Yuav ua li cas siv coaxial cable

Coaxial cable yog ib qho xaim uas muaj ob qho kev ua siab zoo, thiab tus neeg xyuas pib thiab ntaub thaiv npog qhia zoo ib yam. Feem ntau cov coaxial cable muaj tooj liab hlau xaim tus cais tawm los ntawm cov khoom siv insulating. Nyob sab nraud ntawm cov khoom siv sab hauv insulating yog lwm txheej ntawm lub nplhaib neeg xyuas pib thiab nws cov rwb thaiv tsev, thiab tom qab ntawd tag nrho cov xov yog npog los ntawm ib qho hnab riam ntawm polyvinyl chloride los yog Teflon cov khoom. Cov. Nws yog tus yam ntxwv zoo los tiv thaiv kev cuam tshuam kev muaj peev xwm, cov ntaub ntawv xa mus ruaj khov thiab tus nqi qis, thiab tseem siv dav, xws li kaw xov hluav taws xob hauv TV. Cov coaxial thin cable kab feem ntau muag rau ob peb yuan ib meter, uas tsis kim heev. Coaxial cable yog siv los txuas nrog BNC lub taub hau. Cov coaxial cable muag khoom ntawm lub lag luam feem ntau yog cov khoom tiav tiav uas tau txuas nrog BNC lub taub hau. Koj tuaj yeem siv nws ncaj qha.

Txawm li cas los xij, raws li kev txheeb xyuas ntawm cov yam ntxwv ntawm cov coaxial cable nws tus kheej, qhov zoo ntawm lub teeb liab thaum nws mus ncig hauv cov coaxial cable muaj feem xyuam nrog kev sib kis thiab cov zaus ntawm cov teeb liab nws tus kheej. Feem ntau, lub teeb liab siab dua, ntau lub attenuation. Qhov bandwidth ntawm lub teeb liab video yog loj heev, nce mus txog 6MHz, thiab xim ntu ntawm cov duab yog raug hloov kho nyob rau qhov siab kawg ntawm qhov zaus, yog li thaum lub teeb liab video xa mus rau hauv cov coaxial cable, tsis tsuas yog tag nrho lub zog ntawm cov teeb liab yog attenuated, tab sis kuj tseem ceeb ntawm txhua qhov muaj feem cuam tshuam sib txawv ntau. Hauv particular, cov xim xim yog feem ntau attenuated. Yog li no, cov coaxial cable tsuas yog tsim nyog rau kev sib kis cov duab txuas ntawm qhov chaw deb. Thaum qhov kev sib kis tau mus txog li 200 metres, cov duab zoo yuav ua rau pom muaj kev cuam tshuam, tshwj xeeb tshaj yog cov xim ua kom tsaus ntuj thiab muaj qhov tsis paub txog ntawm distortion.

Hauv kev ua haujlwm hauv engineering, txhawm rau txuas ntxiv qhov kev sib kis tau, siv lub tshuab coaxial amplifier. Lub coaxial amplifier muaj qee qhov ua kom pom tseeb ntawm cov teeb liab video, thiab tuaj yeem them cov kev sib txawv ntawm cov sib txawv los ntawm kev hloov kho sib txawv los ntawm kev hloov kho sib npaug, yog li qhov cuam tshuam ntawm cov teeb liab video tso tawm los ntawm qhov kawg tau txais me me li sai tau. Txawm li cas los xij, coaxial amplifiers tsis tuaj yeem ua cascaded yam tsis muaj qhov txwv. Feem ntau, nyob rau lub kaw lus-taw qhia, qhov tso suab coaxial tsuas tuaj yeem ua tau mus txog 2 txog 3, txwv tsis pub cov kab tawm video tsis tuaj yeem lav thiab nws nyuaj kho. Yog li no, thaum siv cov xaim coaxial hauv ib qho kev soj ntsuam, txhawm rau kom paub tseeb cov duab zoo, qhov kis tau mus deb feem ntau tsuas yog kwv yees li plaub lossis tsib puas meters.