Also why can't channels be KHz wide? Modern technology still doesn't have a fine enough resolution? Furthermore, why were channels selected to be specifically 22MHz wide? What advantage does this offer?
I"For receiving, the WispStation M5 has -97 dB sensitivity at 1-24 Mbps with a tolerance of +/-2dB."I see this statistic in each datasheet, but I'm confused because db in the log of a ratio. So what does it mean to have -97 dB sensitivity? What is the implication..
How can short wave be used for great distances? Lower frequency = higher distances... right? But here higher frequency is higher distance.
As I understand it btw, under one channel you can only send one stream of data? Channel is the resolution or width for detecting bits. Sort of like, 0V and 5V. If that makes any sense...
Assume you have a transmitter in an environment free of interference and you measure the output power as 1mw at the transmitter output. 1mw = 0dbm. You send that mw into a x10 high gain antenna and measure the radiated output as 100mw. 100mw = 20dbm.
When we look at the radio receiver, the transmitter power is of little interest. What is of of interest is the sensitivity, in other words the capability of the receiver to distinguish and demodulate an attenuated signal. As 0dbm = 1mw. -97dbm will be somewhere between 1pw and 0.1pw.
You are thinking way too simple. Wi-Fi transmission is pretty sophisticated stuff. 802.11g uses Direct Sequence Spread Spectrum transmission, with Orthogonal Frequency Division Multiplexing and I won't pretend to know exactly what OFDM over DSSS means. I have no more than a loose grasp but enough to know you have to think in 3 dimensions, rather than the 2 dimensions of a wired digital transmission.