Acquisition:Advanced:IF Output Frequency Property
- Updated2024-05-08
- 2 minute(s) read
Acquisition:Advanced:IF Output Frequency Property
Short Name: IF Output Frequency
Property of niRFSA
Returns the center frequency of the IF output signal that corresponds to the configured RF center frequency.
The downconverter translates the RF input frequency to the IF output frequency by mixing it with the LO signal. The nominal values for the IF output frequency are shown in the following table.
| Downconverter | Nominal IF Output Frequency |
|---|---|
| PXI-5600 | 15 MHz |
| PXIe-5601 | 53 MHz or 187.5 MHz |
| PXIe-5603 | 187.5 MHz or 199 MHz |
| PXIe-5605 | 187.5 MHz, 190 MHz, or 199 MHz |
| PXIe-5606 | 187.5 MHz, 190 MHz, 199 MHz, 507.5 MHz, or 730 MHz |
| PXIe-5694 | Signal Conditioning Enabled set to Enabled and IF Conditioning Downconversion Enabled set to Disabled: 193.6 MHz; IF Conditioning Downconversion Enabled set to Enabled: 21.4 MHz; Signal Conditioning Enabled set to Bypassed: 162.5 MHz to 212.5 MHz |
The coarse nature of the LO settings can cause the downconverter to be unable to tune to the exact LO frequency that would produce the nominal IF output frequency. Any coercion in the actual LO frequency results in the IF output frequency being slightly off from the nominal value.
Additionally, if you use the Downconverter Center Frequency and LO Frequency properties to program the downconverter, the IF output frequency could vary from the nominal value. NI-RFSA adjusts the acquired spectrum or I/Q data for the difference between nominal and actual IF output frequency. If you use an external digitizer with an RF downconverter, use this property to specify the actual IF output frequency.
Default Value: N/A
Supported Devices: PXI-5600, PXIe-5601/5603/5605/5606 (external digitizer mode), PXI-5661, PXIe-5663/5663E/5665/5667/5668, PXIe-5694
Remarks
The following table lists the characteristics of this property.
| Datatype |  |
| Permissions | Read Only |
| High-level VIs | N/A |
| Channel-based | No |
| Resettable | No |