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Figure 4-3 is an example of a typical transmission line cable loss trace.
Procedure - Return Loss Mode
Step 1. Press the
MODE key.
Step 2.
Select FREQ-RETURN LOSS using the Up/Down arrow key and press
ENTER.
Step 3. Set the start and stop frequencies, F1 and F2, as described on page 3-2.
Step 4. Connect the Test Port Extension cable to the RF port and calibrate the Site Mas-
ter as described on page 3-2.
Step 5. Save the calibration set up (page 3-7).
Step 6. Connect the Device Under Test to the Site Master phase stable Test Port Exten-
sion cable. A trace will be displayed on the screen as long as the Site Master is
in sweep mode.
Step 7.
Press the
AMPLITUDE key and set TOP and BOTTOM values of the display.
In the example below, the TOP is set to 4, and the BOTTOM is set to 10.
Step 8. Press the
MARKER key.
Step 9.
Set M1 to MARKER TO PEAK.
Step 10.
Set M2 to MARKER TO VALLEY.
Step 11. Calculate the insertion loss by averaging M1 (marker to peak) and M2 (marker
to valley) and dividing by two as follows:
Insertion Loss
MM
=
+12
2
2
Step 12. Press
SAVE DISPLAY (page 3-8) name the trace, and press ENTER.
4-6
Chapter 4 Cable & Antenna Measurements
Figure 4-3. Typical Transmission Line Cable Loss Trace