Why Yaesu choose to use BAND DATA 2 with the Quadra amplifier is beyond me - makes little to no sense. Using the CT-178 cable, the amplifier had to be on in order to use an antenna through INPUT 2 (corresponding to BAND DATA 2).
A younger friend made up a BAND DATA 1 cable for me for use with the radio and now, all works as expected (and how it always has with other Yaesu radios), regardless whether the Quadra is on or not.
