Baltimore Transit Radio Repeater System User/Maintenance Handbook (4) for Intelect Corp. AFL Works Order: AFL product part No.: Q113737 60-166801 Aerial Facilities Limited Technical Literature Baltimore Radio Repeater System Maintenance Handbook Handbook Number 60-166801HBKM Issue No.
1. INTRODUCTION Scope and Purpose of this Document This handbook is for use solely with the equipment identified by the AFL Part Number shown on the front cover. It is not to be used with any other equipment unless specifically authorised by Aerial Facilities Limited. This is a controlled release document and, as such, becomes a part of Aerial Facilities’ Total Quality Management System. Alterations and modification may therefore only be performed by Aerial Facilities Ltd.
Table of Contents 1. INTRODUCTION.......................................................................................................................... 2 Scope and Purpose of this Document................................................................................................. 2 Limitation of Liability Notice................................................................................................................. 2 2. SAFETY CONSIDERATIONS .................................................
2. SAFETY CONSIDERATIONS 2.1 Earthing of Equipment Equipment supplied from the mains must be connected to grounded outlets and earthed in conformity with appropriate local, national and international electricity supply and safety regulations. 2.
2.4 Chemical Hazard Beryllium Oxide, also known as Beryllium Monoxide, or Thermalox™, is sometimes used in devices within equipment produced by Aerial Facilities Ltd. Beryllium oxide dust can be toxic if inhaled, leading to chronic respiratory problems. It is harmless if ingested or by contact. Products that contain beryllium are load terminations (dummy loads) and some power amplifiers. These products can be identified by a yellow and black “skull and crossbones” danger symbol (shown above).
3.
3.1 3.2 Off-Air (M.O.C.E) Remote Repeater (60-166801) Off-Air (M.O.C.E) Remote Repeater Description The off-air (M.O.C.E) repeater is linked to the master site by a dedicated antenna and has a low power (5Watts) downlink output to the mobile antenna. The repeater has an automatic gain control loop in each path to lessen the overloading effects of a mobile operated close to the uplink leaky feeder antennas.
3.5 Off-Air (M.O.C.E) Remote Repeater System Diagram, Drg. No. 60-166881 Maintenance Handbook Baltimore Radio Repeater System Handbook No.
3.6 Off-Air (M.O.C.E) Remote Repeater Alarm Wiring Details, Drg. No. 60-166851 Maintenance Handbook Baltimore Radio Repeater System Handbook No.
3.7 MOCE Site UHF AIF BDA Outline Drawing, Drg. Nǀ. 60-166891 Maintenance Handbook Baltimore Radio Repeater System Handbook No.
3.8 Off-Air (M.O.C.E) Remote Repeater Parts List (60-166801) AFL Part No.
4. INSTALLATION & COMMISIONING 4.1 Initial Installation Record When this equipment is initially commissioned, please use the equipment set-up record sheet in the Appendices. This will help both the installation personnel and AFL should these figures be needed for future reference or diagnosis. 4.
4.3 A). Antenna Isolation First set up the two antennas & measure the isolation between them. Measure Isolation between antennas Yagi Yagi or leaky feeder Mobiles Base site (donor) B). Install the Cell Enhancer with its gain set 10dB below the isolation figure obtained above. Yagi or leaky feeder Yagi Base port Mobile port Cell Enhancer Mobiles Base site (donor) Maintenance Handbook Baltimore Radio Repeater System Handbook No.
4.4 Rack Mounted Equipment The size and weight of the equipment racks mean that they represent a significant topple hazard unless they are bolted to the floor though the mounting holes in the base of the unit. In the interests of safety this should be done before any electrical, RF, or optical connections are made. The equipment must be located on a flat, level surface that is made from a material suitable for bearing the weight of the rack assemblies.
4.6 Wall Mounted Equipment The procedure for installing and commissioning a wall-mounted Bi-Directional Amplifier unit is generally as follows: 3 Fix the unit in the chosen position. Ensure the mounting site is a straight, smooth, perpendicular surface (brick or concrete recommended). Mounting bracket centres/dimensions will be found in the specifications section (3.3). After fixing, mechanically test the installation before proceeding.
5. FAULT FINDING / MAINTENANCE 5.1 Tools & Test Equipment The minimum tools and test equipment needed to successfully service this AFL product are as follows:Spectrum analyser: Signal Generator: Attenuator: Test Antenna: Digital multi-meter: Test cable x 2: Test cable x 2: 100kHz to 2GHz (Dynamic range = 90dB). 30MHz to 2GHz (-120dBm to 0dBm o/p level). 20dB, 10W, DC-2GHz, (N male – N female). Yagi or dipole for operating frequency. Universal Volt-Ohm-Amp meter. N male – N male, 2M long RG214.
5.3 Quick Fault Checklist All AFL equipment is individually tested to specification prior to despatch. Failure of this type of equipment is not common. Experience has shown that a large number of fault conditions relating to installations result from simple causes often occurring as result of transportation, unpacking and installation. Below are listed some common problems which have resulted in poor performance or an indicated non-functioning of the equipment.
5.8 Care of Modules Many of the active modules contain semiconductor devices utilising MOS technology, which can be damaged by electrostatic discharge. Correct handling of such modules is mandatory to ensure their long-term reliability. Good engineering practices should be observed at all times. To prevent damage to a module, it must be withdrawn/inserted with care. 5.
5.12 Low Power Amplifier Replacement Disconnect the mains power supply and disconnect the 24V dc supply connector for the LPA. Disconnect the RF input and output cables from the LPA. Disconnect the alarm connector (D type connector). Remove the LPA module by removing the four retaining screws, replace with a new LPA module and secure it with the screws. Connect the RF cables to the LPA input and output connectors. Reconnect the wires to the alarm board connector pins 9 and 10.
6 APPENDIXES 6.1 Glossary of Terms used in this document Repeater or Cell Enhancer Band Selective Repeater Channel Selective Repeater AC AGC BBU BTS CEMS C/NR DAB DC Downlink (D/L) FO GND ID LED LCX LNA LPA MOU M/S MS MTBF N/A N/C OFR OIP3 PA RF RSA RX S/N TTL TX Uplink (U/L) VSWR WDM A Radio Frequency amplifier which can simultaneously amplify and rebroadcast Mobile Station and Base Transceiver Station signals.
6.2 AFL RF Module Drawing Key Maintenance Handbook Baltimore Radio Repeater System Handbook No.
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6.4 Issue No. A 1 Amendment List Record Sheet Date 09/02/2006 Incorporated by CMH CMH Page Nos. Amended Reason for new issue 1st Draft 1st Issue Document Ref:- 60-166801HBKM Maintenance Handbook Baltimore Radio Repeater System Handbook No.
