*Question G2E09:
How do you join a contact between two stations using the PACTOR protocol?*  

*Correct Answer is  C: Joining an existing contact is not possible, PACTOR connections are limited to two stations*  

### AI Response: (may contain errors)  

In the context of the PACTOR protocol, the correct answer is:

**C: Joining an existing contact is not possible, PACTOR connections are limited to two stations**

### Explanation:

1. **Why the correct answer is correct:**
   - PACTOR is a digital mode used primarily for error-free data transmission. It is designed to establish a connection between exactly two stations, similar to a telephone call. This ensures a reliable and private communication link, which is why joining an existing contact is not possible.

2. **Why the other choices are incorrect:**
   - **A: Send broadcast packets containing your call sign while in MONITOR mode**
     - This option is incorrect because PACTOR does not support broadcasting to join an existing connection. MONITOR mode allows you to listen to PACTOR traffic, but it does not enable you to join an ongoing session.
   - **B: Transmit a steady carrier until the PACTOR protocol times out and disconnects**
     - This is incorrect because transmitting a steady carrier would not cause the PACTOR protocol to time out or disconnect. It would likely cause interference but not allow you to join a session.
   - **D: Send a NAK code**
     - Sending a NAK (Negative Acknowledgment) code is used to indicate that a packet was not received correctly, not to join a session. It is part of error correction, not session management.

### Key Points:
- PACTOR connections are strictly one-to-one.
- The protocol is designed for private, reliable communication between two stations.
- Attempting to join an existing PACTOR session is not supported by the protocol.