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Zophatikiza za VHF

A VHF chisaine (komanso odziwika as a VHF mpanda chisaine) is a chipangizo ntchito ku kuphatikiza angapo chizindikiro in ndi kwambiri mkulu pafupipafupi (VHF) zosiyanasiyana mu a single Chizindikiro. It is ofunika chifukwa kuwulutsa Magalimoto chifukwa it limalola angapo Tumizaninyengo ku gawo ndi yemweyo Antenna, amene bwino dongosolo Mwachangu ndi Kudalirika. izi is zofunikira in dongosolo ku wonjezani Chizindikiro mphamvu ndi patsogolo Kuphunzira m'dera.

Kodi chophatikiza cha VHF chimagwiritsidwa ntchito bwanji?
Zophatikiza za VHF zimagwiritsidwa ntchito kuphatikiza ma transmitters angapo ndi olandila kukhala kachitidwe kamodzi ka tinyanga. Izi zimapangitsa kuti ntchitoyo ikhale yogwira ntchito bwino komanso kuchepetsa ndalama. Zomwe zimagwiritsidwa ntchito kwambiri pazophatikizira za VHF zimaphatikizapo kuwulutsa, chitetezo cha anthu ndi mauthenga ankhondo, komanso wailesi yamasewera.
Kodi mumagwiritsa ntchito bwanji cholumikizira cha VHF pakuwulutsa?
1. Onetsetsani kuti tinyanga zonse za VHF zolumikizidwa ku chophatikizira zasinthidwa bwino komanso zili bwino.
2. Sinthani mosamala makonzedwe opindula a chophatikizira kuti agwirizane ndi kutulutsa kwa tinyanga.
3. Yang'anirani kutulutsa kophatikizana kuti muwonetsetse kuti zizindikirozo zikuphatikizidwa bwino ndipo kusokoneza kulikonse kumachotsedwa.
4. Pewani kugwiritsa ntchito chophatikizira m'madera omwe angathe kusokoneza kwambiri, monga pafupi ndi chingwe chamagetsi.
5. Onetsetsani kuti zigawo zina zowonjezera zimagwirizana bwino, monga amplifiers kapena zosefera.
6. Yang'anani nthawi zonse maulalo ndi zoikamo za chophatikiza kuti muwonetsetse kuti ntchito yabwino.
Kodi chophatikiza cha VHF chimagwira ntchito bwanji?
Chophatikizira cha VHF ndi chipangizo chomwe chimagwiritsidwa ntchito pamawayilesi owulutsa kuti aphatikize ma siginecha angapo kuchokera ku ma transmitter osiyanasiyana kuti atulutse kamodzi. Zimagwira ntchito pophatikiza ma sigino ochokera ku ma transmitter angapo kukhala chizindikiro chimodzi, chomwe chimawulutsidwa kuchokera ku mlongoti wamba. Izi zimathandiza kuchepetsa chiwerengero cha tinyanga zofunika pa wailesi. Zimathandizanso kuchepetsa kuchuluka kwa kusokoneza komwe kungachitike kuchokera ku ma siginali angapo akuwulutsidwa kuchokera ku tinyanga zingapo.
Kodi pali mitundu ingati ya ophatikiza a VHF ndipo pali kusiyana kotani pakati pawo?
Pali mitundu itatu ikuluikulu ya ophatikiza a VHF: osakhazikika, osakanizidwa, komanso ogwira ntchito. Zophatikizira za Passive VHF ndizosavuta komanso zotsika mtengo, koma zitha kugwiritsidwa ntchito ngati ma siginecha onse ali pamlingo wofanana wamagetsi. Zophatikiza za Hybrid VHF zimatha kunyamula ma siginecha pamlingo wosiyanasiyana wamagetsi, koma ndizovuta komanso zokwera mtengo kuposa zophatikizira zopanda pake. Zophatikizira za VHF zogwira ntchito zimapereka magwiridwe antchito apamwamba kwambiri, koma ndizovuta komanso zodula.
Kodi mumasankha bwanji chophatikiza chabwino kwambiri cha VHF?
Posankha chophatikizira chabwino kwambiri cha VHF pamawayilesi owulutsira, ndikofunikira kuganizira zingapo zofunika. Choyamba, lingalirani za kukula ndi masinthidwe a chophatikizira cha VHF, kuti muwonetsetse kuti ikukwanira malo omwe alipo ndipo idzasamalira mphamvu za wayilesiyo komanso kuchuluka kwa ma frequency. Kachiwiri, lingalirani zamtundu wa zida ndi zida zomwe zimagwiritsidwa ntchito pazogulitsa, kuwonetsetsa kuti zikugwirizana ndi zomwe wailesiyi ikufuna. Pomaliza, ganizirani mtengo wa chinthucho, komanso zitsimikizo zilizonse kapena zitsimikizo zoperekedwa. Ndikofunikiranso kuwerenga ndemanga zamakasitomala kuti mumve bwino za momwe mankhwalawo angagwiritsire ntchito bwino.
Kodi mumalumikiza bwanji cholumikizira cha VHF munjira yowulutsira?
1. Yambani mwa kulumikiza mlongoti ndi kulowetsa kwa chophatikizira cha VHF.
2. Lumikizani kutulutsa kwa chophatikiza ndi chotumizira.
3. Lumikizani nthaka ya chophatikizira pansi pa chotumizira.
4. Onetsetsani kuti maulumikizidwe onse ali otetezeka ndipo chophatikiza chikuyendetsedwa.
5. Tsimikizirani kulumikizidwa ndi mita ya VSWR kapena zida zina zoyezera.
6. Sinthani kulowetsa ndi kutulutsa matalikidwe a chophatikizira ku milingo yomwe mukufuna.
7. Yang'anirani ntchito ya chophatikizira ndi chotumizira kuti muwonetsetse kugwira ntchito moyenera.
Ndi zida ziti zomwe zimagwirizana ndi cholumikizira cha VHF?
Zida zokhudzana ndi chophatikizira cha VHF pawailesi yowulutsira zikuphatikiza: zokulitsa zolumikizira, zophatikiza zosefera, mizere yotumizira, ma antenna couplers, ma coupler owongolera, ndi zogawa mphamvu.
Kodi zofunika kwambiri zakuthupi ndi RF za chophatikiza cha VHF ndi ziti?
Zofunikira kwambiri zakuthupi ndi za RF zophatikizira VHF zikuphatikiza:
- Frequency Range: Chophatikizira cha VHF chikuyenera kugwira ntchito kudutsa ma frequency a VHF (30 MHz - 300 MHz).
- Kutayika Kuyika: Kutayika koyika kuyenera kukhala kochepa, nthawi zambiri kuchepera 0.5 dB.
- Kutaya Kubwerera: Kutayika kobwerera kuyenera kukhala kwakukulu, komwe kumakhala kokulirapo kuposa 10 dB.
- Kudzipatula: Kudzipatula pakati pa madoko kuyenera kukhala kokwera, nthawi zambiri kuposa 30 dB.
- VSWR: VSWR iyenera kukhala yotsika, nthawi zambiri zosakwana 1.5: 1.
- Kusokoneza: Kulepheretsa kuyenera kukhala 50 Ohms.
- Kugwiritsa Ntchito Mphamvu: Kugwiritsa ntchito mphamvu kuyenera kukhala kokwanira kugwiritsa ntchito.
Kodi mumasunga bwanji cholumikizira cha VHF ngati injiniya?
Monga mainjiniya, ndikofunikira kukonza cholumikizira cha VHF tsiku lililonse pawailesi yowulutsira kuti zitsimikizire kuti zikuyenda bwino. Izi zikuphatikizapo kuyang'anitsitsa chophatikizira nthawi zonse kuti muwone zizindikiro zowonongeka, kuonetsetsa kuti maulumikizi onse ali otetezedwa bwino, kuyang'ana zigawo zonse zapansi, ndikuyeretsa chophatikizira ndi njira yoyeretsera yovomerezeka. Kuphatikiza apo, ndikofunikira kuyeserera kupindula ndi kutayika pafupipafupi kuti muwonetsetse kuti chophatikizira chikugwira ntchito moyenera ndikuwunika mulingo wa intermodulation. Pomaliza, ndikofunikira kuyang'ana milingo yamagetsi ndikupanga kusintha kulikonse kofunikira.
Kodi mumakonza bwanji cholumikizira cha VHF ngati sichikugwira ntchito?
Kuti mukonze chophatikizira cha VHF, muyenera kuzindikira magawo osweka ndikusintha ndi magawo atsopano ogwirizana. Choyamba, onetsetsani kuti mphamvuyo yazimitsidwa ndiyeno gwiritsani ntchito multimeter kuti muwone mphamvu ya chigawo chilichonse. Ngati ili yotsika kuposa mphamvu yovomerezeka, ndiye kuti iyenera kusinthidwa. Kenako, gwiritsani ntchito chitsulo chosungunulira kuti muchotse mbali zonse zosweka kapena zowonongeka. Kenako, sinthani mbali zosweka ndi zatsopano. Zigawo zatsopano zikakhazikika, zigulitsani pamodzi ndikugwiritsa ntchito multimeter kuti muwone ngati magetsi ndi olondola. Pomaliza, phatikizaninso cholumikizira ndikuchiyesa kuti muwonetsetse kuti chikugwira ntchito bwino. Ngati sichikugwira ntchito, mungafunike kusintha magawo ena.
Kodi mumasankha bwanji choyikapo choyenera cha chophatikiza cha VHF?
Posankha zoyikapo zophatikizira VHF, onetsetsani kuti mwasankha zida zolimba komanso zolimba kuti ziteteze chophatikizira ku kuwonongeka kulikonse kwakunja. Kuphatikiza apo, onetsetsani kuti mwanyamula cholumikizira m'njira yomwe ingapewere kugwedezeka kapena kugwedezeka kulikonse panthawi yamayendedwe. Ndikofunikiranso kuonetsetsa kuti zotengerazo zatsekedwa bwino kuti chinyezi chisalowe. Pomaliza, onetsetsani kuti mwalembapo paketiyo kuti muwonetsetse kuti cholumikizira sichikutentha kwambiri pakadutsa.
Ndizinthu ziti zomwe zimagwiritsidwa ntchito popanga cholumikizira cha VHF?
Chophimba cha chophatikizira cha VHF nthawi zambiri chimapangidwa ndi chitsulo, monga chitsulo kapena aluminiyamu. Zidazi sizidzasokoneza ntchito ya chophatikizira, malinga ngati chophatikiziracho chikusindikizidwa bwino kuti chiteteze chinyezi kapena fumbi kulowa.
Kodi chophatikizira cha VHF ndi chiyani?
Mapangidwe a VHF ophatikiza nthawi zambiri amakhala ndi duplexer, isolator, ndi fyuluta. Duplexer imalola kuti zizindikilo ziwiri ziphatikizidwe kapena kugawanika ndipo zimakhala ngati doko lolowera / lotulutsa la chophatikiza. Wodzipatula amalepheretsa mayankho ndikudzipatula chizindikiro chilichonse kwa chimzake, pomwe fyuluta imathandizira kukana zizindikiro zilizonse zosafunikira. Ntchito ndi zikhumbo za ogwirizanitsa zimatsimikiziridwa makamaka ndi ubwino wa zigawo zomwe zimagwiritsidwa ntchito pomanga. Popanda chilichonse mwazinthu izi, cholumikizira sichingagwire ntchito bwino.
Ndani ayenera kupatsidwa ntchito yolumikizira VHF?
Munthu amene wapatsidwa ntchito yoyang'anira chophatikizira cha VHF akuyenera kukhala munthu wodziwa zambiri komanso wodziwa bwino za kuwulutsa, ma frequency a wailesi, ndi ma transmitters. Munthuyu ayeneranso kukhala ndi luso lapamwamba lothana ndi mavuto komanso chidziwitso cha makina a tinyanga, komanso kuthekera kothana ndi zovuta zilizonse zomwe zingachitike.
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