{"id":3897,"date":"2023-03-30T18:37:25","date_gmt":"2023-03-30T18:37:25","guid":{"rendered":"https:\/\/csiag.eu\/?p=3897"},"modified":"2023-05-11T19:15:14","modified_gmt":"2023-05-11T19:15:14","slug":"utlum-sireni-radiovych-vln","status":"publish","type":"post","link":"https:\/\/csiag.eu\/cs\/blog\/2023\/03\/30\/ausbreitung-daempfung-von-funkwellen\/","title":{"rendered":"\u0160\u00ed\u0159en\u00ed a \u00fatlum r\u00e1diov\u00fdch vln"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Obsah<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/csiag.eu\/cs\/blog\/2023\/03\/30\/ausbreitung-daempfung-von-funkwellen\/#Historie\" >Historie<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/csiag.eu\/cs\/blog\/2023\/03\/30\/ausbreitung-daempfung-von-funkwellen\/#Ausbreitung\" >Spread<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/csiag.eu\/cs\/blog\/2023\/03\/30\/ausbreitung-daempfung-von-funkwellen\/#Dampfung\" >Tlumen\u00ed<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/csiag.eu\/cs\/blog\/2023\/03\/30\/ausbreitung-daempfung-von-funkwellen\/#Kabel-_Verbinder-_Dampfungsverluste\" >Ztr\u00e1ty na kabelu \/ konektoru \/ \u00fatlumu<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/csiag.eu\/cs\/blog\/2023\/03\/30\/ausbreitung-daempfung-von-funkwellen\/#WLAN_Richtfunkstrecke\" >WLAN \/ radiorel\u00e9ov\u00fd spoj<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/csiag.eu\/cs\/blog\/2023\/03\/30\/ausbreitung-daempfung-von-funkwellen\/#Funkfeldstarke\" >Intenzita r\u00e1diov\u00e9ho pole<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/csiag.eu\/cs\/blog\/2023\/03\/30\/ausbreitung-daempfung-von-funkwellen\/#Schutzmasnahmen\" >Ochrann\u00e1 opat\u0159en\u00ed<\/a><\/li><\/ul><\/nav><\/div>\n<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Doba \u010dten\u00ed<\/span> <span class=\"rt-time\"> 3<\/span> <span class=\"rt-label rt-postfix\">minuty<\/span><\/span>\n<p>T\u00e9ma WLAN, vystaven\u00ed z\u00e1\u0159en\u00ed a st\u00edn\u011bn\u00ed se objevuje st\u00e1le znovu. Pochopen\u00ed \u0161\u00ed\u0159en\u00ed a \u00fatlumu r\u00e1diov\u00fdch vln pom\u00e1h\u00e1 tak\u00e9 p\u0159i pr\u00e1ci s r\u00e1diovou technologi\u00ed. Z tohoto d\u016fvodu jsou n\u00ed\u017ee uvedeny podrobn\u011bj\u0161\u00ed informace, a\u010dkoli to nejprve vy\u017eaduje z\u00e1kladn\u00ed znalosti. Tak\u017ee na za\u010d\u00e1tek trochu such\u00e9 teorie.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Historie\"><\/span>Historie<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>V roce 1886 Heinrich Hertz, po n\u011bm\u017e byla pojmenov\u00e1na jednotka pro m\u011b\u0159en\u00ed frekvence (Hz), jako prvn\u00ed experiment\u00e1ln\u011b prok\u00e1zal existenci elektromagnetick\u00fdch (r\u00e1diov\u00fdch) vln, kter\u00e9 teoreticky p\u0159edpov\u011bd\u011bl James Clerk Maxwell v roce 1867.<\/p>\n\n\n\n<p>Nikola Tesla obdr\u017eel sv\u016fj prvn\u00ed patent na bezdr\u00e1tov\u00fd p\u0159enos energie, r\u00e1diovou technologii, 20. b\u0159ezna 1900.<\/p>\n\n\n\n<p>Braun a Marconi jsou dal\u0161\u00ed jm\u00e9na spojen\u00e1 s rozvojem telegrafie, kter\u00e1 pomoc\u00ed elektromagnetick\u00e9ho telegrafu a Morseovy abecedy vynalezen\u00e9 Samuelem Finleyem Breesem Morseem ji\u017e v roce 1837 umo\u017e\u0148ovala p\u0159ed\u00e1vat zpr\u00e1vy na vzd\u00e1lenost a\u017e 3 600 kilometr\u016f.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ausbreitung\"><\/span>Spread<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u0160\u00ed\u0159en\u00ed elektromagnetick\u00fdch vln z\u00e1vis\u00ed na frekvenci, topologick\u00fdch a atmosf\u00e9rick\u00fdch podm\u00ednk\u00e1ch.<\/p>\n\n\n\n<p>Vrstvy ionosf\u00e9ry (pr\u016fm\u011brn\u00e1 v\u00fd\u0161ka cca 1 000 km), kter\u00e9 navazuj\u00ed na troposf\u00e9ru (v\u00fd\u0161ka 17 .. 17 km) a stratosf\u00e9ru (v\u00fd\u0161ka 8 .. 50 km) v bl\u00edzkosti Zem\u011b, mohou odr\u00e1\u017eet elektromagnetick\u00e9 vlny d\u00edky stupni ionizace, kter\u00fd z\u00e1vis\u00ed na slune\u010dn\u00ed aktivit\u011b. V extr\u00e9mn\u00edch p\u0159\u00edpadech m\u016f\u017ee b\u00fdt pr\u00e1v\u011b vyslan\u00fd sign\u00e1l znovu p\u0159ijat na stejn\u00e9m m\u00edst\u011b opakovan\u00fdm odrazem kolem zem\u011bkoule (obvod cca 40 000 km), zpo\u017ed\u011bn\u00fdm o dobu pr\u016fchodu (300 000 km\/s).<\/p>\n\n\n\n<p>Nad frekvenc\u00ed p\u0159ibli\u017en\u011b 60 MHz se r\u00e1diov\u00e9 vlny \u0161\u00ed\u0159\u00ed jako sv\u011btlo. Mohou se odr\u00e1\u017eet od p\u0159ek\u00e1\u017eek. Zejm\u00e9na nad 100 MHz jsou r\u00e1diov\u00e9 vlny p\u0159i sv\u00e9m \u0161\u00ed\u0159en\u00ed st\u00e1le v\u00edce ru\u0161eny odrazy. V nejnep\u0159\u00edzniv\u011bj\u0161\u00edm p\u0159\u00edpad\u011b se mohou vlnov\u00e9 h\u0159ebeny a koryta vz\u00e1jemn\u011b vyru\u0161it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"D\u00e4mpfung\"><span class=\"ez-toc-section\" id=\"Dampfung\"><\/span>Tlumen\u00ed<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u00datlum je zeslaben\u00ed sign\u00e1lu. \u00datlum se m\u011b\u0159\u00ed v decibelech (dB) nebo decibelech v miliwattech (dBm) nebo pro vy\u0161\u0161\u00ed \u00farovn\u011b v\u00fdkonu v decibelech ve wattech (dBW) v logaritmick\u00e9m tvaru, aby bylo mo\u017en\u00e9 prakticky zobrazit vy\u0161\u0161\u00ed \u00farovn\u011b.<\/p>\n\n\n\n<p>Je d\u016fle\u017eit\u00e9 rozli\u0161ovat mezi hodnotami \u00fatlumu v procentech a v dB, v p\u0159\u00edpad\u011b zvuku db(A) znamen\u00e1 \"A\" p\u0159izp\u016fsoben\u00ed k\u0159ivce lidsk\u00e9ho sluchu (s ohledem na skute\u010dnost, \u017ee vysok\u00e9 a n\u00edzk\u00e9 zvuky jsou p\u0159i stejn\u00e9 hlasitosti vn\u00edm\u00e1ny odli\u0161n\u011b).<\/p>\n\n\n\n<p>Decibel obvykle ozna\u010duje hodnotu zes\u00edlen\u00ed, tj. je kladn\u00fd. Z\u00e1porn\u00e9 znam\u00e9nko tedy popisuje \u00fatlum.<br>100 dB znamen\u00e1 100 000n\u00e1sobek akustick\u00e9ho tlaku 0 dB nebo akustick\u00fd tlak 2 pa (Pascal).<\/p>\n\n\n\n<table id=\"tablepress-2\" class=\"tablepress tablepress-id-2\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">Hluk<\/th><th class=\"column-2\">db(A)<\/th><th class=\"column-3\">St\u00edn\u011bn\u00ed (dB)<\/th><th class=\"column-4\">%<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">Kotou\u010dov\u00e1 pila<\/td><td class=\"column-2\">90<\/td><td class=\"column-3\">10<\/td><td class=\"column-4\">90<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">Dny na d\u00e1lnici<\/td><td class=\"column-2\">80<\/td><td class=\"column-3\">20<\/td><td class=\"column-4\">99<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">Hlavn\u00ed ulice b\u011bhem dne<\/td><td class=\"column-2\">70<\/td><td class=\"column-3\">30<\/td><td class=\"column-4\">99,9<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">Hlavn\u00ed silnice v noci<\/td><td class=\"column-2\">60<\/td><td class=\"column-3\">40<\/td><td class=\"column-4\">99,99<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">Bo\u010dn\u00ed ulice b\u011bhem dne<\/td><td class=\"column-2\">50<\/td><td class=\"column-3\">50<\/td><td class=\"column-4\">99,999<\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">Vedlej\u0161\u00ed silnice v noci<\/td><td class=\"column-2\">40<\/td><td class=\"column-3\">60<\/td><td class=\"column-4\">99,999.9<\/td>\n<\/tr>\n<tr class=\"row-8\">\n\t<td class=\"column-1\">V\u00fd\u0161ivka hodin<\/td><td class=\"column-2\">30<\/td><td class=\"column-3\">70<\/td><td class=\"column-4\">99,999.99<\/td>\n<\/tr>\n<tr class=\"row-9\">\n\t<td class=\"column-1\">Hluk list\u016f<\/td><td class=\"column-2\">20<\/td><td class=\"column-3\">80<\/td><td class=\"column-4\">99,999.999<\/td>\n<\/tr>\n<tr class=\"row-10\">\n\t<td class=\"column-1\">Zvuk d\u00fdch\u00e1n\u00ed<\/td><td class=\"column-2\">10<\/td><td class=\"column-3\">90<\/td><td class=\"column-4\">99,999.999.9<\/td>\n<\/tr>\n<tr class=\"row-11\">\n\t<td class=\"column-1\">Ticho<\/td><td class=\"column-2\">0<\/td><td class=\"column-3\">100<\/td><td class=\"column-4\">99,999.999.99<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p>Pro p\u0159edstavu, jak vysok\u00e1 je \u00fatlumov\u00e1 schopnost materi\u00e1lu, kter\u00fdm pronikaj\u00ed r\u00e1diov\u00e9 vlny, se porovn\u00e1v\u00e1 strop budovy o tlou\u0161\u0165ce &lt;30 cm (70%) s dr\u00e1t\u011bn\u00fdm pletivem o tlou\u0161\u0165ce men\u0161\u00ed ne\u017e 1 mm (100%) nebo s\u00e1drokartonovou p\u0159\u00ed\u010dkou o tlou\u0161\u0165ce men\u0161\u00ed ne\u017e 10 cm (10%).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Kabel-_Verbinder-_Dampfungsverluste\"><\/span>Ztr\u00e1ty na kabelu \/ konektoru \/ \u00fatlumu<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Pokud r\u00e1diov\u00e9 vlny proch\u00e1zej\u00ed kabely, z\u00e1str\u010dkami, spojkami atd., nap\u0159. na cest\u011b od r\u00e1dia k ant\u00e9n\u011b, doch\u00e1z\u00ed i zde k \u00fatlumov\u00fdm ztr\u00e1t\u00e1m. Typ a d\u00e9lka pou\u017eit\u00e9ho ant\u00e9nn\u00edho kabelu, stejn\u011b jako z\u00e1str\u010dkov\u00e9 spoje, ur\u010duj\u00ed velikost celkov\u00fdch \u00fatlumov\u00fdch ztr\u00e1t.<\/p>\n\n\n\n<p>Obecn\u011b plat\u00ed, \u017ee sou\u010det \u00fatlumov\u00fdch ztr\u00e1t nesm\u00ed p\u0159ekro\u010dit zisk ant\u00e9ny. Podle toho je t\u0159eba volit jednotliv\u00e9 komponenty.<\/p>\n\n\n\n<p>P\u0159i v\u00fdb\u011bru ant\u00e9nn\u00edho kabelu je t\u0159eba vz\u00edt v \u00favahu tak\u00e9 typ kabelu, a\u0165 u\u017e jde o lanko nebo pevn\u00fd vodi\u010d, st\u00edn\u011bn\u00ed, konstrukci pl\u00e1\u0161t\u011b, d\u00e9lku a frekvenci, kter\u00e1 se m\u00e1 pou\u017e\u00edt. Rozhoduj\u00edc\u00ed je tak\u00e9 konstruk\u010dn\u00ed pou\u017eit\u00ed: halogenov\u00e9 kabely jsou \u017e\u00e1ruvzdorn\u00e9 a neho\u0159lav\u00e9, kabely s dr\u00e1\u017ekami se pou\u017e\u00edvaj\u00ed pro instalaci v tunelech.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"WLAN_Richtfunkstrecke\"><\/span>WLAN \/ radiorel\u00e9ov\u00fd spoj<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Pro WLAN jsou k dispozici frekvence 2,4 GHz, 5 a 6 GHz a 24 a 60 GHz. Pokud chcete dos\u00e1hnout velk\u00e9ho dosahu p\u0159es zdi a stropy, zvolte nejni\u017e\u0161\u00ed frekvence, tj. 2,4 GHz. Maj\u00ed dosah v r\u00e1mci rodinn\u00e9ho domu. V p\u0159\u00edpad\u011b dvojdomk\u016f m\u011bjte na pam\u011bti, \u017ee je dostate\u010dn\u00fd i pro sousedy. Pokud chcete vysok\u00e9 p\u0159enosov\u00e9 rychlosti na kr\u00e1tkou vzd\u00e1lenost, pou\u017eijte frekvenci 5 GHz, proto\u017ee sotva pronikne podlahou nebo stropem. Tot\u00e9\u017e plat\u00ed pro p\u00e1smo 6 GHz.<br>Naproti tomu frekvence 24 a 60 GHz umo\u017e\u0148uj\u00ed vzd\u00e1lenost 200 ... 1.000 m. Podm\u00ednkou je zde p\u0159\u00edm\u00e1 viditelnost. D\u00e9\u0161\u0165, mlha, sn\u011b\u017een\u00ed atd. mohou v\u00e9st ke ztr\u00e1t\u00e1m v propustnosti, kter\u00e9 lze \u010d\u00e1ste\u010dn\u011b kompenzovat technick\u00fdmi opat\u0159en\u00edmi.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Funkfeldstarke\"><\/span>Intenzita r\u00e1diov\u00e9ho pole<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Intenzita r\u00e1diov\u00e9ho pole elektrick\u00fdch za\u0159\u00edzen\u00ed je 1 ... 2 mW, r\u00e1diov\u00fd spoj asi 10 mW, WLAN na 2,4 GHz 100 mW, na 5 GHz 200 mW, mikrovlnn\u00e1 trouba 800 mW a mobiln\u00ed telefon 2 000 mW.<\/p>\n\n\n\n<p>Obecn\u011b plat\u00ed, \u017ee pro vysokofrekven\u010dn\u00ed elektromagnetick\u00e1 pole plat\u00ed mezn\u00ed hodnoty, kter\u00e9 popisuj\u00ed takzvanou specifickou m\u00edru absorpce (SAR), jej\u00ed\u017e spot\u0159eba energie lidskou tk\u00e1n\u00ed je p\u0159ijateln\u00e1.<\/p>\n\n\n\n<p>V pr\u016fm\u011bru na cel\u00e9 lidsk\u00e9 t\u011blo se uv\u00e1d\u00ed 0,08 W\/kg, v souvislosti s jednotliv\u00fdmi oblastmi, nap\u0159. hlava (mobiln\u00ed telefon) 2 W\/kg.<\/p>\n\n\n\n<p>Mobiln\u00ed telefon na uchu ji\u017e vystavuje organismus maxim\u00e1ln\u00ed p\u0159\u00edpustn\u00e9 z\u00e1t\u011b\u017ei.<\/p>\n\n\n\n<p>U citliv\u00fdch osob mohou \u00fa\u010dinky elektromagnetick\u00e9ho z\u00e1\u0159en\u00ed zahrnovat poruchy regulace krevn\u00edho tlaku, deprese, hormon\u00e1ln\u00ed poruchy, potla\u010den\u00ed imunity, poruchy koncentrace, bolesti hlavy, \u00fanavu, poruchy sp\u00e1nku, z\u00e1vrat\u011b, nevolnost a neklid.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Schutzmasnahmen\"><\/span>Ochrann\u00e1 opat\u0159en\u00ed<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Um\u00edst\u011bn\u00ed sm\u011brova\u010de WLAN zvolte co nejd\u00e1le od pracovi\u0161t\u011b.<\/li>\n\n\n\n<li>Vyu\u017eijte frekven\u010dn\u00ed p\u00e1smo podle aktu\u00e1ln\u00edch po\u017eadavk\u016f.<\/li>\n\n\n\n<li>Deaktivujte s\u00ed\u0165 WLAN, pokud ji nepou\u017e\u00edv\u00e1te. <\/li>\n<\/ol>\n\n\n\n<p>Pokud se chcete chr\u00e1nit p\u0159ed vn\u011bj\u0161\u00edm elektromagnetick\u00fdm z\u00e1\u0159en\u00edm, m\u016f\u017eete si sv\u016fj domov navrhnout jako Faradayovu klec. V takov\u00e9m p\u0159\u00edpad\u011b se pod oblo\u017een\u00ed st\u011bn\/ tapety nebo speci\u00e1ln\u00ed EMC tapety s kovovou zadn\u00ed stranou um\u00edst\u00ed pl\u00e1ty tenk\u00e9ho kovov\u00e9ho pletiva, m\u011bd\u011bn\u00e9 f\u00f3lie nebo v p\u0159\u00edpad\u011b pot\u0159eby hlin\u00edkov\u00e9 f\u00f3lie. Je d\u016fle\u017eit\u00e9, aby ka\u017ed\u00fd list m\u011bl elektrick\u00fd kontakt se sousedn\u00edm listem, aby okenn\u00ed tabule byly tak\u00e9 pokoven\u00e9 a aby tato vrstva byla tak\u00e9 spojena se st\u00edn\u011bn\u00edm st\u011bn.<br>Cel\u00e1 instalace mus\u00ed b\u00fdt p\u0159ipojena k syst\u00e9mu vyrovn\u00e1n\u00ed potenci\u00e1lu budovy, aby bylo zaji\u0161t\u011bno \u0159\u00e1dn\u00e9 uzemn\u011bn\u00ed.<\/p>\n\n\n\n<p>T\u00edmto zp\u016fsobem je tato m\u00edstnost chr\u00e1n\u011bna p\u0159ed \u00fa\u010dinky vn\u011bj\u0161\u00edch elektromagnetick\u00fdch vliv\u016f; naopak r\u00e1diov\u00fd provoz sm\u011brova\u010de WLAN v t\u00e9to m\u00edstnosti by byl chr\u00e1n\u011bn p\u0159ed vn\u011bj\u0161\u00edmi odposlechy.<\/p>\n\n\n\n<p>T\u00e9ma elektrosmogu a st\u00ednic\u00ed techniky je diskutov\u00e1no v tomto \u010dl\u00e1nku. <a href=\"https:\/\/csiag.eu\/cs\/elektrosmog\/\" data-type=\"post\" data-id=\"4186\" target=\"_blank\" rel=\"noreferrer noopener\">P\u0159\u00edsp\u011bvek<\/a> zpracov\u00e1v\u00e1ny odd\u011blen\u011b.<\/p>\n\n\n\n<p class=\"has-text-color\" style=\"color:#fe0000\">Ve\u0161ker\u00e9 pr\u00e1ce na elektrick\u00fdch syst\u00e9mech sm\u00ed prov\u00e1d\u011bt pouze kvalifikovan\u00fd person\u00e1l!<\/p>","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Doba \u010dten\u00ed<\/span> <span class=\"rt-time\"> 3<\/span> <span class=\"rt-label rt-postfix\">minuty<\/span><\/span>T\u00e9ma WLAN, vystaven\u00ed z\u00e1\u0159en\u00ed a st\u00edn\u011bn\u00ed se objevuje st\u00e1le znovu. Pochopen\u00ed \u0161\u00ed\u0159en\u00ed a \u00fatlumu r\u00e1diov\u00fdch vln pom\u00e1h\u00e1 tak\u00e9 p\u0159i pr\u00e1ci s r\u00e1diovou technologi\u00ed. Z tohoto d\u016fvodu jsou n\u00ed\u017ee uvedeny podrobn\u011bj\u0161\u00ed informace, a\u010dkoli to nejprve vy\u017eaduje z\u00e1kladn\u00ed znalosti. Tak\u017ee na za\u010d\u00e1tek trochu such\u00e9 teorie. Historie Heinrich Hertz, podle jednotky pro m\u011b\u0159en\u00ed frekvence (Hz)...&nbsp;<a href=\"https:\/\/csiag.eu\/cs\/blog\/2023\/03\/30\/ausbreitung-daempfung-von-funkwellen\/\" rel=\"bookmark\">\u010c\u00edst d\u00e1le \"<span class=\"screen-reader-text\">\u0160\u00ed\u0159en\u00ed a \u00fatlum r\u00e1diov\u00fdch vln<\/span><\/a><\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[359,1302,345,358,357],"tags":[566,1326,1304,1340,1312,1305,1325,1319,1331,1341,1318,1323,1333,1349,1350,557,1336,1324,1307,1306,1335,1328,1310,1342,1317,1343,1344,1322,1313,1311,1351,1338,1337,1309,1345,1352,514,1330,1339,1327,1346,1329,1334,1347,1332,1320,1303,1316,1314,1308,1315,1101,1348,1321,563],"class_list":["post-3897","post","type-post","status-publish","format-standard","hentry","category-cb-funk-im-wohnmobil","category-funktechnik","category-kommunikation-lte","category-verbindung-zu-wlan-access-points","category-wlan-richtfunk-technik","tag-antenne","tag-antennengewinn","tag-ausbreitung","tag-blutdruckdysregulation","tag-braun","tag-daempfung","tag-daempfungsverluste","tag-daempfungsvermoegen","tag-datenraten","tag-depressionen","tag-dezibel","tag-drahtgewebe","tag-dunst","tag-faraday","tag-faradayscher-kaefig","tag-frequenz","tag-funkfeldstaerke","tag-funkgeraet","tag-funktechnik","tag-funkwellen","tag-grenzwerte","tag-halogenkabel","tag-hertz","tag-immunsupression","tag-ionosphaere","tag-konzentrationsstoerungen","tag-kopfschmerzen","tag-kupplung","tag-marconi","tag-maxwell","tag-metallbedampft","tag-mikrowelle","tag-mobiltelefons","tag-morse","tag-muedigkeit","tag-potenzialausgleich","tag-regen","tag-richtfunkstrecken","tag-sar","tag-schirmung","tag-schlafstoerungen","tag-schlitzkabel","tag-schneefall","tag-schwindel","tag-sichtverbindung","tag-stecker","tag-strahlungsbelastung","tag-stratosphaere","tag-telegrafen","tag-telegrafie","tag-troposphaere","tag-uebelkeit","tag-unruhe","tag-verbinder","tag-wlan"],"modified_by":"Achim Goerner","_links":{"self":[{"href":"https:\/\/csiag.eu\/cs\/wp-json\/wp\/v2\/posts\/3897","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/csiag.eu\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/csiag.eu\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/csiag.eu\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/csiag.eu\/cs\/wp-json\/wp\/v2\/comments?post=3897"}],"version-history":[{"count":0,"href":"https:\/\/csiag.eu\/cs\/wp-json\/wp\/v2\/posts\/3897\/revisions"}],"wp:attachment":[{"href":"https:\/\/csiag.eu\/cs\/wp-json\/wp\/v2\/media?parent=3897"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/csiag.eu\/cs\/wp-json\/wp\/v2\/categories?post=3897"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/csiag.eu\/cs\/wp-json\/wp\/v2\/tags?post=3897"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}