Simple transmitter remote control commands were usually accomplished using a rotary telephone-type dial. Eventually, the rotary dial was replaced and capabilities were multiplied by DTMF control tones ...

With this circuit, a single transmitter and simple set of user pushbuttons can initiate one of four different outputs, two at each of two remote receivers with very different ...

[Joel] has a remote control ceiling fan. It’s nothing special, the controller has a low-power 350MHz transmitter and a Holtek encoder to send commands by keying the transmitter’s output ...

A discrete mute control lets you quiet the FM transmitter if necessary. The device is powered from the USB bus, and features user-adjustable output frequencies from 88.1MHz to 107.9MHz.

Test by connecting to the receiver with the propellers left off. Power up and trim each pot till the motor doesn’t move with the transmitter’s corresponding stick at neutral position.