How do you setup the Agilent 8901 for external LO for fc?
How to setup the Agilent 8901B for external LO for fc<300 MHz.
The use of the external LO is sometimes unclear. Let me explain. The external LO can be used at any frequency. We RECOMMEND that an external LO be used for frequencies above 300 MHz because the phase noise of the internal LO of the 8901B is high above 300 MHz. The Agilent 8901B DOES NOT automatically switch to the internal LO below 300 MHz. It also DOES NOT automatically switch to the external LO above 300 MHz. The 8901B defaults to using the internal LO and will not switch to the external LO until told to by the user. The user must configure it to use the external LO when it is needed due to noise considerations. To switch to an external LO at any frequency follow the rocedure titled "Setting Up the LO" in the Agilent 8901B Operation and Calibration Manual.
What is a guaranteed specification for 25 kHz offset noise measurement?
The only guaranteed specifications for the Agilent 8901B opt 030 measurements are the Carrier Power Range, Dynamic Range, Carrier Rejection, Relative Measurement Accuracy, and the Carrier Noise Filter. These specifications are intended to define the instrumentation errors introduced by the 8901B Opt 030 circuitry. We cannot give a guaranteed absolute system measurement specification. The system specification for 8901B Opt 030 is very dependent on the phase noise performance of the LO used for the 8901B. As you are aware this can be either the internal 8901B LO or a user supplied external LO.
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