2-20
Making Mixer Measurements
High Dynamic Range Swept RF/IF Conversion Loss
High Dynamic Range Swept RF/IF Conversion Loss
The frequency offset mode enables the testing of high dynamic range frequency converters (mixers), by
tuning the analyzer's high dynamic range receiver above or below its source, by a fixed offset. This capability
allows the complete measurement of both pass and reject band mixer characteristics.
The analyzer has a 35 dB dynamic range limitation on measurements made directly with its R (phaselock)
channel. For this reason, the measurement of high dynamic range mixing devices (such as mixers with built
in amplification and filtering) with greater than 35 dB dynamic range must be made on either the analyzer's
A or B channel, with a reference mixer providing input to the analyzer's R channel for phaselock.
This example describes the swept IF conversion loss measurement of a mixer and filter. The output filtering
demonstrates the analyzer's ability to make high dynamic range measurements.
Set Measurement Parameters for the IF Range
Set the following analyzer parameters:
Perform a Power Meter Calibration Over the IF Range
1. Calibrate and zero the power meter.
2. Connect the measurement equipment as shown in Figure 2-16.
CAUTION To prevent connector damage, use an adapter (part number 1250-1462) as a connector saver
for R CHANNEL IN.
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