*Question T1D04:
[97.113(a)(4), 97.113(c)] Under what conditions is an amateur station authorized to transmit music using a phone emission?*  

*Correct Answer is  A: When incidental to an authorized retransmission of manned spacecraft communications*  

### AI Response: (may contain errors)  

To understand the conditions under which an amateur station is authorized to transmit music using a phone emission, we need to look at the relevant regulations.

### Correct Answer: A
**Why the correct answer is correct:**
- Amateur stations are allowed to transmit music only when it is incidental to an authorized retransmission of manned spacecraft communications. This means that if you are relaying communications from a spacecraft, any music that is part of that transmission is permissible. This is a specific exception in the rules that allows for music to be transmitted in a very limited context.

### Why the other choices are incorrect:
- **B: When the music produces no spurious emissions**
  - This is incorrect because the presence of spurious emissions does not grant permission to transmit music. The regulations do not allow music transmission based solely on the quality of the signal.

- **C: When transmissions are limited to less than three minutes per hour**
  - This is incorrect as there is no provision in the amateur radio rules that allows music transmission based on time limits. The rules are strict about music transmission, allowing it only in specific circumstances, not based on duration.

- **D: When the music is transmitted above 1280 MHz**
  - This is incorrect because the frequency band does not change the rules regarding music transmission. The regulations apply regardless of frequency, and music transmission is not allowed unless it meets the specific criteria mentioned in answer A.

### Summary
- Amateur stations can transmit music only when it is incidental to authorized retransmissions of manned spacecraft communications.
- Other options do not align with the regulations governing amateur radio operations.

This understanding is crucial for the Extra Class exam, as it highlights the specific conditions under which certain transmissions are permitted.