Device Specific:Vector Signal Transceiver:Signal Path:LO PLL Fractional Mode Enabled 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 PLL Fractional Mode Enabled

Property of niRFSG

Specifies whether to use fractional mode for the local oscillator (LO) phase-locked loop (PLL). This property enables or disables fractional frequency tuning in the LO. Fractional mode provides a finer frequency step resolution and allows smaller values for the LO Frequency Step Size property. However, fractional mode may introduce non-harmonic spurs.

This property is valid only if you set the LO Source property to Onboard.

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

Default Value: Enabled

Related Topics

Refer to the local oscillators topic appropriate to your device for more information about using fractional mode.

Disabled (0)

Disables fractional mode for the LO PLL.

Enabled (1)

Enables fractional mode for the LO PLL.


The following table lists the characteristics of this property.

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


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