Signal Path:LO Frequency Property

Signal Path:LO Frequency Property

Short Name: LO Frequency

Property of niRFSA

Specifies the LO signal frequency for the configured center frequency.

If you are using the vector signal analyzer with an external LO, use this property to specify the LO frequency that the external LO source passes into the LO IN or LO1 IN connector on the RF downconverter front panel. If you are using an external LO, reading the value of this property after configuring the rest of the parameters returns the LO frequency needed by the device.

Set this property to the actual LO frequency because NI-RFSA corrects for any difference between expected and actual LO frequencies.

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).

Default Value:

PXIe-5694: 215 MHz

All other devices: 0

Supported Devices: PXIe-5601/5603/5605/5606 (external digitizer mode), PXIe-5644/5645/5646, PXIe-5663/5663E/5665/5667/5668, PXIe-5694, PXIe-5830/5831/5832/5840/5841/5842

Related Topics

PXIe-5830 Frequency and Bandwidth Configuration

PXIe-5831/5832 Frequency and Bandwidth Configuration

PXIe-5841 Frequency and Bandwidth Configuration

Remarks

The following table lists the characteristics of this property.

Datatype
Permissions	Read/Write
High-level VIs	N/A
Channel-based	Yes
Resettable	Yes