*Question G2C01:
Which of the following describes full break-in CW operation (QSK)?*  

*Correct Answer is  D: Transmitting stations can receive between code characters and elements*  

### AI Response: (may contain errors)  

Full break-in CW operation, also known as QSK, allows a transmitting station to listen between the individual elements (dits and dahs) and characters of Morse code. This means that the operator can hear incoming signals even while sending, allowing for immediate response to any interruptions or signals from other stations.

1. **Correct Answer: D**  
   - **Explanation**: In full break-in (QSK) operation, the transmitter and receiver switch rapidly between transmit and receive modes. This allows the operator to hear any incoming signals between the Morse code elements they are sending. This capability is particularly useful in situations where quick exchanges or interruptions are necessary.

2. **Why the Other Choices are Incorrect**:
   - **Choice A**: "Breaking stations send the Morse code prosign 'BK'" is incorrect because the prosign "BK" is used to indicate a break in communication, but it is not related to the technical capability of full break-in operation.
   - **Choice B**: "Automatic keyers, instead of hand keys, are used to send Morse code" is incorrect because the use of automatic keyers does not inherently provide full break-in capability. QSK is a feature of the transceiver, not the keying method.
   - **Choice C**: "An operator must activate a manual send/receive switch before and after every transmission" is incorrect because full break-in operation eliminates the need for manual switching. The transceiver automatically handles the switch between transmit and receive.

3. **Useful Rule of Thumb**:
   - Full break-in (QSK) operation is characterized by the ability to receive signals between the smallest elements of Morse code, providing seamless communication and the ability to quickly respond to other operators.