Plain-language answer: ARRL International DX Contest pairs stations in the continental U.S. and Canada with DX stations in a structured exchange.
Why it matters
Eligibility, exchange content, categories, power, assistance, and scoring depend on which side of the contact and the current event rules.
Use it correctly
Program the correct exchange, check the current country and multiplier definitions, and ensure the log identifies the actual operating location and category.
The common mistake
Sending the exchange used by the opposite side of the contest.
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.
