Dualband-Moxon-Beam for 10 m and 6 m
Build a compact, high-gain dual-band Moxon beam for 10m and 6m.
Description
The DK7ZB-Dualband-Moxon-Beam provides a compact, high-performance antenna solution for 28 MHz and 50 MHz operations, utilizing a single 50-ohm feedpoint. This design functions as a mini-beam on 10 meters, achieving a gain of 4.0 dBd with a front-to-back ratio of 30 dB, while operating as a 2-element Yagi on 6 meters, yielding a gain of 4.3 dBd and an 11 dB F/B ratio. The antenna's dimensions are approximately two-thirds that of a full-size 10-meter beam, making it suitable for smaller spaces.
Construction details include a parts list specifying aluminum tubes of various diameters and lengths for the reflector and radiator elements. Builders like Aleks (S54S) and Marcio (PY2OK) have successfully replicated the design, with Aleks noting the utility of bending corners during assembly.
Fine-tuning is accomplished by adjusting the length of specific elements that slide into larger tubes. The feeding system incorporates a balun, with options for either 300 watts using RG188 on an FT140-43 core or 1 kilowatt using Aircell-5 on an FT240-43 core, ensuring versatility for different power levels.