Re:Cave-Link: Underground text communication system
by colechristensen on Wednesday November 10, 2021 @10:12AM
(#29175417)
Bandwidth, literally the width of the band. Don’t think of it as transmitting at one frequency but a range between two, a band.
Information rate depends on the width of the band. For example wifi uses 20, 40, or 80 MHz bands. Easy when your signal is around 2.4 or 5 GHz.
But you can’t do that at 100 Hz or 100 kHz or 100 MHz because… well the numbers aren’t big enough. You could have a funny radio that transmitted from 1 to 80 MHz, but you wouldn’t say your signal was “at” 100kHz.
Information rate depends on the width of the band. For example wifi uses 20, 40, or 80 MHz bands. Easy when your signal is around 2.4 or 5 GHz.
But you can’t do that at 100 Hz or 100 kHz or 100 MHz because… well the numbers aren’t big enough. You could have a funny radio that transmitted from 1 to 80 MHz, but you wouldn’t say your signal was “at” 100kHz.
That make sense?