AT-51AD 10.240MHZ AT-51AD 4.000MHZ AT-51AD_8.000MHZ AT-51CD 12.000MHZ AT-51CD 4.000MHZ AT-51CD 5.0MHZ AT-51CD2 10MHz AT-51CD2 12MHz AT-51CD2 9.216MHz AT51CD2. 48MHZ