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Document Part No. E5500-90024Ed. 1.0
Figure 7-20 Oscilloscope Display of a Beatnote out of the Agilent 70420A
Monitor Port
1
Estimate the system's capture range (using the VCO source
parameters entered for this measurement). The estimated VCO
tuning constant must be accurate within a factor of 2. A
procedure for Estimating the Tuning Constant is located in this
chapter.
NOTE: If you are able to locate the beatnote, but it distorts and then
disappears as you adjust it towards 0 Hz, your sources are injection
locking to each other. Set the beatnote to the lowest frequency
possible before injection locking occurs and then refer to Minimizing
Injection Locking in the Problem Solving section of this chapter for
recommended actions.
E5500 Phase Noise Measurement System Version A.02.00
Absolute Measurement Examples
Free-Running RF Oscillator
7
7-29
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