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Si5351A VFO Frequency Stability in Portable QRP Applications

Building a compact 5-band QRP CW transceiver around an Si5351A clock generator for VFO/BFO duties. Using Arduino Nano control similar to ZL2PD's single-band design but extending to cover 20M through 10M. Experiencing frequency drift issues during portable operation - roughly 200Hz drift over first 10 minutes of operation in cold weather.

The VFO draws only 30mA at 3.3V which is great for QRP work, but temperature compensation seems inadequate for field use. Currently using the internal 25MHz crystal reference.

  • Has anyone implemented TCXO references with the Si5351A successfully?
  • Alternative: software temperature compensation routines?
  • Worth switching to a GPS-disciplined reference for portable work?

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