QRP Manual ATU

Mini QRP Antenna Tuner PCB – L-C Tuned Circuit with SWR LED Indicator

All credit for designing and sharing this project goes to Scott Baker. This listing is for 1 x PCB that hosts an L-C tuned circuit plus a built-in SWR LED indicator.

What is it? This is the classic L-C antenna tuner design that many Chinese sellers offer online. However, unlike flimsy or poorly laid out versions, this particular board mounts all components on a rigid, high-quality PCB. The result is a durable, reliable foundation for your portable QRP antenna tuner project. The inductor can be either a single fixed component or you can build it using the designed T50 toroids for adjustable inductance.

Why was it made? To give portable operators a compact, low-cost, and effective tuning solution. Many off-the-shelf tuners are bulky or overpriced. This PCB lets you build a tuner that is small enough for POTA, SOTA, field day, or any go-bag. It follows a proven classic design but improves on it with a rigid board that holds up to field use.

What makes it special? First, it uses only one PCB – no stacking, no daughterboards, no complexity. Second, the footprint is exceptionally compact, making it easy to fit into tiny enclosures or even run without a case. Third, you are buying just the PCB, giving you the freedom to source your own quality components or salvage parts from your parts bin.

Perfect for: DIY hams, QRP enthusiasts, portable operators, and anyone who wants to build their own compact antenna tuner without designing a board from scratch.