Hitec to Futaba trainer cable, possible ?
You can use either lead but if you use a Futaba lead with a Hitec Tx as SLAVE it is important to take the crystal out of the slave transmitter. Otherwise you will find that BOTH Txs are transmitting RF at the same time. This is not a good thing !
The Hitec lead solves this, provided you connect it the right way round. The main difference is that pins 4 and 5 are not connected on the MASTER/INSTRUCTOR end of a Hitec lead and on the SLAVE/STUDENT end they are shorted together. That's what stops it transmitting.
Steve