maillu/800 kimmy paridhiloo autsaahikula madhya ragchevlaku anukuulamgaa untundi. pootiila samayamlo byaand suuryaastamayaaniki mundu praarambhamai raatrantaa konasage kaaryakalaapaalato nindi untundi. 80 meterla byaand 3.5 mhz vadda praarambhamai 4.0 mhz varaku velutundi. byaand yokka eguva bhaganni, ekkuvagaa vois kosam upayogistaaru, tarachugaa 75 meterlu anie pilustaaru, endukante tarangadairghyam 80 mariyu 75 meterla madhya untundi.
eee frequency vadda antennalu peddavigaa untayih udaaharanaku, quarter-wave niluvu, sumaruga ekkuvagaa untundi. pedda antennalanu nilabettadam mariyu antennalu takkuva koonaalaloo gananeeyamaina saktini prasarimpajeyela chudatam anevi suduura praantaalalo communicate cheyalanukune autsaahikulu edurkontunna rendu savaallu. praantiiya samachara marpidipai aasakti unna autsaahikulu eee bandpie kshitija samaantara dvidhruvaalu, viloma vii dvidhruva antennalu ledhaa loop antennalu vanti takkuva wire antennalanu upayoginchavacchu. bhoomiki naalugava tarangam kante daggaragaa unna addamgaa dhruveekarinchabadina antennalu pradhanamgaa adhika-koona vikiranaanni utpatti chestaayi, idhi niluvu insidence skywave vanti swalpa-dhooram vyaapti reetulaku upayogapadutundi. edemaina, appudappudu anukuulamaina vyaapti paristhithulatho, gananeeyamaina dhooraalanu ippatikee takkuva etthu antennalatho cover cheyavachu.
80 meterla dhooram shabdamtho baadhapadavachhu, graameena shabda naela suduura urumulu, maanava nirmita shabda vanarula nundi pracharam cheyabadina sabdam dwara sett cheyabadutundi. pattana mariyu suburban sabdam naela tarachugaa sthaanika sabdam dwara sthaapinchabadutundi, mariyu saadhaaranamgaa saadhaarana graameena sabdam naela kante 10-20 db balamgaa untundi. 80 meterla ettulo, prapanchamlooni daadaapu anni praantaalu urumulato kuudina sthaanika vaataavarana prerita sabdaalaku lobadi untaayi.
ionosphere yokka dii-pora kooda sankethaalanu grahinchadam dwara 80 meterlanu gananeeyamgaa prabhaavitam chestundi. pagatipuuta, 100 vaatlu mariyu saadhaarana dvidhruva antennanu upayoginche madhya ledhaa adhika akshaamsaalalo unna station garishta communication paridhini aasinchavachchu, idhi raatri samayamlo konni vaela maillu ledhaa anthakante ekkuva varaku vistaristundi. saadhaarana shakti mariyu saadhaarana antennalanu upayoginchi oka station dwara saradrutuvu chivarilo mariyu sheethaakaalamlo prapancha kavarejeeni mamuluga saadhinchavachchu. 80 meterla paie adhika nepathya sabdam, mukhyamgaa adhika ayano aavarana shoshanhatho kalipinappudu, adhika prabhaavavantamaina vikiranam shakti unna stationlu suduura samachara maarpidilo nirnayaatmaka prayojanaanni kaligi untaayi. chaalaa ekkuva antennalu ledhaa pedda niluvugaa dhruveekarinchabadina shrenulu mariyu puurti chattaparamaina saktitoe, prapanchavyaaptamgaa nammadagina samachara marpidi ratriputa margallo jarugutundi.
mobile operation saadhyame, ayithe quarter-wave antennatho poliste aacharanaatmaka mobile antennala saapekshamgaa takkuva podavu-saadhaaranamgaa kante takkuva-pratidhvani saadhinchadaaniki gananeeyamaina preraka loading avasaraniki daariteestundi. chinna antennalu chaalaa takkuva radiation nirodhakatanu kaligi untaayi kabatti, vaati saamarthyam saadhaaranamgaa 10 saatam kante takkuvagaa untundi. adanamgaa, loading kaayil yokka pedda prerana chaalaa irukaina bandwidth (adhika q) thoo antenna vyavasthanu srushtistundi.
charitra.
80 meterla byaandnu 1924 aktobaru 10naa jarigina moodava jaateeya radeo samavesam dwara united statesloni autsaahikulaku andubaatulo unchaaru. washington, dii. loe jarigina antarjaateeya radeo telegraph samavesam dwara prapanchavyaaptamgaa byaandnu ketaayinchaaru.sii., aktobaru 4,1927naa.
pracharam.
suduura samachara marpidi kosam upayoginchadagina garishta pounahpunyam graham meeda ekkadainaa 3.5 MHz kante takkuvagaa padipovadam valla, suduura samachara maarpidiki pradhana vyaapti avarodham pagatipuuta bhaarii dii-pora shoshana, idhi dx margalu ekkuvagaa undela chusukuntundi, ayithe puurtigaa kaadu, cheekatilo. konnisaarlu, bhoomadhyarekha urumulato kuudina kaaryakalaapaalaku dhooramgaa, dhruva margallo atyanta upayogakaramgaa unde muduru-vaipu buudida-rekha pracharam untundi.
adhika akshaamsaala vadda, konnisaarlu sheethaakaalamlo raatri samayamlo bandpie gurtinchadagina skip john kanipistundi, idhi 300 maillu/500 kimmy varaku untundi, idhi sameepa staeshanlatoe communication asadhyamga chestundi. idhi saadhaaranamgaa madhya ledhaa bhoomadhyarekha akshaamsaalalo ledhaa samvatsaramlo ekkuva bhagalalo ekkadainaa samasya kaadu, conny idhi appudappudu uttara airopa, united states yokka uttara shreni mariyu kenada vanti praantaalalo bandpie sthaanika sheethaakaala traafiknu parimitam chestundi.
vasanta mariyu vesavi kaalamlo (ushnamandalamlo edaadi podavunaa), suduura tuphaanula nundi vachhe merupulu gananeeyamgaa adhika nepathya shabda sthaayilanu srushtistaayi, tarachugaa saadhaarana samachara maarpidini nirvahinchadaaniki adhigaminchaleni addankigaa maarutundi. vesavi nelallo sameepamloni ushnaprasarana vaataavarana karyakalapalu sthaanika samachara marpidi kosam kooda byaandnu puurtigaa upayoginchalenivigaa chestaayi. sheethaakaalamlo sunn spot chakram yokka garishta samvatsaraalalo, auroral prabhavalu kooda byaandnu oka samayamlo gantala tarabadi panikiraniviga chestaayi.
frequency ketayimpu.
antarjaateeya telecommunication union mottam 500 kilojulanu 3.5 nundi 4 megahertz varaku americaloni autsaahikulaku, mariyu 3.5 nundi 3.8 ledhaa 3.9 megahertz prapanchamlooni itara praantaalalo autsaahikulaku ketaayinchindi. ayithe, america velupala autsaahikulu eee upayogakaramaina spectrum bhaganni itara viniyogadaarulato panchukoovaali, saadhaaranamgaa ummadi praathamika praatipadikana. phalitamgaa, prapanchamlooni prabhaavita praantaalalo adhikarulu autsaahika ketaayimpulanu 3.7 mhz mariyu byaand yokka paibhagam madhya parimitam chestaaru.
konni ketaayimpulu eee krindi vidhamgaa unnaayi (mhz loe):
diguva byaand anchu.
80 meterla diguva anchu sidablue udgaaraala dwara prabalamgaa untundi, takkuva 10 kiloj (3.5-3.51 emhechz) pradhanamgaa suduura samachara marpidi kosam upayoginchabadutundi. saadhaaranamgaa usb vayisnu upayoginchi, 80 meterla diguva anchuna frequencilanu aakraminchadam, akrama samudra kaaryakalaapaalaku idhi saadhaaranam. eee rakamaina karyakalapalu chaalaavaraku matsyakaara naukala nundi jarugutaayi. chaalaa varaku seey asea mariyu dakshina america naukaasrayaala nundi vastaayi, ayithe konni chattaviruddhamaina upayogam usa mariyu kenadian naukaasrayaala nundi vachhe noukalathoo jarugutundi.
eguva byaand anchu.
kenadian mariyu yuu.ess. khachitamaina transmitterlu unna autsaahikulu, diguva side byaand phone kosam 80 mea bandlo atyadhika upayoginchadagina frequency 3.999 mhz. radeo naanhyata mariyu paristhitini batti, audeo lakshanaalu mariyu saraina sardubaatlanu batti, takkuva side bandloni udgaralalo ekkuva bhaagam saadhaaranamgaa 3.9970-3.9997 mhz nii aakramistaayi. anni ssb transsiverlu gananeeyamaina sthaayi moodava mariyu aidava-arder utpattulanu kaligi untaayi, saadhaaranamgaa moodava arder intermodulation kosam pep kante 30-35 db krinda matrame untaayi. dheeni ardham 3.998 mhz lsb paina edainaa operation manchi parikaraalatoe kooda chattaviruddhamaina udgaaraala pramaadamtoe vastundi.
4 MHz byaand anchuku minchi udgaaraalu vistaristunnanduna eee carrier frequencini upayoginchadam chattabaddham kaadani oka saadhaarana apoha. adhika naanhyata gala communication receiverlu ledhaa selective level meterlu saadhaaranamgaa uttama spectrum analyserla kante merugaina dynamic paridhini kaligi untaayi. sarigga upayoginchina, avi byaand nundi bayataku vachhe udgaaraalanu soochinche adbhutamaina panini chestaayi. kontamandi vyaktulu avt-off-byaand operation nivedistuu vistruta receiver bandwidthnu upayoginchavacchu, receiver bandwidth transmitter bandwidthku jodistundi, kabatti bandwidth anedi nijamgaa unna daanikante vistrutamgaa untundi. transmitter bandwidth kante gananeeyamgaa irukaina receiver bandwidthnu upayoginchi byaand nundi bayataku vachhe udgaaraala yokka edainaa kolata cheyali.
chavakaina spectrum analyserlu, spectrum scopelu ledhaa panadapterlu saadhaaranamgaa bandwidth yokka off-air kolatalaku upayogapadavu. vistruta gurtimpu bandwidth, nemmadigaa sweep raetlu mariyu saadhaaranamgaa adhika sthaanika parisara sabdam sthaayilu saadhaaranamgaa balaheenamaina udgaaraalanu musugu chestaayi. eguva vaipu byaand, amplitude ledhaa frequency modulation vanti itara phone modlanu 3.999 mhz thoo upayoginchadam valana carrier frequency byaand anchu antataa modulate avutundi mariyu chattabaddhamgaa pariganinchabadadu. emission bandwidth byaand anchu antataa vistarinchananta varaku konni dayta modlu mariyu sidablue upayogapadataayi.
prasaara jokyam.
european 75 mea broadcast byaand uttara america 80 mea haam byaand ketaayimpunu ativyaapti chestundi. prasaara maargaaniki rendu chivarlalo raatri ayinappudu asea mariyu airopaloni kontamandi prasarakulu uttara americalo 3.9 mariyu 4.0 MHz madhya vinavacchu. ssb receiverlo, station digital radeo mondial modulation upayogistunnatlayite, station sampradaaya amplitude modulation ledhaa white naayistoe prasaram chestunnappudu idhi andukunna audiolo oka tone utpatti chestundi. receivernu AM carrier yokka khachitamaina frequenseeki amarchadam valla tone tolaginchabadutundi, conny audeo programme ippatikee vinabadavachu. okavela drm signal taginanta balamgaa unte sabdam balaheenamaina autsaahika sankethaalanu daachavacchu. chaalaa varaku drm sankethaalu 9 ledhaa 10 kilojula bandwidthnu aakramistaayi.

