jinymi slovy - jednoduchy vzorec typu "kdyz mam antenu X db, tak si muzu dovolit nastavit txpower Y" asi neexistuje, ze ne ? neslo by to rict aspon orientacne, dle zkusnosti - treba jaky je EIRP u vsesmerove anteny 8 dBi, kdyz se hodnota txpower nastavi tolik a tolik ?
mozna by stalo za to udelat neco jako merici tym czFree, ktery by by byl schopen premerovat spoje, a jejich provozovatele uklidnovat, pripadne znervoznovat, podle toho jestli jejich spoj je v norme nebo neni ?
nebo aspon presny navod, jak to zjistit z toho, co pise Netstumbler.
my ted v Brevnove nemame navic na mereni notebook... docasne...
A tim merenim to je problem. Jak zjistit vztah mezi cisly a skutecnym vykonem ...
Navic, uz slysim treti cislo pro spodni hranici txpower vedle -47 a -43. Jak se to prevadi na hodnoty registru se asi lisi podle verze wireless extensions, hostap, atd, nekdo naznacoval ...
Zde cituji mimochodem z autorova mailu:
> Setting TX power is somewhat experimental code in the driver. Currently,
> it just maps certain range (-47 .. 20 dBm, if I remember correctly) to
> baseband processor configuration register. Anything below -47 dBm will
> be handled just like -47 dBm, and similarily anything above 20 dBm is
> equal to 20 dBm. This values are configured using dBm, but they are not
> real values for most cards. 20 dBm is mapped to the highest value and
> -47 dBm to lowest. You would need to experiment with different values
> and measure the TX power with an external device, if you would like to
> get some real world values for that.
>
> --
> Jouni Malinen
Jo, spektrak mi byl taky doporucen, tak jsem se zeptal, jestli se da nekde koupit v samosce asi tak za $1. Dostalo se mi tehle odpovedi:
> Yep, it's expensive (around $3k). We have Locust from BVS. However I heard
> that you can make a cheap one using Symbol wireless cards. Symbol has a
> DOS application for download from their website. Of course it's not really
> accurate as the cards are not calibrated, but it's better than nothing.
Ahoj,
nemate nekdo zkusenost s regulaci pod Win?
(omlouvam se, pod HostAP to celkem funguje a nevim, kde se lip zeptat...)
Mam PRISM TEST UTILITIES ver 3.0.22, vidim registry, CR58 mi nekolisa (tedy vypnute ALC snad) a v CR31 mam DA nebo D9.
Bojim se, abych kartu (PCMCIA) neodpravil atd...
Jinak - pro DEU - mam moznost spektraku, museli bychom tam ale zajet (Praha4), tak kdyby byl zajem.
21.12.2002 v 11:30
regulace pres PRISM UTILS ve win?
