What attracts a lot of people to amateur radio is that you can use it to make your own equipment. Scratch hams usually start out by making their own antennas, but at some point the itch of building your own radio has to be scratched off. And build this one-transistor transmitter is the easiest way to immerse yourself in the world of DIY radio.
Of course, if you limit yourself to eight components in total, you have to make some sacrifices [Kostas (SV3ORA)]The station is clearly a compromise study. It’s just a sender for starters, so you’ll need to take other precautions to have a meaningful conversation. You’ll also need to learn Morse Code as the minimalist build only supports CW (Continuous Wave) mode it can be changed for amplitude modulation (AM) speech work.
The circuit is flexible enough that almost any part can be replaced and the transmitter continues to work. Most of the parts are garbage cans, although the main transformer must be manually wound. As described, the transformer not only provides feedback to the transistor oscillator, but also has a winding that controls an incandescent lamp and offers taps for attaching antennas with different impedances – no external tuner required. [SV3ORA] provides detailed instructions on how to wind the transformer and shows the final build which looks very professional and neat. The following video shows the rig in action with a separate receiver providing sidetone. There is also the option of one of the WebSDR receiver Scattered around the globe to see if you can get off.
This little transmitter looks like a lot of fun and we can just give it a try our $ 50 Ham series when we can find all the parts. In all fairness the variable capacitor is the hardest to come by, though There are ways around that also.