Two Channel 400MHz Cell Enhancer User Handbook For AFL Inc. AFL Works Order Nō.: AFL product part Nō.: Q112941 50-128501 Two Channel 400MHz Cell Enhancer User Handbook Handbook Nō.
Table of Contents AMENDMENT LIST RECORD SHEET ...................................................................................................4 INTRODUCTION.........................................................................................................................................5 Scope ........................................................................................................................................................................... 5 Purpose ..........................
4.10.1 Description ........................................................................................................................................... 27 4.10.2 Drg. Nō. 17-003080, Generic Channel Module Block Diagram.......................................................... 28 4.11 12V Single Relay Board (80-008901) ........................................................................................................ 29 4.11.1 Description ..........................................................
AMENDMENT LIST RECORD SHEET Issue Nō. Date Incorporated by A 10/11/04 CMH 1st Draft CMH 1st Issue 1 Page No.’s Amended Reason for new issue Document Ref:-50-113901HBK Two Channel 400MHz Cell Enhancer User 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.
Glossary of Terms Repeater or Cell Enhancer Band Selective Repeater Channel Selective Repeater BTS C/NR Downlink (D.L.) Uplink (U.L.) EMC GND DC AC ID OIP3 LED M.S. N/A N/C NF RF Rx Tx S/N 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 Two Channel 400MHz Cell Enhancer User 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 This equipment is designed to enhance one 275kHz spaced channel in the 400MHz UHF band, and one IF select channel having 1.45MHz bandwidth also in the 400MHz band using 5 and 1Watt amplifiers on the downlink and uplink paths respectively. An RS232 controller/monitor together with a modem is fitted to provide remote monitoring of all active alarms and to allow remote re-configuration of channel module frequencies.
3. SPECIFICATIONS 3.1 Description See section 2. 3.2 Electrical Specification PARAMETER (Area) downlink: (Police) downlink: Frequency bands (Area) uplink: (Police) uplink: Nō. of Channels: Downlink1 bandwidth: Downlink2 bandwidth: Passband Ripple: Gain: Gain Adjustment: Uplink ALC setting: Downlink ALC setting: O/P Downlink: Power/Channel Uplink: @ Ant.
3.
3.4 System Diagram Q112941 50-128501 489.5125-490.9625 30dB 496.3375-496.6125 11-007402 30dB 11-007402 dB 10-000701 0dB 11-007402 dB 10-000701 0dB 30dB 30dB 12-021601 30dB 17-009304 30dB 11-007402 30dB BASE 30dB 17-009305 02-020001 11-007901 37dB 492.5125-493.9625 11-007901 37dB 499.3375-499.6125 11-007402 30dB MOBILE 0dB 17-009305 11-007402 30dB 0dB 17-009304 dB 10-000701 dB 10-000701 30dB 11-007402 30dB 11-007402 Two Channel 400MHz Cell Enhancer User Handbook Handbook Nō.
3.5 Parts Lists AFL Part Nō.
91-700017 92-120009 92-280033 92-280044 92-400017 93-510041 94-120003 96-000017 96-000018 96-300057 96-700034 96-700035 96-800003 96-900018 96-920011 96-920012 97-000001 97-000002 97-300010 97-400010 97-600001 97-600002 97-900004 99-200017 * ICD 15 WAY 0.1' CONNECTOR M20 IP68 CABLE GLAND Captive Screw SCREW SLOTTED COLLAR GASKET FOR N TYPE CONNECTOR 27R 1.
4. SUB-UNIT MODULES 4.1 4.1.1 UHF Notch Filter (02-020001) Description The notch reject filters fitted here are tuned to eliminate the unwanted channel frequencies of the band 1 amplifier (where the filters are fitted in the band 2 path and vice-versa). The filters should require no routine maintenance, being totally passive devices. If a filter is suspected of failure, no invasive measures are recommended as even opening the case of the device could render it unusable. 4.1.
4.2 4.2.1 Bandpass Filters (02-011204 & 02-013401) 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 combline design, and are carefully aligned during manufacture in order to optimise the insertion loss, VSWR and intermodulation characteristics of the unit.
4.3 4.3.1 30dB Power Monitor (07-012501) Description The purpose of these couplers is to tap off known portions (usually 15-30dB) of RF signal from transmission lines at the antenna ports, either resistively or by induction, and to combine them, for example through splitter units for different purposes (alarms/monitoring etc.), whilst maintaining an accurate 50Ω load to all ports/interfaces throughout the specified frequency range.
4.5 Low Noise Amplifier (11-007402) 4.5.1 Description The 30dB gain low noise amplifier used is a double 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 two 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.
4.6 4.6.1 1Watt Low Power Amplifier (11-007901) Description This amplifier is dedicated to be a 1.0 W driver from 380 MHz to 470 MHz. It is a 2 stage amplifier where each stage is in balanced configuration. It demonstrates very high linearity and good input/output VSWR. There is a Current Fault Alarm Function, which indicates failure of each one of the RF transistors by various alarm output options.
4.7 4.7.1 5Watt Medium Power Tetra Amplifier (12-021601) Description The power amplifier fitted to this unit is a multi-stage, solid state power amplifier. Class A circuitry is employed throughout the device to ensure excellent linearity over a wide dynamic frequency range. All the semi-conductor devices are very conservatively rated to ensure low device junction temperatures and a long, trouble free working lifetime. The power amplifier should require no maintenance over its operating life.
4.7.4 PA Connector (7) Pin-Outs Two Channel 400MHz Cell Enhancer User Handbook Handbook Nō.
4.8 4.8.1 Single DC/DC Converters (13-001704 & 13-001710) Description This unit it is used to derive a fixed voltage power supply rail from some higher voltage. Typically, it is used to derive 5V, 8V, 12V or 15V from a 24V input. The circuit is based upon an LM317 variable voltage regulator, which is capable of supplying a maximum of 1.5A output current. Note that at full output current the dissipation of the device must remain in limits, bearing in mind the voltage which is being dropped across it.
4.9 4.9.1 Controller/Monitor Board (17-005803) Description To meet the need for detailed control and status reporting of cell enhancers and other systems installed in inaccessible locations, AFL has developed an optional RS232C (RS232D) serial interface which may be incorporated into any of AFL’s range of cell enhancers.
4.9.2 Drg. Nō. 17-005880, Controller/Monitor PCB Pin-Outs Two Channel 400MHz Cell Enhancer User Handbook Handbook Nō.
4.10 Channel Selective Modules (17-009304 & 17-009305) 4.10.1 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.
4.10.2 Drg. Nō. 17-003080, Generic Channel Module Block Diagram Two Channel 400MHz Cell Enhancer User Handbook Handbook Nō.
4.11 12V Single Relay Board (80-008901) 4.11.1 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. 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.
4.13 15V Switch-Mode PSU (96-300054) 4.13.1 Description The power supply unit is a switched-mode type capable of supplying 15V DC at 27Amps continuously. The amplifiers in this unit will draw approximately 12-15Amps at 15V DC, so the PSU will be used conservatively ensuring a long operational lifetime. No routine maintenance of the PSU is required. If a fault is suspected, then the output voltage from the power supply may be measured on its output terminals. This is typically set to 15.2V.
5. INSTALLATION 5.1 Initial Installation Record 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. 5.
5.3 A). Antenna Isolation First set up the two antennas & measure the isolation between them. Yagi Yagi or leaky feeder Measure Isolation Between antennas Mobiles Base Site B) Install the Cell Enhancer with its gain set 10dB below the isolation figure obtained above. Yagi Yagi or leaky feeder Base Port Mobile Port Cell Enhancer Base Site (donor) Mobile Two Channel 400MHz Cell Enhancer User Handbook Handbook Nō.
5.4 General Remarks The size and weight of the wall-mount case is such that 2/3 persons may be needed to lift the equipment into position. Test the mechanical installation in the interests of safety, before any electrical, RF, or optical connections are made. The equipment must be located on a smooth, flat, perpendicular surface, sheltered if possible, that is made from a material suitable for bearing the weight of the enclosure, (brick or concrete is recommended).
6. MAINTENANCE 6.1 6.1.1 General Procedures 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 new equipment have simple causes often occurring as a 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.
6.1.3 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.
6.1.6 Checking service Following the repair of any part of the system it is recommended that a full end-to-end test is carried out in accordance with the test specification and that the coverage is checked by survey. It is important to bear in mind that the system includes a radiating cable network and base stations that may be faulty or may have been damaged. 6.1.7 Service Support Advice and assistance with maintaining and servicing this system are available by contacting Aerial Facilities Ltd. 6.
6.3 6.3.1 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. 6.3.
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 fins of the heatsink to threaded screw holes (or nuts and bolts), into the amplifier within the main case (side & top mounting).
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 dBm dB dBm V DOWNLINK CALCULATIONS Parameter Comments Input signal level (G) CE max.
