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Post subject: ako zistit utlm kabla
Posted: 06.12.2005 - 00:10 #26089
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Basic
Joined: Mar 03, 2004
Posts: 39
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existuje nejaky sposob ako v nie-laboratornych podmienkach zmerat utlm kabla pre pripojenie 2.4ghz anteny? k dispozicii mam zopar meracich pristrojov (labak elektrotechnickej strednej skoly) takze by som potreboval len nejaky ten postup. dik |
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Post subject: RE: ako zistit utlm kabla
Posted: 06.12.2005 - 00:32 #26091
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Majster
Joined: Jan 12, 2003
Posts: 4250
Location: /dev/null
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mozes to spravit komparativnym sposobom - odmeras neake zapojenie vysielac - pigtaily - prijmac (na prijmaci musis vediet citat dBm a nie neake % a podobne bludy), potom do toho zapojis merany kabel a rozdiel o kolko ti klesne signal je utlm kabla (a vsetkeho co si do toho pridal) |
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Post subject: RE: ako zistit utlm kabla
Posted: 06.12.2005 - 12:09 #26103
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Basic
Joined: Mar 03, 2004
Posts: 39
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no tak tento sposob som zrovna nemyslel, a taktiez nemam generator 2.4ghz frekvencie takze to asi inak ako porovnavacou metodou nezmeram, bedlak ![Smile](modules/PNphpBB2/images/smiles/icon_smile.gif) |
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Post subject: RE: ako zistit utlm kabla
Posted: 06.12.2005 - 13:18 #26107
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Guru
Joined: Júl 14, 2005
Posts: 1591
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na co ti je utlm na 2.4ghz?
nepoviem 5-6Ghz ale na 2.4 mozes tahat 100 metrov koaxu a stale to pekne pojde s klasickou 24kou antenou... |
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Post subject: RE: ako zistit utlm kabla
Posted: 06.12.2005 - 13:42 #26108
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Majster
Joined: Jan 12, 2003
Posts: 4250
Location: /dev/null
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kotol: aby si sa niekedy nedivil, aku paseku dokaze narobit kabel...
Gouranga: vysielac = neake AP, prijmac = nezky HW ktory ti vie povedat ako silny signal od AP dostavas; medzi tymito zariadeniami si spravis kablovu trasu z antenneho vystupu jedneho k druhemu (pripadne tam mozes vlozit aj anteny, len cim viacej prvkov, tym vacsie skreslenie mozes ziskat) tak, aby si to vedel rozpojit a zapojit do toho merany kabel (s koncovkami). rozdiel hodnoty signalu pred vlozenim kabla a po vlozeni ti povie priblizny utlm kabla. polopatistickejsie to uz povedat neviem... signaly pri zapojeni priamo kablom medzi radiami mozes cakat aj v kladnych hodnotach dBm !!! |
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Post subject: RE: ako zistit utlm kabla
Posted: 06.12.2005 - 16:19 #26112
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Basic
Joined: Mar 03, 2004
Posts: 39
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chapem co je porovnavacia metoda aj viem presne ako to myslis ale nemam technicke moznosti ![Wink](modules/PNphpBB2/images/smiles/icon_wink.gif) |
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Post subject: RE: ako zistit utlm kabla
Posted: 06.12.2005 - 22:01 #26134
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Majster
Joined: Jan 12, 2003
Posts: 4250
Location: /dev/null
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tak pokial nemas jedno AP, jednu meraciu kartu a neake pigtaily, tak potom uz naozaj neviem... ![Smile](modules/PNphpBB2/images/smiles/icon_smile.gif) |
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Post subject: RE: ako zistit utlm kabla
Posted: 06.12.2005 - 22:21 #26135
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Basic
![](./images/avatar/cunt.gif)
Joined: Sep 22, 2005
Posts: 71
Location: Europa
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Na vacsine kablov je to napisane alebo to najdes na stranke vyrobcu.
Preco ta zaujimaju take kraviny? Slahni tam RG213/RG214/H1000/H155/RF240/RF400 a mas pokoj....kabel od zelhicky alebo satelitu neni moc dobry.... ![Mr. Green](modules/PNphpBB2/images/smiles/icon_mrgreen.gif) |
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Post subject: RE: ako zistit utlm kabla
Posted: 06.12.2005 - 22:42 #26136
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Basic
Joined: Mar 03, 2004
Posts: 39
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zaujima ma to preto lebo mam robeny kabel a chcem zistit aky vplyv na utlm ma nakrimpovanie kombinackami a podobne veci. |
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Post subject: RE: ako zistit utlm kabla
Posted: 06.12.2005 - 23:09 #26138
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Basic
Joined: Jún 02, 2003
Posts: 167
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Gouranga wrote: ›zaujima ma to preto lebo mam robeny kabel a chcem zistit aky vplyv na utlm ma nakrimpovanie kombinackami a podobne veci.
Ked nemas ani generator a voltmeter (osciloskop) pre take frekvencie, tak zabudni, ze nieco odmerias. Pokial mas u rovno nakrimpovany kabel bez oznacenia, tak mozes iba hadat co to je a porovnavat s katalogom. |
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