Well, there is some new and different information in the posts above. I don't argue with the "experts" because there is always new and different models of radios coming out and the mfgers. frequently do not stick to their own rules ref. trainer cords, so user beware.

Airtronics: Own buddy cord. Looks like a Futaba but gray. Plugs look same but slight difference in size. Mine do not fit futaba.

Futaba: Several different cords in their series. Round plug both ends: Round plug one end and square plug one end: Square plugs both ends. One particular cord/plug is strictly made for simulators and does not work as a buddy cord, even though LHS sometimes sell them for such. [:'(]

JR: (Spectrum) Trainer cord is very small with a plug-in connector. My electronic knowledge level prevents use/mix of Futaba to JR or vice versa. Totally different plug system and wire type. Beware using JR. Plugging in the trainer cord turns on the radio electronics using the slave transmitter battery. Very few examples, only twice to my knowledge/use, however JR slave has been known to transmit on its own channel when the buddy cord is plugged in. My own JR buddy box has no crystal and is rewired for a small 9V alkaline battery which is adequate for many hours of training use.

Hitec: Compatible with Futaba as far as the round plugs go. My synthesized Prism 7 will transmit on the selected freq./channel when used in the slave position. I use two channel pins.



Ya'll be careful out there!