Device Specific:Vector Signal Transceiver:Signal Path:LO Source Property

NI RF Signal Generators Help (NI-RFSG 18.1)

Edition Date: June 2018
Part Number: 371025V-01
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Short Name: LO Source

Property of niRFSG

Specifies whether to use the internal or external local oscillator (LO) source. If this property is set to "" (empty string), NI-RFSG uses the internal LO source. To set this property, the NI-RFSG device must be in the Configuration state.

Supported Devices: PXIe-5644/5645/5646, PXIe-5840

Default Value: Onboard

Onboard (Onboard)

Uses an internal LO as the LO source. The LO is generated inside the device itself.

PXIe-5840 with PXIe-5653: If the center frequency is greater than or equal to 3.2 GHz, this configuration uses the PXIe-5653 LO source. For frequencies less than 3.2 GHz, this configuration uses the PXIe-5840 internal LO.

LO In (LO_In)

Uses an external LO as the LO source. Connect a signal to the LO IN connector on the device and use the Upconverter Center Frequency (Hz) property to specify the LO frequency.

Secondary (Secondary)

Uses the PXIe-5840 internal LO as the LO source. This value is valid on only the PXIe-5840 with PXIe-5653.


The following table lists the characteristics of this property.

Datatype string
High-level VIs N/A
Channel-based No


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