Anan akwai tsare-tsaren gini da gina eriyar Turnstile wacce nake amfani da ita don sadarwar sararin samaniya akan rukunin rediyo mai son mita 2.

Eriya mai jujjuyawa mai nuni a ƙarƙashinsa tana samar da eriya mai kyau don sadarwar yanki saboda tana haifar da siginar siginar da'ira kuma tana da fa'ida, babban tsarin kusurwa. Sakamakon waɗannan halayen, babu buƙatar juya eriya.

Makasudin zane na shine cewa dole ne ya zama mai arha (tabbas!) Kuma an yi shi daga samfuran da aka bayar da kyau. A cikin duba wasu salon eriyar ƙofar, abu ɗaya da ya dame ni koyaushe shine suna amfani da coax (layin abinci mara daidaituwa) da kuma ciyar da eriya madaidaiciya (daidaitaccen kaya). Dangane da littattafan eriya, wannan yanayin yakan haifar da ƙirƙira coax don haskakawa, da kuma tayar da jimillar yanayin hasken eriya.

Antenna

Abin da na zaɓa in yi shi ne in yi amfani da "folded up dipoles" maimakon na al'ada. Bayan haka ciyar da eriyar ƙofar tare da 1/2 zangon 4: 1 coaxial balun. Wannan nau'in balun kuma yana kula da batun "ma'auni-da-rashin daidaituwa" da aka saba samu ma.

Hoton da aka jera a ƙasa yana nuna yadda ake yin eriyar ƙofar. Da fatan za a kula, wannan ba don kewayawa ba ne.

Gina eriyar mai nuna kofa ta ƙunshi 2 1/2 madaidaiciya madaidaiciya dipoles waɗanda ke daidaita digiri 90 daga juna daban-daban (kamar babban X). Sa'an nan kuma ciyar da daya dipole 90 digiri daga lokaci na 2nd daya. Matsala ɗaya tare da eriyar Turnstile Reflector ita ce tsarin da za a riƙa ɗaukar ɓangaren mai nuni na iya zama da wahala.

An yi sa'a (wasu na iya rashin yarda) Na zaɓi gina eriya ta juyi a cikin ɗaki na. Wannan yana magance wata matsala a cikin cewa ni ma bana buƙatar damuwa da kaina game da yanayin yanayin eriya.

Don folded dipoles na yi amfani da tagwayen talabijin na ohm 300. Abin da nake da shi a hannu ya rage asarar "kumfa" irin. Wannan takamaiman gubar guda biyu yana da ƙimar ƙimar 0.78.

Tabbas za ku kuma lura a cikin hoton da ke sama cewa girman dipole ba shine abin da tabbas za ku yi tsammani na mita 2 ba. Wannan shine tsayin da nayi lokacin da na gama gyarawa don ƙaramin SWR. A bayyane yake ƙimar ƙimar lambobi tagwaye a cikin sautin murɗaɗɗen dipole. Kamar yadda suke cewa, "Milejin ku na iya bambanta" akan wannan tsayin. Hakanan zan iya ambaton cewa a cikin kwatancin akan madaidaicin madaidaicin dipoles a zahiri yana tsakiyar folded up dipole. Na yi zane ta wannan hanya don tsabta.

Mai Tunani

Domin samun tsarin radiation a cikin umarnin sama don sadarwar sararin samaniya, eriya mai juyawa tana buƙatar mai nuni a ƙarƙashinsa. Don faffadan tsari littattafan eriya suna ba da shawarar tsawon zango 3/8 (inci 30) a tsakanin mai nuni da ƙofar. Samfurin da na zabo don mai nuni shine nunin tagar gida na yau da kullun da zaku iya ɗauka a kantin kayan masarufi.

Tabbatar cewa allon ƙarfe ne saboda akwai nau'in allo wanda ba na ƙarfe ba wanda suke bayarwa kuma. Na sayi isasshe don fayyace murabba'in ƙafa 8 akan rafters na soro na. Kantin sayar da kayan masarufi ba zai iya ba ni babban abu ɗaya ga kowane ɗayan wannan ba, don haka sai na haɗe abubuwan nuni ta game da ƙafa akan haɗin gwiwa. Daga tsakiyar mai nuni, na auna sama da inci 30 (tsayin 3/8). Wannan shi ne inda tsakiya, ko ketare factor na folded dipoles kwanta.

The Phasing Harness

Wannan ba a sanya shi mai rikitarwa kwata-kwata. Ba komai ba ne fiye da yanki na 300 ohm twinlead wanda shine tsayin igiyoyin lantarki 1/4 tsawon. A halin da nake ciki, tare da madaidaicin ƙimar 0.78 tsayin shine inci 15.75.

The Feedline

Na gina 4: 1 coaxial balun don dacewa da layin ciyarwa zuwa eriya A cikin zanen da aka jera a ƙasa shine bayanin ginin.

Yi amfani da babban inganci, ƙarancin asara coax idan kuna da doguwar hanya don gudanar da layin ciyarwar ku. A cikin akwati na, kawai na buƙaci ƙafa 15 na coax don haka na yi amfani da RG-8/ U coax. Ba yawanci ana ba da shawarar wannan ba, duk da haka tare da layin ciyarwa wannan taƙaitaccen an sami asarar ƙasa da 1 db. Ma'aunai don madauki sun dogara da yanayin saurin coax da aka yi amfani da shi. Haɗa balun coaxial zuwa wurin ciyarwar eriyar juyawa, kamar yadda aka nuna a hoton da ke sama.

Sakamakon

Na yi matukar farin ciki da ingancin wannan eriya. Saboda ban buƙaci ƙarin kashe kuɗi na mai rotor AZ/EL ba, na ji da gaske na sami barata a siyan na'urar tantancewa ta Mirage. Ko da ba tare da preamplifier ba, jirgin sama na MIR, da kuma ISS sun cika shuru a cikin mai karɓa na lokacin da zasu yi da 20 deg. ko mafi girma a cikin sama. Ta haɗa da preamplifier, suna da cikakken sikelin akan S-mita a kusan 5-10 deg. sama da hangen nesa.