HP 8712C User Manual

Making Measurements
Measuring Conversion loss
700 MHz
Bandpass Filter
a;-
200
700 900
1100
E,;
MHz MHz MHz
(RF-LO) (RF) (RF+LO)
200
MHz
po650b-c
Figure 3-13. Filtering Out the Unwanted Mixing Product
Inserting a 700 MHz bandpass filter in the measurement setup removes the
unwanted signals at 200 MHz, 900 MHz and 1100 MHz, providing an accurate
measurement of the desired IF signal at 700 MHz.
In the following example, the conversion loss of a mixer will be measured
with RF input frequencies over a 15 MHz span centered at 900 MHz. With an
LO frequency of 200 MHz, the mixer IF frequency will sweep over a 15 MHz
span centered at 700 MHz.
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HP 8712C Specifications

General

Brand	HP
Model	8712C
Category	Measuring Instruments
Language	English