Sanwa TX controlling two RX??

[Monkeysmate]

I'm new to Sanwa, but is this normal?

If my lad has his MT-S TX set to "model-1", he races quite merrily with his 2wd. When we go to race 4wd, if he forgets to change the model, and leaves the TX set to "model-1", they TX "talks" to the RX in the 4wd such that it will pull away when he pulls the throttle, but the steering is uncontrollable...

When he switches his TX to "model-2" the problem is resolved, and the 4wd behaves itself.

Is this normal? I know on Spekky that the TX and RX wouldn't talk at all unless they were on the correct model.

This seems quite strange...

Ta
Tim