RE: For Futaba 6J and 8J owners
So, we can either believe Krysta at Futaba service, or not.
Page 8 of the 8J manual clearly says that ALL servos will work, including winch, retract, and digital servos.
If you have a receiver that can be set to a high speed mode, then you do need to use digitals when in that (HS) mode. However, when in normal mode you can use ANY servo type. This started with the R603FS receivers and continues with all receivers capable of the 2 modes, normal and high speed.
However, the radio itself and the transmission type in particular does not care. FHSS or S-FHSS, BOTH will work fine with either servo type. S-FHSS is NOT a high speed mode, it is just a slightly different protocol.