DSX221G DSX221G 14.7456MHZ DSX221G 16.000MHZ DSX221G 16M DSX221G 16MHZ DSX221G 16MHZ 9PF 20PPM DSX221G 19.2000MHZ DSX221G 19.2M DSX221G 20.000MHZ DSX221G 20MHZ