User's Manual

ManualsBrandsShyam Telecom ManualsElectronicsDual Band Repeater Cellular-850 + PCS-1900

Next Generation

Signal Enhancement

Figure 8: Donor Antenna

The Donor antenna with 16 dB gain transfers the intercepted signals

to the repeater and transmits uplink signals amplified by the repeater.

b. Diplexer

The signals received in the DL, through the antenna are split for individual

band processing. The dual band outputs are fed to two different

duplexers. One Diplexer is also provided before the server antenna in

order to distribute combined signals to mobile users.

In the UL, signals received from server antenna are split and fed to two

duplexers for processing. The amplified signals from both the duplexers

are combined for further transmission through Donor antenna to BTS.

c. Duplexer

The main function of duplexer is to isolate the uplink frequency from the

downlink frequency, i.e. isolate transmit path from receive path. Four

duplexer units are provided in the repeater, two in the Donor antenna side

and two in the server antenna side. Each duplexer transfers/receives

signals from respective diplexer 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.).

d. Low Noise Amplifier (LNA)

This module is provided after duplexer before the converter. The LNA

provides compensation for the losses suffered by the stream of weak

signals as it passes through splitter/combiner & duplexer (passive

devices). Four LNAs are provided, two each for individual bands in the UL

& DL directions.

. Page

Summary of content (15 pages)

PAGE 1
Next Generation Signal Enhancement Figure 8: Donor Antenna The Donor antenna with 16 dB gain transfers the intercepted signals to the repeater and transmits uplink signals amplified by the repeater. b. Diplexer The signals received in the DL, through the antenna are split for individual band processing. The dual band outputs are fed to two different duplexers. One Diplexer is also provided before the server antenna in order to distribute combined signals to mobile users.
PAGE 2
Next Generation Signal Enhancement e. Converter Module The basic block of converter module comprises of L.O., frequency mixer, filter and intermediate amplifier. The low noise amplified signals are converted to IF in frequency mixer with frequency fed from LO. The signals are passed through sharply tuned filters. Number of converters equipped shall depend on the number of sub bands configured in the system. Two converters (one for DL & one for UL) for each sub band are provided. f.
PAGE 3
Next Generation Signal Enhancement Figure 9: Server Antenna .
PAGE 4
Next Generation Signal Enhancement 7. DB5R Repeater Specifications 7.1. Electrical Specifications-RF S.NO. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. Parameter Number of Bands Frequency band in DL path. Frequency band in UL path.
PAGE 5
Next Generation Signal Enhancement Grey Convection Housing Color Cooling 7.5. Environmental Specification Conditions Specification -35oC to +550C (-310F to +1310F) Operating Temperature -300C to +750C (-220F to +1670F) IP-65 (NEMA 5) Storage Temperature Enclosure 7.
PAGE 6
Next Generation Signal Enhancement 8. Installation 8.1. Preparation Sheet- Pre Installation Before the installation commences, a preparation sheet to examine the various requirements is to be compiled as per detail given below: 1.
PAGE 7
Next Generation Signal Enhancement 8.2. Engineering Consideration a. Site Selection Site selection is one of the most critical decisions affecting the overall performance of the system. A repeater must be located where it can receive the maximum signal from the donor site in order to maximize the repeater’s output and performance, a signal strength greater than or equal to -75dBm is desired.
PAGE 8
Next Generation Signal Enhancement • The beam width for the DONOR antenna should be as small as possible. • The beam width for SERVER antenna is 60 degree to 120 degree. • There should be adequate vertical & horizontal separation between the DONOR & SERVER antennas to avoid interference and noise.
PAGE 9
Next Generation Signal Enhancement Cable loss (100 ft. of 7/8 inch) 2 dB Server Antenna Gain 9 dBi Repeater ERP +41 dBm c) Overlapping Coverage Ideally, the repeater system will be engineered with minimal overlapping coverage between the donor base station and the repeater. However, the mobile users will occasionally receive signals from both the donor and the repeater at similar levels.
PAGE 10
Next Generation Signal Enhancement The repeater is mounted at the pre-selected site firmly placed with clamps and other mechanical accessories. Connections as detailed are carried out: • RF cable routed from DONOR antenna is connected at the BTS port as indicated. • RF cable routed to SERVER antenna is connected at TX/RX port for signal distribution. • For energizing the system, the cable from AC mains is connected at AC mains port, range 100-240 V.
PAGE 11
Next Generation Signal Enhancement Alternatively, RF output power of repeater can be measured using the visual indication shown on the display panel of the repeater. Once the RF output power has been determined, the attenuation will have to be modified to reach the desired output signal level. The gain of repeater can be set using any of the following methods: a. Local manual mode (using built in key pad and display) b. Local USB serial interface mode (GUI based) c. Through (optional) wireless modem. b.
PAGE 12
Next Generation Signal Enhancement 11. Gain of the repeater should be set after taking antenna isolation in to consideration. 12. The estimation of coverage area should be confirmed. 13. The system should be made over for normal traffic after actual measurement of: a) RF power in the DL b) RF power in the UL c) Antenna Isolation d) Gain settings in DL & UL 14. Feedback regarding performance of the system must be obtained from the user. .
PAGE 13
Next Generation Signal Enhancement 8.7.Checklist – Post Installation After the installation of the system is accomplished, points as indicated in the checklist are verified. Service Bands Particulars: Frequency Band for Band 1 DL Frequency Band for Band 1 UL Frequency Band for Band 2 DL Frequency Band for Band 2 UL A. Repeater Installation S.NO. Point(s) To be Verified 1. 2. 3. 4. 5. 6. 7. Remarks Ensure isolation between server and donor antennas, it has to be 15 dB + Gain set of the repeater.
PAGE 14
Next Generation Signal Enhancement 9. System Maintenance 9.1. General The system normally operates without any operator intervention or maintenance. If, in the unlikely event of a unit failure, the field replaceable units (antenna unit, cables) should be checked for faults and the system restored. The faulty unit can be removed and replaced with a spare while the rest of the system is still operating. Soldering or local repair of the modules should be avoided for better maintenance point of view.
PAGE 15
Next Generation Signal Enhancement For Technical Support, please contact at any of the following addresses: 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 .