SSB What is Single Side Band - Introduction to Single Side Band Operating For The New Ham Radio Operator! Rtl-sdr.com - A blog about RTL-SDR and software defined radio. What is I/Q Data? 1. Background on Signals Signal modulation changes a sine wave to encode information. The equation representing a sine wave is as follows: Figure 1: Equation for a Sine Wave The equation above shows that you are limited to making changes to the amplitude, frequency, and phase of a sine wave to encode information. Frequency is simply the rate of change of the phase of a sine wave (frequency is the first derivative of phase), so frequency and phase of the sine wave equation can be collectively referred to as the phase angle.
Figure 2. In the graphic above, the distance from the origin to the black point represents the amplitude (magnitude) of the sine wave, and the angle from the horizontal axis to the line represents the phase. Because phase is a relative measurement, imagine that the phase reference used is a sine wave of frequency equal to the sine wave represented by the amplitude and phase points. Figure 3. Figure 4: I/Q Data in LabVIEW Back to Top 2. Figure 5. Figure 6. Figure 7. 3. 4.
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