Specifies whether to allow NI-RFSG to select the upconverter frequency offset. You can either set an offset yourself or let NI-RFSG select one for you.

Placing the upconverter center frequency outside the bandwidth of your waveform can help avoid issues such as LO leakage.

To set an offset yourself, set this property to Automatic or User-Defined and set either the Upconverter Center Frequency or the Upconverter Frequency Offset properties.

To allow NI-RFSG to automatically select the upconverter frequency offset, set this property to Automatic or Enabled and set the Signal Bandwidth property to describe the bandwidth of your waveform. The signal bandwidth must be no greater than half the value of the Device Instantaneous Bandwidth property, minus a device-specific guard band. Do not set the Upconverter Center Frequency or Upconverter Frequency Offset properties. If all conditions are met, NI-RFSG places the upconverter center frequency outside the signal bandwidth. Set this property to Enabled if you want to receive an error any time NI-RFSG is unable to apply automatic offset.

When you set an offset yourself or do not use an offset, the reference frequency for gain is near the upconverter center frequency, and Upconverter Frequency Offset Mode returns User-Defined. When NI-RFSG automatically sets an offset, the reference frequency for gain is near the RF frequency, and Upconverter Frequency Offset Mode returns Enabled. Refer to the specifications document for your device for more information about gain, flatness, and reference frequencies.

Note Below 120 MHz, the PXIe-5841 does not use an LO and Enabled is unavailable. Refer to the PXIe-5841 Automatic Frequency Offset topic for more information about using an automatic offset with an external LO.

Supported Devices: PXIe-5830/5831/5832/5841/5842

Default Value: Automatic

Related Topics

PXIe-5830 Automatic Frequency Offset

PXIe-5831/5832 Automatic Frequency Offset

PXIe-5841 Automatic Frequency Offset

Remarks

The following table lists the characteristics of this property.

Short Name Upconverter Frequency Offset Mode
Data type ci32.png
Permissions Read/Write
High-level VIs N/A
Channel-based Yes
Resettable Yes
Automatic -1

NI-RFSG places the upconverter center frequency outside of the signal bandwidth if the Signal Bandwidth property has been set and can be avoided.
Enabled 1

NI-RFSG places the upconverter center frequency outside of the signal bandwidth if the Signal Bandwidth property has been set and can be avoided. NI-RFSG returns an error if the Signal Bandwidth property has not been set, or if the signal bandwidth is too large.
User-Defined 5001

NI-RFSG uses the offset that you specified with the Upconverter Frequency Offset or Upconverter Center Frequency properties.