• Fluctuations of the received signal are called FADING
  • Can be attributed to a variety of reasons
  • Signals arriving at the receiver by more than one path (multipath – due to ionospheric variations) can either reinforce or cancel one another
  • Polarisation of the radio wave may be changed by propagation conditions resulting in an apparent reduction of strength
  • At vhf and uhf fading may be attributed to varying atmospheric conditions, temperature, humidity, etc.