Para experimentar as centenas de extras aqui disponíveis, descarregue o Mozilla Firefox, uma maneira fácil e gratuita de navegar na Web!Fechar
Bem-vindo aos extras do Firefox.
Escolha a partir de centenas de funcionalidades e estilos extra para tornar o Firefox só seu.Fechar
WIFI Finder 1.811.33.1-signed.1-signed Reinício necessário
por Henry Perez
WIFI Finder scans for WIFI Access Points around your environment to find out Name, MAC Address and Signal strength of WIFI access point.
Sobre este extra
access points as a list in toolbar button. Button is auto loaded for
Signal strength is in dBm so the lower the better it is.
Absolute power of a signal is measured in wattage. The bel or decibel
system can only describe relative power- a gain of 3 dB means your
signal is 2 times as strong as it was before, but the dB scale doesn't
define where you're starting from or what your 'zero' is. So, we
specify dBm, indicating that our scale is relative to 1 milliWatt of
power. 0 dBm = 1 mW.
The reason you see negative values is that you're representing small
but positive numbers, on a logarithmic scale. In logarithms, the value
indicated represents an exponent... for example, under a log 10 scale,
a value of -2 represents 10 to the -2 power, which equals 0.01.
Likewise, a negative dBm means that you're applying a negative
exponent in your power calculations; 0 dBm equals 1 mW of power, so
-10 dBm equates to 0.1 mW, -20 dBm equates to 0.01 mW, and so forth.
It's a lot easier, and more useful in some calculations, to describe a
weak signal as -100 dBm as opposed to 0.0000000001 mW.