Ngati mudagwiritsapo ntchito RF (radio frequency) kulumikizana, ma cellular network, kapena antenna system, mutha kukumana ndi mawu akuti LMR chingwe. Koma kodi kwenikweni ndi chiyani ndipo n’chifukwa chiyani amagwiritsidwa ntchito kwambiri? M'nkhaniyi, tiwona kuti chingwe cha LMR ndi chiyani, mawonekedwe ake ofunikira, komanso chifukwa chake ndi chisankho chomwe chimasankhidwa pamapulogalamu a RF, ndikuyankha funso 'Kodi chingwe cha LMR ndi chiyani?'.
Kumvetsetsa chingwe cha LMR coaxial
Chingwe cha LMR ndi chingwe cha coaxial chomwe chimapangidwira kuti chizigwira ntchito kwambiri, chochepa chotaya chizindikiro pamapulogalamu a RF. Zingwe za LMR zimapangidwa ndi Times Microwave Systems ndipo zimadziwika chifukwa chotchinjiriza bwino, kutayika kwa ma siginecha pang'ono, komanso kulimba, zomwe zimawapangitsa kukhala abwino kwa GPS yolumikizirana opanda zingwe, Chisankho chabwino cha radar ndi makina ena a RF. Mosiyana ndi zingwe zama coaxial zachikhalidwe, zingwe za LMR zimapangidwa ndi zigawo zingapo zotchingira ndi zida za dielectric kuti zitsimikizire kukhulupirika kwa siginecha. Zimabwera mosiyanasiyana kuti musankhepo, monga LMR-195, LMR-240, LMR-400, ndi LMR-600, iliyonse yopangidwa kuti igwiritsidwe ntchito mosiyanasiyana komanso kutayika kwazizindikiro.
Makhalidwe akuluakulu a LMR coaxial cable
Zingwe za LMR zimadziwika bwino pagawo la zingwe za coaxial chifukwa cha mawonekedwe awo apadera komanso ubwino wake:
1. Kutayika kwa chizindikiro chochepa
Ubwino umodzi wofunikira wa zingwe za LMR zokhala ndi kutayika kwazizindikiro zotsika ndikutsika kwawo pamtunda wautali (kutayika kwa ma sign). Izi zimatheka kudzera muzitsulo zapamwamba za dielectric ndi chitetezo, zomwe zimachepetsa kutaya mphamvu pamene zizindikiro zimadutsa pazingwe.
2. Kuchita bwino kwachitetezo
Mapangidwe a chingwe cha LMR ali ndi zigawo zingapo zotchinjiriza, makamaka kuphatikiza zotchinga za aluminiyamu zotchingira zoyambira za EMI (electromagnetic interference) chitetezo. Kuluka chishango chakunja kumalimbitsa kulimba komanso kumachepetsa kusokoneza. Kutchinjiriza kumeneku kumatsimikizira ma siginecha amphamvu komanso omveka bwino, kupangitsa zingwe za LMR kukhala chisankho choyenera pamapulogalamu amtundu wa RF.
3. Kukhalitsa ndi kukana nyengo
Times Microwave Systems imapanga zingwe za LMR, zomwe sheath yake yakunja yolimba imapangidwa ndi polyethylene (PE) kapena thermoplastic elastomer (TPE), zomwe zimapangitsa kuti zisagwirizane ndi cheza cha ultraviolet, chinyezi, komanso kutentha kwambiri. Zosintha zina, monga LMR-UF (Ultra Flex), zimapereka kusinthasintha kowonjezera pakuyika komwe kumafuna kupindika pafupipafupi komanso kuyenda.
4. Kusinthika komanso kosavuta kukhazikitsa
Poyerekeza ndi zingwe zachikhalidwe zolimba za coaxial, zingwe za LMR zimakhala ndi kusinthasintha kwakukulu komanso zopepuka, zomwe zimapangitsa kukhazikitsa kosavuta. Ma radius awo opindika ndi ochepa kwambiri kuposa a zingwe zofananira za RF, zomwe zimalola kuyika molimba m'mipata yotsekedwa.
5. Kugwirizana ndi zolumikizira za RF
Zingwe za LMR zimathandizira zolumikizira zingapo, kuphatikiza zolumikizira zamtundu wa N (zomwe zimagwiritsidwa ntchito mu antenna ndi mapulogalamu a RF). Chojambulira cha SMA (cha machitidwe opanda zingwe ndi GPS). BNC cholumikizira (chotchuka pakuwulutsa ndi maukonde). Kugwirizana kumeneku kumawapangitsa kukhala osinthasintha kwambiri m'mafakitale osiyanasiyana.
Kugwiritsa Ntchito Wamba kwa LMR Cables
Chifukwa chakuchita bwino kwambiri, zingwe za LMR zimagwiritsidwa ntchito kwambiri m'mafakitale omwe amadalira kulumikizana kwa RF. Zina mwazinthu zomwe zimagwiritsidwa ntchito nthawi zambiri zimaphatikizapo ma waya opanda zingwe ndi ma cellular, antenna ndi machitidwe a RF, GPS ndi mauthenga a satana, kugwiritsa ntchito ndege, kuyang'anira ndi chitetezo.
Sankhani chingwe cholondola cha LMR
Kusankhidwa kwa mtundu wolondola wa chingwe cha LMR kumatengera zinthu zingapo, kuphatikiza ma frequency, mtunda, kagwiridwe ka mphamvu, ndi chilengedwe. Nazi zina zomwe mungasankhe:
LMR-195 ndi LMR-240: Yoyenera kugwiritsa ntchito njira zazifupi monga tinyanga za Wi Fi ndi machitidwe a GPS.
LMR-400: Njira yotsika yotayika yapakatikati yomwe imagwiritsidwa ntchito pamawayilesi am'manja ndi njira ziwiri.
LMR-600: Yoyenera kwambiri pamagwiritsidwe akutali komwe kutayika kwa ma siginecha kuyenera kuchepetsedwa kwambiri.
Ngati mukufuna kusinthasintha kwamapulogalamu am'manja, chingwe cha LMR-UF (Ultra Flex) ndichosankhanso chabwino.
Nthawi yotumiza: Mar-13-2025