Agilent Technologies 8719D User Manual page 171

Figure 3-30. Example Mixer RF Feedthrough Measurement
You can measure the IF to RF isolation in a similar manner, but with the following
modifications:
Use the analyzer source as the IF signal drive.
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View the leakage signal at the RF port.
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M a k i n g M i x e r M e a s u r e m e n t s ( O p t i o n