Some Chinese DXer informed, in mid December, DRM test transmission with non stop Chinese music has been noted throughout the day on 1557kHz. The signal is over Zhongshan City, Guangdong Province, displaying “Drm(GD_ZS)”. “GD” means Guandong, “ZS” means Zhongshan.
According to the other information, DRM broadcast is planned also in Guangzhou and Huizhou, Guandong Province, on the same frequency and format.
1557kHz is used by Radio Taiwan International (RTI) for Chinese service to Chinese mainland in the night (over Kouhu transmitter site, 300kW, at 0900-1700UT except 1100-12:00 KBS relay). China has set up many MW stations on 1557kHz to jam RTI. So this “DRM test” is actually a new jamming to RTI with DRM technology.
It is said the DRM coding software and modulator was developed by Communication University of China in Beijing. The transmitter is “GZ-G10K”, 10kW MW DRM transmitter , manufactured by Harbin Broadcasting Equipment Co. Ltd.
In addition, some MW transmitters in Yunnan, Liaoning, Jiangsu and other provinces have also carried out DRM test broadcasting, but the specific test information is not announced. Some informed Yunnan uses name “YUNNAN Broadcast”, xHE-AAC code, ID: 9FFF05.
Original information is at https://cahcn.github.io/posts/2024-12-19-1557khz-drm.html.
Takahito Akabayashi, Tokyo. Japan to WOR iog (2024-12-22)