Dab tsi yog txoj hauv kev ntawm cable TV amplifier nrhiav thiab debugging?
Thaum tsim thiab debugging tsoos cable TV neeg siv amplifiers, txwv los ntawm kev faib tus nqi ntawm cov neeg siv amplifier distortion ntsuas, lawv tsuas siv tau ib tug kuj loj ntau yam ntawm cov zis theem qhov tseem ceeb thiab input theem qhov tseem ceeb. Txoj kev tsim thiab kev debugging no tsis yog qhov tsim nyog rau kev txhim kho lub amplifier qhov kev ua tau zoo. Cov neeg siv faib ua haujlwm tau zoo, nws tsis yooj yim los lav nws cov cab kuj-rau-suab nrov piv ntsuas. Tom ntej no, Kuv yuav qhia koj li cas los ntes thiab debug lub Cable TV nrov dua, Kuv vam tias nws yuav pab tau koj!
1. Ua ntej xyuas seb lub hwj huam mov ntawm lub cev amplifier puas zoo li qub. Yog tias tsis muaj teeb meem, qhib lub hwj huam mov (60V) los muab lub hwj chim rau lub amplifier.
(1) Txuas lub zog ntsuas lub zog mus rau qhov chaw nkag qib ntsuas qhov chaw nres nkoj ntawm lub cev amplifier los ntsuas cov theem nkag (cov duab cab kuj zaus) ntawm txhua qhov channel. Yog hais tias lub input theem ntawm lub cev amplifier yog siab tshaj qhov ntsuas input theem, ntxig ib tug ruaj attenuator, nws tus nqi yog: tiag tiag input theem - rated input theem=inserted attenuator tus nqi.
Qhov tseeb, qhov nce ntawm amplifying module nyob rau hauv lub amplifier yog tsis adjustable. Txhawm rau hloov lub amplifier nce (los yog qib), koj yuav tsum tau kho tus nqi attenuator kom txo cov theem nkag, yog li txo cov zis theem kom ua tiav lub hom phiaj ntawm kev kho lub amplifier nce.
(2) Kev hloov kho ntawm AGC lub cev amplifier: muab AGC hloov ntawm lub amplifier nyob rau hauv phau ntawv hom, kho qhov nce potentiometer kom cov zis theem tus nqi tsim (feem ntau 98 ~ 102dBV), kho qhov nqes hav potentiometer kom cov zis. teeb liab qaij txog 3dB, thiab tom qab ntawd Teem lub AGC hloov mus rau hom tsis siv neeg, kho lub potentiometer ntawm AGC tswj chav tsev, thiab ua rau tus tsav teeb liab tso zis theem tus nqi tsim.
Xyuas seb cov zis theem thiab nqes hav ua tau raws li qhov yuav tsum tau ua. Yog tias qhov yuav tsum tau ua tsis tau, nws tuaj yeem hloov kho dua kom ncav cuag tus nqi tsim. Qhov me me ntawm amplifier tso zis theem yog, qhov zoo dua nws ua tau raws li cov kev specifications.
(3) Distribution amplifier tso zis theem teeb tsa: Txuas lub zog ntsuas lub zog mus rau qhov tso zis theem ntsuas qhov chaw nres nkoj ntawm lub tshuab xa hluav taws xob, kho qhov nce potentiometer (los yog ntxig ib qho attenuator) kom cov zis theem tus nqi tsim (feem ntau 105 ~ 108dBV), kho Qhov nqes hav potentiometer ua rau nws cov zis nqes hav ib ncig ntawm 4dB.
2. Amplifier tu
Amplifiers yog cov khoom siv tseem ceeb. Lawv feem ntau ntsia hauv thaj teb, raug tshav ntuj thiab los nag, thiab ua haujlwm tsis tu ncua ib puag ncig. Kev txhaum feem ntau tshwm sim. Yog li ntawd, lawv yuav tsum tau kuaj xyuas txhua rau lub hlis, feem ntau yog xyuas seb lub hwj chim ntawm lub tshuab hluav taws xob puas yog qhov qub, seb puas muaj flashover lossis to. , Tsawg voltage thiab lwm yam tshwm sim, seb cov connectors thiab connectors yog nyob rau hauv zoo, seb lub waterproof ntsuas yog nyob rau hauv zoo, xyuas seb lub input thiab tso zis theem yog zoo ib yam li cov kaw qhov tseem ceeb ntawm lub amplifier theem meter, thiab kam nrog. lawv nyob rau lub sijhawm yog tias pom muaj qhov txawv txav.
3. Tus neeg siv qib nrhiav kom tau thiab tu
(1) Raws li lub teb chaws tus qauv, theem tus nqi ntawm txhua channel ntawm qhov chaw nres nkoj tso zis yuav tsum yog (644) dBV, qhov sib txawv ntawm ib qho channel tsawg dua lossis sib npaug rau 10dB, thiab theem sib txawv ntawm cov channel nyob ib sab yog tsawg dua. los yog sib npaug li 2dB. Ua cov kev hloov kho, txuas lub zog ntsuas lub zog mus rau tus neeg siv lub davhlau ya nyob twg chaw nres nkoj, sim seb qib twg ua tau raws li cov kev xav tau saum toj no, thiab kho qhov nce ntawm cov khoom siv hluav taws xob thiab cov khoom siv sib txuas (distributor, splitter, equalizer, thiab lwm yam) kom tau raws li tus qauv tsim. kev xav tau.
(2) Qhov tsis ua tiav ntawm txhua qhov txuas hauv kev sib txuas hauv network yuav cuam tshuam rau ntawm tus neeg siv lub vijtsam TV, yog li nws tseem ceeb heev kom txiav txim siab sai sai ntawm qhov chaw tsis ua haujlwm.
Piv txwv li, yog tias feem ntau cov neeg siv nyob rau hauv ib cheeb tsam qhia tias muaj ib tug txhaum nyob rau hauv lub cable TV, tej zaum yuav muaj teeb meem nrog lub cev amplifier los yog cov neeg siv amplifier; lossis yog tias tsuas yog ib tus neeg siv lub tsev qhia txog qhov ua txhaum, ces tej zaum yuav muaj teeb meem nrog lub tshuab xa hluav taws xob lossis cov ceg lossis cov khoom faib khoom ntawm lub tsev; yog tias tsuas muaj ib qho Yog tias tus neeg siv ceeb toom tias muaj qhov yuam kev, ces muaj teeb meem nrog tus neeg siv lub davhlau ya nyob twg.
Feem ntau ua txhaum xws li: hloov lub voj voog thiab cov khoom tsis muaj kev tso cai; cov thawv ntawv davhlau ya nyob twg thiab cov ntsaws ruaj ruaj nrog cov crimping tsis zoo, cov teeb meem xws li tawg cores, shrinking cores, thiab luv circuits; teeb meem nrog tus neeg siv lub TV.
