Device Specific:Vector Signal Transceiver:Signal Path:LO Frequency Step Size (Hz) 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 Frequency Step Size (Hz)

Property of niRFSG

Specifies the step size for tuning the local oscillator (LO) phase-locked loop (PLL).

When the LO PLL Fractional Mode Enabled property is set to Enabled, the specified step size affects the fractional spur performance of the device. When the LO PLL Fractional Mode Enabled property is set to Disabled, the specified step size affects the phase noise performance of the device.

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

Default Value: 200 kHz

The valid values for this property depend on the LO PLL Fractional Mode Enabled property. If you set the LO PLL Fractional Mode Enabled property to Disabled, the specified value is coerced to the nearest valid value.

LO PLL Fractional Mode Enabled Property Setting LO Frequency Step Size Property Valid Values on PXIe-5644/5645 LO Frequency Step Size Property Valid Values on PXIe-5646 LO Frequency Step Size Property Valid Values on PXIe-5840
Enabled 50 kHz to 24 MHz 50 kHz to 25 MHz 50 kHz to 100 MHz
Disabled 4 MHz, 5 MHz, 6 MHz, 12 MHz, or 24 MHz 2 MHz, 5 MHz, 10 MHz, or 25 MHz 1 MHz, 5 MHz, 10 MHz, 25 MHz, 50 MHz, or 100 MHz

Remarks

The following table lists the characteristics of this property.

Datatype fD
PermissionsRead/Write
High-level VIs N/A
Channel-based No
ResettableYes

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