RfsaAdvancedAcquisition.DownconverterFrequencyOffsetMode Property

public RfsaDownconverterFrequencyOffsetMode DownconverterFrequencyOffsetMode { get; set; }

Public Property DownconverterFrequencyOffsetMode As RfsaDownconverterFrequencyOffsetMode
	Get
	Set

Property Value

Placing the downconverter center frequency outside the bandwidth of your input signal can help avoid issues such as LO leakage.

To set an offset yourself, set this property to Automatic or UserDefined and set either the DownconverterCenterFrequency or the DownconverterFrequencyOffset properties.

To allow NI-RFSA to automatically select the downconverter frequency offset, set this property to Automatic or Enabled and set the SignalBandwidth property to describe your expected input signal. The signal bandwidth must be no greater than half the specified value of the DeviceInstantaneousBandwidth property, minus a device-specific guard band. Do not set the DownconverterCenterFrequency or the DownconverterFrequencyOffset properties. If all conditions are met, NI-RFSA places the downconverter center frequency outside the signal bandwidth if there is sufficient room in the device instantaneous bandwidth to do so. Set this property to Enabled if you want to receive an error any time NI-RFSA is unable to apply automatic offset.

When you set an offset yourself or do not use an offset, the reference frequency for gain is near the downconverter center frequency, and offset mode reads back as UserDefined. When NI-RFSA automatically sets an offset, the reference frequency for gain is the I/Q carrier frequency, and offset mode reads back as Enabled. Refer to the specifications document for your device for more information about gain, flatness, and reference frequencies.

Reference