The VEX Robotics Design System is designed to be usable in a competition setting with multiple robots on the field together at the same time. The transmitter's frequency module and the matching receiver crystal determine the control frequency for a robot. Each robot operating at the same time should be on a different control frequency. There are 2 different kits containing 4 crystal pairs each, A and B. You can also get a single Channel 61 Crystal Pair.
The transmitter’s frequency module and the matching receiver crystal determine the control frequency for a robot. The receiver will hear only commands sent by transmitters using the same frequency. However, a robot will also hear commands sent by every other transmitter using the same frequency, so you’ll need to make sure that nobody else uses the same frequency as you.
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