Hauv kev sib txuas lus hauv xov tooj cua, RF lim yog cov khoom siv hluav taws xob tseem ceeb heev. Hauv xov tooj cua signals kis tau tus mob, yuav ib txwm muaj bands peb tsis xav tau, xws li ib co tsis tsim nyog spurious signals; los yog tej zaum yog vim li cas tshwj xeeb, peb tsis xav tau qee qhov ntau zaus hauv xov tooj cua signals. Lub sijhawm no, peb yuav tsum tau lim tawm qhov tsis xav tau ntau zaus los ntawm RF lim. Yog li yam khoom siv hluav taws xob zoo li cas Lub lim RF thiab vim li cas nws thiaj tseem ceeb? Qhov kev qhia no yog los teb cov lus nug no.
Kev sib koom yog Kev Saib Xyuas!
RF Filter yog dab tsi
RF lim yog lub lim hluav taws xob, uas yog siv los tshem tawm lossis khaws qee qhov ntau zaus hauv xov tooj cua. Nws feem ntau yog siv los ua cov teeb liab hauv thaj tsam ntawm MHz rau KHz (MF rau EHF). Nws yog siv rau cov khoom siv xov tooj cua tshaj tawm, cov khoom siv sib txuas lus wireless, cov khoom siv hauv TV, suav nrog ntau yam kev xa tawm thiab cov receivers. Nws yog siv los xyuas kom meej tias qee yam ntawm cov cim tsis tsim nyog spurious yuav tsis raug xa mus rau hauv kev tshaj tawm, thiab ntu ntawm cov teeb liab yuav tsum tau khaws cia.
Hauv xov tooj cua tshaj tawm, RF lim yog ib qho tseem ceeb ntawm cov khoom siv hluav taws xob, vim hais tias hauv xov tooj cua cov cim, ntxiv rau qhov peb xav tau, muaj lwm yam uas peb tsis xav tau. Yog li ntawd, peb xav tau RF lim kom tshem tawm qhov tsis xav tau. Yog tias koj xav tau siv lub lim RF los ua haujlwm hauv FM ntau, paub meej tias qhov kev sib tw dhau los lossis kev txwv ntau zaus tau cim rau ntawm RF lim yog nyob rau hauv thaj tsam ntawm 88 - 108MHz.
Muaj nuj nqi ntawm txawv RF Lim
Feem ntau hais lus, cov ntxaij lim dej sib txawv muaj plaub txoj haujlwm hauv xov tooj cua tshaj tawm
Tsawg Pass Lim Lim
Low pass filter yog lub lim uas tsuas tso cai rau qis zaus dhau mus. Nws yuav txiav tawm cov zaus band siab dua ib qho zaus. Qhov no ntawm qhov zaus band yuav raug txwv thiab tsis pub dhau mus.
Nws feem ntau yog siv los lim cov suab nrov los ntawm cov kab hluav taws xob sab nraud hauv cov suab paj nruag. Lub suab teeb liab ua tiav los ntawm qhov qis dhau lim dej muaj qhov zoo meej.
Muaj Cov Lim Dej Siab Heev
On qhov tsis tooj, lub high pass lim tsuas yog tso cai rau ntau zaus dhau los thiab txiav tawm cov zaus band hauv qab qee zaus. Lub suab teeb liab nyob rau hauv no band yuav raug suppressed.
Nws feem ntau yog siv los tshem tawm cov ntses bass thaj tsam ntawm cov neeg hais lus me me, yog li lub lim dej siab dhau feem ntau ua rau hauv tus hais lus.
Qhab kis lim
Bandpass lim yog lub lim dej uas tso cai rau qee yam ntawm cov cim zaus dhau los thiab ua rau lwm cov cim uas tsis yog nyob rau ntawm qhov zaus band. Qhov ntau zaus uas tuaj yeem hla tau tuaj yeem xaiv tau dawb thiab tuaj yeem yog ob qhov tsis sib xws ntawm ntau zaus.
Nws yog feem ntau siv hauv wireless receivers thiab transmitters. Nws lub luag haujlwm tseem ceeb hauv lub transmitter yog txo qis qhov tsis tseem ceeb ntawm cov khoom tso tawm kom cov ntaub ntawv tsim nyog tuaj yeem xa mus rau ntawm qhov xav tau ceev thiab daim ntawv hauv qhov txwv bandwidth. Hauv lub receiver, nws lub luag haujlwm tseem ceeb yog tso cai rau qhov xav tau ntawm ntau zaus thiab txiav tawm cov cim ntawm lwm zaus. Los ntawm kev ua cov lim bandpass, lub teeb liab zoo tuaj yeem txhim kho kom zoo tshaj plaws thiab kev sib tw thiab kev cuam tshuam ntawm cov teeb liab tuaj yeem raug txo.
Band nres lim
Lub muaj nuj nqi ntawm lub bandstop lim yog opposite rau ntawm lub bandpass lim. Nws yog ib lub lim uas tsuas yog suppresses ib tug ntau yam ntawm frequencies. Nws txoj haujlwm zoo ib yam li cov lim bandpass, tab sis lawv ua haujlwm sib txawv.
Feem ntau hais lus, tsis hais seb hom lim nws yog dab tsi, nws yog ib qho khoom siv hluav taws xob uas tso cai rau lub teeb liab hla nrog kev pab los ntawm passband. Nyob rau hauv luv luv, nws yog ib qho khoom siv hluav taws xob uas tsis lees paub qhov kev lees paub ntawm cov teeb liab ntawm qee qhov ntau zaus thiab tso cai rau kev hla ntawm cov cim ntawm lwm zaus.
Vim li cas RF Filter tseem ceeb?
Peb paub tias lub luag haujlwm ntawm RF lim yog tso cai rau qee qhov ntau zaus kom dhau thiab tiv thaiv lwm zaus dhau los. Tab sis lub ntsiab lus ntawm qhov no yog dab tsi?
- Txhim kho qhov zoo ntawm cov teeb liab - Hauv xov tooj cua tshaj tawm, tom qab siv lub lim RF kom raug, cov teeb liab cuam tshuam los ntawm kev sib txuas lus tuaj yeem tiv thaiv tau yooj yim, kom qhov zoo ntawm cov teeb liab zaus yuav tsum tau khaws cia.
- Tsis txhob cuam tshuam ntau zaus - Piv txwv li, kev sib txuas lus hauv xov tooj yuav tsum tau muaj qee qhov zaus ntawm cov kab hluav taws xob ua haujlwm ib txwm ua. Yog tias tsis muaj qhov tsim nyog RF lim, cov teeb liab ntawm ntau zaus bands yuav tsis tuaj yeem muab kev pabcuam tib lub sijhawm, suav nrog Ntiaj Teb Kev Tshawb Fawb Satellite System, kev nyab xeeb rau pej xeem, Wi-Fi, thiab lwm yam.
Nyob rau hauv luv luv, nws muaj peev xwm nce qhov kev faib ua feem ntawm cov cim qhia ntawm yuav tsum tau frequencies nyob rau hauv lub xov tooj cua teeb liab los ntawm suppressing lub teeb liab ntawm ib co zaus, thiaj li mus txhim kho lub fidelity ntawm lub xov tooj cua signals.
xaus
Koj puas khiav koj lub xov tooj cua? Thiab koj puas yuav tsum tau yuav qee cov ntxaij lim dej tsim nyog rau koj cov khoom siv xov tooj cua tshaj tawm? RF lim los ntawm FMUSER yog koj qhov kev xaiv zoo tshaj plaws! Raws li cov kws tshaj lij cov khoom siv hauv xov tooj cua, peb muab cov khoom ua tiav zoo passive Cheebtsam thiab yuav muab cov kev daws teeb meem pheej yig rau koj raws li koj qhov xwm txheej. Yog tias koj muaj kev xav tau hauv xov tooj cua tshaj tawm, thov koj xav tau hu rau peb.
