DRM guarantees high-definition, high-fidelity, and stereo broadcast programs on the shortwave band, and has the potential to revolutionize shortwave broadcasting.
Gospell GR-216 and GR-228BP are affordable shortwave digital radios that can receive DRM broadcasts.
Shortwave is a wavelength range of radio, and its corresponding frequency range is called high frequency. The wavelength range of shortwave is 10 meters to 100 meters, and the frequency range is 3MHz to 30MHz.
In addition to being able to use ground waves to propagate electromagnetic waves in the short-wave band, they can also be transmitted over long distances through the reflection of the ionosphere. They have strong penetrating power and are not easy to interfere. Therefore, international broadcasts are usually located in the short-wave band.
Shortwave broadcasting is broadcasting using shortwave bands. Because of its strong penetrating power and not easy to interfere, international broadcasts are usually located in the shortwave band. With high strategic value, it is still widely regarded by experts as the most effective way of large-scale global transmission, and it is safe, cheap and fast.
After the advent of the Internet, there have been discussions about abandoning shortwave; VOA shortwave broadcasting has also been discussed and abolished, but shortwave broadcasting is still retained at the insistence of the US Secretary of State. However, many professionals believe that compared with the Internet, shortwave broadcasting has "fast and safe advantages".
From the perspective of security, logging into the network may allow government authorities to track down relevant traces. However, when listening to shortwave broadcasts transmitted through the air, it is difficult for the authorities to find listeners, and the safety of media audiences can reduce risks.
Totalitarian authorities can easily and completely cut off the Internet technically, but it is not easy to block short waves.
Radio broadcasting is still the main source of information for many people around the world: "Based on the fact that many people in the world are illiterate or unable to use the Internet, radio broadcasting is arguably the most democratized and most popular medium in the world. The way for millions of people is radio broadcasting."