There are two kinds of dedicated radio listeners. Most are those who listen regularly to their FM or AM station of choice, or to a station that only broadcasts on the internet. The rest are dedicated to other frequency scales: high frequency (also known as shortwave), followed by very high frequency and, after that, the ultra high frequency range, which includes police scanner talk and even satellite signals. Shortwave listeners encounter a world of mostly international radio stations broadcasting from countries like China, Cuba, Iran, or Romania. These frequencies also include amateur radio and marine and air traffic. Sooner or … Continue reading Explaining the ‘Mystery’ of Numbers Stations