Yagi antenna 868 MHz for LoRa Meshcore Meshtastic - Free 3D Print Model

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Epistaphrosiy

Hobby & DIY>Other Hobby & DIY

IP Report

Print Profile(1)

All

0.1mm layer, 4 walls, holders by object, fuzzy handle

Designer

3.7 h

3 plates

5.0(2)

Open in Bambu Studio

Boost

192

165

Released

Description

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

Comment & Rating (7)

@user_2793570833

great design. would love to have this for 910MHz

@Soupbones

Good design but the handle looks like you hold the antenna with the orientation horizontal. Most Meshcore/Meshtastic uses vertical polarized antennas. Having to hold this horizontal defeats the purpose of having a Yagi to obtain gain as loss will be at least 20db up front holding it horizontal.

@user_2623235214

Lengths (Back-to-front): Reflector: 164mm((164-12)/2=76) Driven element: 160mm((160-12)/2=74) Director1: 146mm((146-12)/2=67) Director2: 150mm((150-12)/2=69) Director3: 144mm((144-12)/2=66) MMANA error Correction 869->885mhz

@user_3648173855

Lengths (Back-to-front): Reflector: 168mm((168-12)/2=78) Driven element: 162mm((162-12)/2=75) Director1: 150mm((150-12)/2=69) Director2: 149mm((149-12)/2=68.5) Director3: 147mm((147-12)/2=67.5)