*Question G4A12:
Which of the following is a common use of the dual-VFO feature on a transceiver?*  

*Correct Answer is  C: To transmit on one frequency and listen on another*  

### AI Response: (may contain errors)  

The dual-VFO (Variable Frequency Oscillator) feature on a transceiver allows for more flexible operation, particularly in the context of monitoring and communication.

### Correct Answer: C - To transmit on one frequency and listen on another

- **Explanation**: The dual-VFO feature enables a user to set one VFO to a transmitting frequency and the other to a receiving frequency. This allows the operator to transmit on one frequency while simultaneously monitoring another frequency, which is particularly useful for listening to a net or a different station while still being able to respond or communicate.

### Why the Other Choices are Incorrect:

- **A: To allow transmitting on two frequencies at once**  
  - This is incorrect because most transceivers cannot transmit on two frequencies simultaneously. The dual-VFO feature is designed for monitoring and not for simultaneous transmission.

- **B: To permit full duplex operation -- that is, transmitting and receiving at the same time**  
  - While full duplex operation is a feature of some advanced transceivers, the dual-VFO feature itself does not inherently allow for full duplex. It is primarily for switching between frequencies rather than simultaneous operation.

- **D: To improve frequency accuracy by allowing variable frequency output (VFO) operation**  
  - This is misleading. While VFOs can help in tuning and adjusting frequencies, the primary purpose of dual-VFO is not to improve accuracy but to facilitate monitoring and communication on different frequencies.

### Summary

The dual-VFO feature is primarily used for:

- **Transmitting on one frequency** while **listening on another** (Choice C).

This capability enhances operational flexibility, especially in busy bands or during contests. Understanding the specific functions of your equipment can greatly improve your effectiveness as an amateur radio operator.