Plain-language answer: CQ World Wide DX is a major international contest emphasizing contacts across DXCC entities and CQ zones.
Why it matters
Phone and CW events have detailed categories, assistance definitions, band-change rules, power limits, and log requirements that can change.
Use it correctly
Choose the category before operating, use the current zone data and rules, verify callsigns and exchanges, and submit the Cabrillo log on time.
The common mistake
Selecting a category after the event based on what the log appears to score best.
Decision boundary
Current regulation, program rules, manufacturer limits, exact station configuration, and live observations control. Recheck changing rules, solar conditions, and operating status before acting.
