Setting up and using LoRa APRS for SOTA![edit]
This Wiki has been set up to provide resources for anyone looking to experiment with LoRA APRS for Summits on the Air (SOTA). It has a focus on use in the UK but most of the information will be relevant to users in other areas. Use the NAVIGATION button above to see what is here.
Feel free to add and edit content here.
What's it all about?[edit]
The Automatic Packet Reporting System (APRS) is a radio data system that can be used for a variety of things. Uses relevant to the Summits on the air programme (SOTA) include:
- Position reporting
- Self spotting
- Weather
- Links to email, Whatsapp and SMS in areas where there is no cellphone coverage.
...but perhaps most importantly it's fun to set up and use your own mobile data networks.
What's LoRa got to do with it?[edit]
LoRa is a radio protocol and modulation scheme that was developed for applications such as the Internet of Things. LoRa transceiver modules are usually integrated onto small PCBs that include a microprocessor, display, GPS, Bluetooth, WiFi and battery power management. Firmware for these PCBs is available from Ricardo Guzman's excellent Github repository. Ricardo is perhaps the single most influential person whose hard work has made LoRa APRS a reality. Thanks!
The LoRa transceivers are low power modules with a maximum output power of 100 mW (20 dBm). In the UK radio amateurs use a frequency of 439.9125 MHz for LoRa APRS. 100 mW on 70 cm may sound like a recipe for short ranges and poor performance. However, due to the clever modulation scheme, SOTA activators regularly use LoRa APRS over ranges in excess of 100 km.
Where can I buy one?[edit]
There is currently no source for ready made LoRa trackers and infrastructure. To use this system you will need to put it together yourself. While, it's generally easy, you may need help. For assembling most of the things, no soldering or tools are required.
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