Specifies the LO signal source used to downconvert the RF input signal. If this property is set to "" (empty string), NI-RFSA uses the internal LO source.

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).

If no signal downconversion is required, this property is ignored.

Default Value: Onboard

Supported Devices: PXIe-5644/5645/5646, PXIe-5694, PXIe-5830/5831/5832/5840/5841/5842

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
None None

Specifies that no LO source is required to downconvert the RF input signal.
Onboard Onboard

Specifies that the onboard synthesizer is used to generate the LO signal that downconverts the RF input signal.

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

PXIe-5832—This configuration uses the onboard LO of the PXIe-3623, using the LO2 stage.

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

PXIe-5832 with PXIe-5653—This configuration uses the onboard LO of the PXIe-5653 when associated with the PXIe-3623.

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.

LO In LO_In

Specifies that the LO source used to downconvert the RF input signal is connected to the LO IN connector on the front panel.
Secondary Secondary

Uses the PXIe-5831/5840 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-RFSA selects an internal synthesizer and the synthesizer signal is switched to both the RF Out and RF In mixers. This value is valid on only the PXIe-5830/5831/5832/5841 with PXIe-5655, PXIe-5842.