*Question T8B08:
What is meant by the statement that a satellite is operating in U/V mode?*  

*Correct Answer is  B: The satellite uplink is in the 70 centimeter band and the downlink is in the 2 meter band*  

### AI Response: (may contain errors)  

The statement that a satellite is operating in U/V mode refers to the frequency bands used for communication between the satellite and ground stations. 

### Correct Answer Explanation:
- **Correct Answer: B**: The satellite uplink is in the 70 centimeter band and the downlink is in the 2 meter band.
  - **Uplink**: This is the frequency used to send signals from the ground station to the satellite. In U/V mode, the uplink is typically in the 70 cm band (430-450 MHz).
  - **Downlink**: This is the frequency used to receive signals from the satellite to the ground station. In U/V mode, the downlink is in the 2 meter band (144-148 MHz).
  
This configuration allows for effective communication, as the two bands are sufficiently separated to avoid interference.

### Incorrect Answer Explanations:
- **Choice A**: The satellite uplink is in the 15 meter band and the downlink is in the 10 meter band.
  - This is incorrect because the 15 meter band (21 MHz) and 10 meter band (28 MHz) are not typically used for satellite communication in the U/V mode.
  
- **Choice C**: The satellite operates using ultraviolet frequencies.
  - This is incorrect as it refers to a completely different part of the electromagnetic spectrum. U/V mode specifically refers to UHF (Ultra High Frequency) and VHF (Very High Frequency) bands used for radio communication, not ultraviolet frequencies.
  
- **Choice D**: The satellite frequencies are usually variable.
  - While some satellites may have variable frequencies, U/V mode specifically refers to fixed frequency bands (70 cm for uplink and 2 m for downlink). This choice does not accurately describe the U/V mode.

### Summary:
- U/V mode is defined by specific frequency bands: 
  - Uplink: 70 cm (430-450 MHz)
  - Downlink: 2 m (144-148 MHz)

Understanding these frequency allocations is crucial for effective satellite communication and is a key concept for the Extra Class exam.