Open-source tools for tracking OSCAR satellites, correcting Doppler across three CAT families, and printing the OSCARLOCATOR overlays — plus a dedicated M17 reflector for satellite ops. Built and flown by Paul Stoetzer, N8HM.
From a pocket tracker that Doppler-tunes your rig, to a full desktop analysis suite, to browser-based OSCARLOCATOR generators and a voice reflector for satellite nets.
A self-contained, offline-first satellite tracker for the M5Stack Cardputer ADV. Predicts passes with SGP4 and drives an Icom, Yaesu, or Kenwood radio over CAT with real-time Doppler correction — the “One True Rule” holds your signal steady at the satellite. Polar sky plots, an all-favorites pass schedule, AOS alarm, mutual-window finder, GS-232 rotator support, and full offline caching once GP data is loaded.
The tracking and orbital-analysis brain of CardSat, ported to a roomy desktop UI with embedded plots. Twenty-plus screens: a live 3D globe, sky radar, eleven pages of orbital analysis, link budgets and Doppler playbooks, mutual windows, illumination rasters, workable grids / states / DXCC, EME and space-weather panels — and one-click printable PDF reports. Runs out of the box on a bundled pure-Python SGP4, with the C-accelerated reference backend as an optional extra.
The classic AMSAT OSCARLOCATOR, reborn in the browser. Rotate the path-arc overlay over a polar or QTH base map and watch the satellite position and footprint move in real time — no printed transparencies required. Drive it live, seed it to the next pass, or scrub it by hand with equator-crossing longitude and minutes-after-EQX sliders.
Generate a print-ready OSCARLOCATOR right in the browser: pick a satellite and your station, and get the matching base map and path-arc overlay as a clean PDF you can print, cut out, and use at the operating position — the paper companion to the live simulator.
An M17 digital-voice reflector dedicated to amateur-satellite operating — a meeting point for M17 stations to coordinate passes, run nets, and talk satellites. Watch the live dashboard for connected clients and current traffic.
Licensed amateur radio operator and active AMSAT contributor, working at the intersection of satellite operating, RF hardware, and software. These projects share one orbital core — SGP4 propagation over AMSAT GP element sets and SatNOGS transponder data — expressed on everything from a pocket ESP32 device to the desktop and the browser.
If these tools are useful to you, please consider joining or donating to AMSAT — the volunteer non-profit that designs, launches, and operates the very satellites these tools are built to track.