[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.vigan.cz\/internet-na-praze-5-se-siri-ve-dvou-frekvencnich-pasmech\/#Article","mainEntityOfPage":"https:\/\/www.vigan.cz\/internet-na-praze-5-se-siri-ve-dvou-frekvencnich-pasmech\/","headline":"Internet na Praze 5 se \u0161\u00ed\u0159\u00ed ve dvou frekven\u010dn\u00edch p\u00e1smech","name":"Internet na Praze 5 se \u0161\u00ed\u0159\u00ed ve dvou frekven\u010dn\u00edch p\u00e1smech","description":"V sou\u010dasn\u00e9 dob\u011b je b\u011b\u017en\u00fdm standardem bezdr\u00e1tov\u00fdch Wi-Fi s\u00edt\u00ed p\u0159enos dat v p\u00e1smech r\u00e1diov\u00fdch vln 2,4 GHz a 5 GHz. Obecn\u011b Wi-Fi s\u00edt\u011b vyu\u017e\u00edvaj\u00ed fyzik\u00e1ln\u00ed vlastnosti \u0161\u00ed\u0159en\u00ed r\u00e1diov\u00fdch vln pozemn\u00edmi<p><a href=\"https:\/\/www.vigan.cz\/internet-na-praze-5-se-siri-ve-dvou-frekvencnich-pasmech\/\" class=\"more-link\">P\u0159e\u010d\u00edst \u010dl\u00e1nek<span class=\"screen-reader-text\">Internet na Praze 5 se \u0161\u00ed\u0159\u00ed ve dvou frekven\u010dn\u00edch p\u00e1smech<\/span><\/a><\/p>","datePublished":"2018-06-04","dateModified":"2018-06-04","author":{"@type":"Person","@id":"https:\/\/www.vigan.cz\/author\/#Person","name":"","url":"https:\/\/www.vigan.cz\/author\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/093836c6bc976bea6a4c3cd39f9136c261430c33201aa865249fef2be34e3fdb?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/093836c6bc976bea6a4c3cd39f9136c261430c33201aa865249fef2be34e3fdb?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"vigan.cz","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.vigan.cz\/wp-content\/uploads\/img_a318411_w2077_t1529310123.png","url":"https:\/\/www.vigan.cz\/wp-content\/uploads\/img_a318411_w2077_t1529310123.png","height":0,"width":0},"url":"https:\/\/www.vigan.cz\/internet-na-praze-5-se-siri-ve-dvou-frekvencnich-pasmech\/","about":["Slu\u017eby"],"wordCount":437,"articleBody":"  V sou\u010dasn\u00e9 dob\u011b je b\u011b\u017en\u00fdm standardem bezdr\u00e1tov\u00fdch Wi-Fi s\u00edt\u00ed p\u0159enos dat v p\u00e1smech r\u00e1diov\u00fdch vln 2,4 GHz a 5 GHz. Obecn\u011b Wi-Fi s\u00edt\u011b vyu\u017e\u00edvaj\u00ed fyzik\u00e1ln\u00ed vlastnosti \u0161\u00ed\u0159en\u00ed r\u00e1diov\u00fdch vln pozemn\u00edmi zdroji, p\u0159i\u010dem\u017e tyto vlny prostupuj\u00ed skrze mechanick\u00e9 p\u0159ek\u00e1\u017eky. Jist\u011b to dob\u0159e zn\u00e1te z praxe \u2013 zapnete si r\u00e1dio a svou obl\u00edbenou stanici (pokud je v dosahu jej\u00ed vys\u00edla\u010d), m\u016f\u017eete poslouchat jak venku v p\u0159\u00edrod\u011b, tak i uvnit\u0159 domu, a t\u0159eba i ve sklep\u011b. Kolik postav\u00edte r\u00e1diov\u00e9mu sign\u00e1lu p\u0159ek\u00e1\u017eek, je v podstat\u011b jedno. Tento jednoduch\u00fd fyzik\u00e1ln\u00ed princip je v\u0161ak omezen vys\u00edlac\u00ed frekvenc\u00ed. V z\u00e1sad\u011b plat\u00ed, \u017ee \u010d\u00edm jsou r\u00e1diov\u00e9 vlny del\u0161\u00ed, t\u00edm l\u00e9pe prostupuj\u00ed skrze p\u0159ek\u00e1\u017eky. Budeme-li tedy posuzovat prostupnost bezdr\u00e1tov\u00fdch s\u00edt\u00ed postaven\u00fdch na principu Wi-Fi, je logick\u00e9, \u017ee prostupn\u011bj\u0161\u00ed jsou s\u00edt\u011b o ni\u017e\u0161\u00ed frekvenci, je to d\u00e1no t\u00edm, \u017ee vlnov\u00e1 d\u00e9lka je p\u0159\u00edmo \u00fam\u011brn\u00e1 kmito\u010dtu (frekvenci) a lze ji vypo\u010d\u00edtat podle vzorce \u03bb = c \/ f, kde \u03bb je vlnov\u00e1 d\u00e9lka, c je rychlost sv\u011btla a f je frekvence. Z v\u00fdpo\u010dtu u frekvenc\u00ed Wi-Fi s\u00edt\u00ed Internetu v Praze 5 a pochopiteln\u011b i v dal\u0161\u00edch lokalit\u00e1ch, tedy vypl\u00fdv\u00e1, \u017ee vlnov\u00e1 d\u00e9lka kmito\u010dtu 5 GHz je 6 cm a vlnov\u00e1 d\u00e9lka u s\u00edt\u00ed v p\u00e1smu 2,4 GHz je 12,5 cm.  S\u00edt\u011b 5 GHz Jejich v\u00fdhodou je stabiln\u00ed provoz v m\u00edrn\u011b ru\u0161en\u00e9m p\u00e1smu, dnes jsou tyto zdroje pom\u011brn\u011b m\u00e1lo vyu\u017e\u00edvan\u00e9 a tak je p\u0159enos dat stabiln\u00ed a rychl\u00fd. Probl\u00e9m ov\u0161em vznikne tehdy, postav\u00edme-li do cesty vys\u00edla\u010de n\u011bjakou p\u0159ek\u00e1\u017eku. V byt\u011b zkr\u00e1tka tyto s\u00edt\u011b nedosahuj\u00ed do takov\u00e9 vzd\u00e1lenosti a po\u010d\u00edt\u00e1 se doslova ka\u017ed\u00e1 ze\u010f, ka\u017ed\u00fd strom, ka\u017ed\u00fd kus n\u00e1bytku, skla atd. S\u00edt\u011b 2,4 GHz Jsou sice velmi hust\u011b obsazeny, ale jsou mnohem propustn\u011bj\u0161\u00ed. Pochopiteln\u011b do hry vstupuj\u00ed faktory dispozice bytu, lokalita, s\u00edla vys\u00edla\u010de \u2013 ten by tak\u00e9 m\u011bl b\u00fdt um\u00edst\u011bn v\u017edy v p\u0159\u00edm\u00e9m sm\u011bru ant\u00e9na \u2013 vys\u00edla\u010d. Du\u00e1ln\u00ed provoz Dnes nen\u00ed t\u0159eba se p\u0159\u00edmo spol\u00e9hat na jedin\u00e9 p\u00e1smo, lze vyu\u017e\u00edt tzv. router s du\u00e1ln\u00edm provozem. Ten vyu\u017e\u00edv\u00e1 automaticky p\u0159enos dat po rychlej\u0161\u00ed a prostupn\u011bj\u0161\u00ed s\u00edti, je tedy schopen pracovat s ob\u011bma p\u00e1smy.                                                                                                                                                                                                                                                                                                                                                                                                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