Utilities for sending APRS packets with an SDR. It can be used both as Web app and standalone binary.
The Web version is using the HTML Geolocation API to retrieve the device's position and WebUSB to talk with the SDR. It is deployed at https://xakcop.com/aprs-sdr and works like this:
For now it supports only HackRF but more SDRs can be added in the future. I have been testing only with the Google Chrome browser on Linux and Android (Pixel phones). My results show that the tracker works great on desktop Chrome and not so great on mobile Chrome. Sometimes, after sending a couple of packets on mobile Chrome, the scripts hangs at device.transferOut(). I guess this is a bug in the mobile implementation of WebUSB but I could be wrong. Any ideas how to fix this are appreciated. Feedback for other browsers and platforms is also welcome!
You need the Emscripten SDK to build the Web version:
$ CXX=emcc make
The site should be served from the /docs folder.
The desktop version relies on gpsd to retrieve the device's position:
- GPS device - Any GPS device supported by
gpsd. You can also use a mobile phone and stream GPS data using an app like this one - gpsd - GPS service daemon
- aprs-sdr - This program which retrieves data from
gpsd, generates APRS messages and produces complex sampled IQ files that can be transmitted with an SDR - SDR device - Any transmit capable SDR (e.g. HackRF, USRP, LimeSDR, etc.)
Simply run make. You can find some example scripts in the /bin folder.