How Radio Waves Travel

Lesson 3 At what frequency does alternating current (AC) start propagating as a wave?   10 kHz  is when AC emits radio frequencies. What is the range of short wave frequencies that propagate as skywaves?   (3- 30 MHz). What causes ions to develop in the ionosphere? Ions are produced from the sun.  Solar radiation …

Electromagnetic Energy

Lesson 2 1. What is electromagnetic radiation? Electromagnetic radiation or EMR is electrically charged particles and uncharged magnetic forces. 2. What is frequency a measure of? Frequency is a measure of a certain number of crests passing a certain point in a second.  Then measurement is in Hertz. 3. What frequency range does "shortwave" fall …

Radio & Electronics Introduction

Lesson 1 1.  How is a digital radio different from an analog radio? An analog radio sends information by changing the shapes of waves.  It’s a direct physical change to an existing wave.  So the trouble is that if something disrupts or gets in the way of the natural wave the signal can get lost.  …