Shortwave Antenna 1:1 Balun

1:1 shortwave antenna BALUN DIY. The current-type BALUN winding scheme is adopted, and the American RF ferrite magnetic ring FT-114-43 (magnetic permeability: 850μi) is used as the material. The wire is RG316 RF cable, as well as terminal blocks, BNC RF female socket, etc. The main body uses 1.6mm thick PCB as the wire frame.

The production process is relatively simple. Wrap the RG316 RF cable around the magnetic ring FT-114-43 for about 12-15 times, and then weld the shielding layer and core wires to the PCB respectively. Finally, install the BNC RF female base and related terminals, screws, etc.

Use NANO VNA to test short-band indicators, with sampling frequency points from 1-30MHz. Connect a 50-ohm radio frequency resistor to one end of the vibrator. The standing wave reaches a minimum of 1.01 at a frequency of 1MHz. The higher the frequency, the higher the standing wave. At a frequency of 30MHz, the standing wave is 1.40. The production effect is okay!

Since I am a QRPer and am used to low-power communication, I named it QRP BALUN. In fact, the transmit power up to 20W is no problem. Advantages: small size, easy to make, easy to carry, suitable for temporary or outdoor communication. Disadvantages: poor waterproofing, medium power resistance.

DIY methods and tests are for reference only...