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The Tracking Generator function allows analysis of:
! Filter Insertion Loss
! Filter Notch Depth
! Filter Pass band
! Filter Bandwidth
The current hookup and COM-120B configuration is as follows:
The Tracking generator (AUX RF OUT) is connected to the Antenna port
therefore the output is looped back around to the input. This is done so
we may now be able to adjust the Tracking generator Output level for a
0 reference on the spectrum analyzer display. This must be done to
accurately measure insertion loss.
To do this, position the cursor to the
Track Gen field and press the ENTER
key to highlight the value. Use the left
and right arrow keys to select either
the 1 or .1 db digits and then use the
Data Scroll Knob to adjust the Tracking
Generator level for a 0 dBm reference
on the Spectrum Analyzer display.
NOTE: The Tracking generator level
will probably not indicate 0 dBm and it
is not necessary for it to be 0 dBm.
After the reference level has been established we will connect the
provided duplexer to evaluate the above mentioned measurements.
Note: The COM-120B has been placed into a unique Split screen mode
of operation for the comprehensive evaluation of this filter.
In Split
screen mode, the COM-120B is essentially operating as two separate
spectrum analyzers allowing one setup to view both the pass band and
the reject band simultaneously.
Rev. 1.0
Page 37
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