Coaxial cable los ntawm sab hauv tawm yog muab faib ua plaub hau: lub hauv paus tooj hlau (ib qho hluav taws xob ntawm cov khoom los yog txoj hlua tawm), yas insulator, mesh conductive txheej thiab xaim hlau. Lub hauv paus tooj hlau xaim hlau thiab cov kab hluav taws xob ua cov txheej txheem ib daim voj voos tam sim no. Vim hais tias central tooj liab hlau thiab mesh conductive txheej rau coaxial kev sib raug zoo npe.
Coaxial cable conduction AC ntau tshaj li qhov ncaj qha tam sim no, uas yog, txhua thib ob yuav muaj ob peb zaug qhov kev taw qhia ntawm qhov tam sim no reversal.
Yog hais tias muaj kev kub ntxhov tam sim no siv lub xov tooj cua, cov xov hlau yuav sib haum mus rau lub kav hlau txais xov tawm uas tawm suab sab nraud tawm, uas dissipates zog ntawm lub teeb liab thiab txo cov teeb liab uas tau txais.
Coaxial cable yog tsim los daws qhov teeb meem no. Lub xov tooj cua los ntawm lub xov tooj hlau yog cais los ntawm cov mesh zoo li cov txheej txheem, thiab cov txheej txheem mesh-tus txheej txheem muaj peev xwm tswj tau cov xov tooj cua uas tau tso tawm los ntawm av.
Coaxial cable kuj muaj ib qho teeb meem, yog li, yog tias ib lub xov tooj cable loj dua los yog sib tw ua kom sib deev, ces lub xov tooj cua thiab lub ntsej muag ntawm cov txheej txheem tsis yog ib txwm sib txawv, uas yuav ua rau lub xov tooj cua tsis muaj Reflected rov qab rau qhov teeb liab qhov chaw. Cov nyhuv no muaj peev xwm txo tau cov teeb liab uas muaj peev xwm. Yuav kom kov tau qhov teeb meem no, lub xov tooj xaim thiab lub ntsej muag zoo li txheej txheej yog sib koom ua ke ntawm ib txheej yas insulator kom paub meej tias qhov kev ncua deb ntawm lawv yog tib yam. Qhov no kuj ua rau lub pob zeb txhuam thiab tsis yooj yim rau khoov.
SYV cable tag nrho lub npe polyethylene insulated RF coaxial cable, coaxial cable hauv ib.
SYV-75-5: SYV yog tus yees duab cable, 75 nruab nrab ntawm impedance 75 ohms, thiab 5 nruab nrab yog xaim tuab.
SYV 75-5-1 (A, B, C)
S: RF Y: Polyethylene rwb thaiv tsev V: Polyvinyl chloride sheath A: 64 B: 96 C: 128
75:75 ohm 5: hlau diam 5MM 1: sawv cev ntawm ib tus ntxhais
SYV cable tes hauj lwm: saib xyuas cov kab yees siv feem ntau yog cov SYV 75-3 thiab SYV75-5. Yog tias koj xav muab cov duab teeb tseg hauv 200 meters rau siv tau SYV 75-3, yog tias qhov ntau ntawm 350 meters siv tau SYV75-5.
SYV cable siv thaj chaw: khoom siv rau kev sib txuas, CCTV (CCTV), sib koom kav hlau txais xov (MATV) thiab xim xim los yog cov xov tooj cua monochrome saib xyuas. Cov kev siv no tsis tas yuav tsum tau xaiv qhov kev yees duab zoo nkauj ua ke nrog kev siv hluav taws xob ua kom muaj zog. Video coaxial cable cwj pwm tsis haum yog 75 ohms, qhov no tus nqi tsis yog xaiv. Lub physics proves tias cov yam ntxwv ntawm attenuation ntawm lub teeb liab video yog optimised ntawm 77 ohms. Hauv cov ntawv qis zog, cov khoom siv thiab tus qauv txiav txim siab qhov kev pom zoo ntawm qhov cable yog 75 ohms.
