Test Tools; Vswr; Vswr Test Function; Scope Of Vswr Test - Viavi AVX-10K Operation Manual

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
Rev. 002
22135254 VIAVI
AVX-10K Operation
2022-08-25
Page 110 of 139