Both of the freestanding modules (NS73MFM transmitter, Arduino UNO) can be mounted to a breadboard and interconnected. Refer to the hardware setup and proceed. The simple code generates digital tones ...

When we think of a spark gap radio transmitter, most of us immediately imagine an early twentieth century ship’s radio room or similar. Most of us know these transmitters as the first radio s… ...

[Doz] fixes the heatsink mounting and incorporates a DDS frequency synthesizer with an Arduino for control. More after the break… The resulting transmitter is better, but there’s still a problem.