VSWR Steps

7/29/2019 VSWR Steps

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VSWR TEST

Training & Consultancy Unit

Tariq Ismail

JUNE 25, 2010

This document helps understand the operation of Anritsu Site Master, calibrating a site master, setting GSM900 and DCS 1800 configurations, how to locate and detect a fault. VSWR helps in removing reflection fromfeeder cables, which is very important as TX/RX calibration would be of no effect if high reflections arefound in the table


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2VSWR TEST

ANRITSU Site Master S3310

Operation Manual


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3VSWR TEST

Front Panel

STEPS TO

PERFORM

VSWRTEST

Turn on Site Master by pressing ON/OFF

START

CAL

SAVE

SETUP

MODEFREQ-

DIST

AMPLITU

DEDE

RECAL

SETUP

ESCAPE/CLE

AR

ENTE

R

MARKE

R

Save

Display RECAL

Display

RF Out

Port

ON


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Press Enter to Continue

Press RECALL SETUP and select GSM900 or DCS 1800 accordingly

Move to Level 3 and lock all DRIs of the sector in which sweep test (VSWR) is

required

Procedure to Lock a DRI (assuming DRI 1 0)

Login to BTS through MCUF/H2SC controller card

Type the command chg_l

Type level 2 password and press enter

Type level 3 password and press enter

Type the command lock dri 1 0

When radio status LED of the DRI starts blinking, the DRI is locked

After locking the sector ,remove feeder cable from the respective DRIs DUP

and connect it with RF OUT port of site master

Wait for 10 seconds and graphical display will appear showing the reflection

throughout cable length.

Press MARKER, select M1 and then press EDIT, now u can move the markerthrough the cable length and check reflections at any desired distance

To save a current reflection, press SAVE DISPLAY, save by site name and fault

location for easy access in future

To view a previous display, press RECALL DISPLAY

Calibrating the site Master (OSL)

Site master will show calibration OFF while configuring to GSM 900 or DCS 1800, a

dummy load with open, short and load labeled is used for the site master calibration


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Press START CAL

Connect OPEN to the RF OUT port, it will show success

Now calibrate by connecting SHORT

Finally connect LOAD with RF out port of site master, connect according to

the instruction displayed by screen

GSM 900 & DCS 1800 settings

Press RECALL SETUP, list of already configured setups (If any) will appear

0 H OSL SWR 0.0 - 140.0 m1 H OSL SWR 0.0 - 145.0 m

234 H OSL SWR 1710.00 1880.00

MHZ5 H OSL SWR 880.00 960.00 MHZ678

Steps for GSM 900 configuration

We need to set up three parameters; Frequency, Distance and Amplitude

Press MODE

Select FREQ-SWR and press ENTER

Press F1 and enter lower limit

Example F1 = 830.00 MHZ

Press F2 and enter upper limit

Example F2= 1000.00 MHZ (Now frequencies are set)

Press MODE again

Select DTF-SWR (DTF stands for distance to fault) press ENTER

Press D1 to enter start distance


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D1= 0.0 m

Press D2 to enter end distance (estimate the length of the cable, it

should not be less)

Example D2= 140 m (Now distance is set)

To set up the amplitude, Press AMPLITUDE

Select TOP and enter limit 1.5

Now select BOTTOM and enter 1 (amplitude cannot be lesser than 1)

Finally, to save the settings, press SAVE SETUP

Check your saved settings for GSM 900 by RECALL SETUP

Steps for DCS 1800 configuration

We need to set up three parameters; Frequency, Distance and Amplitude

Press MODE

Select FREQ-SWR and press ENTER

Press F1 and enter lower limit

Example F1 = 1700.00 MHZ

Press F2 and enter upper limit

Example F2= 1900.00 MHZ (Now frequencies are set)

Press MODE again

Select DTF-SWR (DTF stands for distance to fault) press ENTER

Press D1 to enter start distance

D1= 0.0 m

Press D2 to enter end distance (estimate the length of the cable, it

should not be less)

Example D2= 140 m (Now distance is set)


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To set up the amplitude, Press AMPLITUDE

Select TOP and enter limit 1.5

Now select BOTTOM and enter 1 (amplitude cannot be lesser than 1)

Finally, to save the settings, press SAVE SETUP

Check your saved settings for GSM 1800 by RECALL SETUP

VSWR Test is a must before any DRI calibration, it there are reflections in

cable, calibrating that DRI will not be effective

VSWR Steps

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