On amateur radio, Morse transmission is usually called CW. A basic contact is short, structured, and easier to follow when both operators know what information comes next.

What CW means

CW stands for continuous wave. The transmitter produces a carrier, and the operator switches it on and off with a key or electronic keyer. A receiver turns those keyed bursts into an audible tone. The information is carried by the timing of the signal, not by a voice modulating it.

A CQ call invites a reply

CQ is a general call. An operator sends CQ, identifies the station, and finishes with a signal that hands the frequency to a possible respondent. A simplified pattern looks like this:

CQ CQ CQ DE [CALL] [CALL] K

DE means “from,” and K invites another station to transmit. Real callsigns and procedures are governed by the operator’s licensing authority, so a translator exercise is not permission to transmit on amateur frequencies.

The reply establishes who is present

A responding station sends the called station’s callsign, DE, its own callsign, and K. Once both identities are clear, the contact can move to a signal report and basic information. Repeating critical information is normal when conditions are weak, but excessive repetition occupies the frequency without adding clarity.

Common information in a first contact

  • RST: readability, signal strength, and tone report.
  • QTH: station location.
  • NAME: the operator’s name, often sent in a predictable group.
  • RIG and ANT: equipment and antenna, when the operators want a longer conversation.
  • WX: local weather.

Abbreviations reduce transmission time, but they work only when both people understand them. QSL acknowledges receipt, QRS asks for slower sending, and AGN asks for a repeat. Sending plain language is better than forcing obscure shorthand into every sentence.

Closing the contact

73 is a customary friendly closing. The prosign AR marks the end of a message, while SK marks the end of contact. Prosigns are sent as joined patterns rather than as two normally spaced letters.

Good operating begins with listening

  1. Listen before transmitting and make sure the frequency is not in use.
  2. Match the other operator’s speed when possible.
  3. Send complete character rhythms with clean gaps.
  4. Ask for a repeat instead of guessing important information.
  5. Follow the identification, band, power, and operating rules that apply in your country.

You can rehearse common signals in the abbreviations and Q-code reference, then build recognition with the listening trainer.