VSWR Meter or Site Master Tutorial

Introduction

1) after completion of site installation to measure the efficiency of a site or to evaluate the performance of the site against different parameter like “hand-over, interference, call drop, call loss etc”, we perform VSWR measurement.
2) This is a single parameter to check to know how efficient your site is. Only VSWR can show how good your connector is made, how good your feeder cable is installed etc.
3) To measure the VSWR we used “Site Analyzer”. This is digital equipment which is not only gives the reading of VSWR but also tells where the fault is.
4) Site Analyzer is a multi function site management tool designed to help do much more than simply check broken cables or faulty antennas.

The Site Analyzer combines ease-of-use with powerful measurement and data analysis to help perform predictive maintenance.
PC software allows download to PC to analyze data for long-term assessment of system trends, problems, and performance.
We mostly used two types of site analyzer (master):
1. Bird Site Analyzer
2. Anritsu Site Analyzer
Bird Site Analyzer


 About Bird Site Analyzer:
1)You can see the site master which consist of a Display where the VSWR
reading is shown in graphical format, a key board is there to set the values
like frequency band, VSWR limit etc.
2)You will find few buttons like “Calibrate”, ”Config”, ”Mode”, “Marker”.
3) Calibrate is used to caliber the site analyzer before use.
Config is used to set the frequency band, VSWR limit etc.
4) Marker is used to set the marker for graph. We can set to show one marker only or more than one marker, up to 4 markers we can set.
5) Mode is used to select the operating mode e. g. measurement, fault location, power, etc.
6)Arrow button is used for up, down, left, right process whenever required.
7)On right hand side there is ON-OFF push button to turn ON and OFF to the site analyzer.
Calibrate Button:
Firstly you have to “calibrate” site analyzer before use. For this calibration tool is used. This tool has three ports, as
Open
 Short
 Load

 Calibration
To calibrate following process should be done:
1. Switch on the site analyzer
2. Push the calibrate button
3. Fit the open port of calibrate tool to the site analyzer. Push the open button (which you will find at the left hand site). After few second a message will appear “done”. Remove this open port and fit the short port.
4. Push the short button and wait for a while, a message will appear “done”. Remove the short port and fit the load port to the site analyzer.
5. Push the load button and wait for the message “done”.
6. After few second sites analyzer will show “Calibration FULL”.
7. Now site analyzer is ready to use.
Mode Button:
To measure the VSWR, to find the fault location, to set the scale of graph we used this button.
At the top of the site analyzer there is port to attach the cable who’s VSWR has to measure. For this purpose we can use Dummy or jumper cable.

 Process to Measure the VSWR:
1) firstly set the frequency band and VSWR limit.
2) Calibrate the site master.
Now by dummy or jumper cable, attach the cable who’s VSWR has to be measured.
3) Now push the mode button.
On the right hand side on display you will see “measure”, “fault location”, “scale” etc. Chose measure.
4) A graph will appear, with actual value of VSWR. On the bottom you can also see the value of VSWR in the digital format. The marker will show the value. By left, right, up, down arrow you can know the value of VSWR on different distance.
5) For locating fault distance push the mode button and then fault location you will get a graph which will show the distance of maximum loss of the signal
Anritsu Site Analyzer:
Anritsu is the another site master which can also use for VSWR measurement.
The operation of Anritsu is also same as Bird site analyzer.  With the help of Anritsu we can also save reading. The whole process as calibrate, config, measurement are
same.