Range: -312.5 MHz to +312.5 MHz, System
Dependent
Default: 0 Hz
Move the center of the noise bandwidth relative to the carrier. This allows the notch to be in the center of the noise bandwidth without the carrier leakage. Image tones may be visible in the notch of an uncorrected signal but these are much easier to suppress.
The Noise Bandwidth must be less than the maximum available bandwidth to be able to offset it. The noise offset frequency resolution is determined by the tone spacing.
Frequency – Manually set the Noise Offset when generating multiple signals for use in a sequence. Other wise the noise signal will appear to change frequencies about the carrier.
IQ Skew – Use to minimize images.
IQ Gain Balance – Use to minimize images.
Here is the same NPR signal except the Noise Offset is -3.7 MHz. The carrier has been moved out of the notch. The pedestals in the notch and on the right side of the noise signal are caused by images. In this case the IQ Skew parameter was adjusted to exaggerate the images.
