The article does not make clear what frequencies are used. The
services might be in the LW, MW, SW, or even the FM bands.

Sending Out Signals to Long-Isolated North Koreans

http://www.washingtonpost.com/wp-dyn...122900579.html

http://tinyurl.com/238c6k

Sending Out Signals to Long-Isolated North Koreans
Defectors Who Once Worked for Government of Kim Jong Il Now Broadcast
From South of the DMZ

By Francine Uenuma
washingtonpost.com Staff Writer
Sunday, December 30, 2007; Page A27

.....
The North's estimated 23 million people have little accurate
information about the outside world. Listening to foreign news sources
is illegal, part of a government effort to block infiltration of
subversive ideas. But as more North Koreans buy low-cost radios
brought in from China, violating that ban has become easier.
.....

All told, Seoul has three privately run radio stations targeting the
North: Open Radio for North Korea, Radio Free Chosun and Kim's FNK,
the only one run by defectors, who are helped by a committed South
Korean staff. Washington-based Radio Free Asia and Voice of America
also broadcast to the North.