To Select IQ Modulation
Press Mod Type IQ to enable IQ modulation function.
When Mod is enabled, Sweep or Burst will be disabled automatically (if
enabled currently).
After IQ is enabled, the instrument will generate IQ modulated waveform with
the currently specified carrier and modulating waveform.
To Select Carrier Waveform Shape
The carrier waveform shape for IQ modulation could only be Sine waveform. To select
Sine waveform, press the front panel key Sine.
To Select Modulating Waveform Source
Press Mod Source to select “Int” or “Ext” modulating waveform source.
1. Internal Source
After the “internal” source is selected, the generator outputs IQ modulation
waveform according to the current configuration (Pattern, Rate, and IQ_Map).
As shown in the following figure, “Rate” is the transmission rate of the code, “Pat”
is the currently selected code pattern, and “IQ Map” is the method used to convert
a digital signal into an analog signal. The generator operates using the code
pattern in “Pat” and the specified method in “IQ Map” to acquire two modulating
signals, I and Q.
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