XX9C is the special contest station for CQWW Contest. The station operated in year 2002 and 2004 CQWW Contest.

This year 2006, XX9C also signed on again in CQWW SSB.

XX9C is one of the club station callsign of Macao Amateur Radio Association (ARM), which is IARU member society in Macao SAR, China.

2006 XX9C QSL Manager is BA4EG, QSL info: Feng Zheng（BA4EG）, 552-39-502 Zao Zhuang Lu, Shanghai, 200136, China