3-4 PN: 10580-00343 Rev. H S820E UG
3-3 Return Loss or VSWR MeasurementCable and Antenna Measurements
3-3 Return Loss or VSWR Measurement
Return Loss measures the reflected power of the system in decibels (dB). This
measurement can also be taken in the Standing Wave Ratio (SWR) mode,
which is the ratio of voltage peaks to voltage valleys caused by reflections.
System Return Loss measurement verifies the performance of the
transmission feed line system with the antenna connected at the end of the
transmission line. Figure 3-2 and Figure 3-3 show a sample antenna
measured using Return Loss and using VSWR.
Device Under Test: Feed line with Antenna
1. Press the Measurement main menu key, under the Standard submenu,
select Return Loss or VSWR.
2. Press the Freq/Dist main menu key and enter the start and stop
frequencies.
3. Press the Amplitude main menu key and enter the top and bottom
values for the display or press Fullscale.
4. Press the Calibration main menu key and perform a calibration of the
instrument. Anritsu suggests using a phase-stable test port cable. See
Chapter 4 for details.
5. Connect the Site Master to the Device Under Test using the calibrated
phase-stable test port cable.
6. Press the Marker main menu key and set the appropriate markers as
described in “Markers” on page 3-40.
7. Press the Limit main menu key to enter and set the limit line as
described in “Limit Lines” on page 3-34.
8. Press File (7) then Save to save the measurement to memory. Refer to
Chapter 10 for details on setting the save location.
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