D.I.Y QRP Unun

A basic PCB unun with a BNC connector for QRP operation, ideal for use with a Half-Wave End-Fed (HWEF) or long-wire antenna for HF bands.

You can build a 1:1, 4:1, 9:1, or 49:1 unun using an FT82-43 Ferrite Core Toroid Ring.

Gerber file for PCB:

Below is the list of components from RS online:

Unun can be tied to PCB using zip ties, antenna wire can be connected using ring terminal.

73’s

2E0UMR