I have a Futaba T6exap that I would like to use with a Futaba T4yf as a buddy box. The T4yf is suppose to be set up as a buddy box only. the 4yf has no antenna, battery, or Xtl. Will this setup work together?

I have also observed that when the trainer switch is lifted on the t6exap I still have control with the 6exa. Is this correct?

One more thing the cord that came with the buddy box seems to have a Jr end and a Futaba pig tail. Dos this mean that I can use the t4yf buddy box with my Jr f400?