Radio and Electronics

1.  How is a digital radio different from an analog radio? What makes a digital radio more reliable?

Digital radios use numbers sent alone over a wider range with multiples of each number to have a better chance of the signal to be picked up and translated to sounds. This is why digital radios are more reliable. Analog radios send waves, which are carried by other radio waves to get to the destination. Sometimes, other things can interfere with the wave and mess it up. This is why the radio messages can sound crackly.

2.  What is the difference between AM and FM?    

Amplitude modulation (AM) waves are longer, slower, and bigger waves, while frequency modulation (FM) waves are smaller, quicker waves.

3.  What makes analog radios sometimes sound crackly?  

As I said, analog radios can sometimes sound crackly, because other things can interfere with the wave and mess it up, losing some of the pieces of the wave.