*Question G2E01:
Which mode is normally used when sending RTTY signals via AFSK with an SSB transmitter?*  

*Correct Answer is  D: LSB*  

### AI Response: (may contain errors)  

To understand which mode is normally used when sending RTTY signals via AFSK with an SSB transmitter, let's break down the options:

### Correct Answer: LSB (Lower Sideband)

1. **Why LSB is Correct:**
   - RTTY (Radio Teletype) signals are typically transmitted using AFSK (Audio Frequency Shift Keying), which modulates the audio tones onto a carrier wave.
   - When using an SSB transmitter, the standard practice for RTTY is to use LSB. This is because LSB is the preferred mode for most digital modes, including RTTY, on the HF bands. It allows for better compatibility with the frequency shifts used in RTTY.

### Why the Other Choices are Incorrect:

2. **A: USB (Upper Sideband)**
   - While USB is used for many voice communications, it is not the standard for RTTY. Using USB could lead to incorrect frequency shifts and miscommunication in RTTY signals.

3. **B: DSB (Double Sideband)**
   - DSB is not commonly used for RTTY. It transmits both upper and lower sidebands, which is inefficient for digital modes like RTTY that require clear tone separation.

4. **C: CW (Continuous Wave)**
   - CW is a mode used for Morse code transmission, not for RTTY. RTTY requires specific audio tones that CW does not provide.

### Summary:
- RTTY signals via AFSK are best transmitted using LSB due to compatibility and standard practices in digital communications.
- USB, DSB, and CW do not align with the requirements for effective RTTY transmission.

This understanding will help you remember the correct mode for RTTY and why the other options are not suitable.