Uma uke wasebenzisa ukuxhumana kwe-RF (ifrikhwensi yomsakazo), amanethiwekhi weselula, noma amasistimu e-antenna, ungase uhlangane negama elithi ikhebula le-LMR. Kodwa liyini ngempela futhi kungani lisetshenziswa kabanzi kangaka? Kulesi sihloko, sizohlola ukuthi iyini ikhebula le-LMR, izici zayo ezibalulekile, nokuthi kungani kuyisinqumo esikhethwayo sezinhlelo ze-RF, bese siphendula umbuzo othi 'Iyini ikhebula le-LMR?'.
Qonda intambo ye-coaxial ye-LMR
Ikhebula le-LMR yikhebula eliqinile eliklanyelwe ukusebenza okuphezulu, ukudluliswa kwesignali yokulahlekelwa okuphansi ezinhlelweni ze-RF. Izintambo ze-LMR zikhiqizwa yi-Times Microwave Systems futhi zidume ngokuvikela kwazo okuhle kakhulu, ukulahlekelwa kwesignali ephansi, nokuqina, okuzenza zilungele ukuxhumana okungenantambo nge-GPS, Inketho ekahle yerada nezinye izinhlelo ezisekelwe ku-RF. Ngokungafani nezintambo zendabuko ze-coaxial, izintambo ze-LMR zenzelwe izendlalelo eziningi zokuvikela kanye nezinto ze-dielectric ukuze kuqinisekiswe ubuqotho besignali engcono. Ziza ngosayizi abahlukahlukene ongakhetha kuzo, njenge-LMR-195, LMR-240, LMR-400, ne-LMR-600, ngayinye yakhelwe ukucubungula amandla ahlukene kanye nezidingo zokulahleka kwesignali.
Izici eziyinhloko ze-LMR coaxial cable
Izintambo ze-LMR zigqama emkhakheni wezintambo ezingama-coaxial ngenxa yesakhiwo sazo esiyingqayizivele kanye nezinzuzo zokusebenza:
1. Ukulahlekelwa kwesignali ephansi
Enye yezinzuzo ezibaluleke kakhulu zezintambo ze-LMR ezinokulahlekelwa kwesignali ephansi ukuncipha kwazo kumabanga amade (ukulahlekelwa kwesignali). Lokhu kufezwa ngokufakwa kwe-dielectric kwekhwalithi ephezulu nokuvikela, okunciphisa ukulahlekelwa kwamandla lapho amasignali edlula ezintambo.
2. Ukusebenza okuhle kakhulu kokuvikela
Idizayini yekhebula ye-LMR inezendlalelo eziningi ezivikelayo, ngokuvamile ezihlanganisa isivikelo se-aluminium strip yokuvikela okuyinhloko kwe-EMI (i-electromagnetic interference). Ukwaluka isivikelo sangaphandle kuthuthukisa ukuqina futhi kunciphisa kakhulu ukuphazamiseka. Lesi sivikelo siqinisekisa amasiginali anamandla futhi acace kakhudlwana, okwenza izintambo ze-LMR zibe ukukhetha okufanele ezinhlelweni ze-RF ezibucayi.
3. Ukuqina kanye nokumelana nesimo sezulu
I-Times Microwave Systems ikhiqiza izintambo ze-LMR, umgodla wayo wangaphandle oqinile wenziwe nge-polyethylene (PE) noma i-thermoplastic elastomer (TPE), okwenza ukuthi imelane nemisebe ye-ultraviolet, umswakama, namazinga okushisa aphezulu. Okunye okuhlukile, okufana ne-LMR-UF (Ultra Flex), kunikeza ukuguquguquka okwengeziwe kokufakwa okudinga ukugoba nokunyakaza okuvamile.
4. Ukufakwa okuguquguqukayo nokulula
Uma kuqhathaniswa nezintambo ze-coaxial eziqinile zendabuko, izintambo ze-LMR zinokuguquguquka okuphezulu futhi zingasindi, okwenza ukufakwa kube lula. I-radius yabo yokugoba incane kakhulu kunaleyo yezintambo ze-RF ezifanayo, ezivumela ukufakwa okuqinile ezindaweni ezivalekile.
5. Ukuhambisana nezixhumi ze-RF
Izintambo ze-LMR zisekela izixhumi eziningi, okuhlanganisa nezixhumi zohlobo lwe-N (ezivamise ukusetshenziswa ku-antenna nasezinhlelweni ze-RF). Isixhumi se-SMA (samasistimu angenawaya kanye ne-GPS). Isixhumi se-BNC (esidumile kwezokusakaza kanye nenethiwekhi). Lokhu kuhambisana kubenza babe nezinto ezihlukahlukene kakhulu ezimbonini ezihlukahlukene.
Izicelo Ezivamile Zezintambo ze-LMR
Ngenxa yokusebenza kwayo okuhle kakhulu, izintambo ze-LMR zisetshenziswa kakhulu ezimbonini ezithembele ekuxhumaneni kwe-RF. Ezinye zezinhlelo zokusebenza ezivame kakhulu zihlanganisa amanethiwekhi angenawaya namaselula, i-antenna nezinhlelo ze-RF, i-GPS nezokuxhumana ngesathelayithi, izinhlelo zokusebenza ze-aerospace, ukuqapha kanye nezinhlelo zokuphepha.
Khetha ikhebuli ye-LMR efanele
Ukukhethwa kohlobo olulungile lwekhebula le-LMR kuncike ezintweni ezimbalwa, okuhlanganisa imvamisa, ibanga, ukuphatha amandla, nezimo zemvelo. Nazi ezinye izinketho ezijwayelekile:
I-LMR-195 kanye ne-LMR-240: Ifanele izinhlelo zokusebenza zebanga elifushane ezifana nezinti ze-Wi Fi nezinhlelo ze-GPS.
I-LMR-400: Inketho ephansi yokulahlekelwa emaphakathi evame ukusetshenziswa kumaselula kanye nezinhlelo zomsakazo wezindlela ezimbili.
I-LMR-600: Ilungele kakhulu izinhlelo zokusebenza ezikude lapho ukulahlekelwa kwesignali kufanele kwehliswe kakhulu.
Uma udinga ukuguquguquka kwezinhlelo zokusebenza zeselula, intambo ye-LMR-UF (Ultra Flex) nayo iyisinqumo esihle.
Isikhathi sokuthumela: Mar-13-2025