Software part - HotSpot firmware
You are ready to be QRV on your favorite digital amateur radio network. The equipment that I’ll take with me is:
- a Raspberry Pi 3 case
- a case with the STM32F103 and UHF module
- a 5V power supply unit (or 5V USB power pack)
- a smartphone to share my internet connection
- a digital transceiver (for me, a Retevis RT3, DMR mode)
Overall, the price of such a Hotspot is rather low as it is around 75 EUR, including Raspberry Pi and SD card.
And what’s the future?
Some have sought to reduce the place of all this. See this board designed by Mathis DB9MAT, which is a board that brings together the UHF module, the STM32F103 CPU, and wich is plugged directly onto the smallest Raspberry Pi, the Pi Zero W. This is called the MMDVM HS HAT (Hardware Attached on Top).
Mathis resources are online on GitHub. But there it could perhaps be the subject of another article on my blog….
Feel free to post your questions and comments below. I will of course be happy to answer them.