Gadzira Phasing Harness yePiling Antennas

Nguva pfupi yadarika, kubasa, ndakave nemukana (kana chinodiwa) kugadzira harness yekumisa yeantenna-bay. Zvisinei, ndakanga ndine dambudziko. Ini ndakawana online makore mashoma kumashure chaizvo maitiro ekuita izvi kune yangu imwe antenna mamiriro, nhasi webhusaiti yaenda! Saka ndaifanira kuzvionera ndega. Mushure memaawa akawanda ekutarisa zvinyorwa zvangu (zvakashata), ndakazvifunga.

Chandaive nacho yaive seti yedenderedzwa polarized antenna yaizogadzwa sembiri-bay antenna system. Antenna imwe neimwe yaive nekurwisa kwe100 ohms. Pazasi pane zvandakauya nazvo, uye zvakare zvinoita kunge zvinoshanda.

Mune mutsara wekutapurirana, senge coax, iyo insusceptibility yemutoro inodzokorora yega yega hafu yewavelength. Nekuti antenna yega yega inokwenenzverwa ku100 ohms pakuzunguzika, chandinofanira kuita kudzikisa kureba huviri hwecoax chaizvo kune yakati wandei yehafu yewavelength, pamwe nekuabatanidza neadapter yeTee. Izvo izvi zvinotora iwo maviri 100 ohm impedances yeantenna yega yega uye anoaisa akafanana neimwe neimwe. Mhedzisiro ndeye 50-ohm feed point, iyo inondigonesa kubatanidza yangu 50-ohm coax yemutambo chaiwo.

Zvisinei, pane dambudziko rimwe chete. Kana coax ichigadzirwa, pane 10% kuramba mukumhanya kweiyo coax. Saka kana ndiri ini ndine hanya, kungotora yakaburitswa velocity musiyano weiyo coax inogona kunetsa. Saka ndaida nzira yekuyera kana kuonesa masaizi akavanzika ecoax kune mamwe akawanda ehafu yewavelength.

Uchishandisa nhoroondo, pazasi pane chinomiririra chakafanana neantenna system yandanga ndichimisa. Izvo zvinhu zviviri zve coax zvandaifanira kudzikisa zvakanyanya zvinoiswa se "Phasing Harness":

Saka zvandaive nazvo paruoko yaive Belden 8237 RG-8-U Kind coax. Izvi zvine chiyero chakasiyana che0.66 uye zvakare imwe impedance ye52 ohms. Saka zvichibva panhamba idzi, pamwe nekupatsanurana pakati pemaantenna bays, ndakasarudza kushandisa saizi yecoax iyo inokwana 7 makumi mashanu muzana yavelengths kureba. Chaizvoizvo, iyi inzira yakarebesa kune zvandinoda, asi izvo zvakanaka.

Hezvino izvo zvandauya nazvo, ini ndichatevedzera ese antennas pakudengenyeka neasina-reactive 100-ohm resistor. Saka ini ndakagadzira yangu yangu dummy mijenya mukati merudzi rwechirume-N yekubatanidza, pamwe nekuseri kwechikadzi rudzi-N adapta. Zvadaro, ndakasarudza magetsi makumi mashanu muzana kureba kwechidimbu coax ndichishandisa fomura yekunamatira:

L (inches) = (5904 * VelFactor) / Freq. (mHz)

Izvi zvinokupa iwe saizi yeimwe makumi mashanu muzana wavelength. Mumamiriro angu ezvinhu, ndakasarudza 7 makumi mashanu muzana wavelengths, saka ndakawedzera mhedzisiro ne7, ndokuwedzera 15%. Iyi saiti zvakareba nemaune saka ndinogona kuiisa mune yaunoda frequency. Kune rumwe rutivi rwekokisi, ndakaisa chiteshi pairi. Mumwe mugumo ndiwo magumo kuti ini ndichanyatsogadziriswa kusvika pakukura. Saka pamagumo aya, ndinoisa adapta pairi, zvisinei, ini handiitengese, izvo zvakanaka kuyera kwenguva pfupi kureba kwayo.

Heino ratidziro yegadziriro yangu yebvunzo ndichishandisa MFJ-209 antenna analyzer:

Tanga tsika yako kufamba zvishoma pamusoro pezvaunoda, wobva watanga kukwesha uchikwira-pasi. Sezvo iwe uchiridza ne frequency siyana, iwe zvechokwadi uchawana chinhu icho SWR inoenda kunenge 1 kusvika 1. Kazhinji ini ndinofambisa iyo yenguva kanoverengeka kune nadir yeSWR mumativi ese. Izvi zvinovimbisa chaiyo frequency kuongororwa kweiyo coax. Tora pasi nguva dzose.

Tevere, cheka iyo coax neinch, uye dzokorora matanho ari kumusoro kusvika SWR yanyura paiyo chaiyo frequency yakafanana nemaantenna ako ane simba. Ita izvi kune zvese zviri zviviri zvinhu zve coax, izvo zvinoumba harness yekumisa.

Paunenge wapedza nezvimedu zviviri zvecoax, iwe parizvino une tambo yakapedzwa yakarongedzwa kune chaiyo yakafanana yakajairika yeantennas ako.

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