VSWR nthawi zonse yakhala imodzi mwazinthu zofunika kwambiri pamakina a RF chifukwa imawonetsa magwiridwe antchito amtundu wonse wa RF.

Ngati mukugwiritsa ntchito wayilesi, ndiye kuti muyenera kuda nkhawa ndi kulumikizana pakati pa mlongoti ndi chodyetsa, chifukwa pokhapokha ngati zikugwirizana bwino, zingapangitse wayilesi yanu kuwulutsa bwino kwambiri kapena VSWR yotsika kwambiri.

Ndiye, VSWR ndi chiyani? Mwamwayi, ngakhale ndizovuta za chiphunzitso cha VSWR, nkhaniyi imatha kufotokoza lingalirolo ndi zomwe muyenera kudziwa m'njira yosavuta kumva. Ngakhale mutakhala woyamba RF, mutha kumvetsetsa tanthauzo la VSWR. Tiyeni tiyambe!

VSWR ndi chiyani?

Choyamba, tiyenera kudziwa chomwe chiri choyimira. Mafunde oyimirira amayimira mphamvu yomwe sivomerezedwa ndi katunduyo ndipo imawonekeranso pamzere wotumizira kapena wodyetsa. 

Palibe amene angafune kuti izi zichitike, chifukwa mawonekedwe a mafunde oyimilira m'malo mwa magwiridwe antchito a RF amachepetsedwa.

Ndipo tiyenera kufotokoza tanthauzo la VSWR potengera kuwerengera, ndiye chiŵerengero cha mtengo wapamwamba wa voteji pa mzere wa RF mpaka mtengo wocheperako. 

Chifukwa chake, nthawi zambiri amafotokozedwa ngati 2:1, 5:1, ∞:1, ndi zina zotero. Pamene 1:1 ikutanthauza kuti mphamvu ya RF iyi imafika pa 100%, pamene ∞:1 imatanthauza kuti mphamvu zonse zowunikira zimawonekeranso. . Zinabwera chifukwa cha kusagwirizana kwa njira zopatsirana.

Kuti muthe kupeza mphamvu yowonjezera mphamvu kuchokera ku gwero kupita ku mzere wotumizira, kapena mzere wotumizira kupita ku katundu, kukhala wotsutsa, kulowetsa ku dongosolo lina, kapena antenna, miyeso ya impedance iyenera kufanana.

Mwa kuyankhula kwina, pa dongosolo la 50Ω, gwero kapena jenereta ya chizindikiro iyenera kukhala ndi gwero la 50Ω, chingwe chotumizira chiyenera kukhala 50Ω ndipo chiyeneranso kunyamula.

M'machitidwe, pali kutayika pa chingwe chilichonse chodyetsa kapena chopatsira. Kuti muyeze VSWR, mphamvu yakutsogolo ndi kumbuyo imadziwika panthawiyo mudongosolo ndipo izi zimasinthidwa kukhala chithunzi cha VSWR. Mwanjira imeneyi, VSWR imayezedwa pamalo enaake ndipo ma voltage maxima ndi minima safunikira kutsimikiziridwa kutalika kwa mzere.

Kodi pali kusiyana kotani pakati pa SWR ndi VSWR?

Mawu akuti VSWR ndi SWR amawonekera pafupipafupi m'mabuku okhudza mafunde oyimilira m'makina a RF, ndipo anthu ambiri amadabwa kuti kusiyanitsa kwake ndi chiyani. Ndipo izi ndi zomwe mukufuna:

SWR: SWR imayimira Standing Wave Ratio. Imalongosola ma voliyumu ndi mafunde omwe akuyimilira omwe akuwonekera pamzerewu. Ndilo kufotokoza kwanthawi zonse kwa mafunde apano ndi ma voteji. Nthawi zambiri amagwiritsidwa ntchito limodzi ndi mita yomwe imagwiritsidwa ntchito kuzindikira VSWR.

VSWR: VSWR kapena ma voltage stand wave ratio amatanthauza makamaka mafunde oyima pamagetsi omwe amayikidwa pamagetsi kapena chingwe chotumizira. Mawu akuti VSWR amagwiritsidwa ntchito nthawi zambiri, makamaka pakupanga kwa RF, chifukwa ndikosavuta kuzindikira mafunde akuima kwamagetsi ndipo, nthawi zambiri, mphamvu yamagetsi ndiyofunikira kwambiri pakuwonongeka kwa zida.

Zonse m'mawu, matanthauzo a VSWR ndi SWR ndi ofanana pansi pazovuta kwambiri.

Kodi VSWR Imakhudza Bwanji RF Systems?

Pali njira zingapo zomwe VSWR ingakhudzire magwiridwe antchito a transmitter system kapena makina aliwonse omwe angagwiritse ntchito RF ndi kufananiza kofananira. Nawa mndandanda wachidule wamapulogalamu:

1. Transmitter mphamvu amplifiers akhoza kusweka - Kuchulukitsa kwamagetsi komanso kuchuluka kwapano panjira yazakudya chifukwa cha VSWR kumatha kuwononga ma transistors otulutsa.

2. Chitetezo cha PA chingachepetse mphamvu zotulutsa - Kusagwirizana pakati pa mzere wa chakudya ndi mlongoti kumabweretsa SWR yayikulu, yomwe ingayambitse njira zotetezera dera zomwe zingayambitse kuchepetsa kutulutsa, zomwe zimapangitsa kuti mphamvu yotumizira iwonongeke kwambiri.

3. Ma voliyumu apamwamba komanso omwe ali pano amatha kuwononga njira yopangira chakudya - Kukwera kwamagetsi komanso kuchuluka kwapano komwe kumachitika chifukwa cha VSWR yayikulu kumatha kuwononga njira yopangira chakudya.

4. Kuchedwa kochititsidwa ndi kusinkhasinkha kungayambitse kupotoza - Chizindikirocho chikapanda kufananizidwa ndikuwonetseredwa, chimawonetsedwanso kugwero ndipo chimatha kuwonekeranso ku mlongoti. Kuchedwa komwe kunayambika ndikofanana kuwirikiza kawiri nthawi yotumizira ma siginolo pamzere wa chakudya.

5. Kuchepetsa chizindikiro poyerekeza ndi dongosolo logwirizana bwino - Chizindikiro chilichonse chowonetsedwa ndi katundu chiziwonetsedwanso kwa chotumizira ndipo chitha kupangidwa kuti chibwererenso ku mlongoti kachiwiri, ndikupangitsa kutsika kwa ma sign.

Kutsiliza

M'nkhaniyi, tikudziwa tanthauzo la VSWR, kusiyana pakati pa VSWR ndi SWR, komanso momwe VSWR imakhudzira machitidwe a RF.

Ndi chidziwitso ichi, ngakhale simungathe kuthetsa mavuto omwe mungakumane nawo ndi VSWR, mutha kukhala ndi malingaliro omveka bwino ndikuyesera kupewa zomwe zingakubweretsereni.

Ngati mukufuna kudziwa zambiri za kuwulutsa pa wailesi, titsatireni!