Standard practice is Tx first Rx second when switching on, and Rx first and Tx last when switching off. Otherwise anything can happen, so there lies your problemThe link to that thread was useful. Someone there said the blue quartz had the best control for them.. Blue is the highest frequency 27 MHz crystal I know of. I would like to know if green works any better than blue... if not, then I wonder if the frequency might be a little higher than standard 27 MHz crystals.
What's weird for me though is that when I turn on the loco with no controller, it drives forward slowly, not at full speed.... I know it's not low batteries keeping it slow, because I can drive about twice as fast backwards with the RC car controller on the same battery. When I try to drive forwards with the RC car controller it's just as slow as without a controller. I wonder what else other than the transmitter and batteries might cause the forward movement to be weak and slow. It's almost as if it starts with no forward power at all, and then builds up a little bit of speed the longer it's told to drive forward. I imagine that if the problem is in the transmitter or the circuitry I should be able to de-solder the wires to the motor and reverse them, so that I could have fast forward movement and slow reverse, which would seem more appropriate.