cordless trainer using rx mounted on the rear of the tx plugged into the trainer jack ?

[DonaldNZ]

My apologies if this is in the wrong section

Master tx turnigy tgy 9x
slave tx HK HK6S


I have a friend who is willing to help me and suggested it may need a transistor to invert the ppm pulse. H?e did this some time ago on a futaba 9z around 5+ years ago when I would teach chopper, worked a charm.

He has asked if the tx has a reliable voltage at the trainer socket when plugged in to drive the rx and transistor ?
As no servos are driven he expects current consumption to be less than 20mA

[MikeB]

Er9x accepts either polarity for the trainer input. If the Rx outputs a CPPM signal, this should work without any transistor.

Mike.