{"id":1400,"date":"2026-06-29T03:31:32","date_gmt":"2026-06-29T03:31:32","guid":{"rendered":"https:\/\/worm-and-worm-wheel.com\/?p=1400"},"modified":"2026-06-29T03:31:32","modified_gmt":"2026-06-29T03:31:32","slug":"worm-and-worm-wheel-for-antenna-positioner-and-satellite-dish-drives","status":"publish","type":"post","link":"https:\/\/worm-and-worm-wheel.com\/cs\/worm-and-worm-wheel-for-antenna-positioner-and-satellite-dish-drives\/","title":{"rendered":"\u0160nek a \u0161nekov\u00e9 kolo pro pohony ant\u00e9nn\u00edch polohova\u010d\u016f a satelitn\u00edch parabol"},"content":{"rendered":"
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Korea Ever-Power \u00b7 Pr\u016fvodce aplika\u010dn\u00edm in\u017een\u00fdrstv\u00edm<\/p>\n

\u0160nek a \u0161nekov\u00e9 kolo pro pohony ant\u00e9nn\u00edch polohova\u010d\u016f a satelitn\u00edch parabol<\/h1>\n

Pozemsk\u00e1 stanice v p\u00e1smu Ka s ant\u00e9nou o pr\u016fm\u011bru 1,2 metru m\u00e1 \u0161\u00ed\u0159ku paprsku 0,6 stupn\u011b. Dru\u017eice se nach\u00e1z\u00ed 36 000 km daleko na geostacion\u00e1rn\u00ed ob\u011b\u017en\u00e9 dr\u00e1ze. Pokud m\u00e1 \u0161nekov\u00fd soukol\u00ed poh\u00e1n\u011bj\u00edc\u00ed azimut\u00e1ln\u00ed osu ant\u00e9ny v\u016fli 4 \u00fahlov\u00fdch minut, chyba zam\u011b\u0159ov\u00e1n\u00ed spot\u0159ebov\u00e1v\u00e1 11 procent \u0161\u00ed\u0159ky paprsku \u2013 co\u017e sni\u017euje sign\u00e1l o 0,5 dB a potenci\u00e1ln\u011b vede k poklesu spojen\u00ed pod minim\u00e1ln\u00ed prahovou hodnotu pom\u011bru nosn\u00e9 k \u0161umu. Na frekvenc\u00edch v p\u00e1smu Ka je v\u016fle \u0161nekov\u00e9ho soukol\u00ed komunika\u010dn\u00edm parametrem, nikoli pouze mechanickou specifikac\u00ed.<\/p>\n

Promluvte si s technikem ant\u00e9nn\u00edho pohonu \u2192<\/a><\/p>\n<\/div>\n

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Rychl\u00e1 odpov\u011b\u010f<\/div>\n

Polohovac\u00ed za\u0159\u00edzen\u00ed ant\u00e9n a syst\u00e9my pro sledov\u00e1n\u00ed satelitn\u00edch parabol pou\u017e\u00edvaj\u00ed \u0161nekov\u00e9 p\u0159evody pro pohony azimut\u00e1ln\u00ed (horizont\u00e1ln\u00ed) a eleva\u010dn\u00ed (vertik\u00e1ln\u00ed) osy, proto\u017ee samosvorn\u00e9 mechanismy dr\u017e\u00ed \u00fahel nato\u010den\u00ed ant\u00e9ny proti v\u011btru bez pou\u017eit\u00ed motoru, vysok\u00fd p\u0159evodov\u00fd pom\u011br poskytuje jemn\u00e9 \u00fahlov\u00e9 rozli\u0161en\u00ed z kompaktn\u00edho motoru a 90stup\u0148ov\u00e1 geometrie se hod\u00ed do konstrukce podstavce. Tabulka rozpo\u010dtu p\u0159esnosti zam\u011b\u0159ov\u00e1n\u00ed mapuje frekven\u010dn\u00ed p\u00e1smo (C, Ku, Ka) a pr\u016fm\u011br paraboly na \u0161\u00ed\u0159ku paprsku, maxim\u00e1ln\u00ed povolenou chybu zam\u011b\u0159ov\u00e1n\u00ed, a tedy i maxim\u00e1ln\u00ed v\u016fli \u0161nekov\u00e9ho p\u0159evodu \u2013 co\u017e ukazuje, \u017ee syst\u00e9my v p\u00e1smu C toleruj\u00ed 6 a\u017e 10 \u00fahlov\u00fdch minut v\u016fle, zat\u00edmco syst\u00e9my v p\u00e1smu Ka vy\u017eaduj\u00ed m\u00e9n\u011b ne\u017e 2 \u00fahlov\u00e9 minuty. N\u00e1mo\u0159n\u00ed stabilizovan\u00e9 ant\u00e9ny p\u0159id\u00e1vaj\u00ed nep\u0159etr\u017eit\u00fd sledovac\u00ed re\u017eim (s korekc\u00ed na klopen\u00ed, stoup\u00e1n\u00ed a st\u00e1\u010den\u00ed lodi), kter\u00fd produkuje 5 a\u017e 15 milion\u016f cykl\u016f polohov\u00e1n\u00ed ro\u010dn\u011b \u2013 re\u017eim \u00fanavov\u00e9ho zat\u00ed\u017een\u00ed srovnateln\u00fd s pohony st\u00e1\u010den\u00ed v\u011btrn\u00fdch turb\u00edn (\u010dl\u00e1nek A35) na rozd\u00edl od kvazistatick\u00e9ho re\u017eimu pozemn\u00edch ant\u00e9n s pevn\u00fdm bodem.<\/p>\n<\/div>\n

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Pro\u010d ant\u00e9nn\u00ed pozicion\u00e9ry pou\u017e\u00edvaj\u00ed \u0161nekov\u00e9 p\u0159evody<\/h2>\n
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Polohovac\u00ed za\u0159\u00edzen\u00ed ant\u00e9ny ot\u00e1\u010d\u00ed parabolu v azimutu (0 a\u017e 360 stup\u0148\u016f horizont\u00e1ln\u011b) a elevaci (0 a\u017e 90 stup\u0148\u016f vertik\u00e1ln\u011b) a nasm\u011bruje paprsek ant\u00e9ny na satelit nebo komunika\u010dn\u00ed c\u00edl. U geostacion\u00e1rn\u00edch satelit\u016f se ant\u00e9na jednou nato\u010d\u00ed a dr\u017e\u00ed \u2013 \u0161nekov\u00e9 p\u0159evodovky jsou p\u0159esn\u00e9 polohovac\u00ed za\u0159\u00edzen\u00ed a z\u00e1mek odoln\u00fd proti v\u011btru. U satelit\u016f LEO (n\u00edzk\u00e1 ob\u011b\u017en\u00e1 dr\u00e1ha Zem\u011b) ant\u00e9na nep\u0159etr\u017eit\u011b sleduje satelit, kdy\u017e prol\u00e9t\u00e1 oblohou za 5 a\u017e 15 minut \u2013 \u0161nekov\u00e9 p\u0159evodovky jsou p\u0159esn\u00e9 servopohony pracuj\u00edc\u00ed s prom\u011bnnou rychlost\u00ed.<\/p>\n

Oba re\u017eimy vy\u017eaduj\u00ed stejn\u00e9 t\u0159i vlastnosti \u0161nekov\u00e9ho p\u0159evodu: p\u0159esn\u00e9 \u00fahlov\u00e9 polohov\u00e1n\u00ed (na \u00farovni \u00fahlov\u00fdch sekund pro vysokofrekven\u010dn\u00ed p\u00e1sma), samosvornost proti zat\u00ed\u017een\u00ed v\u011btrem na povrchu ant\u00e9ny a kompaktn\u00ed integraci podstavce.<\/p>\n<\/div>\n

\"P\u0159esn\u00e9<\/div>\n<\/div>\n
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Polohov\u00e1n\u00ed v \u00fahlov\u00e9 sekund\u011b<\/div>\n

\u0160nekov\u00fd p\u0159evod s p\u0159evodov\u00fdm pom\u011brem 360:1 a servo enkod\u00e9r poskytuj\u00ed \u00fahlov\u00e9 rozli\u0161en\u00ed pod 1 \u00fahlovou sekundu na jeden impuls enkod\u00e9ru \u2013 dostate\u010dn\u00e9 pro sledov\u00e1n\u00ed v p\u00e1smu Ka na frekvenci 40 GHz, kde je \u0161\u00ed\u0159ka paprsku 0,4 a\u017e 0,8 stupn\u011b. Vysok\u00fd p\u0159evod p\u0159ev\u00e1d\u00ed rotaci motoru na jemn\u00e9 \u00fahlov\u00e9 p\u0159\u00edr\u016fstky, kter\u00fdm motory s p\u0159\u00edm\u00fdm pohonem nemohou srovnat za stejnou cenu.<\/p>\n<\/div>\n

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Samosvorn\u00e9 proti zat\u00ed\u017een\u00ed v\u011btrem<\/div>\n

Parabola o pr\u016fm\u011bru 3,7 metru generuje ve v\u011btru o rychlosti 30 m\/s tah p\u0159ibli\u017en\u011b 4 000 N \u2013 co\u017e v azimut\u00e1ln\u00ed ose produkuje to\u010div\u00fd moment 2 000 a\u017e 3 000 N\u00b7m. Samosvorn\u00fd mechanismus dr\u017e\u00ed parabolu proti tomuto zat\u00ed\u017een\u00ed bez nap\u00e1jen\u00ed z motoru \u2013 co\u017e je nezbytn\u00e9 pro bezobslu\u017en\u00e1 vzd\u00e1len\u00e1 m\u00edsta, kde m\u016f\u017ee doch\u00e1zet k p\u0159eru\u0161ovan\u00fdm v\u00fdpadk\u016fm proudu.<\/p>\n<\/div>\n

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Integrace podstavce<\/div>\n

\u0160nekov\u00e9 p\u0159evodovka s \u00fahlem 90 stup\u0148\u016f umis\u0165uje motor uvnit\u0159 trubky podstavce, zat\u00edmco v\u00fdstup poh\u00e1n\u00ed azimut\u00e1ln\u00ed nebo eleva\u010dn\u00ed p\u0159evodovku \u2013 \u010d\u00edm\u017e se motor dr\u017e\u00ed mimo otvor ant\u00e9ny (kter\u00fd by blokoval r\u00e1diov\u00fd sign\u00e1l). \u017d\u00e1dn\u00fd jin\u00fd typ p\u0159evodovky nedosahuje konverze kolm\u00e9 osy v r\u00e1mci ob\u00e1lky podstavce.<\/p>\n<\/div>\n<\/div>\n


\n\"materi\u00e1ly<\/p>\n

Rozpo\u010det p\u0159esnosti zam\u011b\u0159ov\u00e1n\u00ed \u2013 frekven\u010dn\u00ed p\u00e1smo a velikost paraboly vzhledem k mezn\u00ed hodnot\u011b v\u016fle \u0161nekov\u00e9ho kola<\/h2>\n

\u0160\u00ed\u0159ka paprsku ant\u00e9ny ur\u010duje, jak p\u0159esn\u011b mus\u00ed b\u00fdt ant\u00e9na zam\u011b\u0159ena \u2013 a tedy i jakou v\u016fli m\u016f\u017ee m\u00edt \u0161nekov\u00fd soukol\u00ed. \u0160\u00ed\u0159ka paprsku je nep\u0159\u00edmo \u00fam\u011brn\u00e1 jak frekvenci, tak pr\u016fm\u011bru paraboly: vy\u0161\u0161\u00ed frekvence a v\u011bt\u0161\u00ed parabola vytv\u00e1\u0159ej\u00ed u\u017e\u0161\u00ed paprsek, kter\u00fd vy\u017eaduje p\u0159esn\u011bj\u0161\u00ed zam\u011b\u0159en\u00ed. Rozpo\u010det na p\u0159esnost zam\u011b\u0159en\u00ed p\u0159id\u011bluje zlomek (obvykle 10 a\u017e 20 procent) \u0161\u00ed\u0159ky paprsku v\u016fli \u0161nekov\u00e9ho soukol\u00ed \u2013 zb\u00fdvaj\u00edc\u00ed rozpo\u010det je rezervov\u00e1n pro struktur\u00e1ln\u00ed pr\u016fhyb, tepelnou rozta\u017enost a ohyb zp\u016fsoben\u00fd v\u011btrem.<\/p>\n

\n\n\n\n\n\n\n\n\n
P\u00e1smo \/ frekvence<\/th>\nPr\u016fm\u011br tal\u00ed\u0159e 1,2 m<\/th>\nPr\u016fm\u011br tal\u00ed\u0159e 2,4 m<\/th>\nPr\u016fm\u011br tal\u00ed\u0159e 3,7 m<\/th>\nMaxim\u00e1ln\u00ed v\u016fle p\u00e1ru \u0161nek\u016f<\/th>\nPot\u0159ebn\u00fd typ p\u00e1ru<\/th>\n<\/tr>\n<\/thead>\n
C-p\u00e1smo (6 GHz)<\/td>\nPaprsek 2,9\u00b0<\/td>\nPaprsek 1,5\u00b0<\/td>\nPaprsek 1,0\u00b0<\/td>\n6 \u2013 10 \u00fahlov\u00fdch minut<\/td>\nStandardn\u00ed (nep\u0159edinstalovan\u00e9)<\/td>\n<\/tr>\n
Ku-p\u00e1smo (14 GHz)<\/td>\nPaprsek 1,2\u00b0<\/td>\nPaprsek 0,6\u00b0<\/td>\nPaprsek 0,4\u00b0<\/td>\n2 \u2013 5 \u00fahlov\u00fdch minut<\/td>\nT\u011bsn\u00fd standardn\u00ed nebo duplexn\u00ed<\/td>\n<\/tr>\n
Ka-p\u00e1smo (30 GHz)<\/td>\nPaprsek 0,6\u00b0<\/td>\nPaprsek 0,3\u00b0<\/td>\nPaprsek 0,2\u00b0<\/td>\n1 \u2013 2 \u00fahlov\u00e9 minuty<\/td>\nPovinn\u00e9 p\u0159edinstalovan\u00e9 oboustrann\u00e9 tiskov\u00e9 za\u0159\u00edzen\u00ed<\/td>\n<\/tr>\n
Sledov\u00e1n\u00ed V-band \/ LEO<\/td>\nPaprsek 0,3\u00b0<\/td>\nPaprsek 0,15\u00b0<\/td>\nPaprsek 0,1\u00b0<\/td>\n< 1 \u00fahlovou minutu (< 60 \u00fahlov\u00fdch sekund)<\/td>\nP\u0159edinstalovan\u00fd + zp\u011btn\u00e1 vazba od enkod\u00e9ru<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Tabulka rozpo\u010dtu odhaluje 10n\u00e1sobn\u00fd rozsah povolen\u00e9 v\u016fle od p\u00e1sma C (10 \u00fahlov\u00fdch minut) do p\u00e1sma V\/LEO (pod 1 \u00fahlovou minutu). \u0160nekov\u00fd p\u0159evod, kter\u00fd je dokonale dosta\u010duj\u00edc\u00ed pro termin\u00e1l VSAT v p\u00e1smu C, se st\u00e1v\u00e1 zcela nepou\u017eiteln\u00fdm pro pozemn\u00ed stanici v p\u00e1smu Ka \u2013 stejn\u00e1 mechanick\u00e1 sou\u010d\u00e1stka nespl\u0148uje komunika\u010dn\u00ed specifikaci je\u0161t\u011b p\u0159edt\u00edm, ne\u017e se v\u016fbec zohledn\u00ed to\u010div\u00fd moment nebo rychlost. Proto mus\u00ed po\u0159\u00edzen\u00ed \u0161nekov\u00e9ho p\u0159evodu ant\u00e9ny za\u010d\u00edt s RF specifikac\u00ed (frekven\u010dn\u00ed p\u00e1smo + velikost paraboly), nikoli s mechanickou specifikac\u00ed (to\u010div\u00fd moment + p\u0159evodov\u00fd pom\u011br).<\/p>\n

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N\u00e1mo\u0159n\u00ed stabilizovan\u00e1 ant\u00e9na \u2013 nep\u0159etr\u017eit\u00e9 sledov\u00e1n\u00ed za pohybu lodi<\/h2>\n

\"P\u0159esn\u00fd<\/p>\n

Pozemn\u00ed ant\u00e9ny se jednou nato\u010d\u00ed a udr\u017e\u00ed v poloze \u2013 \u0161nekov\u00fd p\u0159evod pracuje n\u011bkolik minut b\u011bhem po\u010d\u00e1te\u010dn\u00edho nastaven\u00ed a pot\u00e9 stoj\u00ed m\u011bs\u00edce nebo roky nehybn\u011b. N\u00e1mo\u0159n\u00ed stabilizovan\u00e9 ant\u00e9ny jsou opa\u010dn\u00e9: lo\u010f se nep\u0159etr\u017eit\u011b kym\u00e1c\u00ed (plus nebo m\u00ednus 15 a\u017e 30 stup\u0148\u016f), klop\u00ed (plus nebo m\u00ednus 5 a\u017e 10 stup\u0148\u016f) a vybo\u010duje (plus nebo m\u00ednus 3 a\u017e 5 stup\u0148\u016f). Polohova\u010d ant\u00e9ny se mus\u00ed ot\u00e1\u010det proti sob\u011b na obou os\u00e1ch, aby paprsek udr\u017eel nam\u00ed\u0159en\u00fd na satelit i p\u0159es pohyb lodi \u2013 nep\u0159etr\u017eit\u00e1 servosmy\u010dka b\u011b\u017e\u00ed s frekvenc\u00ed 10 a\u017e 50 korekc\u00ed za sekundu.<\/p>\n

Toto nep\u0159etr\u017eit\u00e9 sledov\u00e1n\u00ed produkuje 5 a\u017e 15 milion\u016f cykl\u016f polohov\u00e1n\u00ed p\u00e1ru \u0161nekov\u00fdch kol ro\u010dn\u011b \u2013 co\u017e je re\u017eim \u00fanavov\u00e9ho zat\u00ed\u017een\u00ed, kter\u00fd je 1 000kr\u00e1t vy\u0161\u0161\u00ed ne\u017e u pozemn\u00ed geostacion\u00e1rn\u00ed ant\u00e9ny a srovnateln\u00fd s pohony sklonu v\u011btrn\u00fdch turb\u00edn popsan\u00fdmi v \u010dl\u00e1nku A35. Materi\u00e1l p\u00e1ru \u0161nekov\u00fdch kol mus\u00ed t\u00e9to \u00fanav\u011b odolat: kola z odst\u0159ediv\u011b lit\u00e9 fosforov\u00e9 bronzy nebo hlin\u00edkov\u00e9 bronzy (u kol lit\u00fdch do p\u00edsku se v m\u00edstech p\u00f3rovitosti vyvinou \u00fanavov\u00e9 trhliny b\u011bhem 2 a\u017e 3 let n\u00e1mo\u0159n\u00ed slu\u017eby). \u0160nek mus\u00ed b\u00fdt kalen\u00fd na HRC 58+ a brou\u0161en\u00fd na Ra 0,3 \u00b5m nebo lep\u0161\u00ed \u2013 odvalovan\u00e9 \u0161neky zp\u016fsobuj\u00ed nadm\u011brn\u00fd n\u00e1r\u016fst v\u016fle p\u0159i nep\u0159etr\u017eit\u00e9m zat\u00ed\u017een\u00ed zp\u011btn\u00fdm chodem.<\/p>\n

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Pozn\u00e1mka k in\u017een\u00fdrsk\u00e9mu stolu<\/div>\n

Korejsk\u00fd v\u00fdrobce n\u00e1mo\u0159n\u00edch satelit\u016f VSAT instaloval stabilizovan\u00e9 ant\u00e9nn\u00ed syst\u00e9my pro p\u00e1smo Ku na 12 kontejnerov\u00fdch lod\u00ed. Ka\u017ed\u00e1 ant\u00e9na m\u011bla dva p\u00e1ry \u0161nekov\u00fdch p\u0159evod\u016f (azimut\u00e1ln\u00ed a eleva\u010dn\u00ed). P\u016fvodn\u00ed specifikace pou\u017e\u00edvala standardn\u00ed pr\u016fmyslov\u00e9 p\u00e1ry \u0161nekov\u00fdch p\u0159evod\u016f \u2013 modul 1,5, osov\u00e1 vzd\u00e1lenost 35 mm, pom\u011br 90:1, kolo z fosforov\u00e9ho bronzu lit\u00e9 do p\u00edsku, v\u016fle 5 \u00fahlov\u00fdch minut. Zam\u011b\u0159ovac\u00ed rozpo\u010det pro p\u00e1smo Ku p\u0159i ant\u00e9n\u011b 1,0 m vy\u017eadoval maxim\u00e1ln\u011b 3 \u00fahlov\u00e9 minuty \u2013 ji\u017e tak byla margin\u00e1ln\u00ed po\u010d\u00e1te\u010dn\u00ed v\u016fle 5 \u00fahlov\u00fdch minut. Po 18 m\u011bs\u00edc\u00edch nep\u0159etr\u017eit\u00e9ho n\u00e1mo\u0159n\u00edho sledov\u00e1n\u00ed (p\u0159ibli\u017en\u011b 7,5 milionu cykl\u016f reverzace na osu) se u 5 z 24 p\u00e1r\u016f eleva\u010dn\u00ed osy vyvinula v\u016fle nad 12 \u00fahlov\u00fdch minut \u2013 kola z bronzu lit\u00e9 do p\u00edsku m\u011bla v m\u00edstech p\u00f3rovitosti odlitk\u016f podpovrchov\u00e9 \u00fanavov\u00e9 trhliny. Kvalita sign\u00e1lu se na posti\u017een\u00fdch lod\u00edch zhor\u0161ila, co\u017e zp\u016fsobovalo ob\u010dasn\u00e9 v\u00fdpadky spojen\u00ed b\u011bhem siln\u00e9ho po\u010das\u00ed (kdy byla amplituda pohybu lodi nejvy\u0161\u0161\u00ed a p\u00e1r \u0161nekov\u00fdch p\u0159evod\u016f pracoval nejv\u00edce). Celoflotilov\u00e1 n\u00e1hrada za kola z odst\u0159ediv\u011b lit\u00e9ho hlin\u00edkov\u00e9ho bronzu (bez p\u00f3rovitosti, vynikaj\u00edc\u00ed \u00fanavov\u00e1 \u017eivotnost) a p\u0159edpjat\u00e1 duplexn\u00ed specifikace (v\u016fle pod 2 \u00fahlov\u00e9 minuty). Cena za n\u00e1hradn\u00ed p\u00e1r: 280 USD oproti 120 USD za origin\u00e1l \u2013 p\u0159\u00edplatek 160 USD. Cena za st\u00ed\u017enosti na kvalitu spojen\u00ed v r\u00e1mci cel\u00e9 flotily a v\u00fdjezdy havarijn\u00edch technik\u016f k 5 plavidl\u016fm na 3 kontinentech: p\u0159ibli\u017en\u011b 45 000 USD. Ponau\u010den\u00ed: \u0161nekov\u00e9 p\u0159evody n\u00e1mo\u0159n\u00edch ant\u00e9n mus\u00ed b\u00fdt specifikov\u00e1ny pro \u00fanavu materi\u00e1lu p\u0159i kontinu\u00e1ln\u00edm reverzn\u00edm chodu, nikoli pro statick\u00e9 zat\u00ed\u017een\u00ed v pr\u016fmyslov\u00e9m prost\u0159ed\u00ed. Pro jakoukoli ant\u00e9nu sleduj\u00edc\u00ed satelit z pohybliv\u00e9 plo\u0161iny jsou povinn\u00e1 odst\u0159ediv\u011b lit\u00e1 (nikoli do p\u00edsku lit\u00e1) kola a p\u0159edpjat\u00e1 (nikoli standardn\u00ed v\u016fle) specifikace.<\/p>\n<\/div>\n

<\/p>\n

Specifikace t\u0159\u00ed p\u00e1r\u016f \u0161nekov\u00fdch p\u0159evod\u016f pro polohov\u00e1n\u00ed ant\u00e9ny<\/h2>\n

\"p\u0159esn\u00fd<\/p>\n

P\u0159\u00edpad 1 \u2013 Korejsk\u00fd n\u00e1mo\u0159n\u00ed VSAT: Ku-p\u00e1smo, 1,0m parabola, stabilizovan\u00e1, nep\u0159etr\u017eit\u00e9 sledov\u00e1n\u00ed<\/h3>\n

Korejsk\u00fd v\u00fdrobce n\u00e1mo\u0159n\u00edch VSAT syst\u00e9m\u016f specifikoval p\u00e1ry \u0161nekov\u00fdch kol pro azimut\u00e1ln\u00ed a eleva\u010dn\u00ed osy stabilizovan\u00e9 ant\u00e9ny pro Ku-p\u00e1smo (parabola 1,0 m, uplink\/downlink 14\/12 GHz). \u0160\u00ed\u0159ka paprsku: 1,4 stupn\u011b. Maxim\u00e1ln\u00ed chyba zam\u011b\u0159ov\u00e1n\u00ed: 0,14 stupn\u011b (10 procent \u0161\u00ed\u0159ky paprsku). Rozd\u011blen\u00ed v\u016fle p\u00e1ru \u0161nekov\u00fdch kol: 0,04 stupn\u011b = 2,4 \u00fahlov\u00fdch minut. Opraven\u00e1 specifikace (po incidentu s flotilou): p\u0159edpjat\u00fd duplex, modul 1,5, osov\u00e1 vzd\u00e1lenost 35 mm, pom\u011br 90:1, brou\u0161en\u00e9 Ra 0,3 \u00b5m. Kolo: odst\u0159ediv\u011b lit\u00fd hlin\u00edkov\u00fd bronz (s \u00fanavovou odolnost\u00ed 20 milion\u016f reverzn\u00edch cykl\u016f). Efektivn\u00ed v\u016fle: 1,8 \u00fahlov\u00fdch minut. Motor: servopohon 24 V DC s absolutn\u00edm enkod\u00e9rem s 65 536 \u010d\u00edslicemi. Utahovac\u00ed moment proti v\u011btru (slo\u017een\u00e1 poloha, Beaufort 10): 450 N\u00b7m. Pouzdro: hlin\u00edk s epoxidov\u00fdm povlakem pro n\u00e1mo\u0159n\u00ed \u00fa\u010dely, IP66. Cena za p\u00e1r: 280 USD. Dv\u011b ant\u00e9ny: 560 USD. Ro\u010dn\u00ed produkce: 800 ant\u00e9nn\u00edch syst\u00e9m\u016f (1 600 p\u00e1r\u016f \u0161nekov\u00fdch p\u0159evod\u016f). Kvalita sign\u00e1lu po upgradu: \u017e\u00e1dn\u00e9 v\u00fdpadky spojen\u00ed zp\u016fsoben\u00e9 chybou zam\u011b\u0159ov\u00e1n\u00ed v cel\u00e9 flotile.<\/p>\n

P\u0159\u00edpad 2 \u2013 Sledov\u00e1n\u00ed japonsk\u00e9 dru\u017eice LEO: p\u00e1smo Ka, ant\u00e9na 3,7 m, subsekundov\u00e9 m\u011b\u0159en\u00ed, pozemn\u00ed<\/h3>\n

Japonsk\u00e1 spole\u010dnost zab\u00fdvaj\u00edc\u00ed se satelitn\u00ed komunikac\u00ed specifikovala p\u00e1ry \u0161nekov\u00fdch kol pro 3,7metrovou pozemn\u00ed stanici v p\u00e1smu Ka, kter\u00e1 sleduje satelity LEO pro \u0161irokop\u00e1smovou internetovou br\u00e1nu. \u0160\u00ed\u0159ka paprsku: 0,2 stupn\u011b. Maxim\u00e1ln\u00ed chyba zam\u011b\u0159ov\u00e1n\u00ed: 0,02 stupn\u011b = 72 \u00fahlov\u00fdch sekund. Alokace v\u016fle p\u00e1ru \u0161nekov\u00fdch kol: 15 \u00fahlov\u00fdch sekund (20 procent celkov\u00e9ho rozpo\u010dtu zam\u011b\u0159ov\u00e1n\u00ed). To bylo pod dosa\u017eiteln\u00fdm limitem p\u0159edem zat\u00ed\u017een\u00e9ho duplexu (obvykle 1 a\u017e 2 \u00fahlov\u00e9 minuty = 60 a\u017e 120 \u00fahlov\u00fdch sekund) \u2013 vy\u017eadovalo to dodate\u010dnou korek\u010dn\u00ed smy\u010dku zp\u011btn\u00e9 vazby kod\u00e9ru, kter\u00e1 m\u011b\u0159ila skute\u010dnou polohu ant\u00e9ny pomoc\u00ed p\u0159esn\u00e9ho optick\u00e9ho kod\u00e9ru namontovan\u00e9ho p\u0159\u00edmo na ose ant\u00e9ny (obch\u00e1z\u00ed v\u016fli p\u00e1ru \u0161nekov\u00fdch kol v \u0159\u00eddic\u00ed smy\u010dce). P\u00e1r \u0161nekov\u00fdch kol: p\u0159edem zat\u00ed\u017een\u00fd duplex, modul 2, osov\u00e1 vzd\u00e1lenost 50 mm, pom\u011br 360:1, lapovan\u00fd Ra 0,2 \u00b5m, t\u0159\u00edda DIN 3. Efektivn\u00ed mechanick\u00e1 v\u016fle: 45 \u00fahlov\u00fdch sekund \u2013 ale zp\u011btnovazebn\u00ed smy\u010dka kod\u00e9ru sn\u00ed\u017eila efektivn\u00ed chybu zam\u011b\u0159ov\u00e1n\u00ed pod 10 \u00fahlov\u00fdch sekund kompenzac\u00ed v\u016fle v softwaru. Kolo: odst\u0159ediv\u011b lit\u00fd c\u00ednov\u00fd bronz s p\u0159\u00eddavkem niklu. Cena za p\u00e1r: 850 USD. Dv\u011b na ant\u00e9nu: 1 700 USD. Proch\u00e1zet p\u0159esn\u00e9 \u0161nekov\u00e9 reduktory pro ant\u00e9ny<\/a> mo\u017enosti pro satelitn\u00ed sledov\u00e1n\u00ed a aplikace pozemn\u00edch stanic.<\/p>\n

P\u0159\u00edpad 3 \u2013 Vietnamsk\u00fd vys\u00edlac\u00ed uplink: p\u00e1smo C, parabola 4,5 m, pevn\u00e1 geostacion\u00e1rn\u00ed dru\u017eice, n\u00e1kladov\u011b optimalizovan\u00e9<\/h3>\n

Vietnamsk\u00fd televizn\u00ed vys\u00edlatel specifikoval p\u00e1ry \u0161nekov\u00fdch kol pro azimut\u00e1ln\u00ed a eleva\u010dn\u00ed pohony 4,5metrov\u00e9 uplinkov\u00e9 ant\u00e9ny v p\u00e1smu C, kter\u00e1 m\u00ed\u0159\u00ed na geostacion\u00e1rn\u00ed dru\u017eici. \u0160\u00ed\u0159ka paprsku: 0,8 stupn\u011b. Maxim\u00e1ln\u00ed chyba m\u00ed\u0159en\u00ed: 0,08 stupn\u011b = 4,8 \u00fahlov\u00fdch minut. \u0160t\u011bdr\u00fd rozpo\u010det pro p\u00e1smo C umo\u017e\u0148oval standardn\u00ed (nep\u0159edpjat\u00fd) p\u00e1r \u0161nekov\u00fdch kol s v\u016fl\u00ed 6 \u00fahlov\u00fdch minut \u2013 co\u017e je v r\u00e1mci alokace 4,8 \u00fahlov\u00fdch minut s rezervou. Ant\u00e9na byla p\u0159i instalaci m\u00ed\u0159ena jednou a znovu se\u0159izov\u00e1na pouze b\u011bhem ro\u010dn\u00ed \u00fadr\u017eby \u2013 v podstat\u011b nulov\u00e9 provozn\u00ed cykly za rok (nejlep\u0161\u00ed aplikace s n\u00edzk\u00fdm zat\u00ed\u017een\u00edm). P\u00e1r \u0161nekov\u00fdch kol: jednochod\u00fd, modul 3, rozte\u010d 80 mm, pom\u011br 72:1, brou\u0161en\u00fd Ra 0,4 \u00b5m. Standardn\u00ed kolo z fosforov\u00e9ho bronzu (bez po\u017eadavku na \u00fanavu materi\u00e1lu \u2013 nulov\u00e9 cyklov\u00e1n\u00ed). Utahovac\u00ed moment v\u011btru na 4,5m ant\u00e9n\u011b: 3 200 N\u00b7m (n\u00e1vrhov\u00e1 rychlost v\u011btru 35 m\/s). Pouzdro: \u017e\u00e1rov\u011b zinkovan\u00e9, IP55. Cena za p\u00e1r: 145 USD. Dv\u011b ant\u00e9ny: 290 USD. Specifikace ukazuje, \u017ee ant\u00e9ny s pevn\u00fdm bodem v p\u00e1smu C pat\u0159\u00ed mezi nejm\u00e9n\u011b n\u00e1ro\u010dn\u00e9 aplikace \u0161nekov\u00fdch p\u0159evod\u016f v jak\u00e9mkoli odv\u011btv\u00ed \u2013 ni\u017e\u0161\u00ed p\u0159esnost, ni\u017e\u0161\u00ed z\u00e1t\u011b\u017e a ni\u017e\u0161\u00ed n\u00e1klady ne\u017e indexovac\u00ed pohon balic\u00edho stroje (\u010dl\u00e1nek A16).<\/p>\n

<\/p>\n

\u010casto kladen\u00e9 ot\u00e1zky<\/h2>\n
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\nOt\u00e1zka: Jak vypo\u010d\u00edt\u00e1m rozpo\u010det na v\u016fli \u0161nekov\u00e9ho p\u0159evodu pro mou ant\u00e9nu?<\/summary>\n

Za\u010dn\u011bte s \u0161\u00ed\u0159kou paprsku 3 dB: BW = 70 \u00d7 \u03bb \/ D (stupn\u011b), kde \u03bb je vlnov\u00e1 d\u00e9lka (m) a D je pr\u016fm\u011br paraboly (m). Maxim\u00e1ln\u00ed povolen\u00e1 celkov\u00e1 chyba zam\u011b\u0159ov\u00e1n\u00ed je typicky 10 a\u017e 20 procent \u0161\u00ed\u0159ky paprsku (v z\u00e1vislosti na rozpo\u010dtov\u00e9 rezerv\u011b spoje). 20 a\u017e 30 procent celkov\u00e9 rozpo\u010dtov\u00e9 rezervy zam\u011b\u0159ov\u00e1n\u00ed p\u0159id\u011blte na v\u016fli p\u00e1ru \u0161nekov\u00fdch kol (70 a\u017e 80 procent rezervujte pro struktur\u00e1ln\u00ed pr\u016fhyb, tepelnou rozta\u017enost a ohyb v\u011btrem). P\u0159\u00edklad: P\u00e1smo Ka p\u0159i 30 GHz (\u03bb = 0,01 m), D = 2,4 m: BW = 70 \u00d7 0,01 \/ 2,4 = 0,29 stup\u0148\u016f. Celkov\u00e1 rozpo\u010dtov\u00e1 chyba p\u0159i 15 procentech: 0,044 stup\u0148\u016f = 2,6 \u00fahlov\u00fdch minut. Alokace p\u00e1ru \u0161nekov\u00fdch kol p\u0159i 25 procentech: 0,65 \u00fahlov\u00fdch minut = 39 \u00fahlov\u00fdch sekund. To vy\u017eaduje p\u0159edem na\u010dten\u00fd duplexn\u00ed p\u00e1r \u2013 standardn\u00ed p\u00e1ry nemohou dos\u00e1hnout chyby men\u0161\u00ed ne\u017e 1 \u00fahlovou minutu.<\/p>\n<\/details>\n

\nOt\u00e1zka: Pro\u010d se u n\u00e1mo\u0159n\u00edch ant\u00e9n pro sledov\u00e1n\u00ed opot\u0159ebov\u00e1vaj\u00ed \u0161nekov\u00e9 p\u0159evody rychleji ne\u017e u pozemn\u00edch ant\u00e9n?<\/summary>\n

Pozemn\u00ed geostacion\u00e1rn\u00ed ant\u00e9na uprav\u00ed polohu jednou (b\u011bhem instalace) a udr\u017e\u00ed ji \u2013 \u0161nekov\u00e9 soukol\u00ed m\u016f\u017ee prov\u00e9st m\u00e9n\u011b ne\u017e 100 cykl\u016f ur\u010dov\u00e1n\u00ed polohy ro\u010dn\u011b. N\u00e1mo\u0159n\u00ed stabilizovan\u00e1 ant\u00e9na pr\u016fb\u011b\u017en\u011b koriguje klopen\u00ed, klopen\u00ed a st\u00e1\u010den\u00ed lodi \u2013 prov\u00e1d\u00ed 10 a\u017e 50 korekc\u00ed za sekundu, 24 hodin denn\u011b, co\u017e vede k 5 a\u017e 15 milion\u016fm reverzn\u00edch cykl\u016f ro\u010dn\u011b. Toto nep\u0159etr\u017eit\u00e9 reverzn\u00ed zat\u00ed\u017een\u00ed zp\u016fsobuje kontaktn\u00ed \u00fanavu bok\u016f zub\u016f kol, pro kterou standardn\u00ed pr\u016fmyslov\u00e9 \u0161nekov\u00e9 soukol\u00ed nejsou navr\u017eeny. U bronzov\u00fdch kol odlit\u00fdch do p\u00edsku (kter\u00e1 obsahuj\u00ed mikropor\u00e9znost z procesu odl\u00e9v\u00e1n\u00ed) se v t\u011bchto m\u00edstech p\u00f3rovitosti vyvinou podpovrchov\u00e9 \u00fanavov\u00e9 trhliny b\u011bhem 2 a\u017e 3 let. Odst\u0159ediv\u011b lit\u00e1 nebo kovan\u00e1 kola (bez p\u00f3rovitosti) vydr\u017e\u00ed 8 a\u017e 12 let p\u0159i stejn\u00e9m n\u00e1mo\u0159n\u00edm sledov\u00e1n\u00ed.<\/p>\n<\/details>\n

\nOt\u00e1zka: M\u016f\u017ee zp\u011btn\u00e1 vazba enkod\u00e9ru kompenzovat v\u016fli \u0161nekov\u00e9ho p\u0159evodu p\u0159i sledov\u00e1n\u00ed ant\u00e9ny?<\/summary>\n

Ano \u2013 mont\u00e1\u017e\u00ed p\u0159esn\u00e9ho enkod\u00e9ru p\u0159\u00edmo na osu ant\u00e9ny (za p\u00e1rem \u0161nekov\u00fdch p\u0159evod\u016f) nam\u00edsto na h\u0159\u00eddel motoru (p\u0159ed p\u00e1rem). Kod\u00e9r namontovan\u00fd na ose m\u011b\u0159\u00ed skute\u010dn\u00fd \u00fahel ant\u00e9ny v\u010detn\u011b v\u016fle a servo regul\u00e1tor to kompenzuje \u00fapravou polohy motoru. Tato technika m\u016f\u017ee sn\u00ed\u017eit efektivn\u00ed chybu zam\u011b\u0159ov\u00e1n\u00ed na 10 a\u017e 20 procent mechanick\u00e9 v\u016fle \u2013 co\u017e umo\u017e\u0148uje p\u00e1ru s mechanickou v\u016fl\u00ed 3 \u00fahlov\u00fdmi minutami dos\u00e1hnout efektivn\u00edho zam\u011b\u0159ov\u00e1n\u00ed v hodnot\u011b sub-\u00fahlov\u00fdch minut. Nev\u00fdhoda: kod\u00e9ry namontovan\u00e9 na ose stoj\u00ed 800 a\u017e 3 000 USD (oproti 50 a\u017e 200 USD u kod\u00e9r\u016f na h\u0159\u00eddeli motoru) a vy\u017eaduj\u00ed p\u0159esnou mont\u00e1\u017e, kter\u00e1 zvy\u0161uje slo\u017eitost mont\u00e1\u017ee. Tento p\u0159\u00edstup je standardn\u00ed pro sledovac\u00ed syst\u00e9my v p\u00e1smu Ka a LEO, kde po\u017eadavek na zam\u011b\u0159ov\u00e1n\u00ed p\u0159ekra\u010duje mechanickou v\u016fli dosa\u017eitelnou jak\u00fdmkoli p\u00e1rem \u0161nekov\u00fdch p\u0159evod\u016f.<\/p>\n<\/details>\n

\nOt\u00e1zka: Jakou ochranu proti korozi pot\u0159ebuj\u00ed \u0161nekov\u00e9 p\u0159evody venkovn\u00ed ant\u00e9ny?<\/summary>\n

V\u011bt\u0161ina pozemn\u00edch ant\u00e9n pracuje ve standardn\u00edm venkovn\u00edm prost\u0159ed\u00ed (ISO 12944 C2 a\u017e C3), kde \u017e\u00e1rov\u011b zinkovan\u00e9 pouzdro a standardn\u00ed t\u011bsn\u011bn\u00ed zaji\u0161\u0165uj\u00ed v\u00edce ne\u017e 15 let provozu. N\u00e1mo\u0159n\u00ed ant\u00e9ny pracuj\u00ed v klasifikaci C5-M (stejn\u00e1 n\u00e1mo\u0159n\u00ed klasifikace jako pohony navij\u00e1k\u016f v \u010dl\u00e1nku A29) a vy\u017eaduj\u00ed pouzdro z nerezov\u00e9 oceli 316L nebo pouzdro s n\u00e1t\u011brem z mo\u0159sk\u00e9 oceli s t\u011bsn\u011bn\u00edmi FKM. Pob\u0159e\u017en\u00ed pozemn\u00ed ant\u00e9ny do 1 km od mo\u0159e mohou za\u017e\u00edvat podm\u00ednky C4, kter\u00e9 vy\u017eaduj\u00ed pouzdro s epoxidov\u00fdm povlakem a t\u011bsn\u011bn\u00ed EPDM. Specifikace koroze je nez\u00e1visl\u00e1 na specifikaci p\u0159esnosti zam\u011b\u0159ov\u00e1n\u00ed \u2013 ant\u00e9na v p\u00e1smu C s uvoln\u011bnou v\u016fl\u00ed st\u00e1le pot\u0159ebuje ochranu proti korozi C5-M, pokud je namontov\u00e1na na lodi.<\/p>\n<\/details>\n

\nOt\u00e1zka: Jak\u00e1 je typick\u00e1 \u017eivotnost \u0161nekov\u00e9ho p\u0159evodu polohova\u010de ant\u00e9ny?<\/summary>\n

Pozemn\u00ed geostacion\u00e1rn\u00ed: 15 a\u017e 25 let (v podstat\u011b nulov\u00e9 cyklov\u00e1n\u00ed \u2013 koroze a degradace t\u011bsn\u011bn\u00ed jsou faktory omezuj\u00edc\u00edmi \u017eivotnost). Pozemn\u00ed sledov\u00e1n\u00ed LEO: 8 a\u017e 15 let (st\u0159edn\u00ed cyklov\u00e1n\u00ed p\u0159i 500 a\u017e 2 000 stop\u00e1ch denn\u011b). N\u00e1mo\u0159n\u00ed stabilizovan\u00e1: 5 a\u017e 10 let (neust\u00e1l\u00e1 vysokocyklov\u00e1 \u00fanava \u2013 odst\u0159ediv\u011b lit\u00e1 kola se prodlu\u017euj\u00ed na 8 a\u017e 12 let). Samotn\u00fd \u0161nek ve v\u0161ech p\u0159\u00edpadech vydr\u017e\u00ed po celou dobu \u017eivotnosti ant\u00e9ny (kalen\u00e1 ocel, brou\u0161en\u00e1 povrchov\u00e1 \u00faprava, n\u00edzk\u00e9 kontaktn\u00ed nap\u011bt\u00ed). Kolo je spot\u0159ebn\u00ed materi\u00e1l \u2013 v\u00fdm\u011bnu pl\u00e1nujte ve stejn\u00e9m intervalu jako renovaci nap\u00e1jec\u00ed elektroniky ant\u00e9ny.<\/p>\n<\/details>\n<\/div>\n

<\/p>\n

\u0160nekov\u00e9 p\u0159evodov\u00e9 dvojice polohova\u010d\u016f ant\u00e9ny p\u0159eklenuj\u00ed mezeru mezi stroj\u00edrenstv\u00edm a r\u00e1diov\u00fdmi komunikacemi \u2013 v\u016fle v p\u0159evodov\u00e9m p\u00e1ru p\u0159\u00edmo ur\u010duje p\u0159esnost zam\u011b\u0159en\u00ed ant\u00e9ny, kter\u00e1 ur\u010duje kvalitu sign\u00e1lu na satelitn\u00edm spojen\u00ed. Tabulka rozpo\u010dtu p\u0159esnosti zam\u011b\u0159en\u00ed mapuje frekven\u010dn\u00ed p\u00e1smo a pr\u016fm\u011br paraboly na maxim\u00e1ln\u00ed povolenou v\u016fli \u2013 co\u017e ukazuje, \u017ee sledov\u00e1n\u00ed v p\u00e1smu Ka a LEO vy\u017eaduj\u00ed p\u0159edpjat\u00e9 duplexn\u00ed p\u00e1ry s v\u016fl\u00ed v \u0159\u00e1du sub-\u00fahlov\u00fdch minut, zat\u00edmco syst\u00e9my s pevn\u00fdm bodem v p\u00e1smu C toleruj\u00ed standardn\u00ed pr\u016fmyslov\u00e9 p\u00e1ry s v\u016fl\u00ed 6 a\u017e 10 \u00fahlov\u00fdch minut. N\u00e1mo\u0159n\u00ed stabilizovan\u00e9 ant\u00e9ny p\u0159id\u00e1vaj\u00ed \u00fanavu z kontinu\u00e1ln\u00edho reverzov\u00e1n\u00ed p\u0159i 5 a\u017e 15 milionech cykl\u016f ro\u010dn\u011b \u2013 vy\u017eaduj\u00ed odst\u0159ediv\u011b lit\u00e1 kola a p\u0159edpjatou specifikaci, kterou standardn\u00ed p\u00e1ry lit\u00e9 do p\u00edskov\u00e9 formy nemohou p\u0159e\u017e\u00edt. Pro v\u00fdrobce ant\u00e9n za\u010d\u00edn\u00e1 specifikace \u0161nekov\u00e9ho p\u0159evodov\u00e9ho p\u00e1ru rozpo\u010dtem r\u00e1diov\u00e9ho spojen\u00ed, nikoli v\u00fdpo\u010dtem mechanick\u00e9ho to\u010div\u00e9ho momentu.<\/p>\n

Pro v\u00fdrobce ant\u00e9n a spole\u010dnosti zab\u00fdvaj\u00edc\u00ed se satelitn\u00ed komunikac\u00ed na\u0161e technick\u00e9 odd\u011blen\u00ed vypo\u010d\u00edt\u00e1 rozpo\u010det pro zam\u011b\u0159ov\u00e1n\u00ed na z\u00e1klad\u011b va\u0161\u00ed RF specifikace a doporu\u010d\u00ed t\u0159\u00eddu v\u016fle \u0161nekov\u00e9ho p\u0159evodu. Standardn\u00ed katalog p\u0159esn\u00e9 \u0161nekov\u00e9 p\u0159evodovky<\/a> Pokr\u00fdv\u00e1 velikosti polohova\u010d\u016f ant\u00e9n od st\u0159edov\u00e9 vzd\u00e1lenosti 25 do 100 mm se standardn\u00edmi a p\u0159edinstalovan\u00fdmi duplexn\u00edmi mo\u017enostmi. Ode\u0161lete specifikace ant\u00e9nn\u00edho pohonu<\/a> s frekven\u010dn\u00edm p\u00e1smem, pr\u016fm\u011brem paraboly, typem sledov\u00e1n\u00ed (pevn\u00e9\/LEO\/n\u00e1mo\u0159n\u00ed) a n\u00e1vrhovou rychlost\u00ed v\u011btru.<\/p>\n

<\/p>\n

\n

Specifikace p\u00e1r\u016f \u0161nekov\u00fdch p\u0159evod\u016f pro polohova\u010de ant\u00e9n?<\/h3>\n

Vys\u00edlac\u00ed frekven\u010dn\u00ed p\u00e1smo, pr\u016fm\u011br paraboly, typ sledov\u00e1n\u00ed (geostacion\u00e1rn\u00ed, LEO, n\u00e1mo\u0159n\u00ed), n\u00e1vrhov\u00e1 rychlost v\u011btru a to, zda je ant\u00e9na pozemn\u00ed nebo namontovan\u00e1 na plavidle. Vypo\u010d\u00edt\u00e1me rozpo\u010det na zam\u011b\u0159en\u00ed a doporu\u010d\u00edme t\u0159\u00eddu v\u016fle, metodu p\u0159edp\u011bt\u00ed a specifikaci koroze.<\/p>\n

Vy\u017e\u00e1dejte si specifikaci ant\u00e9nn\u00edho pohonu \u2192<\/a><\/p>\n<\/div>\n

St\u0159iha\u010d: Cxm<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

Korea Ever-Power \u00b7 Application Engineering Guide Worm and Worm Wheel for Antenna Positioner and Satellite Dish Drives A Ka-band earth station with a 1.2-metre dish has a beam width of 0.6 degrees. The satellite sits 36,000 km away in geostationary orbit. If the worm gear pair driving the antenna azimuth axis has 4 arcminutes of […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[2821],"tags":[],"class_list":["post-1400","post","type-post","status-publish","format-standard","hentry","category-worm-and-worm-wheel"],"_links":{"self":[{"href":"https:\/\/worm-and-worm-wheel.com\/cs\/wp-json\/wp\/v2\/posts\/1400","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/worm-and-worm-wheel.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/worm-and-worm-wheel.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/worm-and-worm-wheel.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/worm-and-worm-wheel.com\/cs\/wp-json\/wp\/v2\/comments?post=1400"}],"version-history":[{"count":2,"href":"https:\/\/worm-and-worm-wheel.com\/cs\/wp-json\/wp\/v2\/posts\/1400\/revisions"}],"predecessor-version":[{"id":1402,"href":"https:\/\/worm-and-worm-wheel.com\/cs\/wp-json\/wp\/v2\/posts\/1400\/revisions\/1402"}],"wp:attachment":[{"href":"https:\/\/worm-and-worm-wheel.com\/cs\/wp-json\/wp\/v2\/media?parent=1400"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/worm-and-worm-wheel.com\/cs\/wp-json\/wp\/v2\/categories?post=1400"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/worm-and-worm-wheel.com\/cs\/wp-json\/wp\/v2\/tags?post=1400"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}