*Question G7C02:
What output is produced by a balanced modulator?*  

*Correct Answer is  D: Double-sideband modulated RF*  

### AI Response: (may contain errors)  

A balanced modulator is a device used in radio communications to combine a carrier signal with an audio or data signal to produce a modulated output. Here's how it works and why the correct answer is D:

1. **Correct Answer: D - Double-sideband modulated RF**
   - A balanced modulator takes an input carrier signal and an input audio or data signal and produces an output that contains both the upper and lower sidebands of the modulated signal, but suppresses the original carrier. This is known as double-sideband suppressed carrier (DSB-SC) modulation.
   - The output consists of two sidebands, which are mirror images of each other around the suppressed carrier frequency.

2. **Why the Other Choices are Incorrect:**
   - **A: Frequency modulated RF**
     - Frequency modulation (FM) involves varying the frequency of the carrier signal in accordance with the modulating signal. A balanced modulator does not perform frequency modulation; it performs amplitude modulation without the carrier.
   - **B: Audio with equalized frequency response**
     - A balanced modulator does not output audio signals. It modulates an RF carrier with an audio or data signal, resulting in an RF output.
   - **C: Audio extracted from the modulation signal**
     - The purpose of a balanced modulator is not to extract audio but to combine it with a carrier to produce a modulated RF signal. Audio extraction is typically done in demodulation processes, not modulation.

In summary, a balanced modulator is specifically designed to produce a double-sideband modulated RF signal by combining a carrier with a modulating signal and suppressing the carrier itself. This is why the correct answer is D.