Thanks 🙏 I published 3D printed files on Printables. Pictures there are older, I have to upgrade them, but files are up to date.

And I offer fully assembled station on my Lectronz store, too.

www.printables.com/model/102750...

Looks like an interesting project. ⌛ Can you share more details, please? Why four Pi? Is it .are accurate than PTP?

Multiplayer chess with everyone on the network? ♟️😁

Thank you! I thought it looked like the Mikrotik antenna.
Based on your measurements, it seems it's worth the investment.

You can use emojis, you know that? 😁 No words needed.

Good job with the measurements.

Some of them are clearly not for 868 band. I wouldn't expect most of them behaves this poorly.

May I ask which antenna the second one is? It seems to be the best suited for the 868 MHz band.

Still need to 3D print an enclosure for this, but otherwise, it's working perfectly. It’s a simple upgrade anyone can make to those $5 LED chains.

This is exactly the kind of project my USB-C charger was made for. It’s not just a charger - it’s also a USB-UART converter, an UPDI programmer, and a tool for small, versatile mods like this one. I'm so happy with this design.

The best part? I can recharge the battery with any standard USB-C charger. No more fiddling with external AA battery chargers or throwing out alkalines. Just plug and go.

So, I grabbed one of my USB-C battery chargers (a design I made myself in KiCAD) and modded it to output 2.9V instead of its default 3.3V. Now the LED chain runs at constant brightness, powered by a 1000 mAh LiPo. Rechargeable, reusable, hassle-free.

The original chain used 2 AA batteries—no electronics, just direct power to LEDs. It worked, but dimming lights as batteries drained was annoying, and swapping batteries constantly? Not great for convenience or the environment.

Thanks for your interest. Can you send me a DM, so we can talk about details, please?
I don't know why, but I cannot send you a DM for some reason.

Preparing a 915 MHz version shouldn't be a problem -- it's just a matter of swapping the RAK module. If there's enough interest, I can make a 915 MHz batch. However, I don't have much experience with shipping outside the EU.