LaunchPad dev boards from Texas Instruments are cheap and easy to program, making them a great Arduino alternative if you can do without some of the bells and whistles. [ech0s] put his to good use … ...

The arduino turns the carrier oscillator (a super-simple transmitter, if you will. ) on and off. “OOK,” on-and-off-keying, is another term for CW.

Long-range RC transmitter “I started using Bluetooth devices like the HC-05 modules, but I found that these sometimes randomly disconnected. Since then I’ve been using the NRF24L01 modules ...