AVX-10K Operation
Rev. 002
2022-08-25
22135254
VIAVI
Page
110
of
139
9.
Test Tools
9.1. VSWR
9.1.1.
VSWR Test Function
The VSWR test function provides users with the ability to troubleshoot potential cabling and / or
antenna issues.
•
Voltage Standing Wave Ratio (VSWR)
is a measurement that represents how well an antenna's
impedance is matched to the radio or transmission line to which it is connected.
The smaller the VSWR measurement, the better the antenna and transmission line match, and
therefore less loss and better signal strength on the transmission line. The minimum VSWR is
1.0, which means no power is being reflected
•
Return loss (RL)
is the ratio of the reflected signal to the transmitted signal. A low return loss
indicates less signal reflection and better signal strength. A high return loss indicates more signal
reflection and less signal strength, indicating an issue along the transmission line.
When Return Loss is selected, measurements are displayed in dB.
9.1.2.
Scope of VSWR Test
This test is used to evaluate how well an antenna's impedance matches the impedance of the radio or
transmission line to which it is connected.
9.1.3.
UUT Parameters/Characteristics
The example in this section assumes the following UUT (Unit Under Test) characteristics and settings.
You will need to adjust settings according to the operational capabilities of the device you are testing.
In this case, we will be showing a test of a Transponder antenna.
Frequency Range Settings: 900 to 1250 MHz
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