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2-8
Making Mixer Measurements (Option 089 Only)
Measurement Considerations
Figure 2-6 Examples of Up Converters and Down Converters
In standard mixer measurements, the input of the mixer is always connected to the
analyzer’s RF source, and the output of the mixer always produces the IF frequencies that
are received by the analyzer’s receiver.
However, the ports labeled RF and IF on most mixers are not consistently connected to the
analyzer’s source and receiver ports, respectively. These mixer ports are switched,
depending on whether a down converter or an up converter measurement is being
performed.
It is important to keep in mind that in the setup diagrams of the frequency offset mode, the
analyzer’s source and receiver ports are labeled according to the mixer port to which they
are connected.
• In a down converter measurement where the softkey is selected,
the notation on the analyzer's setup diagram indicates that the analyzer's source
frequency is labeled RF, connecting to the mixer RF port, and the analyzer's receiver
frequency is labeled IF, connecting to the mixer IF port.
Because the RF frequency can be greater or less than the set LO frequency in this type
of measurement, you can select either or .
DOWN CONVERTER
RF > LO
RF < LO