Nyob rau hauv tsab xov xwm no peb yuav saib ntawm high-frequency xov tooj cua teeb liab amplifiers rau cable TV ntawm coaxial ib feem ntawm kab.
Cov ntsiab lus ntawm cov kab lus
- Ntu 6: RF Signal Amplifiers
- Ntu 7: Optical receivers
- Part 8: Optical backbone network
- Ntu 9: Headend
- Ntu 10: Kev daws teeb meem ntawm CATV network
Yog hais tias tsuas muaj ib tug optical receiver nyob rau hauv ib lub tsev (los yog txawm nyob rau hauv ib tug tag nrho thaiv) thiab tag nrho cov xaim rau cov risers yog tsim nrog coaxial cable, lub teeb liab amplification yuav tsum tau thaum pib. Hauv peb lub network, peb tsuas yog siv cov khoom siv los ntawm Teleste, yog li kuv yuav qhia koj siv lawv cov piv txwv, tab sis hauv paus, cov khoom siv los ntawm lwm cov tuam txhab tsis txawv thiab cov txheej txheem ntawm kev teeb tsa feem ntau zoo sib xws.
Tus qauv CXE180M muaj qhov tsawg kawg nkaus ntawm kev teeb tsa:
Raws li tej zaum koj yuav nco ntsoov los ntawm cov khoom dhau los, lub teeb liab muaj ob qhov tseem ceeb ntawm qhov ntsuas: qib thiab txoj kab nqes. Lawv yog cov uas tuaj yeem pab kho qhov teeb tsa amplifier. Cia peb pib nyob rau hauv kev txiav txim: tam sim ntawd tom qab lub input connector muaj attenuator. Nws tso cai rau koj kom txo tau cov teeb liab tawm tswv yim txog li 31 dB (thaum lub xiav jumper hloov raws li daim duab, lub pob qhov rooj hloov ntawm 0-15 txog 16-31 dB). Qhov no yuav tsim nyog yog tias lub amplifier tau txais lub teeb liab ntau dua 70 dBΒ΅V. Qhov tseeb yog hais tias lub amplifier theem muab ib tug nce nyob rau hauv lub teeb liab theem los ntawm 40 dB, thiab nyob rau hauv cov zis peb yuav tsum tau tshem tawm tsis pub tshaj 110 dBΒ΅V (nyob rau theem siab dua lub teeb liab-rau-suab nrov ratio poob sharply thiab daim duab no muaj feem xyuam rau. tag nrho cov broadband amplifiers thiab receivers nrog ib tug built-in amplifier). Yog li, yog tias 80 dBΒ΅V ncav cuag lub tswv yim ntawm lub amplifier, piv txwv li, tom qab tso zis nws yuav muab 120 dBΒ΅V rau peb ntawm cov suab nrov thiab cov lej tawg. Txhawm rau zam qhov no, koj yuav tsum teeb tsa lub input attenuator rau 10 dB damping txoj hauj lwm.
Qab lub attenuator peb pom sib npaug. Nws yog ib qho tsim nyog yuav tsum tshem tawm qhov rov qab qaij, yog tias muaj. Qhov no yog ua tiav los ntawm kev txo cov teeb liab theem nyob rau hauv qhov tsawg zaus cheeb tsam mus txog 20 dB. Nws yog ib nqi sau cia hais tias peb yuav tsis muaj peev xwm tshem tawm qhov rov qab txoj kab nqes los ntawm kev nce qib ntawm lub sab sauv frequencies, tsuas yog suppress tus qis dua.
Ob lub cuab yeej no feem ntau txaus los kho me ntsis teeb liab sib txawv ntawm cov qauv. Yog tias qhov no tsis yog qhov teeb meem, koj tuaj yeem siv cov hauv qab no:
Cable simulator, ua nyob rau hauv daim ntawv ntawm ib tug insert uas yuav muab tso rau horizontally los yog vertically, raws li lub npe implies, simulates lub inclusion ntawm ib tug ntev seem ntawm cable, nyob rau hauv uas attenuation ntawm feem ntau lub sab sauv frequencies ntawm qhov ntau yuav tsum tshwm sim. Qhov no tso cai rau koj kom txo tau txoj kab nqes ncaj nraim yog tias tsim nyog, suppressing 8 dB nyob rau hauv qhov chaw siab. Qhov no tuaj yeem muaj txiaj ntsig zoo thaum txhim kho amplifiers hauv cascade hla qhov deb, piv txwv li.
Tom qab cov manipulations, lub teeb liab dhau los ntawm thawj theem ntawm lub amplifier theem, tom qab ntawd peb pom lwm qhov ntxig, uas tso cai rau peb kom txo tau qhov nce ntxiv. Lub jumper tom qab nws yuav rov pab peb txo qis frequencies kom tau txais txoj kab nqes uas xav tau. Ob qhov kev teeb tsa no yog qhov tseem ceeb tib yam li input attenuator thiab equalizer, tab sis ua haujlwm nrog theem thib ob ntawm cascade.
Ntawm cov zis ntawm lub amplifier theem peb pom tes tap. Qhov no yog tus qauv threaded connector uas koj tuaj yeem txuas lub ntsuas ntsuas lossis TV receiver los saib xyuas qhov zoo ntawm cov teeb liab tso zis. Tsis yog txhua yam khoom siv thiab yuav luag tsis muaj TVs muaj peev xwm ua tau zoo lub teeb liab nrog rau theem ntawm ib puas lossis ntau dua dBΒ΅V, yog li kev sim ua rau txhua yam khoom siv ib txwm ua nrog kev txo qis ntawm 20-30 dB los ntawm cov nqi tso tawm tiag tiag. Qhov no yuav tsum nco ntsoov nco ntsoov thaum ntsuas ntsuas.
Lwm qhov ntxig yog ntsia ua ntej qhov tawm. Daim duab ntawm lub amplifier qhia tau hais tias lub xub qhia ntawm nws taw qhia tsuas yog rau sab xis davhlau ya nyob twg. Thiab qhov no txhais tau tias yuav tsis muaj teeb liab ntawm sab laug. Xws li cov ntxig tau suav nrog hauv cov amplifiers "tawm ntawm lub thawv", thiab hauv lub thawv nws tus kheej muaj lwm qhov suav nrog hauv cov khoom xa tuaj:
Nws tso cai rau koj siv qhov tso zis thib ob, tab sis inevitably qhia lub teeb liab attenuation ntawm 4 dB.
Thaum xub thawj siab ib muag, lub amplifier qauv CXE180RF muaj ob zaug ntau qhov chaw:
Qhov tseeb, txhua yam tsis txaus ntshai: nrog rau qhov sib txawv me me, txhua yam ntawm no yog tib yam li hauv ib qho uas tau tham saum toj no.
Ua ntej, qhov ntsuas kais tau tshwm sim ntawm qhov kev nkag. Nws yog ib qho tsim nyog los tswj lub teeb liab yam tsis muaj kev cuam tshuam cov kab hluav taws xob los ntawm cov khoom siv amplifier thiab, raws li, tsis muaj kev cuam tshuam kev tshaj tawm.
Thib ob, cov lim dej tshiab diplex, nrog rau cov zis attenuator thiab sib npaug, yog qhov tsim nyog rau kev teeb tsa DOCSIS kis tau tus mob, yog li rau lub hom phiaj ntawm tsab xov xwm no kuv tsuas yog hais tias cov ntxaij lim dej txiav tawm cov zaus uas tau qhia rau lawv thiab qhov no tuaj yeem ua tau. ua ib qho teeb meem yog hais tias nyob rau hauv lub teeb liab spectrum TV channel tau tshaj tawm nyob rau hauv cov frequencies. Hmoov zoo, cov chaw tsim khoom tsim lawv nrog cov txiaj ntsig sib txawv thiab hloov lawv yog tias tsim nyog tsis yog qhov nyuaj.
Cov pob qhov rooj (nrog rau lub jumper, uas qhia txog qhov attenuation ntawm 10 dB) cuam tshuam rau cov channel rov qab thiab tsis muaj peev xwm hloov lub teeb liab TV.
Tab sis peb tus jumpers ntxiv muab rau peb kom paub txog cov cuab yeej xws li fais fab chaw taws teeb.
Thaum tsim tsev, amplifiers feem ntau muab tso rau hauv qhov chaw uas tej zaum yuav muaj teeb meem nrog cov khoom siv hluav taws xob los ntawm cov khoom siv hluav taws xob. Tsis tas li ntawd, txhua tus plug-socket khub, uas kuj muaj xws li ib tug Circuit Court breaker (uas tuaj yeem ntsia tau rau hauv qhov chaw uas tsis tau xav txog tshaj plaws), sawv cev rau qhov muaj peev xwm ua tsis tiav. Hauv qhov no, nws tuaj yeem siv hluav taws xob ncaj qha los ntawm coaxial cable. Ntxiv mus, raws li tau pom los ntawm cov cim ntawm lub hwj huam mov phaj, nws tuaj yeem hloov pauv lossis ncaj qha tam sim no nrog qhov dav dav dav. Yog li: peb lub jumpers no pab kom muaj peev xwm ntawm cov khoom siv tam sim no ntws mus rau cov tswv yim, nrog rau txhua qhov ntawm ob qhov kev tso tawm sib cais, yog tias peb xav tau lub zog txuas ntxiv rau hauv lub cascade. Thaum lub riser nrog cov neeg siv khoom qhib, qhov hluav taws xob tsis tuaj yeem muab rau cov zis, tau kawg!
kuv twb hais rau hauv ib feem uas nyob rau hauv xws li ib tug tshwj xeeb lub ntsiab kais dej yog siv:
Lawv siv cov ntsiab lus loj thiab txhim khu kev qha, thiab lub cev loj muab cov cua sov thiab kev tiv thaiv.
Lub hwj chim qhov chaw nyob rau hauv cov ntaub ntawv no yog ib tug thaiv nrog ib tug built-in loj transformer:
Nws yog ib qho tsim nyog hais tias, txawm hais tias qhov zoo tshaj plaws ntawm cov phiaj xwm hluav taws xob tej thaj chaw deb, cov amplifiers ua haujlwm hauv txoj kev no tsis tshua muaj peev xwm muaj sia nyob hauv tsev tsis muaj qhov tshwm sim, thiab thaum hloov lawv, cov neeg ua haujlwm kev ua haujlwm tseem yuav tsum nrhiav thiab tua. lub hwj chim rau chav tsev nws tus kheej, thiaj li tsis mus ua hauj lwm nrog nyob cables thiab, yog li, thaum ib tug amplifier hloov, tag nrho lub tsev tseem tsis muaj teeb liab. Rau tib lub laj thawj, xws li amplifiers yuav tsum tau kuaj kais ntawm cov tswv yim: txwv tsis pub koj yuav tsum tau ua haujlwm nrog lub cable nyob.
Nws yuav nthuav kom paub los ntawm cov npoj yaig yuav ua li cas cov kab ke sib txuas nrog cov chaw taws teeb fais fab, sau rau hauv cov lus yog tias koj siv lawv, thov.
Yog tias koj xav tau txuas ntau lub TV hauv chav tsev lossis chaw ua haujlwm, koj tuaj yeem ntsib qhov tsis muaj qib tom qab cov saw hlau sib faib. Nyob rau hauv rooj plaub no, nws yog ib qho tsim nyog yuav tsum tau nruab lub amplifier ntawm cov neeg siv khoom hauv tsev, rau cov khoom siv me me uas muaj qhov tsawg kawg nkaus ntawm kev teeb tsa thiab qib qis dua siv.
Piv txwv li, zoo li no:
Tau qhov twg los: www.hab.com