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Topic - Martyn Williams
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North Korea targets between 10 and 15 frequencies used by international short-wave broadcasters, such as U.S.-funded Radio Free Asia and stations operated by South Korea's government, for up to 18 hours a day, and on major occasions such as the April centennial, it jams radio signals around the clock, Mr. Williams said.
The North appears to have recently installed more sophisticated transmitters acquired from a Chinese company, although jamming operations have been up and down this year, likely because of technical problems or power shortages, he said.