*Question E7E04:
What is one way to produce a single-sideband phone signal?*  

*Correct Answer is  A: Use a balanced modulator followed by a filter*  

### AI Response: (may contain errors)  

To produce a single-sideband (SSB) phone signal, the correct method is:

**Correct Answer: A: Use a balanced modulator followed by a filter**

### Explanation:

1. **Balanced Modulator:**
   - A balanced modulator is used to generate a double-sideband suppressed carrier (DSB-SC) signal. It effectively removes the carrier frequency, leaving only the two sidebands.
   - The output of a balanced modulator contains both the upper and lower sidebands.

2. **Filter:**
   - A filter is then used to remove one of the sidebands, leaving only the desired single sideband (SSB).
   - This process is essential for reducing bandwidth and improving efficiency in communication.

### Why Other Choices Are Incorrect:

- **B: Use a reactance modulator followed by a mixer**
  - A reactance modulator is typically used for frequency modulation (FM), not for generating SSB signals.
  - A mixer is used for frequency conversion, not for sideband suppression.

- **C: Use a loop modulator followed by a mixer**
  - A loop modulator is not a standard method for generating SSB signals.
  - Like the reactance modulator, a mixer is not used for sideband suppression.

- **D: Use a product detector with a DSB signal**
  - A product detector is used for demodulating SSB signals, not for generating them.
  - It is used in the receiver to recover the original audio from an SSB signal.

### Summary:

To generate an SSB signal, the key steps are to first create a DSB-SC signal using a balanced modulator and then use a filter to remove one of the sidebands. This method is efficient and widely used in amateur radio for voice communications.