Dekolink Wireless CBDASMRPS8 Bi-directional amplifier User Manual Installation and operating instructions

Dekolink Wireless Ltd Bi-directional amplifier Installation and operating instructions

Contents

Installation and operating instructions

FCC ID: OIW CBDASMRPS8Page 1 of 10INSTALLATION AND OPERATING INSTRUCTIONSThe following is a copy of Installation and Operating Instructions of the MW-CBDA-SMR-1W60PS-8 Cellular Bi-Directional Amplifier/Booster.
FCC ID: OIW CBDASMRPS8Page 2 of 10INSTALLATIONANDOPERATING INSTRUCTIONSFORMW-CBDA-SMR-1W60PS-8BI-DIRECTIONAL AMPLIFIER(COMPACT BDA)
FCC ID: OIW CBDASMRPS8Page 3 of 10TABLE OF CONTENTSPARAGRAPH PAGE NOBDA OVERVIEW 4BDA BLOCK DIAGRAM DESCRIPTION 4BDA BLOCK DIAGRAM DRAWING 5ELECTRICAL SPECIFICATIONS 6MECHANICAL SPECIFICATIONS 7ENVIRONMENTAL CONDITIONS 7BDA CONNECTIONS 8PERIODIC MAINTENANCE 8DIAGNOSTIC GUIDE 9MECHANICAL OUTLINE 10
FCC ID: OIW CBDASMRPS8Page 4 of 10 BDA OVERVIEW:The BDA assembly provides an exceptional repeater/boosterperformances to extend the coverage area of radiocommunications in buildings and RF shielded environments.Features such as high linearity power amplifiers are contributingfor the overall improved system linearity performances. The unit isbased on a duplexed path configuration, having sharp out of bandattenuation for improved isolation between the receiving andtransmitting paths.BDA BLOCK DIAGRAM DESCRIPTION:The BDA Downlink path receives the RF signals from base stationamplifies and transmits them to the subscriber. The BDA Uplinkpath receives the RF signals from the subscriber amplifies andtransmits them to the base station. Two duplexers frequencyseparate the signals to the proper amplifying path and isolate thetwo signals.BDA with AGC (Option A)The amplifiers in this BDA have an AGC feedback loop. The AGCcircuit senses the output power and when it exceeds the presetlevel of +20 dBm it introduces more attenuation. In this manner thegain of the amplifier is reduced, its output power is limited to +20dBm and the Intermodulation products are kept low.The AGC Dynamic range is 30 dB.
FCC ID: OIW CBDASMRPS8Page 5 of 10BDA BLOCK DIAGRAMMW-CBDA-SMR-1W60PS-8DuplexerDownlinkDuplexerUplinkTOBASESTATIONANTENNATO AREAANTENNA(N-TYPE)(N-TYPE)AGC RF AMPLIFIERAGC CIRCUITDETECTERAGC CIRCUITDETECTERAGC RF AMPLIFIERCOUPLERCOUPLERMGCMGC
FCC ID: OIW CBDASMRPS8Page 6 of 10ELECTRICAL SPECIFICATIONS:Frequency Range : Up Link : 806 – 824 MHz: Down Link : 851 – 869 MHzPassband Gain @ min attenuation : 60 dB minimumPassband Ripple : ±1.5 dB typicalNoise Figure @+25°C at max gain : 6.0 dB max3rd Order Intercept point : +45 dBm typicalIMD @2 tone @+20 dBm/carrier : 50 dBc typicalIsolation between Up/Down Link : 70 dB minImpedance Level : 50 OhmsVSWR In : 1.5 : 1 maxPower Supply : 80 to 240 VAC;50 to 60 Hz; @500 mA
FCC ID: OIW CBDASMRPS8Page 7 of 10MECHANICAL SPECIFICATIONS:Size : 9.84 x 9.61 x 4.53 inch (250 x 244 x 115 mm)RF Connectors : N-type FemaleWeight : 10 Lbs. (5kg.) approx.ENVIRONMENTAL CONDITIONS:The unit is designed for indoor applications: Operating temperature : - 30°C to + 50°CStorage temperature : - 50°C to + 90°C
FCC ID: OIW CBDASMRPS8Page 8 of 10BDA CONNECTIONSThe BDA AC power is supplied through a standard 3-wire maleplug with phase, neutral and safety ground wires. The AC power isonly used to supply a high efficiency DC switching power supply.The two amplifiers (Uplink and Downlink) and the Power On lampuse only DC power.The RF connection is made via two type “N” female connectors.The RF connector labeled “Base” must be connected to theantenna pointing to the base station. The RF connection labeled“Mobile” must be connected to the antenna pointing into the areato be covered by the BDA.The connections must be made through 50 ohms impedancecables.The isolation between the base station antenna and the mobileantenna should be at least 12 dB higher than the BDA gain. If theisolation were less than the BDA gain, oscillation would start andwould saturate the amplifier. Isolation few dB higher than the BDAgain cannot start oscillations but would causes gain ripple in theband.PERIODIC MAINTENANCEThe BDA should provide long term, care free operation with noneed of any periodic maintenance.The BDA has no user adjustments or alignments.The front panel lamp indicates power supply turn on.
FCC ID: OIW CBDASMRPS8Page 9 of 10DIAGNOSTICS GUIDEAs mentioned before the BDA should provide long term, care free operationwith no need of any periodic maintenance. This section will cover possibleproblems that may show up after installation.a. Gain ReductionPossible causes: Bad RF cables and RF connections to antennas, Damagedantennas.b. Excessive Intermodulation or SpuriousPossible causes:Amplifier oscillation caused by insufficient isolation. The isolation between twoantennas is given by the equation:Isolation = 92.5 + 20 Log ( F x D ) – Gt – GrF is frequency in GHzD is separation in KmGt is the transmit antenna gain (at the direction of the receive antenna).Gr is the receive antenna gain (at the direction of the transmit antenna).For example at the SMR frequency the antenna isolation at 100 m separationis about 71 dB for omni antennas (0 dB gain). To increase isolation theantennas should have higher directivity and must be pointed away from eachother.c. Occasional Drop-out of some ChannelsPossible causes: One channel with very strong power dominating the RFoutput of the amplifier.
FCC ID: OIW CBDASMRPS8Page 10 of 10MECHANICAL OUTLINE

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