Weehawken Tunnel Radio Remote Repeater System User/Maintenance Handbook For G.E Transport Systems AFL Works Order Nō.: Q112727 AFL product part Nō.’s: 55-154901 (800MHz BS BDA) 80-231302 (800MHz Power Supply) 80-231303 (Alarm System) Weehawken Tunnel Remote Repeater User/Maintenance Handbook Handbook Nō.
Table of Contents INTRODUCTION ............................................................................................................................................5 Scope................................................................................................................................................................................ 5 Purpose....................................................................................................................................................
5.8 800MHz 1Watt Low Power Amplifier (12-021901)...................................................................................... 26 5.8.1 Description.................................................................................................................................................... 26 5.8.2 Technical Specification ................................................................................................................................. 26 5.8.3 LPA 7-Way Connector Pin-outs........
AMENDMENT LIST RECORD SHEET Issue Nō. A Date 05/09/2005 Incorporated by CMH Page No.’s Amended Reason for new issue 1st Draft Document Ref:-Weehawken_River_Portal Weehawken Tunnel Remote Repeater User/Maintenance Handbook Handbook Nō.
INTRODUCTION Scope 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. Purpose The purpose of this handbook is to provide the user/maintainer with sufficient information to service and repair the equipment to the level agreed.
EC DECLARATION OF CONFORMITY In accordance with BS EN ISO/IEC 17050-1&-2:2004 0086 AERIAL FACILITIES LTD Aerial House Asheridge Road Chesham Bucks HP5 2QD United Kingdom DECLARES, UNDER OUR SOLE RESPONSIBILITY THAT THE FOLLOWING PRODUCT PRODUCT PART NO[S] 55-154901 PRODUCT DESCRIPTION Weehawken tunnel remote amplifier IN ACCORDANCE WITH THE FOLLOWING DIRECTIVES: 1999/5/EC directives The Radio & Telecommunications Terminal Equipment Directive Annex V and its amending HAS BEEN DESIGNED AND MANUFACTURED
Glossary of Terms Repeater or Cell Enhancer Band Selective Repeater Channel Selective Repeater AC AGC BBU BTS CEMS C/NR DC Downlink (D/L) FO GND ID LED LNA LPA MOU M.S. MTBF N/A N/C OFR OIP3 PA RF RSA Rx S/N Tx Uplink (U/L) VSWR WDM A Radio Frequency (RF) amplifier which can simultaneously amplify and re-broadcast Mobile Station (MS) and Base Transceiver Station (BTS) signals. A Cell Enhancer designed for operation on a range of channels within a specified frequency band.
Key to AFL RF Module Drawing Symbols Weehawken Tunnel Remote Repeater User/Maintenance Handbook Handbook Nō.
1. SAFETY CONSIDERATIONS 1.1 Earthing of Equipment Cell Enhancers 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. 1.2 Electric Shock Hazard Electrical shocks due to faulty mains driven power supplies.
1.3 RF Radiation Hazard RF radiation, (especially at UHF frequencies) arising from transmitter outputs connected to AFL’s equipment, must be considered a safety hazard. This condition might only occur in the event of cable disconnection, or because a ‘spare’ output has been left unterminated. Either of these conditions would impair the system’s efficiency. No investigation should be carried out until all RF power sources have been removed.
1.4 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).
2. OVERVIEW/ SYSTEM DESCRIPTION 2.1 General System Description The Weehawken tunnel radio system is designed to amplify various bands of radio frequencies, in either channelised or band selective modes. This unit amplifies all the RF bands to the ‘River Portal’ area in a band-selective mode with AGC in the uplink direction. All the hardware is built into a standard environmentally protected cabinet which has an IP rating of 65.
3. MULTI-BAND SELECTIVE CELL ENHANCER (RIVER PORTAL) 3.3 Band Selective BDA (55-154901) 3.3.1 Band Selective BDA Description The band selective BDA which covers the ‘River Portal’ site carries two downlink paths and one uplink path, all with automatic gain control on the last amplification stage in each path. Cross band couplers are fitted to the input and output to facilitate a low frequency bypass of the 800MHz BDA allowing the lower frequency signals to pass unhindered.
3.3.
3.3.4 Band Selective BDA System Diagram 55-154981 Weehawken Tunnel Remote Repeater User/Maintenance Handbook Handbook Nō.
3.3.5 Band Selective BDA Outline Drawing, Drg. Nō. 50-118181 Weehawken Tunnel Remote Repeater User/Maintenance Handbook Handbook Nō.
3.3.6 Weehawken System Frequencies Look-up Table Agency Jersey City Medical Center - EMS North Hudson Regional Fire and Rescue NJ Statewide Police (SPEN) Jersey City Medical Center - EMS Jersey City Medical Center - EMS North Hudson Regional Fire and Rescue Weehawken Township Weehawken Township New Jersey Transit Police Dept.
3.3.7 Band Selective BDA (55-154901) Parts List AFL Part Nō.
4. ALARMS 4.1 4.1.1 Alarm/Monitor System Alarm/Monitor Description The alarm system acts as an alarm concentrator for all the alarms in the unit. Firstly, within each active component, the individually alarmed modules are ‘summed together’ and presented to the outside world as a volt-free, relay contact pair (pins 1 & 2 in the IP65 alarm connector. As all the alarms in the system are ‘held closed loops’, should the power supply fail, the main system alarm will be triggered. 4.1.
5. SUB-UNIT MODULES 5.1 5.1.1 Bandpass Filter (02-004502) Description The bandpass filters are multi-section designs with a bandwidth dependent upon the passband frequencies, (both tuned to customer requirements). The response shape is basically Chebyshev with a passband design ripple of 0.1dB. The filters are of slot coupled, folded combline design, and are carefully aligned during manufacture in order to optimise the insertion loss, VSWR and intermodulation characteristics of the unit.
5.2 5.2.1 Bandpass Filter (02-007206) Description The bandpass filters are multi-section designs with a bandwidth dependent upon the passband frequencies, (both tuned to customer requirements). The response shape is basically Chebyshev with a passband design ripple of 0.1dB. The filters are of slot coupled, folded combline design, and are carefully aligned during manufacture in order to optimise the insertion loss, VSWR and intermodulation characteristics of the unit.
5.3 5.3.1 Crossband Coupler (07-005705) Description The purpose of a crossband coupler is to either combine/split transmission signals from different parts of the frequency spectrum. It basically comprises of a 3 port device, two filters, one a low pass, the other a high pass feeding a common output. In this case, a VHF spectrum signal source is to be combined with a band 2 FM source, (many other combinations are also possible).
5.5 Low Noise Amplifier (11-005902) 5.5.1 Description The Gallium-Arsenide low noise amplifier used in the unit is a double stage, solid-state low noise amplifier. Class A circuitry is used throughout the units to ensure excellent linearity and extremely low noise over a very wide dynamic range. The active devices are very moderately rated to provide a long trouble-free working life.
5.6 5.6.1 Low Noise Amplifier (11-006702) Description The Gallium-Arsenide low noise amplifiers used in the system are double stage, solid-state low noise amplifiers. Class A circuitry is used throughout the units to ensure excellent linearity and extremely low noise over a very wide dynamic range. The active devices are very moderately rated to provide a long trouble-free working life.
5.7 5.7.1 20W Power Amplifier (12-018002) Description This amplifier is a Class A 20W power amplifier from 800-960MHz in a 1 stage balanced configuration. It demonstrates a very high linearity and a very good input/output return loss (RL). It has built in a Current Fault Alarm Function. Its housing is an aluminium case (Alocrom 1200 finish) with SMA connectors for the RF input/output and a D-Type connector for the power supply and the Current Fault Alarm Function. 5.7.
5.8 5.8.1 800MHz 1Watt Low Power Amplifier (12-021901) Description The low power amplifier used is a triple stage solid-state low-noise amplifier. Class A circuitry is used in the unit to ensure excellent linearity over a very wide dynamic range. The three active devices are very moderately rated to provide a long trouble-free working life. There are no adjustments on this amplifier, and in the unlikely event of failure then the entire amplifier should be replaced. 5.8.
5.9 5.9.1 Wide Dynamic Range AGC (17-001109, det. & 17-001201, atten.) Description The equipment is fitted with a wide dynamic range Automatic Gain Control (AGC) system. This is generally fitted in the Uplink path (not usually needed in the downlink path, as the signal here is at an almost constant level), to avoid overloading the amplifiers (with the associated performance degradation) should a mobile be operated very close to the unit.
For small signals, below AGC onset, the output control line will be close to 12V and the AGC attenuator will have minimum attenuation. As the signal level increases the control line voltage will fall, increasing the attenuator value and keeping the system output level at a constant value. The AGC onset level is adjusted by the choice of sampler resistor R1 and by the setting of potentiometer VR1, (factory set @ time of system test) do not adjust unless able to monitor subsequent RF levels.
5.10 12V Single Relay Board (80-008901) 5.10.1 Description The General Purpose Relay Board allows the inversion of signals and the isolation of circuits. It is equipped with a single dual pole change-over relay RL1, with completely isolated wiring, accessed via a 15 way in-line connector. The relay is provided with polarity protection diodes and diodes for suppressing the transients caused by "flywheel effect" which can destroy switching transistors or induce spikes on neighbouring circuits.
6. INSTALLATION 6.1 Wall Mounted Equipment The procedure for installing and commissioning a wall-mounted Bi-Directional Amplifier unit is generally as follows: 1 Fix the unit in the chosen position. Ensure the mounting site is a straight, smooth, perpendicular surface (brick or concrete recommended). 2 Fix the two antennas and connect them to the BDA. 3 Connect a suitable mains and/or battery power supply to the unit.
7. MAINTENANCE 7.1 7.1.1 Fault Finding 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 tunnel 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.
7.1.3 Downlink Confirm that there is a signal at the expected frequency and strength from the base station. If this is not present then the fault may lay outside the system. To confirm this, inject a downlink frequency signal from a known source at the master site BTS input and check for output at the remote site feeder output. If a signal is not received at the output it will be necessary to follow the downlink path through the system to find a point at which the signal is lost.
7.1.6 Fault repair Once a faulty component has been identified, a decision must be made on the appropriate course to carry out a repair. A competent engineer can quickly remedy typical faults such as faulty connections or cables. The exceptions to this are cable assemblies connecting bandpass filter assemblies that are manufactured to critical lengths to maintain a 50-ohm system. Care should be taken when replacing cables or connectors to ensure that items are of the correct specification.
7.3 7.3.1 Care of Modules General Comments 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. To prevent damage to a module, it must be withdrawn/inserted with care. The module may have connectors on its underside, which might not be visible to the service operative. 7.3.
5) If the amplifier to be removed has a heatsink attached, there may be several different ways it can have been assembled. The most commonly used method, is screws through the front of the heatsink to threaded screw holes (or nuts and bolts), into the amplifier within the main case. If the heatsink is mounted on the rear of the main case (e.g.
APPENDIX A INITIAL EQUIPMENT SET-UP CALCULATIONS GENERAL INFORMATION Client Name: AFL Equip. Model Nō. Site Name: Date: Model ANTENNA SYSTEMS Gain Azimuth Comments Type Loss Comments A - Service Antenna B – Donor Antenna Length C – Service Feeder D – Donor Feeder INITIAL PARAMETERS E – CE Output Power F – Antenna Isolation G – Input signal level from donor BTS Operating Voltage DOWNLINK CALCULATIONS Parameter Comments Input signal level (G) CE max.
