Andrew Wireless Innovations Group RPT-MR703 Bi-Directional Amplifier for Small Area Indoor Coverage User Manual M0041A3A

Andrew Wireless Innovations Group Bi-Directional Amplifier for Small Area Indoor Coverage M0041A3A

User Manual

M0041A3A.doc Id.-No. 149678 22-Jan-99User's guide MR703models A, B and DInstallation and setting to workThe electrical installation has to be performed inaccordance with the safety regulations of the localauthorities. Due to safety reasons the electricalinstallation must be performed by qualifiedpersonnel only. The Repeater must not be opened !Mechanical installationThe mechanical installation has to be done accordingto the attached wall mounting sheet. Mount the Unithorizontally only. Otherwise the radiation pattern ofthe internal antenna is not optimised.Configuration of the LEDs and connectorsFirst of all the difference between the modelsA, B and D is given. The difference between models Aand B is simply the different gain whereas model Dprovides an additional duplexer for the connection ofan antenna to/from the mobiles. That means that themodel D has got an additional RF port at the oppositeside to the RF port to/from the BTS. A block diagramof both models (A,B and D) is given on the next page.The following explanation is made with respect to thefigure shown above. The RF connector (SMA female)is situated in the middle of the Repeater. This port hasto be connected to the RF cable of the antenna to/fromthe BTS.The socket for the DC supply is situated to the right ofthe RF connector. Power supply voltage is 6.7 Vdc,current is 1.2 A typ.You have two possibilities to provide the MR703 withpower.The first one is to use an external power supply andconnect it to the DC socket of the Repeater and theother one is to bias the MR703 via the cable to the RFport to/from BTS. If you use an external power supplyuse only the power supply that was shipped with theunit. If you want to bias the MR703 make sure that thecorrect voltage is fed into the MR703. Furthermore theDC socket of the MR703 must not be connected if thebias via RF cable is carried out.The indication of the LEDs is as follows: The LED onthe left hand side (DC alarm) can show green light orred light. A green LED indicates the normal operationof the Repeater. It shows that power is present and thatthe current consumption of the Unit is correct. A redindication of this LED means that the currentconsumption of the Repeater is not within a definedwindow and that the Repeater thus might not workproperly. If the LED is switched off the MR703 doesn'tget DC power at all.The LED next to this LED is the ALC/APAC alarmLED. If this LED is on it indicates that the inputpower into the Repeater is too high, so that the outputpower of the Repeater has to be limited. This can beeither the UL ALC or APAC or the DL ALC! Thislimitation ensures that the final stage is not overdrivenand that intermodulations are kept below the CEPTlimits(- 30 dBm).The RF port that is only implemented in the model Dhas to be connected to the external antenna thatestablishes the communication with the mobilephones.Electrical specificationThe electrical specification can be found on a separatesheet on which the values of the final measurments arenoted.
MIKOM GmbH * Industriering 10 * 86675 Buchdorf * GermanyTel. {+49} 9099-690 * Fax {+49} 9099-6931email: sales@mikom.com * http://www.mikom.comFunctional DescriptionThe MR703 is a Repeater operating in the PCS1900 frequency range. The operation principle is given withregard to the following block diagrams.MR703A/BMR703DDownlink signals reach the duplexer. The duplexer is the frequency separation unit that splits and recombinesuplink (UL) and downlink (DL).After the duplexer the signals get to a pre-amplifier and afterwards to a mixer. The mixer converts the signalsdown to an intermediate frequency (IF). An IF filter provides the selectivity of the Repeater. After the IF filter thesignals are reconverted to the original frequency again by means of another mixer. A final amplifier amplifies thesignal again and provides the required output power.After the final amplifier a power detection measures the output power and controls the gain. This is calledautomatic gain control (ALC) and keeps intermodulations below - 30 dBm. Finally, the signals are fed to thebuilt-in antenna of the Repeater (MR703A/B) or the duplexer and thus to the external antenna (MR703D).The uplink signals are received by the integrated antenna of the Repeater (MR703A/B) or the external antennaand then to the duplexer (MR703D). After the antenna or duplexer a preselection of the frequency is made. Afterthat the signals are converted down to IF by means of a mixer and an IF filter provides the selectivity againstother frequencies. After the reconversion the signals are amplified in an amplifier that provides the output power.The signals are then fed to the antenna via the duplexer.In this link an ALC and an automatic power adjust circuit (APAC) is provided. APAC limits the output power iftwo carriers are present at the UL input. This again keeps intermodulations below the desired limit.Cabinet drawingonly in model DMechanicalDimensions:(W x H x D) approx. 166 x 120 x 60 mmWeight: approx. 550 gEnvironmental and safetyThe specifications for environmental and safety areaccording to ETS 300 019 (European Tele-communication Standard). For further details pleaseask your supplier for a leaflet.All data is subject to change without notice !

Navigation menu