Radios sold in North Korea are modified so they can only tune in to certain frequencies – government-operated North Korean stations, of course. But people do illegally “jailbreak” their radios, says Reporters Without Borders. They can then listen to South Korean stations near the border, or to shortwave foreign broadcasts like the BBC’s and similar ones from Radio Free Asia and Voice of America.
“North Korea does its best to stop the broadcasts coming in but it is the only way that exists at the moment to get current information into the country,” said Williams.
The North Korean government tries to limit what their citizens can hear. Radios can be modified, but a more effective way is to “jam” incoming signals. According to Williams, the concept is simple: the government will broadcast a whooshing or clicking noise over the same bandwidth to drown out the news.
quoted from https://globalnews.ca/news/3776420/nort ... ropaganda/