The SWL QSL Museum Cambodia/Kampuchea Asia Voice of  Democratic Kampuchea / Radio Democratic Kampuchea - Clandestine - Station Overview QSL Contributed by Hashimoto Kenji (Japan)  The shortwave frequency 6974 kHz used by clandestine Khmer Rouge-linked broadcasts around 1990 was relayed via transmitter facilities in China (such as Radio Beijing relay equipment) rather than a disclosed internal site inside Democratic Kampuchea. Clandestine stations representing the faction frequently shifted frequencies and utilized external or mobile border setups during this transitional political era.