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Next Generation  
Signal Enhancement 

 

There should be adequate vertical & horizontal separation 
between the DONOR & SERVER antennas to avoid interference 
and noise. 

 

 

     Separation can be determined by the mathematical formulas:

 

Vertical Separation: 

    Isolation (dB) = 28 + 40 log (D/

ʎ

 in m)   

Horizontal Separation: 

      

  Isolation (dB) = 22 + 20 log (D/

ʎ

 in m) – (Gain of   donor antenna 

+ gain of server antenna)   

D-Distance between donor & server antennas in m  

ʎ

- wavelength in m

 

The following table is an approximate guide to antenna 
separation.  
The use of highly directional antennas with good front to back 
ratios can help to reduce isolation requirements.  

 

VERTICAL ANTENNA 

SEPARATION 

HORIZONTAL ANTENNA 

SEPARATION 

Separation (m.)

 

Isolation (dB)

 

Separation (m.)

 

Isolation (dB)

 

5 75.0  5  45.5 

10 87.1 10 51.7 
20 99.1 50 65.5 
30 106.2  100  71.5 
40 111.2  150  75.1 
50 115.0  250  77.6 

Vertical and Horizontal Antenna Separation @ 900 MHz 

 
The antenna separation table demonstrates that vertical separation yields 
better results than horizontal separation. However, when desired isolation 
cannot be met due to insufficient separation, external shielding can help; for 
example, mounting the antennas on either side of a rooftop penthouse or 
using some type of grounded metal screen or wire mesh (so called chicken 
wire) between antennas.  
 
The following example illustrates the various signal levels and antenna 
gains needed to form a properly functioning repeater system.  

 

Received Signal Level 

-72 

dBm 

Donor Antenna gain 

12 

dBi 

Cable loss (100 ft. of 7/8 inch) 

dB 

Input to Repeater 

-62 

dBm 

Gain of Repeater set 

80 

dB 

Output of Repeater 

+18 

dBm 

Cable loss (100 ft. of 7/8 inch) 

dB 

Server Antenna Gain  

9

 dBi 

Repeater ERP 

+26 

dBm 

 

Summary of Contents for R4-30-SMR800

Page 1: ... ec ct ti iv ve e R Re ep pe ea at te er r Single Sub Band Repeater For Indoor Applications FCC ID S3CR4 30 S8 Proprietary Information The information contained herein is proprietary to Shyam Telecom Limited Unauthorized access copy and replication are prohibited This document must not be copied in whole or part by any means or it shall not be disclosed or divulged to any third Party without the p...

Page 2: ... 6 1 General 11 6 2 Terminal Set up 11 6 3 Block Diagram Description 7 R4 Repeater Specifications 21 7 1 Electrical Specifications RF 21 7 2 Electrical Specification Power Requirement 21 7 3 External Electrical Interface 21 7 4 Mechanical Specification 21 7 5 Environmental Specification 22 7 6 Contents of Delivery 22 8 Installation 23 8 1 Preparation Sheet Pre Installation 23 8 2 Engineering Consi...

Page 3: ...installed with lighting protection Damage to internal modules as a result of lightning is not covered by the warranty 3 Safety Instructions and Warnings 3 1 Personnel Safety Before installing or replacing any equipment the entire manual should be read and understood The user needs to supply the appropriate AC power to the Repeater Incorrect AC power settings can damage the repeater and may cause i...

Page 4: ...e body of user or near by person The donor antenna used for this transmitter must be fixed mounted on outdoor permanent structures with a separation distance of at least 1 5 meters from all persons during normal operation The RF electric performance of the repeater conforms to FCC requirement of the inter modulation and spurious emission It avoids interference problems 3 3 Electrostatic Sensitivit...

Page 5: ...om Limited Page 5 34 Next Generation Signal Enhancement unpacking and otherwise handling the Repeater follow ESD precautionary procedures including the use of grounded wrist straps grounded workbench surfaces and grounded floor mats ...

Page 6: ...Configuration Monitoring Console software CMB Combiner Unit CSEL Channel Selective DCS Digital Communication System DL Downlink signal from base station via repeater to mobile station EGSM Extended Global System for Mobile Communication ETSI European Telecommunications Standard Institute GSM Global System for Mobile communication LAC Location Area Code of the BTS site LED Light Emitting Diode LNA ...

Page 7: ...adversely affects the RF signal strength The user views repeaters as a means to extend base station coverage so as to reduce the number of base stations and thereby accelerate network availability Repeater systems are installed after meticulous planning between BTSs and the mobile users to provide RF coverage in the shadowed regions Repeater systems are available for different applications and ult...

Page 8: ...nd is subject to this FCC Application w FCC ID S3CR4 30 S8 The repeater adopts duplex mode and bi directional amplification for U L D L signals between the base station and mobile users It has been designed for outdoor applications to meet the requirements of large number of users in the targeted area It conforms to ETSI standards safety requirements The system can be incorporated with optional Re...

Page 9: ...transmit receive directions Supervisory module A metallic case houses the repeater Arrangement is made for heat dissipation especially for amplifiers which generate more heat The choice of suitable metal as the case material gives a lightweight design with good heat conduction The housing is not waterproof since it is to be used for indoor application Figure 1 Indoor Coverage Typical Application C...

Page 10: ...All Rights Reserved Shyam Telecom Limited Page 10 34 Next Generation Signal Enhancement Figure 2 Indoor Coverage In a Office Premises Ceiling Antenna R4 30 SMR800 ...

Page 11: ...order to perform configuration as per requirement It also enables monitoring the status Configuration of parameters can be carried out locally with the help of laptop PC connected to the repeater by means of local USB serial interface or remotely via wireless modem Optional mounted inside the repeater The laptop PC should be loaded with the CMC software available on the supplied CD along with the ...

Page 12: ...rs User can login for configuration monitoring of repeater parameters START command is for initiating the dialogue SET command is for updating the repeater parameters Information as detailed below is configured after the CONFIGURATION window is activated i Repeater ID User can assign a unique repeater ID to each repeater installed Up to 10 characters are allowed in this field ii Repeater Location ...

Page 13: ... Upper range can be set from 35 to 55dBm Lower range can be set from 75 to 95dBm vi PA On Off User can set uplink and or downlink PA as ON or OFF independently for testing maintenance purpose at the time of installation for both the bands After completing the installation it must be in ON condition only vii Attenuation This field is specified with the attenuation inserted in the system both in the...

Page 14: ...ameters Conditions Remarks 1 Start and Stop Frequency of sub band equipped The specified frequency bands in DL UL are displayed 2 RSSI DL for the Band Real time DL signal level is indicated 3 RSSI UL for the Band Real time UL signal level is indicated 4 Attenuation DL Indicates attenuation inserted in the system in DL path 5 Attenuation UL Indicates attenuation inserted in the system in UL path 6 ...

Page 15: ...paths 3 PA Power Low DL When PA Power in DL path goes below the set limit is indicated through the alarm 4 PA Power High DL When PA Power in DL path exceeds the upper limit is indicated through the alarm 5 DL PA Temperature High When PA Temperature in DL path exceeds limit alarm is generated 6 UL PA Temperature High When PA Temperature in UL path exceeds limit alarm is generated 7 LNA Alarm The al...

Page 16: ...user computer COM Port and repeater s USB port are connected directly using cable Sequence is as under Click the COMM on the command bar to display the COMMUNICATION window Select the Connection Type as LOCAL Select the computer s Comm Port where the repeater is connected Click OK b REMOTE CONNECTION In this type of connection User communicates from to remote location with the repeater using wirel...

Page 17: ...ng this facility SMS Service Center Number RMS Phone Number Maintenance Phone Number VII Security Settings Figure 8 The system has two levels of permitting Log in to the repeater to avoid unauthorized operation The levels are ADMINISTRATOR SUPERVISOR Each level has a specific password The password for each level can be changed at intervals ADMINISTRATOR has rights to perform all functions Viz Conf...

Page 18: ...All Rights Reserved Shyam Telecom Limited Page 18 34 Next Generation Signal Enhancement Figure 7 Instant Alarms by SMS Figure 8 Security Settings ...

Page 19: ... receive path Two duplexer units are provided in the repeater one in the Donor antenna side and other in the server antenna side Each duplexer transfers receives signals from respective antenna for further connectivity to low noise amplifier The bandwidth of the duplex filter depends on the operator s frequency band 25MHz 15MHz 10MHz 9MHz or full Band etc c Low Noise Amplifier LNA This module is p...

Page 20: ...his objective USB interface Wireless modem Optional Remote controlling function of repeater can be achieved by inserting Wireless modem This arrangement also enables status of repeaters at different locations to be monitored g POWER SUPPLY The power supply unit incorporated in the repeater is of high efficiency and reliability Different DC voltages required for the operation of electronic circuitr...

Page 21: ...nt in DL UL 31 dB in 1 dB step Software control 9 Gain flatness over band 2 dB 10 Gain variation with temperature 1 5 dB 11 Total delay in the signal path direction 5 5 microseconds 12 Noise figure 5 dB Max 13 Impedance 50 Ohms 14 Return loss 16 dB 15 RMS interface Wireless modem optional USB port 7 2 Electrical Specification Power Requirement Parameters Specified Limits Input AC Voltage Range 100...

Page 22: ... to 550 C 230 F to 1310 F Storage Temperature 300 C to 750 C 220 F to 1670 F Enclosure As per Indoor Application 7 6 Contents of Delivery ITEMS QUANTITY Repeater R4 1 PC interface cable for USB port 1 Power cable 3 pin 3 meter length 1 Operation Installation manual 1 CD containing the application software 1 Wireless Modem Optional 1 Mounting Clamps with Nuts bolts 1 set ...

Page 23: ...ailable at site where donor antenna is to be installed 2 Estimated cable loss from donor antenna to the repeater unit 3 Estimated DL RF power to the input to the repeater 4 Desired RF Power in DL 5 Proposed gain settings in DL path 7 Attenuator to be inserted in DL path 8 Estimated cable loss from repeater unit to server antenna port 9 ERP at server antenna 10 Desired RF Power in UL 11 Proposed ga...

Page 24: ...of AC mains for operation of the system Sites where repeater unit is installed should be easily accessible for the maintenance team b Antenna Selection and Placement Proper selection of the repeater s donor and server antennas is crucial in designing the repeater system Appropriate antenna characteristics help to provide proper isolation between the server coverage and donor antennas which helps t...

Page 25: ...Separation m Isolation dB 5 75 0 5 45 5 10 87 1 10 51 7 20 99 1 50 65 5 30 106 2 100 71 5 40 111 2 150 75 1 50 115 0 250 77 6 Vertical and Horizontal Antenna Separation 900 MHz The antenna separation table demonstrates that vertical separation yields better results than horizontal separation However when desired isolation cannot be met due to insufficient separation external shielding can help for...

Page 26: ...bile moves from the repeater s area to a neighboring site the base station handles the hand off in the same way as for a mobile in the base station area 8 3 Installation Tools You will need the following basic tools for installation a Standard wrenches screwdrivers cable stripper cable cutter pliers set for installing the R4 repeater Unit and antennas Refer to the manufacturer s recommendations fo...

Page 27: ...the vital parameters since it also decides the area required to be provided with RF coverage The noise contribution has to be minimum while setting the gain hence it should be set with utmost care The variation in gain up to 31 dB in steps 1 dB is possible to be achieved with the help of attenuator provided in the system The gain setting for Uplink and Downlink path is independent of each other Fo...

Page 28: ... Record the value of attenuation introduced for setting the gain 8 7 Dos Don t Dos 1 The site should be accessible for the maintenance purposes 2 Arrangement is to be made to avoid unauthorized access to the repeater 3 The repeater is designed for indoor applications the housing is not waterproof It should be installed from where it is not exposed to direct sunlight excessive moisture 4 Stable pow...

Page 29: ...Gain set of the repeater 2 Actual isolation measured 3 Ensure proper grounding of the unit 4 Cable from donor antenna connected to donor antenna port 5 Cable from server antenna connected to the relevant port in the unit 6 Mains cable connected to the repeater unit 7 Cable protection ensured and outdoor connections are waterproof B Repeater Set Up S NO Point s To be Verified Remarks 1 Number of su...

Page 30: ...signal path Pay particular attention to large metallic objects that reflect or block the signals to the weak coverage area If weak coverage area still persists check the following a Inspect the indoor RF coaxial cable and its connection with connector b Indoor antenna direction and its tilting Repeater gain setting II Defective Indoors coaxial cable Antenna Check the RF coaxial cable and antenna I...

Page 31: ... achieved by properly locating the donor and server antennas respectively The optimal location for the donor antenna is high above the roofline and exterior to the building The indoor coverage antenna server should be installed inside near or below the ceiling Following guidelines should ensure adequate isolation between antennas a Never mount the donor or server antenna near a window where signal...

Page 32: ... Generation Signal Enhancement TYPICAL PRODUCT APPLICATION Figure 11 R4 Application Link Budget Donor Antenna 12dBi gain RF Signal 62dBm R4 Repeater Input 48dBm Cable loss 2 dB Gain 80 dB Cable loss 2 dB Repeater O P 32dBm Server Antenna 3dBi gain EIRP 33 dBm ...

Page 33: ...resses For Americas Shyam Telecom Inc 6 KILMER ROAD SUIT D EDISON New Jersy 08817 USA For Europe Shyam Telecom GmbH Frohsinnstrasse 16 63739 Aschaffenburg Germany Tel 49 6021 45901 0 Fax 49 6021 45901 29 For ASEAN Others Shyam Telecom Ltd 246 Phase IV UDYOG VIHAR GURGAON 122015 INDIA Tel 91 124 4311600 FAX 91 124 4018117 Email contact shyamtelecom com ...

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