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Raspberry Pi 4 WSPR beacon drifting on Si5351 - GPS sync working but frequency unstable

Built a multi-band WSPR beacon using RPi 4, Adafruit Si5351 breakout, and u-blox NEO-6M GPS module. GPS sync is solid, timing is perfect, but I'm seeing significant frequency drift on all bands - roughly 15-20 Hz over a 2-minute transmission cycle.

Currently running the VK3HN Arduino sketch ported to Python with JT65encode library. The Si5351 is running at default 25MHz reference with no TCXO upgrade.

  • Beacon transmits properly and gets decoded
  • Frequency starts on-target then drifts high
  • Temperature doesn't seem to correlate with drift pattern

Has anyone successfully compensated for Si5351 drift in software, or is a TCXO upgrade the only real solution for stable WSPR?

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