Yagi antenna 868 MHz for LoRa Meshcore Meshtastic

This is my adaptation of 5-element Yagi antenna for LoRa 868 MHz

Most importantly - it designed to allow easy access to the ends of the driven element during assembly because it is better when wire is soldered directly to its ends.

All calculations based on online calculator:

Wire diameter: 2mm

Approx. gain: 10dBi

Lengths (Back-to-front):

Reflector: 168mm

Driven element: 162mm

Director1: 150mm

Director2: 149mm

Director3: 147mm

Assembly tips:

Mind the gap in the center - don't strip the coax wire too short or too long

You need to solder coax shell to its element first, put soldered end through the other hole, solder wire core and then fit holder elements. Holders are threaded and screws into the boom, aligning and centering driven element

You may need to hold elements with plyers or vice while screwing the holders to prevent twisting and unsoldering.

Always check for continuity or short-circuit before gluing everything

After assembly, fill the wire gap with some glue, i used CA glue with baking soda for hardening

Check driven element length - each driven element wire shoud stick out of boom by 75mm

M3 nut and M3x16 screw for handle