Plain-language answer: CW communication keys an unmodulated carrier on and off to send Morse code.
Why operators care
Its narrow receive bandwidth and human pattern recognition can support contacts below the level comfortable for voice, but operator skill and stable tuning still matter.
How to use it well
Choose a clear frequency, use a comfortable keying speed, keep rise/fall shaping clean, and match receive bandwidth to conditions.
The common mistake
Assuming higher keying speed always produces more contacts in weak or crowded conditions.
Operating boundary
Predictions, reports, schedules, and mode descriptions guide a decision; they do not override current regulations, equipment limits, exact station conditions, or what the operator verifies on air.
