AT-51-6M-STD-PFV-2 AT517A AT518 AT-518.000MHZ AT-51-8M-STD-PFV-2 AT-51-9.6M-STD-PFV-2 AT51-AD AT-51AD 10.240MHZ AT-51AD 4.000MHZ AT-51AD_8.000MHZ