So you have 2 different interfaces connected to 2 different ports on your PC and you've tried them with 2 different transmitters and all settings and no possible combination works ?

1. Airtronics won't work with a Futaba lead, the connections are different (even if the sockets do look the same).

2. If you have really tried all settings and your Futaba Tx doesn't work at all with either lead/sim then I would suggest the Tx is dead, the battery is flat, you haven't switched it on or the buddy socket doesn't work (you can check this by seeing if it works *as a slave* with another Tx on a buddy lead).

Other than that perhaps by some weird coincidence BOTH leads are dead or both have plugs which do not seat properly in the radio socket.

Steve