
Carrier Frequency: The Carrier Frequency is used only for labeling the
Results Graph, and for the calculation of S
y
(f) and (J
y
(r) when the
HP 11729C Down Converter is not being used.
If the Down Converter is defined to be under system control in the
Source Control Diagram, the Carrier Frequency is used to select the proper
HP 11729C band as specified in the System Configuration Table. The
system also determines the correct IF frequency out of the Down Converter
as determined by the Carrier Frequency and HP 11729C band setting.
Detect. Input Frq: This is the input frequency to the phase detector as
defined for the measurement. It is normally the same value as the Carrier
Frequency when a Down Converter is not being used.
If a Down Converter is being used for the measurement, the Detector
Input Frequency is the IF output frequency from the Down Converter.
The Detector Input Frequency determines which phase detector can be
used. At frequencies between 1.2 and 1.6 GHz, either of the internal phase
detectors can be used. If the Detector Input Frequency is <95 MHz, then
the 2 MHz LPF is enabled after the phase detector and the maximum
offset frequency that can be measured is 2 MHz.
Entered K_VCO: This is the VCO Tuning Constant defined for the
measurement in the Instrument Parameter display. The Tuning Constant
must be estimated to within a factor of 2 of the actual value to optimize the
measurement when the HP 3048A is configured to measure the Tuning
Constant.
If the Compute from Expected Tuning Constant calibration method is
selected, the entry must be accurate to within ± 5% (with respect to the
voltage applied to the tune port of the VCO), The VCO tune port input
resistance is accounted for in a separate entry.
Param Summary 3-5
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