GSM+DCS 20dBm Mini Repeater User's Manual

WR-18910/20A/BW(8.3+20)Q(955.85+1835)IFMN

GSM&DCS 100mW Wide Band Repeater

USER’S MANUAL

SUNNADA COMMUNICATIONS

June, 2010

1

PREFACE

This manual gives an introduction of Dualband Pico Repeater (GSM DCS) which

states the system’s installation, usage, functions, operation and maintenance.

Because the system will upgrade continuously, the introduction or statement in this

manual may be different from the actually used version. If there is any change of

this manual’s parameters, model or dimension, we would not inform again..

Notes on Abbreviations:

RF Radio Frequency

TX/RX Transmitter/Receiver

ANT Antenna

UL Uplink

DL Downlink

1

INDEX

Chapter One - Safety ............................................................................................................................................ 1

1.1 Safety Instruction .................................................................................................................................... 1

1.2 Electrostatic Protection ........................................................................................................................... 1

Chapter Two - Introduction ................................................................................................................................ 2

Chapter Three - Working Principle .................................................................................................................... 3

3.1 Modulation Mode ................................................................................................................................... 3

3.2 Illustration of the Framework ............................................................................................................... 3

3.3 Equipment Photos .................................................................................................................................. 3

3.4 Illustration for the Repeater’s System .................................................................................................. 4

3.5 Technical Specification ........................................................................................................................... 4

3.5.1 Frequency ...................................................................................................................................... 6

3.5.2 Operating Temperature .............................................................................................................. 6

3.5.3 Operating Relativity Humidity Range ...................................................................................... 6

Chapter Four - Location Selection ...................................................................................................................... 7

4.1 Requirements for Signal Receiving in terms of Location Selection.................................................. 7

4.1.1 Calculation of Receiving Field Intensity ................................................................................... 7

4.1.2 Signal Requirements for Repeater Installation ........................................................................ 8

4.2 Principle for Repeater’s Location Selection ......................................................................................... 8

4.2.1 Environment ................................................................................................................................. 8

4.2.2 Antenna ......................................................................................................................................... 9

4.2.3 Other factors ................................................................................................................................. 9

4.2.4 Place unsuitable for location....................................................................................................... 9

4.3 The Place Relation between Donor Antenna and Service Antenna ................................................. 9

4.4 Site Information ..................................................................................................................................... 10

Chapter Five - Repeater’s Installation Instruction ......................................................................................... 11

5.1 Instrument for Repeater Installation .................................................................................................. 11

5.2 The Main Matching Materials for Repeater Installation .................................................................. 11

Chapter Six - Repeater System Installation ..................................................................................................... 12

6.1 Power Supply ........................................................................................................................................ 12

6.2 Antenna Installation ............................................................................................................................. 12

6.3 Repeater Installation ............................................................................................................................. 12

2

6.3.1 Repeater Port .............................................................................................................................. 12

6.3.2 Illustration for Repeater’s Main Equipment Workmanship ................................................ 13

6.4 Feeder Installation ................................................................................................................................ 14

6.5 Power Cable Connection...................................................................................................................... 15

6.6 Power Connection ................................................................................................................................. 15

Chapter Seven - Repeater Debugging .............................................................................................................. 16

7.1 Handle Appearance .............................................................................................................................. 16

7.2 Description of Key-press ...................................................................................................................... 16

7.3 Handle Protocol Type Selection .......................................................................................................... 17

7.4 Menu Structure ..................................................................................................................................... 17

7.4.1 Main menu .................................................................................................................................. 17

7.4.2 Sub menu structure .................................................................................................................... 17

7.5 Debugging Step ..................................................................................................................................... 18

Chapter Eight - Maintenance ............................................................................................................................ 21

GSM&DCS 20dBm MN WB Repeater User’s Manual

1

Chapter One - Safety

1.1 Safety Instruction

Before install and operate our systems, please read this safety instruction very

carefully, and obey following safety notice:

1) To ensure the proper functioning of this equipment, switching on equipment

without connecting to antenna or load is strictly prohibited. And it’s required

that the VSWR of the load which connecting to equipment, like antenna, must

be less than 1.5, otherwise it will result in the damage of equipment internal

module after a long term usage;

2) Grounding: every set of this equipment has a grounding terminal for lightning

protection. When install this equipment, please make sure yellow green wire is

well connected to building grounding, yellow green wire could be replaced by

grounding braided wire; antenna, feeder must be connected to grounding

terminal.

3) Power supply: this equipment is suitable for AC100~240V. Make sure the

power supply voltage range is AC100~240V, rated frequency range is 45 ~ 55

Hz. And the electric outlet used for this equipment must be well connected to

building grounding.

4) Anti electric shock: it’s dangerous to touch the internal power supply module,

and hot-line operation is strictly prohibited..

1.2 Electrostatic Protection

Try not to touch PCB and component conductor with clothes or hands. If must,

electrostatic protection is required, like wearing electrostatic protection glove or

using electrostatic bag. Because electrostatic might damage components.


2

Chapter Two - Introduction

With the development of modern cellular telecommunication, people’s work and

life is becoming faster and faster. The requirement for telecommunication service is

also improved. Satisfying customer everywhere has become a leading trend for this

industry, especially in wireless communication area. 5W (Whoever, whenever,

wherever, whomever and whatever) standardization is imperative. Since the RF

signal’s transferable traits and obstacle caused by artificial and natural objects, blind

area and weak signal area, such as cellar, inside part of building, block gulfed by

high-rise buildings, remote area and so on, is easy to appear. In these areas, it is

very possible to get low connection rate, jammed roam, sudden disconnection even

total disconnection and so on, which will cause lots of inconvenience for users.

In order to solve the signal coverage problems in the above-mentioned areas, our

company independently developed the GSM&DCS 20dBm Mini Repeater, which

gives a brilliant solution to the above problems. The product is suitable for the

cantonal area, suburb, foot of mountains and the place where the BS’s signal is hard

to reach. The repeater amplifies the uplink and downlink signal between base

station and use’s mobile phone in a duplex way by using duplexer so that the base

station’s signal coverage area is enhanced remarkable and the blind area is cleaned.


3

Chapter Three - Working Principle

The BS downlink signal enters the BS side duplexer after space transmission. After

the low noise amplifier and attenuator, the downlink signal will be amplified to

some certain power and transmitted to MS side service antenna through MS side

duplexer. Up till now, the coverage of downlink signal has finished. The theory of

uplink cable line is similar with the downlink cable line..

3.1 Modulation Mode

The modulation mode is GSM/DCS.

3.2 Illustration of the Framework

Fig. 1 Illustration for Repeater’s Framework

3.3 Equipment Photos

(Please find below)

Filter

Du

plex

er

Du

plex

er

Filter

BS MS

LNA PA

LNAPA


4

Fig. 2 Equipment Internal

Fig. 3 Power supply and RF ports

3.4 Illustration for the Repeater’s System

Fig. 4 Illustration for the System

3.5 Technical Specification

(Please find below)


5

Testing Items Specifications

Uplink Downlink

Frequency Range (MHz) GSM: 906.7~915

DCS:1730~1750

GSM: 951.7~960

DCS: 1825~1845

Frequency stability (ppm) ≤ 0.01

Max. Output Power (dBm) 15 20

Gain (dB) 60 60

ATT Adjustable Range (dB)/ Step

1dB 0~30 @ 1 dB step

ATT Adjustable

Error (dB)

1 ~ 10 ≤|±1.0| ≤|±1.0|

11 ~ 20 ≤|±1.0| ≤|±1.0|

21 ~ 30 ≤|±1.5| ≤|±1.5|

ALC (dB) ≥ 20

Noise Figure (dB) ≤7.0 ≤7.0

Ripple In Band

(P-P) (dB)

GSM ≤8 ≤8

DCS ≤10 ≤10

Input Power

Threshold (dBm)

GSM 0 0

DCS 0 0

VSWR ≤1.8 ≤1.8

Time Delay (us) ≤5 ≤ 5

Out of Band Gain

（dB)

± 400KHz < 55 < 55

± 600KHz < 50 < 50

± 1MHz < 35 < 35

± 5MHz <25 <25

RF Connector SMA(f)

Input / output Impedance（Ω） 50

Power Supply AC220V

Power consumption (W) ≤ 50

Temperature Range () -10 ~ +40


6

Humidity Range (%) 5～95

MTBF (hr) > 50000

Weight (Kg) ≤9.5

Dimension (mm) 275×210×62

Housing class IP53

Monitor & Alarm Handle and MODEM

3.5.1 Frequency

Downlink: GSM: 951.7~960 DCS: 1825~1845;

Uplink: GSM: 906.7~915 DCS: 1730~1750

3.5.2 Operating Temperature

-10~+40

3.5.3 Operating Relativity Humidity Range

≤ 95%


7

Chapter Four - Location Selection

As an co-frequency transmitting equipment, wireless repeater receives BS’s forward

signals and transmits it to the mobile station in blind areas. And it also receives

mobile station’s reverse signals and transmits it to BS at the same time. Therefore,

there is a isolation problem, that is, the output signal of service antenna will be

received by the donor antenna, and this relays on the isolation of antennas. In other

words, the antenna isolation refers to the space attenuation of signals from

repeater’s one port to another port, including the gain of donor antenna and service

antenna. In the application of wireless repeater, suitable isolation is not fixed but

related to repeater’s gain. If the antenna’s isolation is bigger than the repeater’s gain

and amounts to a fixed number, the service signal of service antenna received by

the donor antenna will be less and less and when it is less than the intensity of

donor antenna’s receiving signals, the repeater’s self-excitement will not happen;

contrariwise, self-excitement will happen and thus exerts influence on base station.

From those explanations, it is clear that repeater’s using gain is determined by the

antenna’s isolation, and the isolation indirectly decides whether the repeater can

reach the maximum output power or not, and thus influence the repeater’s

coverage range. In addition, after the installation of repeater, isolation is changeable

according to the outside circumstances. So it is required that the isolation between

donor antenna and service antenna must be 15dB more than repeater’s total gain, or

repeater’s self-excitement will take place. The landform of installation place has

great influence on the isolation, therefore, the repeater’s location selection is of great

importance in repeater project. This topic will be discussed in detailed as follows.

4.1 Requirements for Signal Receiving in terms of Location

Selection

4.1.1 Calculation of Receiving Field Intensity

The following formula is used to calculate the free space’s attenuation:

Lo=32.45 + 20lgf + 20lgd

In this formula, “f” stands for “frequency”, the unit of which is MHz; “d” stands for

“distance”, the unit of which is Km.


8

Okumura Hata model could be used when more accurate consideration is needed:

Lm=69.55 + 26.16lgf -13.82lghb - a(hm) + [44.9 - 6.55lghb] lgd

In this formula, hm is the height of mobile station’s antenna. As for as the mobile

phone users are concerned, a(hm)=0. hb is the height of base station’s antenna.

4.1.2 Signal Requirements for Repeater Installation

1) BCCH signal field intensity of the donor base station (mobile phone testing)

Rxmin > - 53dBm

2) Rxmin=Pmax – Gmax - Gant

Rxmin: Minimum field intensity of donor BS BCCH in the installation place.

Pmax: Repeater’s max. output power,+20dBm

Gmax: Repeater’s max. gain, 60dB.

Gant : Donor antenna’s gain, 13dBi.

Rxmin= +20dBm-60dB-13dB= -53dBm

Only if the signal level tested is more than-53dBm, will the repeater work at full

capacity. If the signal level is less than-53dBm, the repeater won’t be able to work at

full capacity and the coverage area will be affected.

4.2 Principle for Repeater’s Location Selection

4.2.1 Environment

When wireless repeater is applied outdoors, the location should be selected in the

area between donor BS and blind area.(See Fig. 5)so as to avoid the condition of a

less than 90 degree angle between donor antenna and service antenna，especially

when these two antennas are in the same direction(See Fig. 6).

Fig. 5 Fig. 6


9

4.2.2 Antenna

When wireless repeater is applied outside ， because the service antenna is

directional antenna, the repeater is preferable to be located outside the blind area

and close to the edge of blind area, (about 200---500m) (See Fig. 7). If the repeater is

installed inside blind area (see Fig. 8), the best coverage effect cannot be realized.

Fig. 7 Fig. 8

4.2.3 Other factors

Other factors should be taken into consideration when selecting the repeater’s

location:

1) The service antenna’s location had better to be the apogee and there should be

no obstacles in front of them;

2) Most of the areas can be viewed by men’s eyes;

3) The repeater should be located in the BS sector where the call drop rate is low,

the call volume is small and the signal is steady;

4) There must be steady power supply near the location. The grounding net is

also required; equipment’s security;

4.2.4 Place unsuitable for location

The place where the signal’s field intensity is less than<-63dBm.

4.3 The Place Relation between Donor Antenna and Service

Antenna

Avoiding the case that making the two antennas emit in opposite direction but the

line connecting antennas is vertical to the line connecting base station and blind

area. Because it has been proved that under such condition, the requirement that

the repeater’s gain should be 15dB less than isolation is hard to meet only by

increasing the distance.


10

4.4 Site Information

Name

Model Model

DL Input Power(dBm) UL Input Power(dBm)

DL Using Gain (dB) UL Using Gain (dB)

DL Output Power(dBm) UL Output Power(dBm)

Table 1 Site Information List


11

Chapter Five - Repeater’s Installation Instruction

5.1 Instrument for Repeater Installation

Instrument Function

Electrician Knife Power connecting

Cable Knife Feeder connector making

Inclined Mouth Screw Feeder connector making

19-21 Spanner Feeder connector fixing

Sinker Main equipment

Electric Drill Main equipment

Cross Screwdriver Main equipment

8mm Wrench Fasten SMA Port

Spectrum Analyzer (800 to 2200 MHz) System operation checking

30 dB Coupler (800 to 2200 MHz) For spectrum analysis

Multimeter For voltage and current testing

Table 2 Instruments for Installation (not Supplied)

5.2 The Main Matching Materials for Repeater Installation

No Material Application Quantity Remarks

1 Indoor Antenna System On Demand

2 Outdoor Antenna System 1

3 1/2 Coaxial Feeder System On Demand

4 1/2 Feeder Connector System On Demand

5 Cable Ties System On Demand

6 2.5 mm2 Power Cable System Supply On Demand

7 Power Socket

(more than 5 holes) System Supply On Demand

8 Power Adapter System 1 Supplied

9 M4 Plastic Bolt System 4 Supplied

10 M4*40 Bolt System 4 Supplied

11 M4 Flat Mat System 4 Supplied

Table 3 Material Needed for System Installation (not supplied unless stated)


12

Chapter Six - Repeater System Installation

6.1 Power Supply

AC100-240V, 45~55Hz

6.2 Antenna Installation

Straighten the antenna pole and install the bracket to the antenna according to the

instruction, then rivet the donor antenna to the pole;

Indoor antenna is adopted as service antenna. Please refer to the installation

illustration in the antenna packing for the installation steps.

Note 1: the pole height of donor antenna should be made according to the actual

installation condition;

Note 2: the antenna bracket should be fastened with donor antenna first and then

installed to the pole mount.

6.3 Repeater Installation

6.3.1 Repeater Port

Fig. 9 MS Port Distribution of the Equipment

MS Power Handle


13

Fig. 10 BS Port Distribution of the Equipment

6.3.2 Illustration for Repeater’s Main Equipment Workmanship

Fig. 11 Illustration for Installation

a. Using electric drill to drill 4 holes on the wall according to Fig. 11’s illustration;

b. Putting the matched four plastic bolts into the holes respectively;

c. Putting four bolts to the main equipment and installation completed.

Notes: The repeater should be installed in the indoor place where the air flow is

good and condition is dry. The distance between the ground and the repeater

should be more than 1m. Repeater’s flank should be away from wall more than

0.1m.

BS


14

6.4 Feeder Installation

Step 1: Feeder Connector Making

Step 2: Clear the copper scraps on connector, and get waterproof measure done

when join the feeder to the antenna, and use self-blend tape first and then use

insulating tape.

Step 3: The deployment of feeder should be tidy, and across, skew and crack is not

allowed.

Step 4: Feeder should be fixed with cable ties, feeder sockets or cabling ladder and

feeder nip. The fixed distance is as follows:

<1/2” Feeder >1/2” Feeder

When the feeder goes in a horizontal way: 1.0 m 1.5 m

When the feeder goes in a vertical way: 0.8 m 1.0 m

Table 4 Illustration for Feeder Distance


15

Step 5: Pay attention to the length of the feeder and avoid unnecessary bend.

Step 6: Use labels to indicate the start-point and end-point of every feeder.

Step 7: Never tie the feeder to the arrester of building.

6.5 Power Cable Connection

1) The supplying end is connected according to the customer demand. If the

customer demands to install the ammeter, then we need to do it. Before the

connection, all the power should be cut off. Utilize 2.5mm² dual-core rubber

sheathed cable. Connect the red cable to the fire cable, connect the black to the

zero cable, and connect the yellow-white cable to the grounding cable.

2) The power cable and the grounding cable should be in different line, the fixed

distance is 0.3M. The power cable can’t be pressed, and the connection point

should be fastness and insulated.

6.6 Power Connection

Check the voltage by use of the multimeter before connecting the power and the

stable voltage should be in the range of AC100~240V.


16

Chapter Seven - Repeater Debugging

7.1 Handle Appearance

Fig. 12 Appearance of the handle

7.2 Description of Key-press

A. “+” Key:

under the editing status, it means that value will increase “1”; under the menu

switching status, it means switching to the “previous” menu.

B. “-” Key:

under the editing state, it means that value will decrease “1”; under the menu

switching status, it means switching to the “next” menu.

C. “Enter” Key:

if the menu is not the last menu, it will enter the next menu; if it is the last menu, it

will switch to editing state; if it is editing state, it will exit the editing state.

D. “Esc” Key:

if the menu is not on the top, it will return to the previous one

E. “Tab” Key:

under the editing state, it will move the cursor, and changes the variant;

F. “Ext” Key:

reserved.


17

7.3 Handle Protocol Type Selection

When handle is connected with mini repeater, it will search the matching protocol

type automatic, and it will take about 2~3 seconds. Handle is connected successfully

if TXD and RXD indicators are alternate blinking. If not, need to manual select the

matching protocol type.

7.4 Menu Structure

7.4.1 Main menu

7.4.2 Sub menu structure

1) Protocol: supported repeater types; adjustable

Protocol

G/C for GSM repeater and CDMA repeaters

D/W for DCS repeater and WCDMA repeaters

GDW for GSM,DCS,WCDMA tri-band repeater or

GSM,DCS dualband repeater

Note: This handle will select suitable protocol automatically when it’s

connected to the repeater.

2) Channel: work channel; adjustable

Channel Channel 1 For Channel 1 configuration

Channel 2 For Channel 2 configuration

Note: Because the communication between handle and repeater will take some

time, so if the handle operation is too fast, maybe some operation could not be

executed. So, it’s suggested that do the other operations about 1 second after

Press Enter.


18

3) PA Switch: adjustable

PA Switch

PA Switch UL 1 For GSM Uplink PA switch

PA Switch DL 1 For GSM Downlink PA switch

PA Switch UL 2 For DCS Uplink PA switch

PA Switch DL 2 For DCS Downlink PA switch

PA Switch UL 3 N/A

PA Switch DL 3 N/A

4) ATT: Attenuation adjust;

ATT

ATT UL1 GSM Uplink Attenuation adjust, adjust range 0 ~ 31

ATT DL1 GSM Downlink Attenuation adjust, adjust range 0 ~

31

ATT UL2 DCS Uplink Attenuation adjust, adjust range 0 ~ 31

ATT DL2 DCS Downlink Attenuation adjust, adjust range 0 ~

31

ATT UL3 N/A

ATT DL3 N/A

5) Temperature: work temperature; Read only

Temperature Repeater temperature Inquiring temperature

Note: when repeater is not connected with handle, temperature is showed as 0.

6) Power: Uplink/downlink output power; Read only

Power

Output Power UL1: 0dBm GSM Uplink Output Power (default

value: -8dBm)

Output Power DL1: 0dBm GSM Downlink Output Power (default

value: -8dBm)

Output Power UL2: 0dBm DCS Uplink Output Power (default value:

-8dBm)

Output Power DL2: 0dBm DCS Downlink Output Power (default

value: -8dBm)

Output Power UL3: 0dBm N/A

Output Power DL3: 0dBm N/A

7.5 Debugging Step

Step 1. Test the input power of the equipment by way of spectrum tester.


19

A. Connect the spectrum tester and turn on it;

B. Set the central frequency among 935 ~ 960MHz, 20MHz bandwidth,

300KHz/30KHz RBW/VBW;

C. Connect the spectrum analyzer to the input port of mini repeater, and

then switch on mini repeater;

D. Read the input signal intensity.

Step 2. DL ATT Adjust

A. Press “Esc” to return to the main menu;

B. Press “+” or “-” to choose “ATT” and press “Enter”;

C. Press “+” or “-” to choose “ATT DL1” and press “Enter”;

D. Press “+” or “-” to set its value;

Note 1): When the output power is “20dBm”, it can meet the coverage

requirement. If the receiving signal (DL) is “-30dBm”, the total DL gain is

“60dB”, then the downlink ATT can be set as “10dB” according to

60-20-(-30) =10dB.

Note 2): The DL ATT should be set according to the specific output

power requirements and input signal status..

Step 3. UL ATT Adjust

A. Press “Esc” to return to “ATT”;

B. Press “+”or “-” and choose “ATT UL1” and press “Enter”;

C. Press “+”or“-”to set its value;

D. Press “Enter” to finish the setting.

Note : In order to avoid self-excitement, the using gain of DL should be

15dB less than the system isolation degree when adjusting the ATT (DL).

If self-excitement does exist, the signal wave will appear waveform

distortion. Therefore, the attenuation value should increase until the

waveform become normal.

Step 4. Power Inquiry

A. Press “Return” key on the monitoring panel to return to the main menu;

B. Press “ + “ or “ - “ key to choose “Power” and press “Enter”;

C. Press “ + “ or “ - “ key to choose “Output Power UL1” to inquire uplink

output power;


20

D. Press “Return” and choose “Output Power DL1” to inquire downlink

output power;


21

Chapter Eight - Maintenance

Malfunction

Phenomenon Quick-search Methods and Steps

The Equipment doesn’t

Work

Have a check on AC (220V, 50~60Hz). Regulators could be added if

necessary.

Weak Signal in Coverage

Area

1. Whether the receiving field intensity turns weak.

2. Have a check whether the UL output power is stable. If there is no

problem with the output power, then check the cable line between the

UL output port and antenna.

3. Whether the power works.

Good Signal with High

Transmission Power

If making a call at high place has the same effect with that in the

situation of closing repeater, then that is the BS’s problem.

Table 5 Malfunction Obviation List

Documents

GSM+DCS 20dBm Mini Repeater User's Manual