Re: Perfectly Accurate in a Scientific Sense
The act of putting information on a carrier causes it to occupy spectrum, the amount needed being directly related to how much information you're adding. So the more information, the more bandwidth. Higher frequencies only allow more bandwidth - in conventional radios - because the frequency filter used to separate channels can only work with channel spacing that's percentage of the band frequency.......so "higher frequency, higher bandwidth" is really a "trick of the light" (!).
In modern (digital) radio you may find that the spectrum used by a 'channel' may be conceptually broken up into 64 sub-channels or more, with each channel carrying digitally coded data, anything from one to 64 bits or more. The bit stream that's making this up is usually coded to suppress errors, then its framed, the frames have coding........and it goes on.........
Fascinating, if a bit heavy, stuff. Makes you pine for the days where all you needed to listen to the wireless was an antenna, a tuning coil, cat's whisker and crystal plus a pair of high impedance headphones.