Sanwa binding issue

[paulainscow]

I've just got a new car, which has the same sanwa 451 receiver in as my other car. The transmitter is the sanwa Gemini. I'm trying to bind it so model 2 is different bind from model 1, and I can just run the one handset

But, even though I have binded it as individually as different model numbers, no matter which I select it controls both cars if both are powered up

Is there a way I can have them on seperate frequencies?