Any repetitive or cyclic behaviour can be represented by a cycle. The number of cycles completed in one second is called the frequency.
Radio waves travel at the speed of light in a vacuum. If an R.F. current has a frequency of 780,000 cycles per second, the wave will go through one complete cycle in 1/780,000 second. In that same period of time the wave will move 299,792,458/780,000 = 384.349 metres. By the time the wave has moved that distance the next cycle has begun and a new wave has started its journey. The first wave, representing one cycle, covers a distance of 384.349 metres before the beginning of the next. This distance is the wavelength.
The formula for calculating the frequency from the wavelength is:
The formula for calculating the wavelength from the frequency is:
F = Frequency in Cycles per second (C.P.S.) or Hertz (Hz)
c = 299,792,458 = Speed of light in metres per second
λ = Wavelength in metres