Question
Which of the following synchronizes WSJT-X digital mode transmit/receive timing?
Answer Options
- A) Alignment of frequency shifts
- B) Synchronization of computer clocks
- C) Sync-field transmission
- D) Sync-pulse timing
Correct Answer: B
Explanation
The WSJT-X suite of digital modes (FT8, FT4, JT65, Q65) achieves its remarkable weak-signal performance by using highly structured, fixed-duration transmission cycles (e.g., 15 seconds for FT8). For the receiver to correctly detect and decode the structured data, both the transmitting and receiving stations must be perfectly aligned in their timing.
The crucial element that synchronizes the transmit/receive timing for these modes is the synchronization of computer clocks at both ends of the communication path. Operators are required to synchronize their computer clocks to Coordinated Universal Time (UTC) using time synchronization software (like NTP or similar GPS-referenced sources) to within a second or less. This time accuracy ensures that transmission and reception cycles align perfectly.
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