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Compatibility

This document describes the minimum and recommended hardware requirements for running OHB (Open HamClock Backend).

Minimum Requirements (Supported)

  • Hardware: Raspberry Pi 4–class compute (or equivalent)
    • Pi 3-class systems are not supported due to limited CPU, memory, and I/O throughput for scheduled fetch + render workloads.
  • Storage: 64GB microSDHC (or larger)
  • SD Card Performance: Use the fastest microSD card that is compatible with the Raspberry Pi 4
    • Preference: high-endurance / high-performance cards with strong random I/O and sustained write performance.

Recommended (Better Experience)

  • Raspberry Pi 4 with more RAM (4GB or 8GB preferred)
  • 128GB microSD (or SSD via USB 3.0)
  • Adequate cooling (heatsink/fan) for sustained rendering workloads

Why These Requirements Exist

OHB performs periodic background jobs (fetching upstream data, generating map assets, compressing images, and writing artifacts). These workloads are storage- and CPU-sensitive. Slower SD cards and lower-tier hardware tend to produce timeouts, long runtimes, and intermittent failures under normal update schedules.