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Alexa Mini SDI sync problems with external SD monitor via downconverter

What the thread found

  • An Alexa Mini may experience intermittent sync loss when outputting to an SD monitor through a downconverter on the first SDI BNC output.
  • Changing the SDI output format from 24fps to 60fps resolved sync stability issues in one case.
  • The SDI output format setting on the Alexa Mini can affect compatibility with downconverters depending on the shooting format being used.

Depends on

  • The 60fps solution was not fully tested before the next shoot, so long-term reliability is not confirmed.
  • The issue may be specific to this particular camera, downconverter, and cable combination rather than a universal problem.
  • No investigation was completed on whether the second BNC output would have the same limitations.
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