QRP Ham Radio Antenna Transformer Enclosure Version 1

thingiverse

This project box was designed to house a lightweight HF antenna system. The antenna is an End Fed Half Wave antenna. For more information on the design of the antenna system see the Facebook "End Fed Half Wave Antennas" group. This design has been refined by Steve Ellington, N4LQ. A 49:1 UNUN transformer wound on an FT140 toroid core sits in one of the compartments. A Common Mode Choke (CMC) made from a second FT140 toroid sits in the second compartment. For details of how the transformer and choke are made, see the above referenced Facebook group. This project is to house a low power (under 50 Watts) version of the antenna system designed by N4LQ. Normally, larger toriods are used to handle more power and the case is usually much larger. The inside dimensions of the spaces inside the box are 26 mm high by 52 mm wide by 67mm long, and 26 mm high by 52 mm wide by 71 mm long. Because the overall package is lighter and smaller, it can be backpacked for portable (QRP) amateur radio operations. The antenna wire and feedline can be wound around the outside of the box for storage. Esun PLA+ was used (210 DegsC, 60 DegsC), on an Ender 3. The box features 4 mm walls and tabs that appear to be stronger than the commercially available electrical boxes normally used. Revision 1: June 20, 2020: I've added the Fusion 360 file for those who would like to modify the file.