Acquisition:Advanced:Downconverter Center Frequency Property

Acquisition:Advanced:Downconverter Center Frequency Property

Short Name: Downconverter Center Frequency

Property of niRFSA

Enables in-band retuning and specifies the current frequency, in Hz, of the RF downconverter. If you set this property, any measurements outside the instantaneous bandwidth of the device are invalid. To disable in-band retuning, reset the property or call the niRFSA Reset VI.

After you set this property, the RF downconverter is locked to that frequency until the value is changed or the property is reset. Locking the downconverter to a fixed value allows frequencies within the instantaneous bandwidth of the downconverter to be measured with minimal overhead, decreasing tuning time.

Valid Values: Any supported tuning frequency of the device

PXIe-5820: The only valid value for this property is 0 Hz.

Default Value:

PXIe-5694: The default value for the PXIe-5694 is 193.6 MHz unless you set the Signal Conditioning Enabled property to Bypassed, in which case the default value is 187.5 MHz.

All other devices: The carrier frequency or spectrum center frequency. NI-RFSA sets this property to the default value based on the value of the Acquisition Type property.

Supported Devices: PXIe-5601/5603/5605/5606 (external digitizer mode), PXIe-5644/5645/5646, PXIe-5663/5663E/5665/5667/5668, PXIe-5694, PXIe-5820/5830/5831/5832/5840/5841/5842

Remarks

The following table lists the characteristics of this property.

Datatype
Permissions	Read/Write
High-level VIs	N/A
Channel-based	No
Resettable	Yes