Local Oscillators

The local oscillators (LO) provide the signals required for mixing in the upconversion process. The LOs are phase-locked to the onboard reference OCXO at all times. The LOs cannot lock to external reference directly; only the OCXO locks directly to external references. Access the final LO signal from the front panel SMA connector labeled LOCAL OSC OUT 0 by enabling signal export using the Local Oscillator Out 0 Enabled property or the NIRFSG_ATTR_LOCAL_OSCILLATOR_OUT_0_ENABLED attribute. The frequency of this LO can vary between 3.2 and 5.9 GHz, depending upon the specified output frequency and intermediate frequency automatically chosen by NI-RFSG.