Ama-AM Transmitters

Izisetshenziswa zokusakaza ze-AM ezichwepheshile:

Quality Premium

 

Kusukela ngo-2002, enezixazululo zayo eziphelele ze-AM radio turnkey, I-FMUSER Broadcast inikeze ngempumelelo izinkulungwane zeziteshi zomsakazo ze-AM emhlabeni jikelele ezingabizi Imikhiqizo yokusakaza ye-AM. Simboze izidluliseli zokusakaza ezimbalwa ze-AM ezinamandla aphumayo afika ku-200KW, imithwalo yokuhlola ye-AM yobungcweti, ibhentshi lokuhlola le-AM kanye neyunithi yokuqhathanisa ne-impedance. Lezi zinsiza ezithembekile zesiteshi somsakazo we-AM zenzelwe njengesixazululo sokusakaza esingabizi kakhulu kubo bonke abasakazi, kuhloswe ngazo ukuthuthukisa ikhwalithi yabo yokusakaza kanye nokunciphisa izindleko zokwakha isiteshi esisha sokusakaza se-AM noma ukushintshwa kwemishini.

 

Ama-AM Transmitters eRack agibelekele futhi aqinile, wonke athengiswa kusuka ku-1KW, 3KW, 5KW, 10KW, 25KW, 50KW, 100KW kuya ku-200KW

 

Izisakazi ze-AM ze-FMUSER ezinamandla aphezulu zihlanganisa ukusebenza kokusakaza okuhamba phambili embonini nomklamo obiza kancane. Wonke ama-transmitters e-AM afakwe isikrini sokuthinta kanye nesistimu yokulawula ukufinyelela okukude ukuze kuqinisekiswe ukuthi wonke umsakazi angakwazi ukulawula ukude izithumeli zabo empeleni. Inethiwekhi ethembekile yokufanisa okukhiphayo ivumela isidluliseli ukuthi sishunwe futhi sikhulise ukusebenza kahle ukuze sivumelane nokuqukethwe okuhlukahlukene kokusakaza.

 

I-FMUSER 200KW AM Transmitter 

 

#1 Qedela Idizayini Yakho Konke: Idizayini yemodeli ehlangene yalolu chungechunge lwama-transmitters e-AM yenza ukunakekela okusebenzayo kwemojuli kanye nemisebenzi yokuphendula okusheshayo ibe ngokoqobo. I-exciter eyisipele eyakhelwe ngaphakathi izovuleka ngokuzenzakalelayo ngemva kokwenzeka kwephutha, ihlinzeke inkampani ye-RF kumojula yamandla kanye nokulawula ukushintshashintsha kwesignali. Ngalezi zidluliseli ze-AM ezichwepheshile ezivela kumnikezeli wempahla waseShayina i-FMUSER, uzoba nezimo futhi usebenze kakhudlwana ukusebenzisa isikhala esilinganiselwe sesakhiwo somsakazo ukuthuthukisa ukusebenza kahle konke komsakazo.

 

#2 Isistimu Yemitha Eyakhelwe Ngaphakathi: Thola isistimu yokulinganisa i-impedance ezenzakalelayo efaka ukuncibilika okuzenzakalelayo, amandla kagesi, amandla amanje, namandla, kanye ne-coupler eyakhelwe ngaphakathi yokulinganisa i-spectrum—ekhuphukele emithwalweni yangempela ye-antenna ukukusiza konjiniyela ukukala ukukhishwa kwesiteshi esiseduze.

 

#3 Uhlelo Oluthembekile Lokwakhiwa Kwesekethe: Usebenzisa isifunda esiyingqayizivele ukuze uzinze ngamandla ugesi, uvimbele ukushintsha kwamandla kagesi kalayini we-AC, ubuyisele ngokuzenzakalelayo isimo sangaphambilini sokusebenza ngemva kokuhluleka kwamandla e-AC, i-overvoltage noma i-RF overload, futhi uthole amandla okushintsha imvamisa okusheshayo nalula ngaphandle kwamathuluzi akhethekile noma izisetshenziswa zokuhlola zangaphandle.

 

Idizayini ehlangene ne-modular ivumela ukufinyelela okulula kuyo yonke ingxenye i-solid-state-am-transmitter-rf-components-detail-fmuser-500px
 

Ama-transmitters e-FMUSER AM aklanyelwe ukusebenzisa isikhala esilinganiselwe sezintambo zangaphakathi ngokwedlulele - lokhu konga izindleko ezivele zibiza kakhulu zokukhiqiza imishini. Isakhiwo esingasenamsebenzi kakhulu, esishintshashintshayo sihlanganisa izingxenye zezwe eliqinile, ezizosiza isiteshi sakho se-AM silethe ukusakazwa kwekhwalithi ephezulu ngokungaguquki nangempumelelo futhi kunciphise ngokuqondile izindleko zokusebenza kwesiteshi sakho.

 

Isistimu yokupholisa komoya yonke-in-one ayinikezi nje kuphela lolu chungechunge ukusebenza kahle okuphelele okungaphezulu kuka-72%, kodwa futhi iqinisekisa ubungane bayo bemvelo, inciphisa ngokuqondile noma ngokungaqondile ukukhishwa kwekhabhoni okuningi, akusadingeki ukuthi udlule ukhathazekile ngokuthi izikweletu zikagesi zenyanga zibiza kakhulu yini. 

 

Sakaza nge-High End Solid State AM Transmitters!

  

I-FMUSER High Power Solid State AM transmitter Family: Amagama Olayini ENENTAMBO

 

Isimo esiqinile se-FMUSER 1KW AM transmitter.jpg Isimo esiqinile se-FMUSER 3KW AM transmitter.jpg Isimo esiqinile se-FMUSER 5KW AM transmitter.jpg Isimo esiqinile se-FMUSER 10KW AM transmitter.jpg
1KW AM Transmitter 3KW AM Transmitter 5KW AM Transmitter 10KW AM Transmitter
Isimo esiqinile se-FMUSER 25KW AM transmitter.jpg Isimo esiqinile se-FMUSER 50KW AM transmitter.jpg Isimo esiqinile se-FMUSER 100KW AM transmitter.jpg Isimo esiqinile se-FMUSER 200KW AM transmitter.jpg
25KW AM Transmitter 50KW AM Transmitter 100KW AM Transmitter 200KW AM Transmitter

 

Izici zedizayini ezingadingekile kanye nohlu olubanzi lokuxilonga lusiza abasakazi ukuthi bahlale beqinisekisa ukusebenza okuhle kakhulu emoyeni, futhi lezo yizixazululo zesidluliseli sokusakaza se-FMUSER sika-AM.

 

Imithwalo Yokuhlola ye-AM Nezinsiza

 

U-FMUSER, njengomphakeli wezinto zokusakaza ze-AM ochwepheshe, ophuma phambili izinzuzo zezindleko nokusebenza komkhiqizo, ilethe izixazululo zokusakaza ze-AM ezihamba phambili embonini eziteshini eziningi ze-AM ezinkulu emhlabeni jikelele. 

 

Ngokungeziwe kuma-transmitter amaningi we-AM wamandla aphezulu kakhulu angalethwa nganoma yisiphi isikhathi, uzophinde uthole ama-axiaries ahlukahlukene ukuze usebenze nesistimu enkulu ngasikhathi sinye, kufaka phakathi hlola imithwalo enamandla afinyelela ku-100kW/200kW (1, 3, 10kW iyatholakala), okusezingeni eliphezulu izitendi zokuhlola, kanye nothi amasistimu wokufanisa we-impedance

 

Ukukhetha isixazululo sokusakaza se-AM se-FMUSER kusho ukuthi usengakwazi ukwakha isethi ephelele yesistimu yokusakaza ye-AM esebenza kahle kakhulu ngezindleko ezilinganiselwe - eziqinisekisa ikhwalithi, impilo ende nokuthembeka kwesiteshi sakho esibanzi.

 

EZIPHUMA EZISEMQOKA

                  • Imithwalo Engazweli
                  • Imithwalo ye-RF (bona Ikhathalogi)
                  • I-CW ilayisha amandla afinyelela kububanzi be-MW
                  • Ilayisha i-Pulse module yamandla aphezulu kakhulu
                  • Ukushintsha kwe-matrix ye-RF (i-coaxial/symmetrical)
                  • Amabhaluni kanye nemigqa yokuphakelayo
                  • Amakhebula Anamandla Aphezulu
                  • Izinhlelo ezisizayo zokulawula/zokuqapha
                  • Izinhlelo zokuphepha ezingadingekile
                  • Izinketho ezengeziwe zokuhlanganisa lapho ucela
                  • Izitendi Zokuhlola Imojula
                  • Amathuluzi Nezisetshenziswa Ezikhethekile

 

#1 Solid-state AM Transmitter Test Imithwalo

 

Ama-amplifiers amaningi e-FMUSER RF, ama-transmitter, izinsiza zikagesi noma ama-modulator asebenza ngamandla aphezulu kanye namandla amaphakathi. Lokhu kusho ukuthi akunakwenzeka ukuhlola izinhlelo ezinjalo ngemithwalo yazo ehlosiwe ngaphandle kwengozi yokulimaza umthwalo. Futhi, ngamandla anjalo aphumayo aphezulu, amagagasi aphakathi nendawo adingeka ukuthi agcinwe noma ahlolwe ngaso sonke isikhathi, ngakho-ke umthwalo wokuhlola wekhwalithi ephezulu uyadingeka esiteshini sokusakaza. Imithwalo yokuhlola ekhiqizwe i-FMUSER ihlanganise zonke izingxenye ezidingekayo kukhabethe lezinto zonke, okuvumela isilawuli kude nokushintshashintsha okuzenzakalelayo&mathupha - ngempela, lokhu kungasho lukhulu kunoma yikuphi ukuphathwa kwesistimu yokusakaza ye-AM.

 

 I-FMUSER AM Yokuhlola Ilayisha Umndeni: kuze kufike ku-200KW

 

1KW, 3KW, 10KW isimo esiqinile AM ​​transmtter dummy load.jpg 100KW AM dummy load.jpg 200KW AM dummy load.jpg
1, 3, 10KW AM ukuhlolwa komthwalo 100KW AM Umthwalo wokuhlola isidlulisi 200KW AM Umthwalo wokuhlola isidlulisi

 

#2 Izimo Zokuhlola Imojula ye-FMUSER ye-AM

 

Izitendi zokuhlola zenzelwe ikakhulukazi ukuqinisekisa ukuthi ama-transmitters e-AM asesimweni esihle sokusebenza ngemuva kokulungiswa kwe-buffer amplifier kanye nebhodi le-amplifier yamandla. Uma usuphumelele ukuhlolwa, isidlulisi singasebenza kahle - lokhu kusiza ukwehlisa izinga lokuhluleka kanye nezinga lokumiswa.

 

Ibhentshi lokuhlola i-AM Transmitter

 

#3 FMUSER's AM Antenna I-Impedans Matching System

 

Kuma-antenna e-AM transmitter, izimo zezulu eziguquguqukayo njengokuduma, ukuna nokuswakama, njll. izinto ezibalulekile ezidala ukuchezuka kwe-impedance (ngokwesibonelo, 50 Ω), yingakho nje kudingeka isistimu yokufanisa i-impedance - ukufanisa kabusha i-antenna impedance. . Izimpondo zokusakaza ze-AM zivame ukuba nkulu ngosayizi futhi kulula kakhulu ukuthiya ukuchezuka, futhi uhlelo lwe-FMUSER lwe-impedance luklanyelwe ukulungisa okuguquguqukayo kokusebenza kwezimpondo zokusakaza ze-AM. Uma ukuthikamezeka kwe-antenna ye-AM kuchezuka ngo-50 Ω, isistimu eguquguqukayo izolungiswa ukuze iphinde ihambisane nokubambezeleka kwenethiwekhi yokushintshashintsha ibe ngu-50 Ω, ukuze kuqinisekiswe ikhwalithi yokudlulisela engcono kakhulu yesidlulisi sakho se-AM.

 

Isistimu ye-antenna impedance ye-AM

Iyunithi ye-AM ye-antenna

 

 

Imikhawulo ye-Amplitude Modulation

1. Ukusebenza Okuphansi - Njengoba amandla awusizo asemabhendini amancane mancane kakhulu, ngakho-ke ukusebenza kahle kohlelo lwe-AM kuphansi.

 

2. Ibanga Lokusebenza Elinomkhawulo - Ububanzi bokusebenza buncane ngenxa yokusebenza kahle okuphansi. Ngakho, ukudluliswa kwamasignali kunzima.

 

3. Umsindo eReception - Njengoba umamukeli womsakazo ekuthola kunzima ukuhlukanisa phakathi kokwahluka kwe-amplitude emele umsindo nalawo anezimpawu, umsindo onzima uvame ukwenzeka lapho eyamukela.

 

4. Ikhwalithi Yomsindo Engalungile - Ukuze uthole ukwamukelwa okuthembekile okuphezulu, zonke imisindo yokulalelwayo kuze kube yi-15 KiloHertz kufanele ikhiqizwe futhi lokhu kudinga umkhawulokudonsa ongu-10 KiloHertz ukuze kuncishiswe ukuphazamiseka kweziteshi zokusakaza eziseduze. Ngakho-ke eziteshini zokusakaza ze-AM ikhwalithi yomsindo yaziwa njengempofu.

Ukusetshenziswa Nokusetshenziswa Kwe-Amplitude Modulation

1. Imisakazo yomsakazo

2. Ukusakazwa kwe-TV

3. Isicabha segalaji sivula amarimothi angenakhiye

4. Idlulisa izimpawu ze-TV

5. Ukuxhumana kwamagagasi amafushane omsakazo

6. Indlela emibili yokuxhumana ngomsakazo

Ukuqhathaniswa kwe-AM Ehlukahlukene

I-VSB-SC

1. Incazelo - Ibhande eseceleni elingenalutho (ekuxhumaneni nomsakazo) iyibhande eseceleni elinqanyulwe ingxenye noma lacindezelwa.

2. Isicelo - Ukusakazwa kwe-TV nokusakazwa kweRadio

3. Usetshenziswa - Idlulisa amasignali e-TV

I-SSB-SC

1. Incazelo - I-Single-sidebandmodulation (SSB) iwukuthuthukiswa kwe-amplitude modulation esebenzisa ngempumelelo amandla kagesi kanye nomkhawulokudonsa.

2. Isicelo - Ukusakazwa kwe-TV kanye nemisakazo ye-Shortwave Radio

3. Usetshenziswa - Ukuxhumana komsakazo we-Shortwave

I-DSB-SC

1. Incazelo - Kwezokuxhumana ngerediyo, ibhendi eseceleni iyibhande lamafrikhwensi elingaphezu noma eliphansi kunefrikhwensi yenkampani yenethiwekhi, eliqukethe amandla ngenxa yenqubo yokushintshashintsha.

2. Isicelo - Ukusakazwa kwe-TV nokusakazwa kweRadio

3. Usetshenziswa - 2-izindlela zokuxhumana ngomsakazo

 

I-PARAMETER

I-VSB-SC

I-SSB-SC

I-DSB-SC

Incazelo

Ibhendi eseceleni ye-vestigial (ekuxhumaneni nomsakazo) iyibhande eseceleni elinqanyulwe ingxenye noma lacindezelwa.

I-Single-sidebandmodulation (SSB) iwukuthuthukiswa kwe-amplitude modulation esebenzisa ngempumelelo amandla kagesi kanye nomkhawulokudonsa.

Kwezokuxhumana ngerediyo, ibhendi eseceleni iyibhande lamafrikhwensi elingaphezu noma eliphansi kunefrikhwensi yenkampani yenethiwekhi, eliqukethe amandla ngenxa yenqubo yokushintshashintsha.

 

 

Isicelo

Ukusakazwa kwe-TV nokusakazwa kweRadio

Ukusakazwa kwe-TV kanye nemisakazo ye-Shortwave Radio

Ukusakazwa kwe-TV nokusakazwa kweRadio

Usetshenziswa

Idlulisa amasignali e-TV

Ezokuxhumana ngomsakazo we-Shortwave

Indlela engu-2 yokuxhumana ngomsakazo

Umhlahlandlela ophelele we-Amplitude Modulations (AM)

Iyini i-Amplitude Modulation (AM)?

- "Ukushintshashintshashintshashintshashintshashintshayo kuyinqubo yokwengeza isignali yefrikhwensi ephansi kumafrikhwensi aphezulu isignali yenkampani yenethiwekhi."

 

- "Inqubo yokuguquguquka ingachazwa njengokwehluka kwegagasi elithwala i-RF ngokuvumelana ngobuhlakani noma ulwazi kusignali yefrikhwensi ephansi."

 

- "Ukuguquguquka kuchazwa njengesandulela lapho ezinye izici, ngokuvamile i-amplitude, imvamisa noma isigaba, sesithwali siyahlukahluka ngokuhambisana nenani elisheshayo lenye i-voltage ethile, ebizwa ngokuthi i-modulating voltage."

Kungani Kudingeka Ukuguquguquka?

1. Uma kudlalwa izinhlelo ezimbili zomculo ngesikhathi esisodwa endaweni ekude, kungaba nzima ngomuntu ukuthi alalele umthombo owodwa futhi angawuzwa umthombo wesibili. Njengoba yonke imisindo yomculo inobubanzi obufanayo befrikhwensi, yakha cishe ku-50 Hz kuya ku-10KHz. Uma uhlelo olufiswayo lushintshelwa kubhendi yamaza aphakathi kuka-100KHz no-110KHz, futhi uhlelo lwesibili lushintshele phezulu ebhendini ephakathi kuka-120KHz no-130KHz, Zombili lezi zinhlelo zisanikeza umkhawulokudonsa ongu-10KHz futhi umlaleli angakwazi (ngokukhethwa kwebhendi) ukubuyisa uhlelo. ngokuzikhethela kwakhe. Umamukeli uzokwehlisa kuphela ibhendi ekhethiwe yamafrikhwensi iye ebangeni elifanele lika-50Hz ukuya ku-10KHz.

 

2. Isizathu sesibili sobuchwepheshe sokushintsha isignali yomlayezo iye kwifrikhwensi ephezulu sihlobene nosayizi we-antenna. Kufanele kuqashelwe ukuthi usayizi we-antenna ulingana ngokuphambene nemvamisa okufanele imisebe. Lawa amamitha angu-75 ku-1 MHz kodwa ku-15KHz senyukele kumamitha angu-5000 (noma ngaphezulu kwamafidi angu-16,000) uthi olume mpo lwalo sayizi alunakwenzeka.

 

3. Isizathu sesithathu sokumodela isithwali sefrikhwensi ephezulu ukuthi amandla e-RF (amafrikhwensi omsakazo) azohamba ibanga elide kunenani lamandla adluliswa njengamandla omsindo.

Izinhlobo Zokushintshashintsha Kwezwi

Isignali yenkampani yenethiwekhi iyigagasi le-sine kumafrikhwensi yenkampani yenethiwekhi. I-equation engezansi ibonisa ukuthi i-sine wave inezici ezintathu ezingashintshwa.

 

I-voltage esheshayo (E) =Ec(max)Sin(2πfct + θ)

 

Amagama angase ahluke i-carrier voltage Ec, i-carrier frequency fc, kanye ne-engeli yesigaba senkampani yenethiwekhi θ. Ngakho izindlela ezintathu zokuguquguquka zingenzeka.

1. I-Amplitude Modulation

Ukushintshwa kwe-amplitude kuwukwenyuka noma ukuncipha kwe-voltage yenkampani yenethiwekhi (Ec), zonke ezinye izici zizohlala zingashintshile.

2. Ukushintshashintsha kwemvamisa

Ukushintsha imvamisa kuwushintsho kumvamisa yenkampani yenethiwekhi (fc) nazo zonke ezinye izici ezihlala zingashintshi.

3. Ukushintshashintsha Kwesigaba

Ukushintshwa kwesigaba kuwushintsho ku-engeli yesigaba senkampani yenethiwekhi (θ). I-engeli yesigaba ayikwazi ukushintsha ngaphandle kokuthinta noshintsho kwimvamisa. Ngakho-ke, ukuguquguquka kwesigaba empeleni kuwuhlobo lwesibili lokuguqulwa kwemvamisa.

INCAZELO KA-AM

Indlela yokwehluka kwe-amplitude yegagasi elithwala imvamisa ephezulu ngokuhambisana nolwazi okufanele ludluliselwe, ukugcina imvamisa nesigaba segagasi lesithwali kungashintshile kubizwa ngokuthi i-Amplitude Modulation. Ulwazi lubhekwa njengesignali yokumodulayo futhi lubekwe phezulu kugagasi lenkampani yenethiwekhi ngokuzisebenzisa zombili kumoduli. Umdwebo onemininingwane obonisa inqubo yokuguquguquka kwe-amplitude unikezwe ngezansi.

 

 

Njengoba kuboniswe ngenhla, i-wave yenkampani yenethiwekhi inemijikelezo eyingxenye enhle nengalungile. Yomibili le mijikelezo iyahlukahluka ngokuya ngolwazi oluzothunyelwa. Isithwali sibe sesiqukethe amagagasi e-sine ama-amplitude awo alandela ukuhluka kwe-amplitude yegagasi elishintshayo. Isithwali sigcinwa emvilophini eyakhiwe yi-wave modulating. Kusukela emfanekisweni, ungabona futhi ukuthi ukuhluka kwe-amplitude yesithwali semvamisa ephezulu kusemvamisa yesignali futhi imvamisa ye-wave yenethiwekhi iyafana nemvamisa yegagasi eliwumphumela.

Ukuhlaziywa kwe-Amplitude Modulation Carrier Wave

Vumela vc = Vc Sin wct

vm = Vm Sin wmt

 

vc – Inani elisheshayo lenkampani yenethiwekhi

Vc – Inani eliphakeme kakhulu lenkampani yenethiwekhi

I-Wc - Isivinini se-Angular yesithwali

vm - Inani elisheshayo lesignali yokumodela

I-Vm - Inani eliphezulu lesiginali yokumodela

wm - Isivinini se-angular yesiginali yokumodela

fm - Ishintsha imvamisa yesiginali

 

Kumele kuqashelwe ukuthi i-engeli yesigaba ihlala njalo kule nqubo. Kanjalo kunganakwa.

 

Kumele kuqashelwe ukuthi i-engeli yesigaba ihlala njalo kule nqubo. Kanjalo kunganakwa.

 

I-amplitude ye-wave yenkampani yenethiwekhi iyahlukahluka ku-fm.I-amplitude modulated wave inikezwa isibalo A = Vc + vm = Vc + Vm Sin wmt

= Vc [1+ (Vm/Vc Sin wmt)]

 

= Vc (1 + mSin wmt)

 

m - Inkomba yokuguquguquka. Isilinganiso se-Vm/Vc.

 

Inani elisheshayo le-amplitude modulated wave linikezwa i-equation v = A Sin wct = Vc (1 + m Sin wmt) Sin wct

 

= Vc Sin wct + mVc (Sin wmt Sin wct)

 

v = Vc Sin wct + [mVc/2 Cos (wc-wm)t – mVc/2 Cos (wc + wm)t]

 

Isibalo esingenhla simele isamba samagagasi e-sine amathathu. Eyodwa ene-amplitude ye-Vc kanye nemvamisa ye-wc/2, eyesibili ene-amplitude ye-mVc/2 kanye nemvamisa ka (wc – wm)/2 neyesithathu enobubanzi be-mVc/2 kanye nemvamisa ye- (wc) + wm)/2 .

 

Empeleni isivinini se-angular yesiphathi saziwa sikhulu kunesivinini se-angular yesiginali yokumodela (wc >> wm). Ngakho-ke, izilinganiso ze-cosine zesibili nezesithathu ziseduze kakhulu nemvamisa yenkampani yenethiwekhi. Isibalo simelwe ngesithombe njengoba kukhonjisiwe ngezansi.

I-Frequency Spectrum ye-AM Wave

Imvamisa eseceleni ephansi – (wc – wm)/2

Imvamisa eseceleni eliphezulu – (wc +wm)/2

 

Izingxenye zefrikhwensi ezikhona kugagasi le-AM zimelelwa imigqa eqondile cishe etholakala eduze kwe-eksisi yefrikhwensi. Ubude bomugqa ngamunye oqondile budwetshwa ngokulingana nobukhulu bawo. Njengoba isivinini se-angular yesiphathi sikhulu kunesivinini se-angular yesiginali eshintshayo, i-amplitude yamafrikhwensi ebhendi eseceleni ngeke idlule uhhafu we-amplitude yenkampani yenethiwekhi.

 

Ngakho-ke ngeke kube khona ushintsho kumafrikhwensi okuqala, kodwa amafrikhwensi ebhendi eseceleni (wc – wm)/2 kanye (wc +wm)/2 azoshintshwa. Eyangaphambili ibizwa nge-upper side band (USB) frequency futhi kamuva yaziwa ngokuthi i-low side band (LSB) frequency.

 

Njengoba imvamisa yesiginali i-wm/2 ikhona kumabhendi aseceleni, kuyacaca ukuthi ingxenye ye-voltage yenkampani yenethiwekhi ayidlulisi noma yiluphi ulwazi.

 

Amafrikhwensi amabhande aseceleni amabili azokhiqizwa lapho inkampani yenethiwekhi ilungiswa nge-amplitude yifrikhwensi eyodwa. Okusho ukuthi, igagasi le-AM linobubanzi bebhendi ukusuka ku-(wc – wm)/2 kuya ku-(wc +wm)/2, okungukuthi, 2wm/2 noma kabili imvamisa yesiginali ikhiqizwa. Uma isignali yokumodela inefrikhwensi engaphezu kweyodwa, amafrikhwensi amabili ebhendi eseceleni akhiqizwa yiwo wonke amafrikhwensi. Ngokufanayo kumafrikhwensi amabili wesiginali yokumodelayo engu-2 LSB kanye namafrikhwensi ama-2 USB azokhiqizwa.

 

Amabhendi aseceleni amafrikhwensi akhona ngaphezu kwefrikhwensi yenkampani yenethiwekhi azofana nalawo akhona ngezansi. Amafrikhwensi ebhendi eseceleni akhona ngaphezu kwefrikhwensi yenkampani yenethiwekhi aziwa njengebhendi eseceleni ephezulu futhi wonke lawo angaphansi kwefrikhwensi yenkampani yenethiwekhi ayingxenye yebhendi eseceleni engezansi. Amafrikhwensi e-USB amele amanye amafrikhwensi ashintshayo futhi amaza e-LSB amele umehluko phakathi kwefrikhwensi yokumodela kanye nefrikhwensi yenkampani yenethiwekhi. Umkhawulokudonsa ophelele umelwe ngokuya ngemvamisa yokumodulatha ephezulu futhi ilingana nokuphindwe kabili kwale mvamisa.

Inkomba yokuguquguquka (m)

Isilinganiso esiphakathi koshintsho lwe-amplitude yegagasi lenkampani yenethiwekhi ukuya ku-amplitude yegagasi elithwala elivamile libizwa ngokuthi inkomba yokumodulation. Imelwe uhlamvu ‗m'.

 

Kungase futhi kuchazwe njengobubanzi lapho i-amplitude ye-wave yenkampani yenethiwekhi ihluka khona ngesignali yokumodulating. m = Vm/Vc.

 

Iphesenti lokushintshwa kwephesenti, %m = m*100 = Vm/Vc * 100

Ukushintsha kwephesenti kuphakathi kuka-0 no-80%.

 

Enye indlela yokuveza inkomba yokuguquguquka ihambisana namanani aphezulu kanye nobuncane be-amplitude ye-wave yenethiwekhi yenethiwekhi. Lokhu kuboniswa emfanekisweni ongezansi.

 

 

2 Vin = Vmax – Vmin

 

I-Vin = (Vmax – Vmin)/2

 

Vc = Vmax – Vin

 

= Vmax – (Vmax-Vmin)/2 =(Vmax + Vmin)/2

Ukushintsha amanani e-Vm ne-Vc ku-equation m = Vm/Vc , sithola

 

M = Vmax – Vmin/Vmax + Vmin

 

Njengoba kushiwo ngaphambili, inani lika-‗m' liphakathi kuka-0 no-0.8. Inani lika-m linquma amandla kanye nekhwalithi yesiginali edlulisiwe. Kugagasi le-AM, isiginali iqukethwe ezinhlobonhlobo ze-amplitude yenkampani yenethiwekhi. Isignali yomsindo edluliswayo izoba buthakathaka uma igagasi lenkampani yenethiwekhi lilungiswa ngezinga elincane kakhulu. Kodwa uma inani lika-m lidlula ubunye, okukhiphayo kwesidlulisi kukhiqiza ukuhlanekezela okuyiphutha.

Ubudlelwano Bamandla kugagasi le-AM

Igagasi elishintshiwe linamandla amaningi kunalawo abenawo igagasi lenkampani yenethiwekhi ngaphambi kokumodela. Isamba sezingxenye zamandla ekushintsheni kwe-amplitude zingabhalwa kanje:

 

I-Ptotal = I-Pcarrier + PLSB + PUSB

 

Uma kucatshangelwa ukumelana okwengeziwe njengokumelana kwe-antenna R.

 

I-Pcarrier = [(Vc/2)/R]2 = V2C/2R

 

Ibhendi eseceleni ngayinye inenani elingu-m/2 Vc kanye nevelu ye-rms engu-mVc/22. Ngakho amandla ku-LSB ne-USB angabhalwa ngokuthi

 

I-PLSB = PUSB = (mVc/22)2/R = m2/4*V2C/2R = m2/4 I-Pcarrier

 

 

I-Ptotal = V2C/2R + [m2/4*V2C/2R] + [m2/4*V2C/2R] = V2C/2R (1 + m2/2) = I-Pcarrier (1 + m2/2)

 

Kwezinye izinhlelo zokusebenza, inkampani yenethiwekhi ilungiswa kanyekanye ngamasiginali ambalwa wokumodela i-sinusoidal. Esimeni esinjalo, inkomba yokuguquguquka isiyonke inikezwa njenge

Mt = (m12 + m22 + m32 + m42 + .....

 

Uma i-Ic ne-It ingamanani e-rms wamanje ongashintshiwe kanye nengqikithi eguquliwe kanye no-R kuwukumelana okugeleza lokhu kwamanje, khona-ke.

 

I-Ptotal/Pcarrier = (It.R/Ic.R)2 = (It/Ic)2

 

Isamba/I-Pcarrier = (1 + m2/2)

 

It/Ic = 1 + m2/2

 

I-Amplitude Modulation (AM) FAQ

1. Chaza ukushintshashintsha kwezwi?

Ukushintshashintshashintshashintshashintshayo kuyinqubo lapho ezinye izici zesignali yenkampani yenethiwekhi ihlukanisiwe ngokuvumelana nevelu esheshayo yesiginali yokumodulayo.

2. Yiziphi izinhlobo ze-analog modulation?

Ukushintshwa kwe-amplitude.

Ukushintshashintsha Kwe-Angle

Ukushintshwa kwemvamisa

Ukushintshwa kwesigaba.

3. Chaza ukujula kokuguquguquka.

Ichazwa njengesilinganiso esiphakathi kobukhulu bomlayezo nalelo lobubanzi benkampani yenethiwekhi. m=Em/Ec

4. Yiziphi iziqu zokuguquguquka?

Ngaphansi kwe-modulation. m<1

Ukushintshashintsha okubalulekile m=1

Ukushintshaniswa okungaphezulu kwe-m>1

5. Siyini isidingo sokuguquguquka?

Izidingo zokuguquguquka:

Ukudlulisa kalula

Multiplexing

Umsindo owehlisiwe

Umkhawulokudonsa omncane

Ukunikezwa kwemvamisa

Yehlisa ukulinganiselwa kwezinto zokusebenza

6. Yiziphi izinhlobo zamamoduli e-AM?

Kunezinhlobo ezimbili zamamoduli e-AM. Kunjalo

- Amamojula alayini

- Amamojula angewona alayini

 

Amamojula alayini ahlukaniswa kanjena

I-Transistor module

 

Kunezinhlobo ezintathu ze-transistor modulator.

Imoduli yomqoqi

I-emitter module

I-modulator eyisisekelo

Ukushintsha ama-modulators

 

Amamojula angewona alayini ahlukaniswa ngale ndlela elandelayo

Ummeli wesikwele womthetho

Imoduli yomkhiqizo

I-modulator elinganisiwe

7. Uyini umehluko phakathi kokuguquguquka kwezinga eliphezulu nezinga eliphansi?

Ekuguquguqukeni kwezinga eliphezulu, i-modulator amplifier isebenza kumazinga aphezulu wamandla futhi iletha amandla ngqo othini. Ekuguquguqukeni kwezinga eliphansi, i-modulator amplifier yenza ukushintshashintsha kumazinga wamandla aphansi uma kuqhathaniswa. Isignali eshintshiwe ibe isikhuliswa ibe ileveli yamandla aphezulu ngesikhulisi samandla sekilasi B. I-amplifier inika amandla okuthi uthi.

8. Chaza Ukutholwa (noma) Ukwehliswa.

Ukutholwa kuyinqubo yokukhipha isignali yokumodulating kusiphathi esimoduli. Izinhlobo ezahlukene zama-detectors zisetshenziselwa izinhlobo ezahlukene zokuguquguquka.

9. Chaza i-Amplitude Modulation.

Ekuguquguqukeni kwe-amplitude, i-amplitude yesiginali yenkampani yenethiwekhi iyahlukahluka ngokuya ngokuhlukahluka kwe-amplitude yesiginali yokulinganisa.

 

Isignali ye-AM ingamelwa ngokwezibalo njengokuthi, i-eAM = (Ec + Em sinωmt ) sinωct futhi inkomba yokushintshashintsha inikezwa ngokuthi,m = Em /EC (noma) Vm/Vc

10. Iyini i-Super Heterodyne Receiver?

Isamukeli se-super heterodyne siguqula wonke amafrikhwensi e-RF angenayo abe yifrikhwensi engaguquki ephansi, ebizwa ngokuthi i-intermediate frequency (IF). Le IF ibe yi-amplitude futhi itholwe ukuze kutholwe isignali yoqobo.

11. Kuyini ukushintshashintsha kwethoni eyodwa nokuguquguquka kwethoni eminingi?

- Uma ukuguquguquka kwenzelwe isignali yomlayezo enengxenye yefrikhwensi engaphezu kweyodwa, ukushintshashintsha kubizwa ngokuthi i-multi tone modulation.

- Uma ukuguquguquka kwenzelwe isignali yomlayezo enencenye yefrikhwensi eyodwa kusho ukuguquguquka kubizwa ngokuthi ukuguquguquka kwethoni eyodwa.

12. Qhathanisa i-AM ne-DSB-SC kanye ne-SSB-SC.

S.No

Isignali ye-AM

I-DSB-SC

I-SSB-SC

1

Umkhawulokudonsa 2fm

Umkhawulokudonsa 2fm

Umkhawulokudonsa fm

2

Iqukethe i-USB,LSB,Inkampani Yenethiwekhi

Iqukethe i-USB.LSB

I-USB.LSB

3

Amandla engeziwe ayadingeka ukuze kudluliselwe

Amandla adingekayo angaphansi kwalawo we-AM

Amandla adingekayo angaphansi kwe-AM &DSB-SC

13. Yiziphi izinzuzo ze-VSB-AM?

- Inomkhawulokudonsa omkhulu kune-SSB kodwa ingaphansi kwesistimu ye-DSB.

- Ukudluliswa kwamandla kukhulu kune-DSB kodwa ngaphansi kwesistimu ye-SSB.

- Ayikho ingxenye yefrikhwensi ephansi elahlekile. Ngakho-ke igwema ukuhlanekezelwa kwesigaba.

14. Uzoyikhiqiza kanjani i-DSBSC-AM?

Kunezindlela ezimbili zokukhiqiza i-DSBSC-AM njenge

- Imodyuli elinganiselayo

- Ama-modulators akhang.

15. Yiziphi izinzuzo zemodulator yeringi?

- Okukhiphayo kuzinzile.

- Akudingi umthombo wamandla wangaphandle ukwenza ama-diode asebenze. c).Cishe akukho sondlo.

- Impilo ende.

16. Chaza Ukwehliswa.

Ukwehliswa kwenani noma ukutholwa inqubo lapho i-voltage yokumodulatha itholwa kusiginali eshintshiwe. Kuyinqubo ehlehlayo yokuguquguquka. Amadivayisi asetshenziselwa ukudilizwa noma ukutholwa abizwa ngokuthi ama-demodulators noma izitholi. Ngokushintshwa kwe-amplitude, izitholi noma ama-demodulators zihlukaniswa njenge: 

 

- Imitshina yesikwele-mthetho

Izithungatha zemvilophu

17. Chaza i-Multiplexing.

I-Multiplexing ichazwa njengenqubo yokudlulisa amasignali emiyalezo eminingana Ngesikhathi esisodwa esiteshini esisodwa.

18. Chaza i-Multiplexing ye-Frequency Division.

Ukuphindwaphindwa kwe-frequency division kuchazwa ngokuthi amasiginali amaningi adluliselwa kanyekanye ngesignali ngayinye ethatha i-slot yefrikhwensi ehlukile ngaphakathi komkhawulokudonsa ojwayelekile.

19. Chaza Ibhande Lonogada.

Amabhendi Onogada ethulwa ku-spectrum ye-FDM ukuze kugwenywe noma yikuphi ukuphazamiseka phakathi kwamashaneli aseduze. Banzi amabhande onogada, Kuncane ukuphazamiseka.

20. Chaza i-SSB-SC.

- I-SSB-SC imele I-Single Side Band Suppressed Carrier

Uma kudluliselwa ibhendi eseceleni eyodwa, ukuguquguquka kubizwa ngokuthi i-Single side band modulation. Ibizwa nangokuthi njenge-SSB noma i-SSB-SC.

21. Chaza i-DSB-SC.

Ngemva kokushintshashintsha, inqubo yokudlulisa amabhande aseceleni (i-USB, i-LSB) iyodwa kanye nokucindezela inkampani yenethiwekhi ibizwa ngokuthi I-Double Side Band-Suppressed Carrier.

22. Yibuphi ububi be-DSB-FC?

- Ukumoshwa kwamandla kwenzeka ku-DSB-FC

I-DSB-FC iyisistimu yomkhawulokudonsa ongasebenzi kahle.

23. Chaza Ukutholwa Okuhambisanayo.

Ngesikhathi senkampani yenethiwekhi ye-Demodulation ihambisana ncamashi noma ivunyelaniswe kukho kokubili imvamisa nesigaba, negagasi elithwalayo langempela elisetshenziselwa ukukhiqiza igagasi le-DSB-SC.

 

Le ndlela yokuthola ibizwa ngokuthi ukutholwa okuhambisanayo noma ukutholwa okuhambisanayo.

24. Yini i-Vestigial Side Band Modulation?

I-Vestigial Sideband Modulation ichazwa njengokuguquguquka lapho enye yebhande eseceleni icindezelwa kancane bese kudluliselwa umsalela welinye ibhande eseceleni ukuze kunxeshezelwe lokho kucindezelwa.

25. Yiziphi izinzuzo zokudluliswa kwe-signband side?

- Ukusetshenziswa kwamandla

Ukongiwa komkhawulokudonsa

- Ukunciphisa umsindo

26. Yibuphi ububi bokudluliswa kwebhendi yohlangothi olulodwa?

Abamukeli abayinkimbinkimbi: Amasistimu ebhendi eseceleni eyodwa adinga izamukeli eziyinkimbinkimbi futhi ezibizayo ngaphezu kokudluliswa kwe-AM okujwayelekile.

Izinkinga zokushuna: Abamukeli bebhendi eseceleni eyodwa badinga i-tunig eyinkimbinkimbi futhi enembe kunezamukeli ezivamile ze-AM.

27. Qhathanisa amamojula aqondile nangawona mugqa?

Ama-Linear Modulators

- Ukuhlunga okunzima akudingekile.

- Lawa ma-modulator asetshenziswa ekuguquguqukeni kwezinga eliphezulu.

- I-voltage yenkampani yenethiwekhi inkulu kakhulu kune-modulating signal voltage.

Amamojula Angewona Alayini

- Ukuhlunga okunzima kuyadingeka.

- Lawa ma-modulator asetshenziswa ekushintsheni kwezinga eliphansi.

- I-voltage yesiginali eshintshayo inkulu kakhulu kunevoltheji yesignali yenkampani yenethiwekhi.

28. Kuyini ukuhumusha izikhathi eziningi?

Ake sithi isignali iyibhendi ekhawulelwe kububanzi befrikhwensi esukela kufrikhwensi f1 ukuya kuf2. Inqubo yokuhumusha imvamisa ingenye lapho isiginali yoqobo ithathelwa indawo isignali entsha ububanzi bayo bokubukeka busuka ku-f1' kanye no-f2' futhi isiphi isignali entsha ethwala, ngendlela ebuyiselekayo ulwazi olufanayo nalolo oluthwelwe isignali yoqobo.

29. Yiziphi izimo ezimbili ezivezwe ekuhumusheni izikhathi eziningi?

Ukuguqulwa Okuphezulu: Kulesi simo imvamisa yenkampani yenethiwekhi ehunyushiwe inkulu kunenkampani yenethiwekhi engenayo

Ukuguqulwa Okuphansi: Kulesi simo imvamisa yenkampani yenethiwekhi ehunyushiwe incane kunemvamisa ekhulayo yenkampani yenethiwekhi.

 

Ngakho-ke, isignali ye-Narrowband FM idinga ngokuyisisekelo umkhawulokudonsa wokudlulisa ofanayo nesiginali ye-AM.

30. Iyini i-BW yegagasi le-AM?

 Umehluko phakathi kwalawa mafrikhwensi amabili adlulele ulingana nomkhawulokudonsa wegagasi le-AM.

 Ngakho-ke, Umkhawulokudonsa, B = (fc + fm) - (fc - fm) B = 2fm

31. Iyini i-BW ye-DSB-SC isignali?

Umkhawulokudonsa, B = (fc + fm) - (fc - fm) B = 2f

Kusobala ukuthi umkhawulokudonsa wokuguquguquka kwe-DSB-SC uyafana nowamagagasi avamile we-AM.

32. Yiziphi izindlela zokwehlisa amasiginali we-DSB-SC?

Isiginali ye-DSB-SC ingehliswa ngokulandela izindlela ezimbili:

- Indlela yokuthola i-synchronous.

- Ukusebenzisa umtshina wemvilophu ngemva kokufakwa kabusha kwenkampani yenethiwekhi.

33. Bhala izinhlelo zokusebenza ze-Hilbert transform?

- Ukwenza amasiginali we-SSB,

- Ngokuklama izihlungi zohlobo lwesigaba esincane,

- Ukuze kube nokumelela amasignali band pass.

34. Yiziphi izindlela zokukhiqiza isignali ye-SSB-SC?

Amasiginali we-SSB-SC angenziwa ngezindlela ezimbili kanje:

- Indlela yokubandlulula imvamisa noma indlela yokuhlunga.

- Indlela yokubandlulula ngokwesigaba noma indlela ye-phase-shift.

 

IMIGOMO YENCWADI

1. Ukushintshwa kwe-amplitude: Ukushintshashintsha kwegagasi ngokushintsha ubukhulu balo, okusetshenziswe ikakhulukazi njengendlela yokusakaza isignali yomsindo ngokuyihlanganisa negagasi elithwala umsakazo.

 

2. Inkomba yokushintshashintsha: (ukujula kokumodela) kwesikimu sokumodula kuchaza ukuthi ukuhluka okushintshiwe kwesiginali yenkampani yenethiwekhi kuhluka kangakanani ezingeni layo elingashintshiwe.

 

3. I-Narrowband FM: Uma inkomba yokushintshashintsha kwe-FM igcinwa ngaphansi koku-1, khona-ke i-FM ekhiqizwayo ithathwa njengeqembu elincane le-FM.

 

4. Ukushintshwa kwemvamisa (FM): umbhalo wekhodi wolwazi kugagasi lenkampani yenethiwekhi ngokushintsha imvamisa esheshayo yegagasi.

 

5. Ukulinganisa: Izinga likhethwa ngokucophelela ukuze lingalayishi kakhulu isihlanganisi lapho amasiginali aqinile ekhona, kodwa lenza amasiginali akhuliswe ngokwanele ukuze kuqinisekiswe ukuthi isignali enhle kusilinganiso somsindo siyafinyelelwa.

 

6. Ukushintshashintsha kwezwi: Inqubo lapho ezinye zezici ze-wave yenkampani yenethiwekhi zihluka ngokuhambisana nesignali yomlayezo.

Uyini umehluko phakathi komsakazo we-SW, MW kanye noFM?

I-Shortwave (SW)

Irediyo ye-Shortwave inobubanzi obukhulu - ingatholwa izinkulungwane zamakhilomitha ukusuka ku-transmitter, futhi ukuhanjiswa kungawela ulwandle nezintaba. Lokhu kwenza kube kuhle ukufinyelela emazweni angenayo inethiwekhi yomsakazo noma lapho ukusakazwa kobuKristu kungavunyelwe khona. Kalula nje, umsakazo we-shortwave weqa imingcele, noma ngabe iyindawo noma yezepolitiki. Ukuthunyelwa kwe-SW kulula ukukwamukela, futhi: ngisho nemisakazo eshibhile, elula iyakwazi ukuthatha isignali.

 

 amabhendi wefrikhwensi yomsakazo we-infographic

 

Amandla erediyo ye-shortwave ayenza ifaneleke kahle indawo kaFeba agxile kuyo e Kushushiswa Bandla. Isibonelo, ezindaweni zaseNyakatho-mpumalanga ye-Afrika lapho ukusakazwa kwezenkolo kuvinjelwe ngaphakathi kwezwe, ozakwethu bendawo bangakha okuqukethwe komsindo, bakuthumele ngaphandle kwezwe futhi bakubuyisele emuva ngokusakazwa kwe-SW ngaphandle kwengozi yokushushiswa.  

 

I-Yemen njengamanje ibhekene nenkinga enkulu futhi enodlame ngengxabano edala isimo esiphuthumayo esikhulu sokusiza abantu. Kanye nokunikeza isikhuthazo esingokomoya, ozakwethu basakaza izinto ezikhuluma ngezindaba zamanje zenhlalo, ezempilo nempilo ngokombono wobuKristu.  

 

Ezweni lapho amaKristu akha u-0.08% kuphela wabantu futhi eshushiswa ngenxa yokholo lwawo, Isonto Lamaqiniso iyisici samasonto onke semizuzu engu-30 somsakazo we-shortwave esisekela amakholwa e-Yemeni ngolimi lwendawo. Abalaleli bangafinyelela ukusakazwa komsakazo okusekelayo ngasese nangokungaziwa.  

 

Indlela enamandla yokufinyelela imiphakathi encishwe amathuba emingceleni, i-shortwave iphumelela kakhulu ekufinyeleleni izethameli ezikude ngeVangeli futhi, ezindaweni lapho amaKristu ashushiswa khona, ishiya abalaleli nabasakazi bekhululekile ekwesabeni ukuphindiselwa. 

Igagasi elimaphakathi (MW)

Irediyo ye-Medium-wave ivamise ukusetshenziselwa ukusakazwa kwendawo futhi ilungele imiphakathi yasemakhaya. Ngobubanzi bokudlulisa obuphakathi, ingafinyelela ezindaweni eziqhelile ngesignali eqinile, ethembekile. Amagagasi amaphakathi angasakazwa ngamanethiwekhi omsakazo asunguliwe - lapho la manethiwekhi ekhona.  

 

Owesifazane waseNdiya ulalela umsakazo

 

In enyakatho yeNdiya, izinkolelo zamasiko zendawo zishiya abesifazane bebandlululwa futhi abaningi bavalelwe emakhaya abo. Kwabesifazane abakulesi simo, ukuhanjiswa okuvela ku-Feba North India (kusetshenziswa inethiwekhi yomsakazo esunguliwe) kuwukuxhumana okubalulekile nomhlaba wangaphandle. Izinhlelo zayo ezisekelwe kumagugu zihlinzeka ngemfundo, isiqondiso sokunakekelwa kwezempilo kanye nemibono ngamalungelo abantu besifazane, okwenza kube nezingxoxo mayelana nengokomoya nabesifazane abathintana nesiteshi. Kulesi simo, umsakazo uletha umyalezo wethemba nokunika amandla kwabesifazane abalalele emakhaya.   

Ukushintshwa Kwemvamisa (FM)

Esiteshini somsakazo esizinze emphakathini, i-FM iyinkosi! 

 

Onjiniyela phezulu - Umoja FM

 

Umsakazo Umoja FM e-DRC esanda kwethulwa, okuhloswe ngayo ukunikeza umphakathi izwi. I-FM ihlinzeka ngesignali yebanga elifushane - ngokuvamile kunoma yikuphi lapho ubona khona umthumeli, ngekhwalithi yomsindo enhle kakhulu. Ngokuvamile ingamboza indawo yedolobha elincane noma idolobhana elikhulu - iyenze ifaneleke kakhulu esiteshini somsakazo esigxile endaweni elinganiselwe ekhuluma ngezindaba zendawo. Nakuba iziteshi zamagagasi amafushane namagagasi aphakathi zingabiza ukuzisebenza, ilayisense yesiteshi somsakazo esizinze emphakathini ishibhe kakhulu. 

 

I-Aafno FM isakaza estudiyo sepotimende

 

Afno FM, uzakwethu ka-Feba e-Nepal, uhlinzeka ngezeluleko zokunakekelwa kwezempilo ezibalulekile emiphakathini yasendaweni yase-Okhaldhunga naseDadeldhura. Ukusebenzisa i-FM kubavumela ukuthi badlulise ulwazi olubalulekile, ngokucacile, ezindaweni ezihlosiwe. Ezindaweni zasemakhaya zaseNepal, kunezinsolo ezisabalele ngezibhedlela kanti ezinye izimo zezempilo ezijwayelekile zibonwa njengezingamukelekile. Kunesidingo sangempela sezeluleko zezempilo ezinolwazi, ezingahluleli futhi Afno FM isiza ukuhlangabezana nalesi sidingo. Ithimba lisebenza ngokubambisana nezibhedlela zendawo ukuvimbela nokwelapha izinkinga zempilo ezivamile (ikakhulukazi lezo ezinenhlamba ehambisana nazo) kanye nokubhekana nokwesaba kwabantu bendawo ochwepheshe bezokunakekelwa kwempilo, likhuthaza abalaleli ukuthi bafune ukwelashwa esibhedlela lapho beludinga. I-FM iphinde isetshenziswe emsakazweni impendulo ephuthumayo - nesidlulisi se-FM esingu-20kg silula ngokwanele ukusiyisa emiphakathini ekhahlamezekile njengengxenye yesitudiyo sepotimende esithuthwa kalula. 

Umsakazo we-Intanethi

Ukuthuthukiswa okusheshayo kobuchwepheshe obusekelwe kuwebhu kunikeza amathuba amakhulu okusakazwa komsakazo. Iziteshi ezisekelwe ku-inthanethi ziyashesha futhi kulula ukuzisetha (kwesinye isikhathi kuthatha isikhathi esincane njengeviki ukuvuka nokusebenza! Kungabiza kancane kakhulu kunokuthunyelwa okuvamile.

 

Umuntu ulalela ku-inthanethi iRadio Voice e-Egypt 

Futhi ngenxa yokuthi i-inthanethi ayinayo imingcele, izethameli zomsakazo ezisekelwe kuwebhu zingafinyelela umhlaba wonke. Okunye okusibuyisela emuva ukuthi umsakazo we-inthanethi uncike ekusakazweni kwe-inthanethi nasekufinyeleleni komlaleli kukhompuyutha noma i-smartphone.  

 

Ezweni labantu abayizigidi eziyizinkulungwane ezingu-7.2, abathathu kwabahlanu, noma abayizigidi eziyizinkulungwane ezingu-4.2, abakabi nayo njalo i-Internet. Ngakho-ke amaphrojekthi omsakazo womphakathi asekelwe ku-inthanethi awafanele okwamanje kwezinye zezindawo ezimpofu kakhulu nezingafinyeleleki kakhulu emhlabeni.

Iyini i-SW ne-MW?
Igama elithi "shortwave" laqalwa ekuqaleni komsakazo ekuqaleni kwekhulu lama-20, lapho i-spectrum yomsakazo ihlukaniswa ngamagagasi amade (LW), amagagasi aphakathi nendawo (MW), nama-short wave (SW) amabhendi asuselwa kubude begagasi. .
Ingabe i-AM ne-MW ziyefana?
I-AM, okusho ukuthi i-Amplitude Modulation (AM) iwuhlelo oludala kakhulu lokusakaza umsakazo e-UK. Igama elithi AM livame ukusetshenziswa ukumboza womabili amagagasi amaphakathi (MW) kanye namagagasi amade (LW).
Uyini umehluko phakathi kwe-shortwave ne-medium wave?
Ngokubonisa okukodwa noma ngaphezulu phakathi komhlaba ne-ionosphere, isignali yomsakazo wegagasi elifushane ingatholwa ebangeni elide ukusuka kusidlulisi. Futhi i-medium wave noma i-mediumwave (MW) iyingxenye yebhendi yomsakazo we-Medium frequency (MF) esetshenziselwa ukusakaza kwe-AM.
Ingabe irediyo ye-AM ishortwave?
Ibizwa ngokuthi i-shortwave ngoba, ngokwezwi nezwi, amagagasi akhishwayo mafushane ngokungafani namagagasi amade namagagasi aphakathi nendawo, asetshenziswa umsakazo we-AM, kanye ne-wideband VHF (imvamisa ephezulu kakhulu) esetshenziswa umsakazo we-FM. Lawa maza amafushane angahamba izinkulungwane zamakhilomitha emhlabeni jikelele, ngakho umsakazo we-shortwave, ngokwemvelo, ungowomhlaba wonke.
Ingabe irediyo ye-AM iyafana negagasi elimaphakathi?
Amasiginali we-Medium wave (MW) asakazwa kusetshenziswa i-amplitude modulation (AM) futhi amagama asetshenziswa ngokushintshana. Amasiginali we-FM asakazwa kakhulu kumabhendi amafrikhwensi aphezulu kakhulu (VHF) noma ama-Ultra high frequency (UHF) futhi asetshenziselwa ukusakaza kwezwi (umsakazo) kanye nokusakaza kwevidiyo (i-TV).
Lithini ibanga lokuvama le-AM?
Ibhendi ye-AM e-United States ivala amafrikhwensi ukusuka ku-540 kHz ukuya ku-1700 kHz, ngezinyathelo ezingu-10 kHz (540, 550, 560 ... 1680, 1690, 1700). I-530 kHz e-United States ayitholakaleli ukusetshenziswa kokusakaza, kodwa ibekelwe ukusetshenziswa Kweziteshi Zolwazi Lwabahambi ezinamandla kakhulu.

Kungani kusasetshenziswa umsakazo we-AM?

I-Amplitude modulation (AM) iyindlela endala kakhulu yokuguquguquka eyaziwayo. Iziteshi zokuqala zokusakaza bekuyi-AM, kodwa nangaphambilini, i-CW noma amasiginali wamaza aqhubekayo anekhodi ye-Morse bekuwuhlobo lwe-AM. Yilokho esikubiza ngokuthi i-on-off keying (OOK) noma i-amplitude-shift keying (ASK) namuhla.

 

Noma i-AM ingeyokuqala nendala kakhulu, isekhona ngezindlela eziningi kunalokho ongase ucabange. I-AM ilula, ibiza kancane, futhi isebenza ngendlela emangalisayo. Yize isidingo sedatha enesivinini esikhulu sisiqhubele ku-orthogonal frequency-division multiplexing (OFDM) njengohlelo lokumodela olusebenza kahle kakhulu, i-AM isabambe iqhaza ohlotsheni lwe-quadrature amplitude modulation (QAM).

 

Yini engenze ngacabanga nge-AM? Phakathi nesiphepho esikhulu sasebusika sezinyanga ezimbili noma ngaphezulu ezedlule, ngathola iningi lesimo sami sezulu nolwazi oluphuthumayo eziteshini zendawo ze-AM. Ikakhulukazi evela ku-WOAI, isiteshi esingu-50-kW osekuyiminyaka sikhona. Ngiyangabaza ukuthi bebesakhipha amandla angu-50 kW ngesikhathi kunqamuka ugesi, kodwa bebesemoyeni ngesikhathi sonke isimo sezulu. Iziteshi eziningi noma eziningi ze-AM bezivuliwe futhi zisebenza ngamandla ayisipele. Uthembekile futhi uyaduduza.

 

Kuneziteshi ezingaphezu kuka-6,000 AM e-US namuhla. Futhi basenezithameli eziningi zabalaleli, ngokuvamile abantu bendawo abafuna isimo sezulu sakamuva, ithrafikhi, nolwazi lwezindaba. Abaningi basalalela ezimotweni zabo noma emalolini. Kunezinhlobo eziningi zezinhlelo zerediyo zezingxoxo futhi usengawuzwa umdlalo we-baseball noma webhola lezinyawo ku-AM. Izinketho zomculo zinciphile, njengoba iningi labo selithuthele ku-FM. Nokho, kuneziteshi zomculo zezwe kanye neTejano ku-AM. Konke kuncike ezilalelini zendawo, ezihluke kakhulu.

 

Umsakazo we-AM usakaza ngamashaneli abanzi angu-10-kHz phakathi kuka-530 no-1710 kHz. Zonke iziteshi zisebenzisa imibhoshongo, ngakho-ke i-polarization iqondile. Emini, ukusakazeka ikakhulukazi kungamaza aphansi anobubanzi obungamakhilomitha ayi-100. Ngokwengxenye enkulu, kuncike ezingeni lamandla, ngokuvamile i-5 kW noma i-1 kW. Azikho iziteshi eziningi ezingu-50-kW, kodwa ububanzi bazo ngokusobala bukude kakhulu.

 

Ebusuku, vele, ukusakazeka kuyashintsha njengoba izingqimba ze-ionized zishintsha futhi zenza amasignali ahambele kude kakhulu ngenxa yekhono lawo lokuphikiswa yizingqimba ze-ion ezingaphezulu ukukhiqiza ama-hop amaningi esignali ebangeni eliya kumamayela ayinkulungwane noma ngaphezulu. Uma unomsakazo omuhle we-AM kanye ne-antenna ende ungalalela iziteshi ezweni lonke ebusuku.

 

I-AM futhi iwukushintshwa okuyinhloko komsakazo we-short-wave, ongawuzwa emhlabeni wonke ukusuka ku-5 ukuya ku-30 ​​MHz. Kusengomunye wemithombo eyinhloko yolwazi emazweni amaningi omhlaba wesithathu. Ukulalela igagasi elifushane nakho kuhlala kuwukuzilibazisa okudumile.

 

Ngaphandle kokusakaza, i-AM isasetshenziswa kuphi? Umsakazo we-Ham usasebenzisa i-AM; hhayi kufomu lokuqala lezinga eliphezulu, kodwa njengebhande eliseceleni elilodwa (SSB). I-SSB iyi-AM enenkampani yenethiwekhi ecindezelwe futhi ibhande elilodwa laseceleni lihlungiwe, kushiya umzila wezwi omncane ongu-2,800-Hz. Isetshenziswa kabanzi futhi isebenza kahle kakhulu, ikakhulukazi kumabhendi we-ham kusuka ku-3 kuye ku-30 ​​MHz. Amasosha kanye neminye imisakazo yasolwandle iyaqhubeka nokusebenzisa uhlobo oluthile lwe-SSB, futhi.

 

Kodwa linda, akugcini lapho. I-AM isatholakala emisakazweni ye-Citizen's Band. I-AM yakudala ihlala ikumxube, njengoba kwenza ne-SSB. Ngaphezu kwalokho, i-AM iwukushintshwa okuyinhloko komsakazo wendiza osetshenziswa phakathi kwezindiza nombhoshongo. Le misakazo isebenza kubhendi engu-118- kuya ku-135-MHz. Kungani AM? Angikaze ngikuthole lokho, kodwa kusebenza kahle.

 

Okokugcina, i-AM isekanye nathi ngefomu le-QAM, inhlanganisela yokuguquguquka kwesigaba kanye ne-amplitude. Iziteshi eziningi ze-OFDM zisebenzisa uhlobo olulodwa lwe-QAM ukuze zithole amanani edatha aphezulu ezingalethwa.

 

Noma kunjalo, i-AM ayikakafi, futhi empeleni ibonakala Iguga Ngokumangalisayo.

Iyini i-AM Transmitter futhi Isebenza kanjani?

Iyini i-AM Transmitter?

Ama-transmitter adlulisa amasignali e-AM aziwa ngokuthi ama-AM transmitter, abuye aziwe ngokuthi yi-AM radio transmitter noma i-AM broadcast transmitter, ngoba asetshenziselwa ukudlulisa amasignali omsakazo esuka kolunye uhlangothi aye kolunye.

 

I-FMUSER solid-state 1000 watt AM transmitter-blue background-700 pixels.png

 

Lawa ma-transmitters asetshenziswa kuma-wave wave aphakathi nendawo (MW) kanye namabhendi efrikhwensi yamagagasi amafushane (SW) okusakazwa kwe-AM.

 

Ibhendi ye-MW inefrequency ephakathi kuka-550 KHz no-1650 KHz, futhi ibhendi ye-SW inamaza asuka ku-3 MHz kuya ku-30 ​​MHz. Izinhlobo ezimbili zama-AM transmitters asetshenziswa ngokususelwe emandleni awo okudlulisa yilezi:

 

  • Izinga eliphakeme
  • Izinga eliphansi

 

Ama-transmitters asezingeni eliphezulu asebenzisa ukuguquguquka kwezinga eliphezulu, kanti ama-transmitters asezingeni eliphansi asebenzisa ukuguquguquka kwezinga eliphansi. Ukukhetha phakathi kwezikimu ezimbili zokumodulisa kuncike emandleni okudlulisa wesidluliseli se-AM.

 

Kuma-transmitters okusakaza, lapho amandla okudlulisa engahle abe ngohlelo lwama-kilowatts, kusetshenziswa ukushintshashintsha kwezinga eliphezulu. Kuma-transmitter wamandla aphansi, lapho kudingeka khona ama-watts ambalwa wamandla okudlulisa, kusetshenziswa ukuguquguquka kwezinga eliphansi..

Ama-Transmitter Asezingeni Eliphezulu Nasezingeni Eliphansi

Izibalo ezingezansi zibonisa umdwebo webhlokhi wama-transmitters asezingeni eliphezulu nasezingeni eliphansi. Umehluko oyisisekelo phakathi kwama-transmitter amabili ukukhuliswa kwamandla kwesithwali kanye namasiginali ashintshayo.

Umfanekiso (a) ubonisa umdwebo webhlokhi yesidluliseli sezinga eliphezulu se-AM.

 

Vimba Umdwebo Weleveli Ephezulu Yokuthumela I-AM

 

Umfanekiso (a) udwetshelwe ukudluliselwa komsindo. Ekudluliselweni kwezinga eliphezulu, amandla esithwali namasiginali amodulayo ayakhuliswa ngaphambi kokuwasebenzisa esigabeni semoduli, njengoba kukhonjisiwe kumfanekiso (a). Ekumojulisweni kwezinga eliphansi, amandla amasiginali wokufaka amabili wesiteji semoduli awakhuliswa. Amandla okudlulisa adingekayo atholakala esigabeni sokugcina sesithumeli, isikhulisi samandla sekilasi C.

 

Izigaba ezahlukahlukene zomfanekiso (a) ziyizi:

 

  • I-oscillator yenkampani
  • Isikhulisi sebhafa
  • Imvamisa yokuphindaphinda
  • Isikhulisi samandla
  • Iketango lomsindo
  • Isikhulisi samandla sesigaba C esishintshiwe

I-Carrier Oscillator

I-oscillator yenkampani yenethiwekhi ikhiqiza isignali yenkampani yenethiwekhi, esebangeni le-RF. Imvamisa yesithwali ihlala iphezulu kakhulu. Ngenxa yokuthi kunzima kakhulu ukukhiqiza ama-frequency aphezulu ngokuzinza okuhle kwe-frequency, i-oscillator yenkampani yenethiwekhi ikhiqiza i-sub multiple nge-frequency carrier edingekayo.

 

Le frikhwensi encane iphindaphindwa yisigaba sokuphindaphinda imvamisa ukuze uthole imvamisa yenkampani yenethiwekhi edingekayo.

 

Ngaphezu kwalokho, i-crystal oscillator ingasetshenziswa kulesi sigaba ukukhiqiza isithwali sefrikhwensi ephansi ngokuzinza kwamafrikhwensi okuhle kakhulu. Isigaba sokuphindaphinda imvamisa sibe sesinyusa imvamisa yenkampani yenethiwekhi inani layo elidingekayo.

I-Buffer Amplifier

Inhloso ye-buffer amplifier iphindwe kabili. Iqala ngokufanisa i-impedance yokuphuma kwe-oscillator yenkampani yenethiwekhi ne-impedance yokufaka ye-multiplier frequency, isigaba esilandelayo se-oscillator yenkampani yenethiwekhi. Bese ihlukanisa i-oscillator yenethiwekhi kanye nesiphindaphinda samaza.

 

Lokhu kuyadingeka ukuze isiphindaphinda singadonsi i-current enkulu ku-oscillator yenethiwekhi. Uma lokhu kwenzeka, imvamisa ye-oscillator yenkampani yenethiwekhi ngeke ihlale izinzile.

I-Frequency Multiplier

I-sub-multiple frequency yesignali yenkampani yenethiwekhi, ekhiqizwe i-oscillator yenkampani yenethiwekhi, manje isetshenziswa kusiphindaphinda imvamisa ngesikhulisi sebhafa. Lesi sigaba saziwa nangokuthi i-harmonic generator. Isiphindaphinda samafrikhwensi sikhiqiza ama-harmonic aphezulu we-oscillator oscillator frequency. Ukuphindaphinda amafrikhwensi kuyisekethe eshuniwe engashunwa imvamisa yenkampani yenethiwekhi edingekayo ezodluliswa.

I-Amplifier yamandla

Amandla esignali yenkampani yenethiwekhi abe esekhuliswa kusiteji sesikhulisi samandla. Lesi yisidingo esiyisisekelo sesidlulisi esisezingeni eliphezulu. Isikhulisi samandla sekilasi C sinikeza amandla aphezulu amandla wamanje wesiginali yenkampani yenethiwekhi ekuphumeni kwaso.

I-Audio Chain

Isignali yomsindo ezodluliswa itholakala kumbhobho, njengoba kukhonjisiwe emfanekisweni (a). I-amplifier yomshayeli womsindo ikhulisa i-voltage yalesi siginali. Lokhu kukhulisa kuyadingeka ukuze ushayele isikhulisi samandla omsindo. Okulandelayo, isikhulisi samandla sekilasi A noma isigaba B sikhulisa amandla esignali yomsindo.

Isikhulisi Sesikhulisamazwi Esishintshiwe Sekilasi C

Lesi yisigaba sokuphumayo se-transmitter. Isiginali yomsindo eshintshayo kanye nesiginali yenkampani yenethiwekhi, ngemva kokukhulisa amandla, kusetshenziswa kulesi sigaba sokumodela. Ukushintshashintsha kwenzeka kulesi sigaba. Isikhulisi sekilasi C siphinde sikhulise amandla esignali ye-AM emandleni okudlulisela aphinde atholwa. Le signali igcina idluliselwe ku-antenna., ekhipha isignali endaweni yokudlulisela.

 

Vimba Umdwebo Weleveli Ephansi Ye-AM Transmitter

 

Isidluliseli sezinga eliphansi le-AM esiboniswe emfanekisweni (b) sifana nesidlulisi sezinga eliphezulu, ngaphandle kokuthi amandla enkampani yenethiwekhi namasignali omsindo awakhuliswanga. Lezi zibonakaliso ezimbili zisetshenziswa ngokuqondile ku-modulated class amplifier yamandla.

 

Ukushintshashintshashintsha kwenzeka esiteji, futhi amandla esignali eshintshiwe akhuliswa abe sezingeni elidingekayo lamandla okudlulisa. I-antenna idlulisela isignali.

Ukuhlanganisa Isiteji Sokukhipha Kanye Ne-Antenna

Isigaba sokukhiphayo sesikhulisi samandla sesigaba C esishintshiwe sondla isiginali ku-antenna edlulisayo.

 

Ukuze udlulise amandla amakhulu ukusuka esigabeni esikhiphayo uye othini kuyadingeka ukuthi ukuvimba kwezigaba ezimbili kufane. Kulokhu, inethiwekhi efanayo iyadingeka.

 

Ukumatanisa phakathi kwakho kokubili kufanele kuphelele kuwo wonke amaza okudlulisa. Njengoba ukufanisa kudingekile kumafrikhwensi ahlukene, ama-inductors nama-capacitor anikeza i-impedance ehlukene kumafrikhwensi ahlukene asetshenziswa kumanethiwekhi afanayo.

 

Inethiwekhi ehambisanayo kufanele yakhiwe kusetshenziswa lezi zingxenye ze-passive. Lokhu kukhonjiswe kuMfanekiso ongezansi (c).

 

I-Double Pi Matching Network

 

Inethiwekhi yokufanisa esetshenziselwa ukuhlanganisa isigaba sokuphumayo sesidlulisi kanye nothi olubizwa ngokuthi i-double π-network.

 

Le nethiwekhi iboniswa kumfanekiso (c). Iqukethe ama-inductors amabili, i-L1 ne-L2 kanye nama-capacitor amabili, i-C1 ne-C2. Amanani alezi zingxenye akhethwa ngendlela yokuthi i-impedance yokufaka yenethiwekhi phakathi kuka-1 no-1'. Okuboniswe emfanekisweni (c) kufaniswe nokukhinyabezeka kokuphumayo kwesigaba sokukhiphayo sesidlulisi.

 

Ngaphezu kwalokho, i-impedance yokuphuma kwenethiwekhi ifaniswa nokuvinjelwa kwe-antenna.

 

​Inethiwekhi ehambisanayo engu-π iphinda ihlunge izingxenye zefrikhwensi ezingafuneki ezivela ekuphumeni kwesigaba sokugcina sesithumeli.

 

Okukhiphayo kwesikhulisi samandla sesigaba C esishintshiwe singaqukatha ama-harmonic aphezulu, afana nama-harmonics wesibili nowesithathu, angafuneki kakhulu.

 

Impendulo yemvamisa yenethiwekhi efanayo isethwe ngendlela yokuthi lawa ma-harmonic aphezulu angafuneki acindezelwe ngokuphelele, futhi isignali oyifunayo kuphela ehlanganiswe nothi..

I-AM noma i-FM Transmitter? Umehluko Oyinhloko 

I-antenna ekhona ekugcineni kwesigaba sokudlulisa, idlulisa igagasi elenziwe ngemoduli. Kulesi sahluko, ake sixoxe ngabadlulisi be-AM ne-FM.

I-AM Transmitter

Isidlulisi se-AM sithatha isignali yomsindo njengokokufaka bese sihambisa amagagasi we-amplitude modulated kwi-antenna njengokukhipha okufanele kudluliswe. Umdwebo webhulokhi wesidlulisi se-AM uboniswa kulesi sibalo esilandelayo.

 

 

Ukusebenza kwe-AM transmitter kungachazwa kanje: 

 

  • Isiginali yomsindo ephuma ekukhipheni kombhobho ithunyelwa ku-pre-amplifier, ekhulisa izinga lesignali yokuguqula.
  • I-RF oscillator yakha isignali yenethiwekhi.
  • Kokubili i-modulating kanye nesiginali yenethiwekhi kuthunyelwa ku-modulator ye-AM.
  • Isikhulisi samandla sisetshenziselwa ukwandisa amazinga wamandla we-AM wave. Leli gagasi ekugcineni lidluliselwa ku-antenna elizodluliselwa.

I-FM Transmitter

Isidlulisi se-FM iyunithi yonke, ethatha isignali yomsindo njengokokufaka bese ihambisa igagasi le-FM kwi-antenna njengokukhipha okufanele kudluliswe. Umdwebo webhulokhi wesidlulisi se-FM uboniswa kulo mfanekiso olandelayo.

 

 

Ukusebenza komsakazo we-FM kungachazwa kanje:

 

  • Isiginali yomsindo ephuma ekukhipheni kombhobho ithunyelwa ku-pre-amplifier, ekhulisa izinga lesignali yokuguqula.
  • Lesi siginali sidluliselwa kusihlungi esiphakeme, esisebenza njengenethiwekhi yokugcizelela kwangaphambili ukuhlunga umsindo nokwenza ngcono isignali kunani lomsindo.
  • Lesi siginali sidluliselwa esifundeni se-modulator ye-FM.
  • Isifunda se-oscillator sakha isithwali semvamisa esiphezulu, esithunyelwa ku-modulator kanye nesiginali yokuguqula.
  • Kusetshenziswa izigaba eziningana zokuphindaphinda kwemvamisa ukukhulisa imvamisa yokusebenza. Noma kunjalo, amandla esignali awanele ukudlulisa. Ngakho-ke, i-RF power amplifier isetshenziswa ekugcineni ukukhulisa amandla esignali ehleliwe. Lokhu kukhishwa okulungisiwe kwe-FM ekugcineni kudluliselwa ku-antenna okufanele kudluliswe.
I-AM noma i-FM: Ungalukhetha Kanjani Isistimu Yokusakaza Engcono Kakhulu?

Ukuqhathaniswa kwezimpawu ze-AM ne-FM

Kokubili uhlelo lwe-AM nolwe-FM lusetshenziswa ezinhlelweni zezohwebo nezingezona ezohwebo. Njengokusakazwa komsakazo kanye nokudluliswa kwethelevishini. Isistimu ngayinye inobuhle bayo kanye nobubi bayo. Ohlelweni Olukhethekile, uhlelo lwe-AM lungafaneleka kakhulu kunohlelo lwe-FM. Ngakho kokubili kubaluleke ngokulinganayo ngokombono wesicelo.

Ubuhle bezinhlelo ze-FM ngaphezu kwe-AM Systems

I-amplitude yegagasi le-FM ihlala injalo. Lokhu kunikeza abaklami bohlelo ithuba lokususa umsindo kusiginali eyamukelwe. Lokhu kwenziwa kubamukeli be-FM ngokusebenzisa i-amplitude limiter circuit ukuze umsindo ongaphezu komkhawulo we-amplitude ucindezelwe. Ngakho-ke, uhlelo lwe-FM lubhekwa njengesistimu yokuzivikela enomsindo. Lokhu akwenzeki ezinhlelweni ze-AM ngoba isiginali ye-baseband iphathwa ukuhluka kwe-amplitude ngokwayo futhi imvilophu yesiginali ye-AM ayikwazi ukuguqulwa.

 

Amandla amaningi esignali ye-FM aphathwa amabhendi aseceleni. Ngamanani aphezulu wenkomba yokushintshashintsha, i-mc, ingxenye enkulu yamandla aphelele equkethwe amabhendi aseceleni, futhi isignali yenkampani yenethiwekhi iqukethe amandla amancane. Ngokuphambene, ohlelweni lwe-AM, ingxenye eyodwa kwezintathu kuphela yamandla aphelele iphathwa amabhendi aseceleni futhi izingxenye ezimbili kwezintathu zamandla aphelele zilahleka ngendlela yamandla enkampani yenethiwekhi.

 

- Ezinhlelweni ze-FM, amandla esiginali edlulisiwe ancike ku-amplitude yesiginali yenkampani yenethiwekhi engashintshiwe, futhi yingakho ihlala njalo. Ngokuphambene, ezinhlelweni ze-AM, amandla ancike kunkomba yokumodulation ma. Amandla aphezulu avumelekile kumasistimu e-AM angamaphesenti angu-100 uma i-ma ingubunye. Ukuvinjelwa okunjalo akusebenzi ezimeni zezinhlelo ze-FM. Lokhu kungenxa yokuthi amandla esewonke ohlelweni lwe-FM azimele kunkomba yokushintshashintsha, mf kanye nokuchezuka kwefrequency fd. Ngakho-ke, ukusetshenziswa kwamandla kuhle kakhulu ohlelweni lwe-FM.

 

Kuhlelo lwe-AM, okuwukuphela kwendlela yokunciphisa umsindo ukukhulisa amandla esignali adlulisiwe. Lo msebenzi unyusa izindleko zesistimu ye-AM. Ohlelweni lwe-FM, ungakwazi ukwandisa ukuchezuka kwefrikhwensi kusiginali yenkampani yenethiwekhi ukuze unciphise umsindo. uma ukuchezuka kwemvamisa kuphezulu, khona-ke ukuhluka okuhambisanayo ku-amplitude yesiginali ye-baseband kungabuyiswa kalula. uma ukuchezuka kwefrikhwensi kukuncane, umsindo 'ungasibekela lokhu kuhluka futhi ukuchezuka kwefrikhwensi akukwazi ukuhunyushwa ekuhlukeni kwe-amplitude okuhambisanayo. Ngakho-ke, ngokwandisa ukuphambuka kwemvamisa kusignali ye-FM, umphumela womsindo angawunciphisa. Akukho ukuhlinzekwa ohlelweni lwe-AM lokunciphisa umsindo nganoma iyiphi indlela, ngaphandle kokukhulisa amandla alo adlulisiwe.

 

Kusignali ye-FM, iziteshi ze-FM eziseduze zihlukaniswa ngamabhendi onogada. Ohlelweni lwe-FM akukho ukudluliswa kwamasignali ngesikhala se-spectrum noma ngebhendi yonogada. Ngakho-ke, akukho ukuphazamiseka kweziteshi eziseduze ze-FM. Nokho, ohlelweni lwe-AM, alikho ibhande lonogada elinikeziwe phakathi kweziteshi ezimbili ezincikene. Ngakho-ke, kuhlale kunokuphazamiseka kweziteshi zomsakazo ze-AM ngaphandle uma isignali eyamukelwe iqine ngokwanele ukucindezela isignali yesiteshi esiseduze.

Ububi bezinhlelo ze-FM ngezinhlelo ze-AM

Kunenombolo engapheli yamabhendi aseceleni kusignali ye-FM ngakho-ke umkhawulokudonsa wethiyori wohlelo lwe-FM awunamkhawulo. Umkhawulokudonsa wesistimu ye-FM unqunyelwe umthetho kaCarson, kodwa usephezulu kakhulu, ikakhulukazi ku-WBFM. Ezinhlelweni ze-AM, i-bandwidth iphindwe kabili kuphela i-modulation frequency, engaphansi kakhulu kunaleyo ye-WBFN. Lokhu kwenza amasistimu e-FM abize kunezinhlelo ze-AM.

 

Imishini yohlelo lwe-FM iyinkimbinkimbi kakhulu kunezinhlelo ze-AM ngenxa yokujikeleza okuyinkimbinkimbi kwezinhlelo ze-FM; lesi ngesinye isizathu esenza ukuthi izinhlelo ze-FM zingabizi kakhulu izinhlelo ze-AM.

 

Indawo yokwamukela i-FM incane kunohlelo lwe-AM ngenxa yalokho iziteshi ze-FM zivinjelwe ezindaweni zasemadolobheni kuyilapho iziteshi zomsakazo ze-AM zitholwa noma kuphi emhlabeni. Uhlelo lwe-FM ludlulisa amasignali ngomugqa wokubona, lapho ibanga phakathi kothi lokudlulisa nokwamukela kungafanele libe liningi. ohlelweni lwe-AM amasignali eziteshi zebhendi yamaza amafushane asakazwa ngezendlalelo zomkhathi ezibonisa amaza omsakazo endaweni ebanzi.

Yiziphi Izinhlobo Ezihlukile Zama-AM Transmitters?

Ngenxa yokusetshenziswa okuhlukile, i-AM Transmitter ihlukaniswe kabanzi yaba i-AM Transmitter (i-DIY namandla aphansi ama-AM transmitter) kanye ne-AM Transmitter yezentengiso (yomsakazo wezempi noma umsakazo we-AM kazwelonke).

 

I-Commercial AM Transmitter ingenye yemikhiqizo emele kakhulu emkhakheni we-RF. 

 

Lolu hlobo lomsakazi wesiteshi somsakazo lungasebenzisa izimpondo zalo ezinkulu zokusakaza ze-AM (i-guyed mast, njll.) ukusakaza amasiginali emhlabeni jikelele. 

 

Ngenxa yokuthi i-AM ayikwazi ukuvinjwa kalula, isidluliseli se-AM sezentengiso sivamise ukusetshenziselwa inkulumo-ze yezepolitiki noma inkulumo-ze yamasu ezempi phakathi kwezwe.

 

Ngokufanayo nesidlulisi sokusakaza se-FM, isidlulisi sokusakaza se-AM siphinde siklanywe ngokuphuma kwamandla ahlukene. 

 

Uma sithatha i-FMUSER njengesibonelo, uchungechunge lwabo lwezentengiso lwe-AM transmitter luhlanganisa i-1KW AM transmitter, 5KW AM transmitter, 10kW AM transmitter, 25kW AM transmitter, 50kW AM transmitter, 100kW AM transmitter, kanye ne-200kW AM transmitter. 

 

Lawa ma-transmitters e-AM akhiwe yikhabhinethi yesimo esiqinile eyenziwe nge-gilt, futhi anezinhlelo zokulawula kude ze-AUI kanye nedizayini yezingxenye zemodular, esekela ukuphuma okuqhubekayo kwezimpawu ze-AM zekhwalithi ephezulu.

 

Kodwa-ke, ngokungafani nokwakhiwa kwesiteshi somsakazo we-FM, ukwakha isiteshi somsakazo we-AM kubiza izindleko eziphezulu. 

 

Kubasakazi, ukuqala isiteshi esisha se-AM kuyabiza, okuhlanganisa:

 

- Izindleko zokuthenga nokuthuthwa kwemishini yomsakazo we-AM. 

- Izindleko zokuqashwa kwabasebenzi kanye nokufakwa kwemishini.

- Izindleko zokusebenzisa amalayisense okusakaza e-AM.

- Nj. 

 

Ngakho-ke, eziteshini zomsakazo zikazwelonke noma zamasosha umphakeli onokwethenjelwa onezixazululo zokuma okukodwa udingeka ngokuphuthumayo kulokhu kunikezwa kwemishini yokusakaza ye-AM elandelayo:

 

Amandla aphezulu we-AM Transmitter (amakhulu ezinkulungwane zamandla aphumayo afana ne-100KW noma 200KW)

Uhlelo lwe-antenna lokusakaza lwe-AM (i-antenna ye-AM nombhoshongo womsakazo, izesekeli ze-antenna, imigqa yokudlulisela eqinile, njll.)

Imithwalo yokuhlola ye-AM nezinsizakusebenza. 

Njll

 

Ngokuqondene nabanye abasakazi, isixazululo sezindleko eziphansi sikhanga kakhulu, isibonelo:

 

- Thenga i-AM Transmitter enamandla aphansi (njenge-1kW AM Transmitter)

- Thenga i-AM Broadcast transmitter esetshenzisiwe

- Ukuqasha umbhoshongo womsakazo we-AM osuvele ukhona

- Nj.

 

Njengomkhiqizi onochungechunge oluphelele lokuhlinzeka ngemishini yesiteshi somsakazo we-AM, i-FMUSER izosiza ukudala isixazululo esingcono kakhulu ukusuka ekhanda kuye ozwaneni ngokwesabelomali sakho, ungathola imishini yesiteshi somsakazo we-AM ephelele evela kumsakazo onamandla aphezulu we-AM kuya kumthwalo wokuhlola we-AM neminye imishini. , chofoza lapha ukuze ufunde kabanzi mayelana nezixazululo zomsakazo we-FMUSER AM.

 

I-Civil AM Transmitter ivame kakhulu kune-commercial AM Transmitter njengoba inezindleko eziphansi.

 

Zingahlukaniswa kakhulu zibe isidluliseli se-DIY AM kanye nesidlulisi samandla aphansi we-AM. 

 

Kuma-transmitters e-DIY AM, abanye abathanda umsakazo bavamise ukusebenzisa ibhodi elilula ukushisela izingxenye ezifana nokulalelwayo, i-antenna, i-transformer, i-oscillator, intambo yamandla kanye nolayini ophansi.

 

Ngenxa yomsebenzi wayo olula, i-DIY AM transmitter ingaba nosayizi wengxenye yesundu kuphela. 

 

Kungakho lolu hlobo lwesidluliseli se-AM lubiza amadola ayishumi nambili kuphela, noma lungenziwa mahhala. Ungakwazi ukulandela ngokuphelele ividiyo yokufundisa eku-inthanethi ukuya ku-DIY eyodwa.

 

Amandla aphansi ama-AM transmitters athengiswa ngama- $100. Zivame uhlobo lwama-rack noma zivela ebhokisini lensimbi elincane elingunxande. Lawa ma-transmitters ayinkimbinkimbi kakhulu kune-DIY AM transmitters futhi anabahlinzeki abaningi abancane.

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    I-FMUSER INTERNATIONAL GROUP LIMITED.

    Sihlala sinikeza amakhasimende ethu imikhiqizo ethembekile nezinsizakalo ezicabangelayo.

    Uma ungathanda ukuxhumana nathi ngqo, sicela uye ku Xhumana nathi

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