I’m wrong Grey wolf is probably right. You need to get a receiver compatible with your controller. I wasn’t sure I haven’t changed a receiver in a while.
Yeah basically. The ESC powers the RX (receiver) and your servo(s) through the positive and negative wires in teh 3 wire leads, but the RX tells the ESC and the servo what to do via the signal wire which is the 3rd wire in the 3 wire lead. Then of course the ESC feeds and controls the motor itself. You are correct though that if you have a stand alone TX (transmitter/controller) and RX then you can run any ESC/Motor combo you want.