Portable Satellite Antenna Build for Full Duplex Operation
Description
This page details the construction of a portable dual-band 2m/70cm Yagi antenna, designed for full duplex satellite operation with radios like the Anytone AT-D890UV. The author sought a lightweight, self-buildable antenna after reviewing commercial options like the ARRL Dual-Band Yagi. The design is based on DK7ZB's work, utilizing tape measure elements for portability and 3D-printed brackets. The author modified existing Thingiverse designs to adapt for a 19mm boom diameter, reduce size, and simplify the overall structure. The antenna features two elements for the 2m band, with the front element serving as the driven element, and three elements for the 70cm band, including a parasitic element. A five-turn choke is incorporated to prevent common-mode currents. Claimed gain is 4.1 dBd for 2m and 6.2 dBd for 70cm. The article includes design measurements and a photo of the completed antenna, noting that the build cost was minimal as materials were repurposed.