N E T W O R K A N A L Y Z E R

IO dB

1

FILTER

EXTERNAL

LO SOURCE

pg630e

Figure 3-12.

Connections for a High Dynamic Range Swept IF Conversion Loss Measurement

14.To set the frequency offset mode LO frequency, press:

15.To select the converter type and low-side Lo measurement configuration, press:

In this low-side Lo, down converter measurement, the analyzer’s source frequency range wiII be offset higher than the receiver frequency range. The source frequency range can be determined from the following equation:

receiver frequency range (100 - 1000 MHz) + Lo frequency (1500 MHz) = 1.6-2.5 GHz

16.To view the conversion loss in the best vertical resolution, press:

F’igure 3-13 shows the conversion loss of this low-side Lo, mixer with output filtering. Notice that the dynamic range from the pass baud to the noise floor is welI above the dynamic range limit of the R Channel. If the mixer under test also contained amplification, then this dynamic range would have been even greater due to the conversion gain of the mixer.

Making Mixer Measurements 3-15

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HP 8753E manual Filter External LO Source