Running into frustrating decode issues with WSJT-X where I'm seeing signals on the waterfall but getting zero decodes. FT8 and FT4 depend on computer time being very accurate and synced with NTP - shouldn't be out more than 0.4 seconds. Windows built-in NTP client can have issues syncing better than 0.6 seconds, so many FT operators use Meinberg NTP Package or Dimension 4. Each FT8 transmission must begin exactly at 00, 15, 30, 45, or 60 seconds - if station clock isn't synchronized, messages will fail to decode. What's everyone's preferred time sync solution for rock-solid operation?

Meinberg NTP Package is the current preferred option - been using it for over a year with zero timing issues. The built-in Windows sync is garbage for precision timing applications. Install Meinberg and your decode problems will disappear.

Check your DT column in WSJT-X during receive periods. If you're seeing consistent +/- values beyond 0.5 seconds, that's your smoking gun. When using FT8 and receiving contacts, look at the DT column to verify timing alignment.

Had this exact problem last month! Switched from Windows time sync to Meinberg and went from 10% decode rate to 95% overnight. Also helped that most FT8 users take advantage of online time servers using NTP or GPS signals for automatic time accuracy.