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.

To use this property for the PXIe-5830/5831/5832 and PXIe-5842 VST with 54 GHz Frequency Extension, you must first use the Active Channel property to specify the name of the channel you are configuring. You can configure LO1 and LO2 channels by using lo1 or lo2 as the channel string, or set the channel string to lo1,lo2 to configure both channels. For all other devices, the only valid value for the channel string is "" (empty string).

Note For the PXIe-5841 with PXIe-5655, RF list mode is not supported when this property is set to SG SA Shared.
Note For any PXIe-5842 instrument without frequency extension (i.e. no RMM-5585 remote measurement module connected), the only valid value for the channel string is "" (empty string).

Supported Devices: PXIe-5644/5645/5646, PXIe-5830/5831/5832/5840/5841/5842

Default Value: Onboard

Related Topics

PXIe-5830 LO Sharing Using NI-RFSA and NI-RFSG

PXIe-5831/5832 LO Sharing Using NI-RFSA and NI-RFSG

Remarks

The following table lists the characteristics of this property.

Short Name LO Source
Data type cstr.png
Permissions Read/Write
High-level VIs N/A
Channel-based Yes
Resettable Yes
Onboard Onboard

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

PXIe-5831/5832—This configuration uses the onboard LO of the PXIe-3622, using the LO2 stage.

PXIe-5831/5832 with PXIe-5653—This configuration uses the onboard LO of the PXIe-5653 when associated with the PXIe-3622.

PXIe-5841 with PXIe-5655—This configuration uses the onboard LO of the PXIe-5655.

PXIe-5842—This configuration uses the onboard LO of the PXIe-5655. Cables between modules are required as shown in the Getting Started Guide for the instrument.
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-5831 internal LO as the LO source. This value is valid on only the PXIe-5831/5832 with PXIe-5653 (LO1 stage only).
SG SA Shared SG_SA_Shared

Uses the same internal LO during NI-RFSA and NI-RFSG sessions. NI-RFSG selects an internal synthesizer and the synthesizer signal is switched to both the RF In and RF Out mixers. This value is valid on only the PXIe-5830/5831/5832/5841 with PXIe-5655/5842.
Automatic SG SA Shared Automatic_SG_SA_Shared

NI-RFSG internally makes the configuration to share the LO between NI-RFSA and NI-RFSG. This value is valid only on the PXIe-5820/5830/5831/5832/5840/5841/5842.