Weehawken Tunnel Radio Repeater System User/Maintenance Handbook For G.E Transport Systems AFL Works Order Nō.: Q112727 AFL product part Nō.’s: 50-118501 (2 Ch 900MHz Pager) 80-231302 (800MHz Power Supply) 80-231303 (Alarm System) Weehawken Tunnel 900MHz Pager System User/Maintenance Handbook Handbook Nō.
Table of Contents INTRODUCTION ............................................................................................................................................5 Scope................................................................................................................................................................................ 5 Purpose....................................................................................................................................................
6.4.2 Switched Attenuators..................................................................................................................................... 30 6.5 Low Noise Amplifier (11-005902) .................................................................................................................. 31 6.5.1 Description.................................................................................................................................................... 31 6.5.
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_900 Weehawken Tunnel 900MHz Pager System 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] 50-118501 PRODUCT DESCRIPTION Weehawken tunnel 900MHz pager system 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 MANUFACTUR
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 900MHz Pager System 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. All the hardware is built into standard 19” rack mounted cabinets which have an environmental IP rating of 54. There is also a single, free standing wall mounted amplifier which carries the whole signal network to the River Portal area.
3. WEEHAWKEN RACK DRAWINGS Rack 3 3.1 3.1.1 Pager/800MHz Rack System Diagram, Drg. Nō. 80-231483 Weehawken Tunnel 900MHz Pager System User/Maintenance Handbook Handbook Nō.
3.1.2 Rack 3 Layout and Interconnections Diagram, Drg. Nō. 80-231454 Weehawken Tunnel 900MHz Pager System User/Maintenance Handbook Handbook Nō.
3.1.3 Rack to Rack Interconnections Diagram, Drg. Nō. 80-231455 Weehawken Tunnel 900MHz Pager System User/Maintenance Handbook Handbook Nō.
24V Inputs Handbook Nō.
3.2 Weehawken System Frequencies Look-up Table Agency New Jersey Transit Paging New Jersey Transit Paging Channel Number 900 CHN 1 900 CHN 2 Uplink Tx Downlink Rx 929.5875 929.6125 Weehawken Tunnel 900MHz Pager System User/Maintenance Handbook Handbook Nō.
4. DOWNLINK PAGING AMPLIFIER 4.1 4.1.1 Two Channel 900MHz Pager Cell Enhancer (50-118501) Two Channel 900MHz Pager Cell Enhancer Description The pager cell enhancer provides two channels (downlink only) in the 900MHz band for the NJ Transit system. These two frequencies are relayed to all the sites (leaky feeders) in the system. All amplifiers have built-in alarms which are configured as a summary, volt-free relay contact pair terminating at pins 1 & 2 on the ‘D’ type alarm connector. 4.1.
4.1.3 Two Channel 900MHz Pager System Diagram, Drg. Nō. 50-118581 Weehawken Tunnel 900MHz Pager System User/Maintenance Handbook Handbook Nō.
4.1.4 Two Channel 900MHz Pager Cell Enhancer Outline Drawing Weehawken Tunnel 900MHz Pager System User/Maintenance Handbook Handbook Nō.
4.1.
5. POWER SUPPLIES & ALARMS 5.1 800MHz Power Supply (80-231302) 5.1.1 800MHz Power Supply Description The power supply for the 800MHz cell enhancer uses 15V PSU modules ‘turned down’ to 12V (all the amplifiers in the 800MHz CE use 12V DC supply). It is a standard power supply shelf using two PSU modules with their outputs combined through power diodes and terminating in six, dedicated 12V outputs.
5.1.4 800MHz Power Supply Outline Drawing, Drg. Nō. 80-231392 Weehawken Tunnel 900MHz Pager System User/Maintenance Handbook Handbook Nō.
5.1.5 800MHz Power Supply Parts List AFL Part Nō.
5.2 5.2.1 Alarm/Monitor Shelf (80-231303) Alarm/Monitor Shelf Description The alarm shelf acts as an alarm concentrator for all the alarms in the system. Firstly, within each shelf containing active components, the individually alarmed modules are ‘summed’ and presented to that shelves’ 9-way alarm connector as a volt-free relay contact pair. These alarm contact pairs are wired to the krone block in the lower rack space and from there the pairs are presented to the alarm shelf.
5.2.3 Alarm/Monitor Shelf Parts List AFL Part Nō. 19-000724 19-000725 19-000826 20-001601 91-520003 91-520005 91-520010 91-600014 91-600015 96-300072 96-600001 96-700034 96-700035 Part Description 1U 19" UNIT FRONT PANEL FAB 1U 19" UNIT 400 DEEP CHASSIS + BKT 2U,3U,4U 19" UNIT 400 DEEP LID 12V RELAY BOARD POWER SWITCHD/FUSED MAINS INL.
6. SUB-UNIT MODULES Note that the sub unit modules are tabled in part number order – the modules pertinent to any particular shelf will be found in the parts list under the heading of that shelf. 6.1 6.1.1 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.
6.2 6.2.1 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.
6.3 6.3.1 900MHz Splitter/Combiner (05-002602) Description The Splitter/Combiner used is a device for accurately matching two or more RF signals to single or multiple ports, whilst maintaining an accurate 50Ω load to all inputs/outputs and ensuring that the VSWR and insertion losses are kept to a minimum. Any unused ports will be terminated with an appropriate 50Ω load. Being passive devices, the splitters should have an extremely long operational life and require no maintenance.
6.4 6.4.1 ¼Watt 0- -30 & Switched Attenuator (10-000701) General Application In many practical applications for Cell Enhancers etc., the gain in each path is found to be excessive. Therefore, provision is made within the unit for the setting of attenuation in each path, to reduce the gain. 6.4.2 Switched Attenuators The AFL switched attenuators are available in two different types; 0 – 30dB in 2 dB steps, or 0 – 15dB in 1 dB steps.
6.5 Low Noise Amplifier (11-005902) 6.5.1 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.
6.6 6.6.1 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.
6.7 6.7.1 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. 6.7.
6.8 6.8.1 D.I.P Channel Control Module (17-002101) Description The operating frequency for each channel in each repeater is programmed by 16 DIL (Dual In Line) switches. The programming switches are mounted in the Channel Control Module. The Channel Selectivity Modules are connected to the Channel Control Module via multiway ribbon cables. Adjacent to the DIL switches for each channel is a toggle switch to turn on and off individual channels as required.
6.8.2 Programming Procedure Check that the required frequency falls within the operational frequency limits of the Cell Enhancer. For each channel required, subtract the synthesiser offset from the required operating frequency and record the resulting local oscillator frequency. Divide each local oscillator frequency by the channel spacing and check that the result is an integer (i.e: no remainder).
6.8.4 25kHz step size switch functions Switch Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 6.8.5 Synthesiser offset added when switch in UP position +25kHz +50kHz +100kHz +200kHz +400kHz +800kHz +1.6MHz +3.2MHz +6.4MHz +12.8MHz +25.6MHz +51.2MHz +102.4MHz +204.8MHz +409.6MHz +819.2MHz Programming Example Frequency required: 454.000MHz Channel spacing: 12.5kHz Synthesiser offset: -21.4MHz The Local Oscillator frequency is therefore: 454.000 – 21.4 = 432.
6.8.6 17-002101 Controller Module DIP Switch Connector Data IDC PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 25-way Connector 13 25 12 24 11 23 10 22 9 21 8 20 7 19 6 18 5 17 4 16 3 15 2 14 1 --- Function (12.5kHz steps) Freq. bit 1 (12.5kHz) Freq. bit 2 (25kHz) Freq. bit 3 (50kHz) Freq. bit 4 (100kHz) Freq. bit 5 (200kHz) Freq. bit 6 (400kHz) Freq. bit 7 (800kHz) Freq. bit 8 (1.6MHz) Freq. bit 9 (3.2MHz) Freq. bit 10 (6.4MHz) Freq. bit 11 (12.8MHz) Freq. bit 12 (25.
Drg. Nō. 17-002190, DIP Switch Module Controller Outline Drawing 1 OFF ON CHANNEL 1 3 4 1 1 1 2 2 2 2 3 3 3 3 4 4 4 4 5 5 5 5 6 6 6 6 7 7 7 ON. 7 8 ON. 8 ON. 8 8 1 1 1 1 2 3 2 3 2 3 2 3 4 4 4 4 5 5 5 5 6 6 6 6 7 7 7 7 4 1 POW ER 16 SWITCH 1 ON. 8 SWITCH 16 ON. 8 5 ON CHANNEL 4 CHANNEL CONTROL MODULE THIRD ANGLE PROJECTION OFF 8 5 Tel : 01494 777000 Fax : 01494 777002 Aerial Facilities Limited England ON.
6.9 6.9.1 Channel Selective Modules (17-003033, 17-009143, 17-009127 & 17-010803) Description The channel selectivity module is employed when the Cell Enhancer requirement dictates that very narrow bandwidths (single operating channels), must be selected from within the operating passband. One channel selectivity module is required for each channel.
6.9.2 Drg. Nō. 17-003080, Generic Channel Module Block Diagram Weehawken Tunnel 900MHz Pager System User/Maintenance Handbook Handbook Nō.
6.10 12 & 24V Relay Boards (20-001601 & 20-001602) 6.10.1 Description The General Purpose Relay Board allows the inversion of signals and the isolation of circuits. It is equipped with two dual pole change-over relays RL1 and RL2, with completely isolated wiring, accessed via screw terminals. Both relays are 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.
6.11 12 & 24V Single Relay Board (80-008901 & 80-008902) 6.11.1 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.
7. INSTALLATION When this equipment is initially commissioned, please use the equipment set-up record sheet in Appendix A. This will help both the installation personnel and AFL should these figures be needed for future reference or diagnosis. 7.1 General Remarks The size and weight of the equipment racks mean that they represent a significant topple hazard unless they are securely bolted to the floor though the mounting holes in the base of the unit.
7.2 RF Connections All RF connections are made to the cable termination, located on the bulkhead at the rear of the equipment at floor level. Care must be taken to ensure that the correct connections are made with particular attention made to the base station TX/RX ports. In the event that the base transmitter is connected to the RX output of the rack, damage to the equipment will be done if the base station transmitter is then keyed. Ensure that connections are kept clean and are fully tightened. 7.
8. MAINTENANCE 8.1 8.1.1 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.
8.1.3 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.
8.1.6 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.
8.3 8.3.1 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. 8.3.
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.
