Ama-VHF Combiners

A VHF inhlanganiselayehla (futhi eyaziwa as a VHF isikhala inhlanganiselayehla) is a idivayisi esetshenziswa kuya hlanganisa amaningi amasignali in the kakhulu high imvamisa (VHF) uhla ku a single isignali. It is ezibalulekile ngoba ukusakaza Iziteshi ngoba it kuvumela amaningi thumelaters kuya share the esifanayo I-antenna, okuyinto ithuthukisa uhlelo ukusebenza kahle futhi ukuthembeka. Lokhu is kuyadingeka in Oda kuya ukwandisa isignali amandla futhi ngcono Ukuhlanganisa Indawo.

Isihlanganisi se-VHF sisetshenziselwa ini?
Izihlanganisi ze-VHF zisetshenziselwa ukuhlanganisa ama-transmitter amaningi nabamukeli ohlelweni olulodwa lwe-antenna. Lokhu kuvumela ukwandisa ukusebenza kahle kanye nokonga izindleko. Izinhlelo zokusebenza ezivame kakhulu zezihlanganisi ze-VHF zifaka ukusakaza, ukuphepha komphakathi kanye nokuxhumana kwezempi, nomsakazo wezimfundamakhwela.
Usisebenzisa kanjani isihlanganisi se-VHF ukusakaza?
1. Qinisekisa ukuthi zonke izimpondo ze-VHF ezixhunywe kusihlanganisi zishunwe kahle futhi zisesimweni esihle.
2. Lungisa ngokucophelela izilungiselelo zokuzuza zesihlanganisi ukuze zifane nokuphumayo kwezimpondo.
3. Gada okukhiphayo kwesihlanganisi ukuze uqinisekise ukuthi amasignali ahlanganiswe kahle futhi noma yikuphi ukuphazamiseka kuyaqedwa.
4. Gwema ukusebenzisa isihlanganisi ezindaweni lapho kungase kube khona ukuphazamiseka okunamandla, njengaseduze kwentambo kagesi.
5. Qiniseka ukuthi noma yiziphi izingxenye ezengeziwe zixhunywe ngokufanelekile, njengezikhulisi noma izihlungi.
6. Hlola njalo ukuxhumana nezilungiselelo zesihlanganisi ukuze uqinisekise ukusebenza kahle.
Sisebenza kanjani isihlanganisi se-VHF?
Isihlanganisi se-VHF iyithuluzi elisetshenziswa eziteshini zokusakaza ukuze kuhlanganiswe amasiginali amaningi asuka kuma-transmitters ahlukene abe kokuphumayo okukodwa. Isebenza ngokuhlanganisa amasignali asuka kuma-transmitter amaningi abe isignali eyodwa, bese isakazwa ngothi olulodwa oluvamile. Lokhu kusiza ukunciphisa inani lezimpondo ezidingekayo ekusakazeni. Kuphinde kusize ekunciphiseni inani lokuphazamiseka okungenzeka kusukela kumasiginali amaningi asakazwa kusukela kuzimpondo eziningi.
Zingaki izinhlobo zezihlanganisi ze-VHF ezikhona futhi yimuphi umehluko phakathi kwazo?
Kunezinhlobo ezintathu eziyinhloko zezihlanganisi ze-VHF: i-passive, i-hybrid, nesebenzayo. Izihlanganisi ze-Passive VHF ziyinketho elula futhi engabizi kakhulu, kodwa zingasetshenziswa kuphela uma wonke amasignali esezingeni elifanayo lamandla. Izihlanganisi ze-Hybrid VHF zingakwazi ukwamukela amasiginali kumazinga ahlukene wamandla, kodwa ziyinkimbinkimbi futhi zibiza kakhulu kunezihlanganisi ezingenzi lutho. Izihlanganisi ze-VHF ezisebenzayo zinikeza izinga eliphezulu lokusebenza, kodwa ziyinketho eyinkimbinkimbi futhi ebiza kakhulu.
Ungasikhetha kanjani isihlanganisi se-VHF esihle kakhulu?
Lapho ukhetha isihlanganisi se-VHF esingcono kakhulu sesiteshi sokusakaza, kubalulekile ukucabangela izici ezimbalwa ezibalulekile. Okokuqala, cabangela usayizi nokucushwa kwesihlanganisi se-VHF, ukuze uqinisekise ukuthi silingana nendawo etholakalayo futhi sizosingatha izimfuneko zesiteshi zamandla nemvamisa. Okwesibili, cabangela ikhwalithi yezingxenye nezinto ezisetshenziswa emkhiqizweni, ukuqinisekisa ukuthi uzomelana nezidingo zesiteshi sokusakaza. Okokugcina, cabangela intengo yomkhiqizo, kanye nanoma yiziphi iziqinisekiso noma iziqinisekiso ezinikezwayo. Kubalulekile futhi ukufunda ukubuyekezwa kwamakhasimende ukuze uthole umqondo ongcono wokuthi umkhiqizo uzokwenza kahle kangakanani ekusebenzeni.
Usixhuma kanjani kahle isihlanganisi se-VHF ohlelweni lokusakaza?
1. Qala ngokuxhuma uthi lwe-antenna kokokufaka kwesihlanganisi se-VHF.
2. Xhuma okukhiphayo kwesihlanganisi kusidlulisi.
3. Xhuma inhlabathi yesihlanganisi emhlabathini wesithumeli.
4. Qiniseka ukuthi zonke izixhumi zivikelekile futhi isihlanganisi sinikwe amandla.
5. Qinisekisa ukuxhunywa ngemitha ye-VSWR noma ezinye izinto zokuhlola ezifanele.
6. Lungisa ama-amplitudes okokufaka nokuphumayo kwesihlanganisi kuya kumazinga afunekayo.
7. Gada ukusebenza kwesihlanganisi nesidlulisi ukuze uqinisekise ukusebenza kahle.
Yiziphi izinto ezisetshenziswayo ezihlobene nesihlanganisi se-VHF?
Imishini ehlobene nesihlanganisi se-VHF esiteshini sokusakaza ihlanganisa: izikhulisamandla ezihlanganisayo, imihlangano yesihlungi, imigqa yokudlulisa, ama-antenna couplers, ama-couplers aqondisayo, nezihlukanisi zamandla.
Yiziphi izici ezibaluleke kakhulu zomzimba neze-RF zesihlanganisi se-VHF?
Izicaciso ezibaluleke kakhulu zomzimba neze-RF zesihlanganisi se-VHF zifaka:
- I-Frequency Range: Isihlanganisi se-VHF kufanele sikwazi ukusebenza kulo lonke ibanga lefrikhwensi ye-VHF (30 MHz – 300 MHz).
- Ukulahlekelwa Kokufaka: Ukulahlekelwa kokufaka kufanele kube kuphansi, ngokuvamile kube ngaphansi kuka-0.5 dB.
- Ukulahlekelwa Kwembuyiselo: Ukulahlekelwa kwembuyiselo kufanele kube phezulu, ngokuvamile kube kukhulu kuno-10 dB.
- Ukuzihlukanisa: Ukuhlukaniswa phakathi kwezimbobo kufanele kube phezulu, ngokuvamile kube kukhulu kuno-30 dB.
- VSWR: I-VSWR kufanele ibe phansi, ngokuvamile ibe ngaphansi kuka-1.5:1.
- Impedance: I-impedance kufanele ibe ngu-50 Ohms.
- Ukuphatha Amandla: Ukuphatha amandla kufanele kwanele kuhlelo lokusebenza.
Usigcina kanjani kahle isihlanganisi se-VHF njengonjiniyela?
Njengonjiniyela, kubalulekile ukwenza ukunakekelwa kwansuku zonke kwesihlanganisi se-VHF esiteshini sokusakaza ukuze kuqinisekiswe ukusebenza kahle. Lokhu kuhlanganisa ukuhlola njalo isihlanganisi ukuze kutholakale noma yiziphi izimpawu zomonakalo, ukuqinisekisa ukuthi konke ukuxhumana kuvikeleke ngendlela efanele, ukuhlola zonke izingxenye zesisekelo, nokuhlanza isihlanganisi ngesixazululo esigunyaziwe sokuhlanza. Ukwengeza, kubalulekile ukwenza izivivinyo ezivamile zokuzuza nokulahlekelwa ukuze uqiniseke ukuthi isihlanganisi sisebenza kahle futhi uhlole izinga lokushintshanisa. Okokugcina, kubalulekile ukuhlola amazinga amandla futhi wenze noma yiziphi izinguquko ezidingekayo.
Usilungisa kanjani isihlanganisi se-VHF uma singasebenzi?
Ukuze ulungise isihlanganisi se-VHF, uzodinga ukukhomba izingxenye eziphukile bese uzishintsha ufake izingxenye ezintsha ezihambisanayo. Okokuqala, qiniseka ukuthi ugesi uvaliwe bese usebenzisa i-multimeter ukuze uhlole i-voltage yengxenye ngayinye. Uma iphansi kune-voltage enconyiwe, kuzodingeka ishintshwe. Okulandelayo, sebenzisa i-soldering iron ukuze ususe noma yiziphi izingxenye eziphukile noma ezilimele. Bese, shintsha izingxenye eziphukile ufake ezintsha. Lapho izingxenye ezintsha sezisendaweni, zithengise ndawonye futhi usebenzise i-multimeter ukuze uhlole ukuthi i-voltage ilungile. Okokugcina, hlanganisa kabusha isihlanganisi futhi usihlole ukuze uqinisekise ukuthi sisebenza kahle. Uma ihluleka ukusebenza, kungase kudingeke ukuthi ushintshe izingxenye ezengeziwe.
Ukhetha kanjani ukupakishwa okufanele kwesihlanganisi se-VHF?
Lapho ukhetha ukupakishwa kwesihlanganisi se-VHF, qiniseka ukuthi ukhetha izinto eziqinile nezihlala isikhathi eside ngokwanele ukuvikela isihlanganisi kunoma yimuphi umonakalo wangaphandle. Ukwengeza, qiniseka ukupakisha isihlanganisi ngendlela evimbela noma yikuphi ukushaqeka noma ukudlidliza ngesikhathi sokuthutha. Kubalulekile futhi ukuqinisekisa ukuthi ukupakisha kuvalwe kahle ukuvimbela umswakama ukuthi ungangeni. Okokugcina, qiniseka ukuthi ulebula iphakheji ukuze uqinisekise ukuthi isihlanganisi asivezwa kunoma yimaphi amazinga okushisa adlulele ngesikhathi sokuthutha.
Iyiphi impahla esetshenziselwa ukufakwa kwe-casing yesihlanganisi se-VHF?
I-casing yesihlanganisi se-VHF ivamise ukwenziwa ngensimbi, njengensimbi noma i-aluminium. Lezi zinto ngeke zithinte ukusebenza kwesihlanganisi, inqobo nje uma isihlanganisi sivalwe kahle ukuvimbela noma yimuphi umswakama noma uthuli ukuthi lungangeni.
Siyini isakhiwo esiyisisekelo sesihlanganisi se-VHF?
Isakhiwo esiyisisekelo sesihlanganisi se-VHF ngokuvamile siqukethe i-duplexer, isolator, nesihlungi. I-duplexer ivumela amasignali amabili ukuthi ahlanganiswe noma ahlukaniswe futhi asebenze njengembobo yokufaka/yokukhiphayo yesihlanganisi. I-isolator ivimbela impendulo futhi ihlukanise isignali ngayinye kwenye, kuyilapho isihlungi sisiza ukwenqaba noma yiziphi izimpawu ezingadingeki. Ukusebenza nezimfanelo zesihlanganisi kunqunywa kakhulu izinga lezingxenye ezisetshenziswa ekwakhiweni kwayo. Ngaphandle kwanoma iyiphi yalezi zakhiwo, isihlanganisi ngeke sikwazi ukusebenza ngendlela evamile.
Ubani okufanele abelwe ukusebenzisa isihlanganisi se-VHF?
Umuntu owabelwe ukuphatha isihlanganisi se-VHF kufanele kube umuntu onolwazi nonolwazi ngokusakaza, amaza omsakazo, nama-transmitters. Lo muntu kufanele futhi abe namakhono amahle kakhulu okuxazulula izinkinga nolwazi lwezinhlelo ze-antenna, kanye nekhono lokuxazulula izinkinga nokuxilonga noma yiziphi izinkinga zobuchwepheshe ezingase ziphakame.
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