difference between channels and frequencies
When we talk about the frequency of a radio or TV broadcast, that means the number of cycles per second. 1 cycle per second has the arcane definition of Hertz. The term channel is an artifact used to group a fundamental frequency and it harmonics into a single category. The numbers 2, 3, 4, ... 1000 plus are rather arbitrary TV channel numbers. But each one signifies a specifically assigned fundamental frequency and its harmonics.