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The time now is 27.04.2024 - 20:38

SKFREE Forum Index » Technika » Anteny a bizuteria

Dodavana antenka ku wifi zariadeniam

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majklxxx
Post subject: RE: Dodavana antenka ku wifi zariadeniam  PostPosted: 03.04.2006 - 00:15 #33304
Basic


Joined: Mar 30, 2006
Posts: 417
Location: C:\WINNT>
JohnSK wrote: ›
neviem ake pouzivas AP.. ale noise -100dB je super. V Ziline na zaciatku bol noise okolo -98dB, potom to islo dole vodou aj na hodnoty -80dB Sad

A co sa tyka sily signalu, zalezi od citlivosti AP/karty. Napr LinkSys WRT54G este ide pri -93dB na 1mbit (SNR=100-93=7dB), pri cca -70 dB (SNR=100-70=30dB) uz ide na 54mbit. Samozrejme ak pri signale -93dB je sum -90dB tak to nepojde vobec.

A ten pelendrek -- skus ho strcit napr. do obalu z Pringles a nasmerovat na kamosa.Samozrejme kupovana antena je ovela lepsie riesenie, najma aby si nerusil ostatnych.


no ja myslim ze to Noise mi karta nemera, pretoze ako som spominal vzdy je tam -100 ..... este mi treba pohladat co to je SNR Smile
 
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Robert
Post subject: RE: Dodavana antenka ku wifi zariadeniam  PostPosted: 03.04.2006 - 00:42 #33309
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Joined: Okt 19, 2003
Posts: 2339
Location: Bratislava
SNR je signal to noise ratio. Vyjadrene v dB rozdiel medzi signalom a sumom. Pokial mas tento udaj, noise nepotrebujes. Pre spravnu funkciu je SNR dolezitejsie ako nosie v absolutnom vyjadreni.
 
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majklxxx
Post subject: RE: Dodavana antenka ku wifi zariadeniam  PostPosted: 03.04.2006 - 09:40 #33320
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Joined: Mar 30, 2006
Posts: 417
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Robert wrote: ›SNR je signal to noise ratio. Vyjadrene v dB rozdiel medzi signalom a sumom. Pokial mas tento udaj, noise nepotrebujes. Pre spravnu funkciu je SNR dolezitejsie ako nosie v absolutnom vyjadreni.


no SNR mi ukazuje NetStumbler priblizne 15dB ... nie je to nejak malo ?
 
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rafa
Post subject: RE: Dodavana antenka ku wifi zariadeniam  PostPosted: 03.04.2006 - 10:33 #33322
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Joined: Dec 01, 2004
Posts: 214
Location: Bratislava
15dB je dost malo, niektore radia chodia az od 20dB pre nizku citlivost.
Ak mas signal 60 a SNR 15, to znamena ze sum mas 75 co su hrozne podmienky...
 
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fleg
Post subject: RE: Dodavana antenka ku wifi zariadeniam  PostPosted: 03.04.2006 - 10:51 #33324
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Joined: Feb 05, 2003
Posts: 2686
Location: Topolcany
ku kazdemu wifi zariadeniu je datasheet kde si mozes pozriet aky silny signal potrebuje na konkretnu rychlost. snr 15 je podla mna uplne v pohode a ked este das klientovi natvrdo 2Mb (co ja bezne robim) tak nie je problem
 
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