NIRFSA_ATTR_LO_SOURCE
- Updated2025-05-22
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NIRFSA_ATTR_LO_SOURCE
Specific Attribute
| Data type |
Access | High Level Functions |
|---|---|---|
| Vistring | R/W | None |
Description
Specifies the LO signal source used to downconvert the RF input signal. If no signal downconversion is required, this attribute is ignored. If this attribute is set to "" (empty string), NI-RFSA uses the internal LO source.
To use this attribute for the PXIe-5830/5831/5832, you must use the channelName parameter of the niRFSA_SetAttributeViString function to specify the name of the channel you are configuring. You can configure the 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 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 attribute is set to NIRFSA_VAL_LO_SOURCE_SG_SA_SHARED_STR. |
Defined Values:
| NIRFSA_VAL_NONE_STR | Specifies that no LO source is required to downconvert the RF input signal. |
| NIRFSA_VAL_LO_IN_STR ("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. |
| NIRFSA_VAL_ONBOARD_STR ("Onboard") | Specifies that the onboard synthesizer is used to generate the LO signal that downconverts the RF input signal. 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. |
| NIRFSA_VAL_LO_SOURCE_SECONDARY_STR ("Secondary") | Uses the PXIe-5831/5840 internal LO as the LO source. This value is valid on only the PXIe-5831 with PXIe-5653 (LO1 stage only) or PXIe-5832 with PCIe-5653 (LO1 stage only). |
| NIRFSA_VAL_LO_SOURCE_SG_SA_SHARED_STR ("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. |
Default Value: NIRFSA_VAL_ONBOARD_STR ("Onboard")
Supported Devices: PXIe-5644/5645/5646, PXIe-5694, PXIe-5830/5831/5832/5840/5841/5842
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