SatTracker Manual

Welcome to the SatTracker user manual.

SatTracker is a standalone desktop amateur-satellite tracker from TopBytes Ltd. A 7-inch capacitive touchscreen driven by an ESP32-S3 shows a live world map of the satellites you follow — with their ground tracks and radio footprints — a 12-hour pass timeline, and a detail panel giving the selected satellite's azimuth, elevation and range, a sky plot of its next pass, and its uplink and downlink frequencies corrected for Doppler shift while it is overhead. It can alert you a few minutes before a satellite you care about makes a good pass.

SatTracker focuses on the satellites radio amateurs can actually work: FM repeaters such as SO-50, AO-91 and the ISS, linear transponders such as RS-44, FO-29 and AO-7, APRS digipeaters, and the geostationary QO-100.

It needs nothing more than a 2.4 GHz WiFi network and a USB-C power supply. Orbital data is downloaded automatically and all pass predictions are calculated on the device itself.

The SatTracker main screen (NEON theme), with AO-27 selected and its track running to its next pass.

SatTracker

• Introduction
  • What is SatTracker?
  • Key Features
  • How It Works
  • Use Cases
  • System Requirements
  • Next Steps
• Getting Started
  • Unboxing and First Power-On
  • First Boot Sequence
  • The On-Screen WiFi Setup
  • After WiFi Connects
  • Setting Your Home Location
  • Setting Your Timezone
  • Verifying Successful Setup
  • What's Next?
• Operation
  • Screen Layout
  • The Top Bar
  • The World Map
  • The Pass Timeline
  • The Detail Panel
  • Upcoming Passes Table
  • Pass Alerts
  • Choosing Satellites
  • Geostationary Satellites (QO-100)
• Configuration
  • The Settings Page
  • Location
  • WiFi
  • Timezone
  • Orbital Data
  • Satellites
  • Pass Alerts
  • Night Mode
  • Screen
  • Theme
  • Brightness
  • About / Update
• Troubleshooting
  • Quick Checks
  • Time and Predictions
  • Alerts
  • WiFi Problems
  • Display Problems
  • Device Registration
  • Getting Help
• Advanced Features
  • How Pass Prediction Works
  • Doppler Correction
  • Frequency Data
  • Over-The-Air (OTA) Firmware Updates
  • Device Registration
  • Network Administration
  • Time Synchronisation
  • Serial Console
  • Power Consumption
  • Security Notes
  • What's Next?
• Technical Specifications
  • Hardware Specifications
  • Tracking Specifications
  • Network Specifications
  • Performance Specifications
  • Compatibility
  • Data Sources
  • Support and Documentation
• Compliance
  • Radio Equipment Information
  • EU Declaration of Conformity
  • UKCA Declaration of Conformity
  • FCC Statement
  • RF Exposure Information
  • Safety Warnings
  • Intended Use
  • WEEE — Waste Disposal Information
  • Manufacturer
  • Firmware Updates
• Changelog
  • 0.1.0 — October 2026

Quick Links

• Index

• Search Page

About This Manual

This manual covers:

• Powering on and the on-screen WiFi setup

• Setting your home location (Maidenhead grid or latitude/longitude) and timezone

• Reading the world map, pass timeline and satellite detail panel

• Frequencies, modes and Doppler correction

• Choosing satellites and setting up good-pass alerts

• The NEON and OPS display themes, brightness, night mode and screen rotation

• Troubleshooting connectivity and display issues

• Firmware updates (OTA) and technical specifications

Data Sources and Credits

SatTracker uses data provided by third parties:

• Orbital elements (TLEs) are provided by CelesTrak (amateur radio satellite group).

• Transmitter frequencies and modes are compiled from a TopBytes-curated list and the SatNOGS DB (CC BY-SA 4.0).

• Coastlines are from Natural Earth (public domain).

Orbits are propagated on the device with the SGP4/SDP4 model (the SparkFun SGP4 Arduino Library, a port of David Vallado's reference implementation).

Regulatory and Safety Information

Per Radio Equipment Directive 2014/53/EU, Article 10(9)

Hereby, TopBytes Ltd declares that the radio equipment type SatTracker (Model: SATTRK-01) is in compliance with Directive 2014/53/EU.

The full text of the EU declaration of conformity is available at Compliance.

Support

For additional support, please visit:

• Website: https://www.topbytes.net

• SatTracker Portal: https://sattracker.topbytes.net

• Support email: support@topbytes.net