Pano pane zvirongwa zvekuvaka nekuvaka zveTurnstile antenna yandinoshandisa kutaurirana muchadenga pane 2 metres amateur radio bhendi.

Iyo Turnstile antenna ine chiratidziro pasi payo inogadzira antenna yakanaka yekutaurirana kwenzvimbo nekuti inogadzira denderedzwa polarized chiratidzo pateni uye zvakare ine yakafara, yakakwirira kona pateni. Nekuda kwehunhu uhu, hapana kudiwa kutenderedza antenna.

Zvinangwa zvangu zvekugadzira zvaive zvekuti yaifanira kunge yakachipa (zvechokwadi!) Uye yakagadzirwa kubva kune zvigadzirwa zvinopihwa zviri nyore. Mukutarisa mamwe masitaera egedhi antenna, chinhu chimwe chagara chichindinetsa ndechekuti vanoshandisa coax (isina-yakaenzana feedline) pamwe nekudyisa yakatwasuka antenna (yakanyatso kurongeka). Zvinoenderana nemabhuku eantenna, mamiriro ezvinhu aya anowanzo gadzira iyo coax kupenya, uye kushatirisa iyo yakazara radiation pateni yeantenna.

The Antenna

Zvandakasarudza kuita kushandisa "peta dipoles" pane zvakajairwa. Mushure meizvozvo dyisa antenna yegedhi ine 1/2 wavelength 4: 1 coaxial balun. Iri rudzi rwebalun zvakare rinotarisa nezve "chiyero-kune-kusagadzikana" nyaya inowanzosangana zvakare.

Dhirowa yakanyorwa pazasi inoratidza maitiro ekugadzira gedhi antenna. Ndokumbira utarise, iyi haisi yekusiyana.

Kuvakwa kwegedhi rekuratidzira antenna ine 2 1/2 wavelength yakatwasuka dipoles inotamiswa 90 madhigirii kubva kune akasiyana akasiyana (senge X hombe). Wobva wadyisa imwe dipole 90 madhigirii kunze kwechikamu chechipiri. Rimwe dambudziko neTurnstile Reflector antennas nderekuti chimiro chekusimudza chikamu chekuratidzira chinogona kuoma.

Sezvineiwo (vamwe vangasabvumirana) Ndakasarudza kuvaka antenna yangu yekutendeuka muimba yangu yepamusoro. Izvi zvinogadzirisa rimwe dambudziko mukuti iniwo handifanire kunetsekana nazvo ndiko kumisa antenna.

Kune akapetwa dipoles ndakashandisa 300 ohm terevhizheni twinlead. Chandaive nacho chaive chakaderedzwa kurasikirwa "foam" mhando. Iyi chaiyo yakapetwa kaviri inotungamira ine chiyero che 0.78.

Iwe unozoona zvakare mune iyo iri pamusoro dhizaini kuti saizi ye dipole hazvisi izvo zvaungatarisira kwemamita maviri. Uhwu ndihwo hurefu hwandakasunga pandakapedza kugadzirisa kune shoma SWR. Sezviri pachena iyo chiyero cheiyo nhamba ye twinlead mune resonance ye dipole rakapetwa. Sezvavanotaura, "Mileage yako inogona kusiyana" pakureba uku. Ini ndodawo kutaura kuti mumufananidzo pamusoro peiyo feedpoint yeakapetwa dipoles iri pakati peiyo yakapetwa dipole. Ndakagadzira mufananidzo nenzira iyi kuti ijekeswe.

The Reflector

Kuti uwane iyo radiation pateni mune yekumusoro mirairo yekutaurirana kwemuchadenga antenna inotendeuka inoda ratidziri pazasi payo. Kune yakafara pateni mabhuku eantenna anokurudzira 3/8 wavelength (30 inches) pakati pechiratidziro negedhi. Chigadzirwa chandakanhonga chekuratidzira chakajairwa hwindo repamba rinoratidza iwe unogona kutora muchitoro chehardware.

Ita shuwa kuti isimbi sikirini sezvo paine isiri-simbi yemhando yehwindo skrini yavanopa zvakare. Ndakatenga zvakakwana kutsanangura 8 tsoka sikweya pamadziro eimba yangu yepamusoro. Chitoro chehardware hachina kukwanisa kundipa chinhu chihombe pane chimwe nechimwe cheizvi, saka ndakaputira zvinhu zvekuratidzira nerutsoka pajoinhi. Kubva pakati pechiratidziro, ndakayera masendimita makumi matatu (30/3 wavelength). Apa ndipo panorara pakati, kana kuenda mhiri kwechinhu che dipoles akapetwa.

The Phasing Harness

Izvi hazvina kuitwa zvakaoma zvachose. Hachisi chinhu chimwezve kuti chimedu che300 ohm twinlead chiri chemagetsi 1/4 wavelength pakureba. Mumamiriro angu ezvinhu, nechiyero chakasiyana che 0.78 kureba i15.75 inches.

The Feedline

Ini ndakagadzira 4: 1 coaxial balun kuti ienderane neyekudyisa kune antenna Mumufananidzo wakanyorwa pazasi mune ruzivo rwekuvaka.

Shandisa yemhando yepamusoro, yakaderera kurasikirwa coax kana uine nzira refu yekumhanyisa yako feedline. Mune yangu, ini ndaingoda tsoka gumi neshanu dze coax saka ndakashandisa RG-15/ U coax. Izvi hazviwanzo kutaurwa, asi neiyo feedline pfupi iyi pane isingasviki 8 db kurasikirwa. Izvo zviyero zve loophole zvinoenderana nevelocity factor ye coax inoshandiswa. Batanidza iyo coaxial balun kune feedpoint yeinotendeuka antenna, sezvakaratidzwa mumufananidzo uri pamusoro.

The Migumisiro

Ndiri kufadzwa zvakanyanya nekushanda kweiyo antenna. Nekuti ini ndaisada mari yakawedzerwa yeAZ/EL rotor, ndakanyatsonzwa ndakakodzera kutenga Mirage preamplifier. Kunyangwe pasina preamplifier, iyo MIR spacecraft, pamwe neISS yakazara kunyarara mune yangu inogamuchira kana ine chekuita ne20 deg. kana mukuru mudenga. Nekusanganisira preamplifier, iwo akazara chiyero paS-mita panenge 5-10 deg. pamusoro pemaonero.