How do radio waves travel?
Sketch a diagram showing how radio waves travel locally and around the world. Line-of-sight where the antennas can “see” each other. (You to #1 in this picture) If a hill is in the way, a repeater on top a mountain or building can relay the signal over it. (You to #2) High frequency (HF) radio bounces off the ionosphere long distances (You to #3) (Skip) Signals can also be relayed by satellite or even moon bounce or meteor trails. HF radio propagation is affected by radiation from the sun, so different frequencies work better at different times of the day. How do the broadcast radio stations WWV and WWVH help determine what you will hear when you listen to a radio? WWV in Colorado and WWVH in Hawaii broadcast the time on several frequencies. By listening for these stations on their regular frequencies you can tell how good signals from those states are on the different radio bands. Time is given in Coordinated Universal Time (UTC), also known as Greenwich Mean Time (GMT) or Zulu (Z), w
