JR - delta on buddy cord

On Tue, 20 Nov 2007 21:21:26 -0500, "Don Sanford" wrote in :

It seems to me that the JR & Hitec systems require that the buddy box be capable of doing mixing. The master TX just passes the signals along from the buddy box without much (if any) extra interpretation.

I don't know whether the same is true of other makes.

Marty

wrote in :

swap the transmitters and let the pupil use xf421 ???

| It seems to me that the JR & Hitec systems require | that the buddy box be capable of doing mixing. The | master TX just passes the signals along from the | buddy box without much (if any) extra interpretation.

It's not just JR and Hitec -- it's all the lower end master TXs. And it's `no interpetation at all' rather than `not much interpetation'.

Generally, what happens is that each (master and buddy) TX takes all it's gimbal positions, all it's switches and mixes and such and comes up with a final PPM signal, one for each TX.

If the trainer switch is engaged, the PPM signal from the buddy box is transmitted. If not, it's the PPM signal from the master. Signals from the two boxes are never mixed, and the master never mixes the slave's channels in any way.

A few of the higher end transmitters can decode the signal from the buddy box, and then use that signal to replace a few of it's gimbal/switch inputs if the training switch is engaged, and then run that through it's mixers and transmit the resulting signal. I know the Futaba 9C and I think the Multiplex Evo 9 have this feature, and newer models of those lines probably have it too. I don't think any Hitec radios have it, and I imagine that the fancier JR radios do, but I don't know for sure.

Older/cheaper TXs of all models do NOT have this feature. But if you have a TX that does, you can use it as the master, and just use a basic 4 channel buddy box with no programming capability as the slave.

On 26 Nov 2007 22:33:00 GMT, "Doug McLaren" wrote in :

I have the feeling that the trims on my JR master transmitter might override the trims on my JR buddy box--but I could be wrong. It's been a while since I set it up.

My friend's Futaba 9-channel TX lets you pick which channels the buddy box can control. It may not be mixing, but it does do subtraction.

Marty

My Futaba 8U Super will do as you describe - just look at the gimbals of the buddy box and use all the internal mixes setup for the current model. The few times I tried it, it did work quite well.

Alex.