mf003503 rf apparatus usage——site master

8/13/2019 MF003503 RF Apparatus UsageSite Master

1/19

HUAWEI TECHNOLOGIES CO., LTD. All rights reserved

Internal

www.huawei.com

MF003503 RF Apparatus Usage

Site Master

ISSUE1.0


2/19

HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 2

After learning this course, you will grasp the following:

The method for testing the standing wave ratio (SWR) with

the Site Master

The method for locating faults with the

Site Master


3/19


Chapter 1 Overview

Chapter 2 Method of Testing the SWR

Chapter 3 Location of the Antenna Faults

Chapter 4 Precautions and FAQs


4/19


Chapter 1 Overview

Basic function

SWR/ return loss (RL) test

Connector loss (CL) test

Digital trunk frame (DTF)

Frequency range S330A700-3300 MHz

S331A25-3300 MHz

Test range

SWR 1.00-65.00

RL 0.00-54.00 dB

CL 0.00-20.00 dB

Maximum input power: 22 dBm (about 156 mW)


5/19


Chapter 1 Overview

Standard accessories

An N open and short circuit unit and N 50 ohm load

Some new devices are configures with a three-way unit used as open and short

circuit unit and load

An N-N cable and an N-DIN cable

For the convenience of test, you should prepare some conversion connectors.

A 12.5-15 VDC charger


6/19


Chapter 1 Overview

Common keys ON/OFFSwitch

START CALStart calibration

ENTERExecution

RUN/HOLDStart and end of scanning

ESCAPE/CLEAR

Escape the current status

Clear the display

UP/DOWN: Select the menu to:

Increase or decrease the parameter value.

Adjust the display contrast.

AUTOSCALEadjusts the best display.


7/19HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 7

Chapter 1 Overview





8/19


Chapter 2 Method of Testing the SWR Procedure1: Select the test index and set the initial parameters

Select the test project.

Select OPTfrom the main menu.

Press B1and UP/DOWNto select the project to be test. Then press ENTERtoconfirm the selection.

PressESCAPEto return to the main menu.

Select the frequency range in the test.

Select FREQfrom the main menu.The sub-menu appears.

PressF1and enter the start frequency of the scanning with the numeric keys.

PressF2and enter the end frequency of the scanning with the numeric keys.


Select the unit of measure. (This procedure can be skipped when using the default

value.) Select OPTfrom the main menu and pressMORE.

PressB5to select the unit of measure, and then press ENTERto confirm theselection.The default unit is METRIC.



9/19



Procedure 2: Calibrate

This procedure must be performed before any tests. Step 1: Press START CAL to activate the calibration menu.

The following information is displayed:

PERFORM CALIBRATION

CANCEL

CAL A909-915 MHz

CAL B: 935-960 MHz

Step 2: Select A or B with the up/ down arrow key and ENTER.

A and B can both be selected. You do not need to pay attention to the frequencyafter the CAL A or CAL B. The frequency is in the frequency range after thecalibration.

The Connect OPEN, PRESS ENTERis displayed.

Step 3: Connect the open circuit unit to the TEST PORT and press ENTER.

The Connect SHORT, PRESS ENTERis displayed.

Step 4: Connect the short circuit unit to the TEST PORT and press ENTER.

The Connect LOAD, PRESS ENTERis displayed.

Step 5: Connect the load to the TEST PORT and press ENTER.

The system calculates according to the test result and calibrate automatically.


10/19



Procedure 3: Test the SWR.

Step 1: Connect the device to be test with the test cable.

The test can begin from the test of the top jumper port or the super flexible cable port.

Step 2: The system starts the test automatically by default.

If the system does not test automatically, you can press RUN/HOLDto start the test.

The device tests the selected frequency range once for one press.

Step 3: Adjust the display scale of the test result.

You can press AUTO SCALEto make the system adjust the display scale automatically.

You can select SCALEfrom the main menu and enter the values of the TOP, BOTTOMandLIMIT.

Step 4: Read the data of the test maximum SWR.

Press MKRS(marked with MAKERS) in the FREQmenu to open an MKRS.

Select EDITand change the value of the corresponding MKRS frequency with the up/down arrow key. Then read

the maximum SWR value in the test range.

Press MOREin the FREQmenu and select PEAK. The MKRS skips to the frequency of the maximum SWR

value.

Note: If the test frequency range is larger than that needs to be test, for example, the actual test range is 900 M-1000 M

and the range needs to be test is 935 M-960 M, you should use the maximum SWR value in the test range that needs to

be test. You can set the first two MKRSs and marks the high and low frequency in the range that needs to be test, and

then set the third MKRS to read the maximum SWR value in the required frequency range as the test result.


11/19


Chapter 1 Overview

Chapter 2 Method of testing the SWR




12/19


Chapter 3 Location of the Antenna Faults When the SWR is larger than the set index (1.5 generally), the DTF function should be used to

locate the problem.

Procedure 1: Set the initial parameters. (Maximum distance, center frequency and cable type)

Select DISTfrom the main menu and press DTF AID.

Enter the value of D2(the maximum distance and it is set to the distance to the antenna

generally), and then press ENTER.

Enter the value of Center Freq, and then pressENTER to confirm the input.

The value is set to the medium value of the test frequencies. Press DOWN and select the types of cables.

The system displays the other parameters of the cable automatically.

There are three cables:

FSJ450B: The 1/2 inch jumper

LDF550A: The 7/8 inch feeder

LDF650A : The 5/4 inch feeder You should select the most widely used cable in the feeder system. The cable should be the

feeder generally.

You should use the 1/2 inch jumper in the following conditions:

The distance between the small base station and the antenna is less than 10 m.

The GPS antenna is connected to the device directly with the 1/2 inch jumper.


13/19



Procedure 2: Calibrate. (The procedure is the same as the previous one.)

Procedure 3: Start the DTF test.

Step 1: The system starts the test automatically by default.

If the system does not start the test, you can press DISTto start the test.

Step 2: PressMKRSto open an MARKER.

Step 3: Check the antenna feeder system according to the read distance.

You can reselect the D1 and D2 according to the value D. For example,

D1D1 m, D2D1 mand then test to locate the problem.

If there is a connector, the connector may be not fastened, rough or

watered.

If there is an SWR peak in the non-connector place, the cable has faults,

such as a break.


14/19


Chapter 1 Overview





15/19



The device connection

when there is the tower

mounted amplifier (TMA)

When there is the TMA,

the test of the antenna

feeder is performedwhen the CDU has

power. (The TMA

needs the CDU to

supply +12 VDC

power)

To ensure the device

security, you should

add the DC prevented

module, as show in the

figure.

Do not connect the connectors of the Site

Master and antenna inversely. Or else, the

Site Master can be blown down.

Splitter

RXIN

Antenna

analyser

TMA

Receiving

antenna

SITE MASTER

Female N plug

Connects the receiving

antenna terminal at the

top of the BTS cabinet

SMAConnects the IN terminal

of the splitter Connects the antenna

analyser

Female N plug


16/19


Chapter 4 Precautions and FAQs Frequency selection

The test frequency range should not be too large. Or else, the test accuracy may

be affected.

If the base station is ETS450D, you should select the S331A (test range: 25-

3300 MHZ) instead of S330A (test range: 700-3300 MHZ).

If the antenna feeder is too large, the requirements of the SWR are strict.

The SWR test of the Site Master is a small signal test: A small power signal is

sent to the antenna feeder system to test the signal echo. All the indexes arecalculated according to the transmit power and the echo power got from the

test.

If the antenna feeder is too long, the attenuation of the signal sent by the Site

Master is large in the antenna system and the echo is small. Thus, the

calculated SWR is smaller than the actual one. In the actual situation, the

transmit power of the base station (40 W) is larger than that of the Site Master.If the SWR of the antenna system is large, the standing wave alarm occurs and

the device even can be damaged.

To avoid the defect of the Site Master, the index of the SWR should be strict

when the antenna feeder is long. For example, the SWR cannot be larger than

1.4.


17/19



FAQs

Question 1: The SWR of the antenna system with different distances are shown

during the DTF operation. Can we use the DTF function to test the SWR?

No, the SWR in the DTF test is not the actual one. The peak only means

there may be problems in the peak. It is a bug of the Site Master software.

Question 2: The screen does not display sometimes.

It is not the fault of the device. The operator set the display contrast to 0that

leads to the problem.

Solution: Switch off, and then switch on. Do not press any keys. Press the

up arrow key to increase the display contrast.

Question 3: Press START CALand the calibration operation cannot be

performed sometimes.

Solution: PressESCAPEseveral times, and then press START CAL.


18/19



FAQs

Question 4: How to set the system to perform the SWR test continuously?

Select OPTfrom the main menu.

Press B4and select SINGLE SWP ONor SINGLE SWP OFFto start or

end the continuous test. Then press ENTERto confirm the selection.

Press ESCAPEto return to the main menu.

Question 5: The test frequency range changes after entering the maximum

distance and central frequency during the DTF test. Are there any problems?

No, the device is designed in such a way.

When the frequency range is increased largely during the DTF test, you

should reset the frequency range and calibrate, and then test the SWR

instead of changing only the frequency range, such as from 100 M-1000

M to 890 M-960 M, and then getting the test result. Or else, the test result

is not accurate.


19/19

Thank You

www.huawei.com

mf003503 rf apparatus usage——site master

Documents