This is an easy print and assemble Yagi for EU LoRa frequencies.
To assemble see the guide for other parts needed.
The measured SWR was 1.74
It was used for a stable Lora connection of 163Km during a mesh experiment
you will need:
- BNC connector. This needs a specific BNC connector see there are 2 possible sources Source 1 or Source 2 or you can find the same connector from another location
- 2 8mm M3 bolts
- 1m of 1.6 mm copper wire
- Push the copper with into the hole that have the bolt connectors in. Clear PLA helps to make a visual connection. Look into the bolt hole to be sure its reached the centre. When you can see the copper wire screw in 1 of the bolts. Tug on the wire it should stay in place due to the clamping action of the bolt (needed for the RF connection).
- Trim the wire flush to the edge.
- Repeat for the other driven element.
There is no difference between the driven elements.
This is the longest piece go all the way through. Make sure the wire is trimmed flush.
These are the 2 shortest holes (note that they are not the same length). Like the reflector these go all the way through.
The BNC connector faces towards the reflector (the longest element) its 2 pins should be bent so that the print action holds them onto the bolts
It drops into the hole, tightening the nut should mechanically attach the BNC connector to the antenna.
You may need to extent the pins slightly (see the close up of the connector)
Both the ground and centre of the BNC must contact the drive elements via their bolts.
Attach a pigtail to your lora device and ideally use a choke. (see picture). The shorter the feed the better.
This was built singing calculations from an online yagi designer (I forget which one). Its designed so that no precision cutting is needed as each element just needs to be trimmed flush. It offers around 7dBd or 9.5 dBi of gain.