PBE Europe as Axell Wireless 50-1225SERIES 6 Channel VHF Repeater 50-122501 User Manual
Axell Wireless 6 Channel VHF Repeater 50-122501
User manual
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12 Channel VHF Repeater User Handbook For W.O.W AFL Works Order Nō.:Q112547 AFL product part Nō.:50-122501 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-1 of 40 Table of Contents AMENDMENT LIST RECORD SHEET ...................................................................................................4 INTRODUCTION.........................................................................................................................................5 Scope ........................................................................................................................................................................... 5 Purpose ....................................................................................................................................................................... 5 Glossary of Terms...................................................................................................................................................... 6 Key to AFL RF Module Drawing Symbols ............................................................................................................. 7 1. SAFETY CONSIDERATIONS.........................................................................................................8 1.1 1.2 1.3 1.4 1.5 2. 3. Earthing of Equipment ................................................................................................................................ 8 Electric Shock Hazard.................................................................................................................................. 8 RF Radiation Hazard ................................................................................................................................... 9 Chemical Hazard ........................................................................................................................................ 10 Emergency Contact Numbers.................................................................................................................... 10 OVERVIEW/SYSTEM DESCRIPTION .......................................................................................11 SPECIFICATION ............................................................................................................................12 3.P 3.1 3.2 3.3 3.4 3.5 3.5 4. Cell Enhancer Case Internal Photograph ................................................................................................ 12 Description .................................................................................................................................................. 13 Electrical Specification............................................................................................................................... 13 Mechanical Specification............................................................................................................................ 14 System Diagram, Drg. Nō. 50-122580 ....................................................................................................... 15 Generic System Case Outline Drawing..................................................................................................... 16 Parts List ..................................................................................................................................................... 17 SUB-UNIT MODULES....................................................................................................................18 4.1 4.1.1 4.1.2 4.2 4.2.1 4.2.2 4.3 4.3.1 4.3.2 4.3.3 4.4 4.4.1 4.4.2 4.5 4.5.1 4.5.2 4.6 4.6.1 4.6.2 4.7 4.7.1 4.7.2 4.7.3 4.7.4 4.8 4.8.1 4.8.2 4.9 4.9.1 3 Port Tx Hybrid Couplers (05-000103 & 05-000104) ............................................................................ 18 Description ............................................................................................................................................... 18 Technical Specification............................................................................................................................. 18 ¼Watt 0- -30dB Switched Attenuator (10-000703).................................................................................. 19 General Application ................................................................................................................................. 19 Switched Attenuators ................................................................................................................................ 19 VHF/UHF Low Noise Amplifier (11-006002)........................................................................................... 20 Description ............................................................................................................................................... 20 Technical Specification............................................................................................................................. 20 LNA ‘D’ Connector Pin-out details .......................................................................................................... 20 10Watt Power Amplifier (12-002001) ....................................................................................................... 21 Description ............................................................................................................................................... 21 Technical Specification............................................................................................................................. 21 20Watt Power Amplifier (12-003601) ....................................................................................................... 22 Description ............................................................................................................................................... 22 Technical Specification............................................................................................................................. 22 DC/DC Converter, 24V in, 12V 8A out (13-003011) ............................................................................... 23 Description ............................................................................................................................................... 23 Technical Specification............................................................................................................................. 23 Channel Control Module (17-002101) ...................................................................................................... 24 Description ............................................................................................................................................... 24 Technical Specification............................................................................................................................. 24 VHF/ UHF Programming Procedure....................................................................................................... 25 VHF/ UHF Programming Example.......................................................................................................... 26 Channel Selective Module (17-009106)..................................................................................................... 27 Description ............................................................................................................................................... 27 Drg. Nō. 17-003080, Generic Channel Module Block Diagram.............................................................. 28 24V Relay Board (20-001602).................................................................................................................... 29 Description ............................................................................................................................................... 29 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-2 of 40 4.9.2 Technical Specification............................................................................................................................. 29 4.10 Six-Way Splitter (93-100004)..................................................................................................................... 30 4.10.1 Description ........................................................................................................................................... 30 4.10.2 Technical Specification......................................................................................................................... 30 4.11 STPS12045TV 60A Dual Diode Assembly (94-100004)........................................................................... 30 4.11.1 Description ........................................................................................................................................... 30 4.12 JWS100-12/A PSU (96-300051) ................................................................................................................. 31 4.12.1 Description ........................................................................................................................................... 31 4.12.2 Technical Specification......................................................................................................................... 31 4.13 24V, 400W Power Supply Pack (96-300054) ............................................................................................ 32 4.13.1 Description ........................................................................................................................................... 32 4.13.2 Technical Specification......................................................................................................................... 32 5. 5.1 5.2 5.3 6. INSTALLATION .............................................................................................................................33 Initial Installation Record.......................................................................................................................... 33 Antenna Installation & Gain Calculations ............................................................................................... 33 Antenna Isolation........................................................................................................................................ 34 MAINTENANCE .............................................................................................................................35 6.1 General Procedures .................................................................................................................................... 35 6.1.1 Fault Finding............................................................................................................................................ 35 6.1.2 Downlink................................................................................................................................................... 36 6.1.3 Uplink ....................................................................................................................................................... 36 6.1.4 Fault repair............................................................................................................................................... 36 6.1.5 Checking service....................................................................................................................................... 37 6.1.6 Service Support......................................................................................................................................... 37 6.2 Tools & Test Equipment ............................................................................................................................ 37 6.3 Care of Modules.......................................................................................................................................... 38 6.3.1 General Comments ................................................................................................................................... 38 6.3.2 Module Removal (LNA’s, general procedure): ........................................................................................ 38 7.3.3 Module Replacement (general): ............................................................................................................... 38 6.3.4 Power Amplifiers ...................................................................................................................................... 38 6.3.5 Low Power Amplifier Replacement .......................................................................................................... 39 6.3.6 Module Transportation: ........................................................................................................................... 39 APPENDIX A INITIAL EQUIPMENT SET-UP CALCULATIONS.................................................40 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-3 of 40 AMENDMENT LIST RECORD SHEET Issue Nō. Date 29/03/05 Incorporated by CMH Page No.’s Amended Reason for new issue 1st Draft 1st Issue CMH Document Ref:-50-122501HBK 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-4 of 40 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 AFL recommends that the installer of this equipment familiarise his/herself with the safety and installation procedures contained within this document before installation commences. The purpose of this handbook is to provide the user/maintainer with sufficient information to service and repair the equipment to the level agreed. Maintenance and adjustments to any deeper level must be performed by AFL, normally at the company’s repair facility in Chesham, England. This handbook has been prepared in accordance with BS 4884, and AFL’s Quality procedures, which maintain the company’s registration to BS EN ISO 9001:2000 and to the R&TTE Directive of the European Parliament. Copies of the relevant certificates and the company Quality Manual can be supplied on application to the Quality Manager. This document fulfils the relevant requirements of Article 6 of the R&TTE Directive. Limitation of Information Notice This manual is written for the use of technically competent operators/service persons. No liability is accepted by AFL for use or misuse of this manual, the information contained therein, or the consequences of any actions resulting from the use of the said information, including, but not limited to, descriptive, procedural, typographical, arithmetical, or listing errors. Furthermore, AFL does not warrant the absolute accuracy of the information contained within this manual, or it’s completeness, fitness for purpose, or scope. AFL has a policy of continuous product development and enhancement, and as such, reserves the right to amend, alter, update and generally change the contents, appearance and pertinence of this document without notice. All AFL products carry a twelve month warranty from date of shipment. The warranty is expressly on a return to base repair or exchange basis and the warranty cover does not extend to on-site repair or complete unit exchange. 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-5 of 40 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. A Cell Enhancer, designed for operation on specified channel(s) within a specified frequency band. Channel frequencies may be factory set or on-site programmable. Base Transceiver Station Carrier-to-Noise Ratio RF signals transmitted from the BTS and to the MS RF signals transmitted from the MS to the BTS Electromagnetic Compatibility Ground Direct Current Alternating Current Identification Number Output Third Order Intercept Point = RFout +(C/I)/2 Light Emitting Diode Mobile Station Not Applicable No Connection Noise Figure Radio Frequency Receiver Transmitter Serial Number 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-6 of 40 Key to AFL RF Module Drawing Symbols 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-7 of 40 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. Whilst ever potentially present in any electrical equipment, such a condition would be minimised by quality installation practice and thorough testing at: a) Original assembly b) Commissioning c) Regular intervals, thereafter. All test equipment to be in good working order prior to its use. High current power supplies can be dangerous because of the possibility of substantial arcing. Always switch off during disconnection and reconnection. 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-8 of 40 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. This would always be a wise precaution, despite the severe mismatch between the impedance of an N type connector at 50Ω, and that of free space at 377Ω, which would severely mitigate against the efficient radiation of RF power. Radio frequency burns could also be a hazard, if any RF power carrying components were to be carelessly touched! Antenna positions should be chosen to comply with requirements (both local & statutory) regarding exposure of personnel to RF radiation. When connected to an antenna, the unit is capable of producing RF field strengths, which may exceed guideline safe values especially if used with antennas having appreciable gain. In this regard the use of directional antennas with backscreens and a strict site rule that personnel must remain behind the screen while the RF power is on, is strongly recommended. Where the equipment is used near power lines, or in association with temporary masts not having lightning protection, the use of a safety earth connected to the case-earthing bolt is strongly advised. 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-9 of 40 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). They are marked as hazardous in line with international regulations, but pose no threat under normal circumstances. Only if a component containing beryllium oxide has suffered catastrophic failure, or exploded, will there be any danger of the formation of dust. Any dust that has been created will be contained within the equipment module as long as the module remains sealed. For this reason, any module carrying the yellow and black danger sign should not be opened. If the equipment is suspected of failure, or is at the end of its life-cycle, it must be returned to Aerial Facilities Ltd for disposal. To return such equipment, please contact the Quality Department, who will give you a Returned Materials Authorisation (RMA) number. Please quote this number on the packing documents, and on all correspondence relating to the shipment. PolyTetraFluoroEthylene, (P.T.F.E.) and P.T.F.E. Composite Materials Many modules/components in AFL equipment contain P.T.F.E. as part of the RF insulation barrier. This material should never be heated to the point where smoke or fumes are evolved. Any person feeling drowsy after coming into contact with P.T.F.E. especially dust or fumes should seek medical attention. 1.5 Emergency Contact Numbers The AFL Quality Department can be contacted on: Telephone Fax e-mail +44 (0)1494 777000 +44 (0)1494 777002 qa@aerial.co.uk 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-10 of 40 2. OVERVIEW/SYSTEM DESCRIPTION The AFL Channel Selective Cell Enhancer is a 2-way on-band repeater. Various models are available to cover frequency bands from 50MHz to 3000MHz. Its main sphere of applications is in urban areas where the topology is such that shadows occur in the propagation pattern (for example within large buildings, conference centres and tunnels, etc.,) The Channel Selective Cell Enhancer is a 2-port device for direct connection to two antennas, usually a highly directional Yagi or similar aligned towards the base (donor) site and an omni-directional antenna to cover the mobiles. The frequency bands that are passed by the Cell Enhancer are set as per the specific customer requirements. AFL manufacture a wide range of Cell Enhancers, configured for each customer's specific requirements. Two basic physical variants are available, a rack mounted version to fit in a standard 19" rack and an environmentally sealed wall mounted version which requires no further enclosure. The rack-mounted version is usually supplied in 3 units, a power supply unit and 2 RF units (one containing each path). Each shelf/tray unit containing active modules has a ‘D.C. on’ indicator on the front panel and the PSU also has an ‘A.C. on’ indicator. The wall-mounted version is supplied in a single environmentally-protected case. Handles are provided for carrying the unit and the door is fitted with locks. A supply isolator switch is fitted inside the unit and there are ‘.DC. on’ and ‘Alarm on’ indicators on the outside of the door. 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-11 of 40 3. SPECIFICATION 3.P Cell Enhancer Case Internal Photograph 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-12 of 40 3.1 Description The system consists of separate modules mounted within a lockable, environmentally protected enclosure. It is designed to amplify twelve bi-directional channels (six uplink, six downlink) of mobile signals operating in the VHF waveband. All twelve channel selective modules are configurable for any frequency (within the channel modules’ designed range) set by the DIP switches on the channel control modules – see section 4.8 for channel frequency calculation examples. Alarms are provided for each amplifier and channel selective module which are wired as a volt-free, relay isolated summary loop, terminating at pins 1 & 2 in the external connector. The ‘normal’ condition is that each active device ‘holds’ a local relay closed, (so if power fails, the alarms become active) making a fail-safe system. 3.2 Electrical Specification PARAMETER SPECIFICATION Frequency range: 167.0-172MHz (Downlink) 162.0-165MHz (Uplink) Channel module frequencies: Unspecified Bandwidth: 3MHz uplink 5MHz downlink Channel ripple: <±1.5dB Gain: >95dB Gain Adjustment: 0 - 30dB (in 2dB steps) Spurious noise (in-band 30kHz): <-13dBm (U/L & D/L) Uplink Power: >10.0Watts Downlink Power: >40.0Watts DownlinkO/P power/channel: +24dBm UplinkO/P power/channel: +18dBm Channel module gain: 30dB -15.5dBm (downlink) Channel module ALC: -14dBm (uplink) +44dBm (downlink) PA 1 dB compression point: +38dBm (uplink) +56dBm (downlink) PA IP3: +50dBm (uplink) Noise Figure: <6dB VSWR: better than 1.5:1 RF Connectors: N type, female Input supply power: 110 or 230V ac operational: -10°C to +60°C Temperature range: storage: -40°C to +70°C Alarms Fitted: 1 Amplifiers (volt-free contacts/TTL) 2 Channel modules 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-13 of 40 3.3 Mechanical Specification Height: 800mm Case Size: Width: 600mm Depth: 250mm (excluding heatsinks, connectors, handles and feet) Fixings: 4 holes on 630(w) x 640(h)mm Weight: 80kg (approximately) RF Connectors: N type female Environmental Protection: IP65 with door closed and ports terminated Case: To RAL 7035 Finish: Heatsinks: Matt black Handles: Black technopolymer operational: -20°C to +60°C Temperature Range: storage: -40°C to +70°C Unit supplied with 3-pin IP68 connector for Supply cord: customer interface with AC input. 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-14 of 40 3.4 System Diagram, Drg. Nō. 50-122580 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-15 of 40 3.5 Generic System Case Outline Drawing 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-16 of 40 3.5 Parts List AFL Part Nō. 05-000103 05-000104 10-000703 11-006002K 12-002001K 12-003601K 13-003011 13-003020 17-000526 17-002101 17-002103 17-003022 17-003023 17-003024 17-003025 17-003028 17-003029 17-009106 20-001602 80-031820 80-310420 91-030002 91-130001 91-800027 91-800028 91-800029 92-120009 93-970016 94-100004 96-100006 96-110057 96-300051 96-300054 96-700034 96-700035 96-900018 97-100109 97-400010 97-600001 97-600002 97-900004 99-200017 Part Description TX HYBRID COUPLER 3 PORT NO HTSINK TX HYBRID COUPLER 3 PORT W/HEATSINK 1/4W0-30dB SWITCHED ATTENUATOR LNA VHF 70-500MHz KIT PWR AMP 10W 100-250MHz SMA KIT POWER AMP.150MHz 20W KIT DC/DC CONVERTER.18-36in 12v out 8.3A DC/DC CONVERTER 24-12V HEATSINK CE 10/20W HEATSINK THERMAL GASKET CHANNEL CONTROL MODULE 26WAY RIBBON CABLE LEAD MODULE PATTERNED LEAVE SUBRACK SIDE PANEL SUBRACK REAR BRACKET BOTTOM MODULE GUIDE MODULE SQUARE LEAVE TOP MODULE GUIDE 160MHz VHF CHAN MOD, 30kHz (8p) 24V RELAY BOARD 20W PA HEATSINK BCC 400W POWER SUPPLY HEATSINK N ADAPTOR PANEL FEMALE:FEMALE SMA ADAPT 'T' ALL FEMALE 3 GHz DIN RAIL NON-FUSED TERMINAL BLOCK DIN RAIL END-STOP DIN RAIL TERMINAL BLOCK PARTITION M20 IP68 CABLE GLAND 6 WAY SPLITTER 1-500MHz SMA STPS12045TV 60A DUAL DIODE FUSE HOLDER ATO IN-LINE 25A ATO FUSE JWS100-12/A PSU 24V 17A PSU 400W (XP BCC) LED RED 5mm IP67 LED GREEN 5mm IP67 AC TRIP SWITCH (5 AMP M.C.B.) CASE 800 x 600 x 250 SAREL(FEC 650-754) BLACK PLASTIC HANDLE 50mm HIGH SUBRACK FRONT HORIZ SUBRACK M2.5 STD TAP RUBBER FOOT FOR CELL ENHANCERS CAUTION HEAVY LABEL 75 x 55mm Qty. 12 12 12 12 12 12 12 24 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-17 of 40 4. SUB-UNIT MODULES 4.1 4.1.1 3 Port Tx Hybrid Couplers (05-000103 & 05-000104) Description The transmitter hybrid couplers provide isolation from unwanted reflected frequencies to/from the leaky feeder antennas. They are 4 port devices with the one unused port terminated internally with a 50 Ω dummy load. The ‘104’ version has higher power capability due to an attached heatsink. Being passive devices, the hybrid couplers should be maintenance free over their entire lifetime and have an extremely high MTBF figure. It is not recommended that the top cover be removed or any of the internal components needlessly touched, since the original factory alignment/tuning would be extremely hard to reproduce in a ‘field’ environment. 4.1.2 Technical Specification PARAMETER Frequency Range: Bandwidth: Insertion Loss: Impedance: V.S.W.R: Input to input isolation: Connectors: Dimensions: SPECIFICATION 140-170 MHz ±10% of fo 3.2dB 50Ω 1.2:1 >20dB Type N Standard 140 x 120 x 35mm 25Watts (05-000103) Power rating: 100W (05-000104) Weight: 0.5kg 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-18 of 40 4.2 4.2.1 ¼Watt 0- -30dB Switched Attenuator (10-000703) 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. 4.2.2 Switched Attenuators The AFL switched attenuators are available in two different types; 0 – 30dB in 2 dB steps (as in this case), or 0 – 15dB in 1 dB steps. The attenuation is simply set using the four miniature toggle switches on the top of each unit. Each switch is clearly marked with the attenuation it provides, and the total attenuation in line is the sum of the values switched in. They are designed to maintain an accurate 50Ω impedance over their operating frequency at both input and output. 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-19 of 40 4.3 4.3.1 VHF/UHF Low Noise Amplifier (11-006002) Description The 21dB gain low noise amplifier used is a double stage solid-state low-noise amplifier. Class A circuitry is used throughout the unit to ensure excellent linearity over a very wide dynamic range. The two active devices are very moderately rated to provide a long, troublefree working life. There are no adjustments on this amplifier, and in the unlikely event of failure then the entire amplifier should be replaced. The amplifier features a dedicated, inbuilt alarm monitoring system based on class A DC biasing levels whose output is a volts-free relay contact pair that may be integrated into an existing system via the 9-way D-type interface. 4.3.2 Technical Specification PARAMETER Frequency range: Bandwidth: Gain: 1dB Compression Point: 3rd order intercept: Input return loss: Output return loss: VSWR: Noise figure: Connectors: Supply: Size: operational: Temperature range: storage: Weight: 4.3.3 SPECIFICATION 70 – 500MHz <430MHz 21dB (typical) +20dB (typical) +33dB (typical) >14dB >20dB Better than 1.5:1 <2.7dB SMA female 230 - 260mA @ 10 to 24V DC 88 x 50 x 34mm (ex. connectors) -10°C to +60°C -20°C to +70°C 0.26kg LNA ‘D’ Connector Pin-out details Connector pin Signal +Ve input (10-24V) GND Alarm RelayO/P bad Alarm Relay common Alarm Relay good No connection TTL voltage set TTL alarm/0V (good) O/C good/0V bad 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-20 of 40 4.4 4.4.1 10Watt Power Amplifier (12-002001) 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. Under no circumstances should the cover be removed or the side adjustments disturbed unless it is certain that the amplifier has failed; since it is critically aligned during manufacture and any re-alignment will require extensive test equipment. 4.4.2 Technical Specification PARAMETER Frequency range: Bandwidth: Maximum RF output: Gain: 1dB compression point: 3rd order intercept point: VSWR: Connectors: Supply: Weight: operational: Temperature range: storage: SPECIFICATION 100 - 250MHz (tuned to spec.) 20MHz (typical, tuned to spec.) >10Watts >50dB +40dBm +50dBm better than 1.5:1 SMA female 2.5Amps @ 24V DC 1kg (excluding heatsink) -10°C to +60°C -20°C to +70°C 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-21 of 40 4.5 20Watt Power Amplifier (12-003601) 4.5.1 Description The 20Watt 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. Under no circumstances should the cover be removed or the side adjustments disturbed unless it is certain that the amplifier has failed; since it is critically aligned during manufacture and any re-alignment will require extensive test equipment. 4.5.2 Technical Specification PARAMETER Frequency Range: Bandwidth: Maximum Output Power: Gain: 1dB Compression Point: 3rd Order Intercept Point: VSWR: Connectors: Supply: operational: Temperature range: storage: Size: Weight: SPECIFICATION 88 - 108MHz 20MHz (typical, tuned to spec.) >20W 44dB <+43dBm <+54dBm better than 1.45:1 SMA female 4.8A @ 24V DC -10°C to +60°C -20°C to +70°C 276 x 78 x 40mm (case only) 1.5 kg (excluding heatsink) 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-22 of 40 4.6 4.6.1 DC/DC Converter, 24V in, 12V 8A out (13-003011) Description The DC/DC converter fitted is an O.E.M high power PCB unit with an 8 amp @ 12V output capability. The regulator exists within this unit because of the need to supply 12V DC to the channel modules; if the unit is being supplied with power by the external 24V DC rail, there would be only be 24V in the system and the channel modules would have no power. The circuit is basically an O.E.M semiconductor regulator (one side of which has a heatsink mounting plate, usually bolted to the casing of a Cell Enhancer) and smoothing components built onto a printed circuit board with screw block terminations. Note: no circuit diagram of this O.E.M. regulator is available. This unit should not be repaired, only replaced. 4.6.2 Technical Specification PARAMETER Input Voltage Range: Output Voltage: Max. Current Load: operation Temperature range: storage: Size(PCB): Weight (Loaded PCB): SPECIFICATION 18-28V DC 12V±0.5V 8.0Amps -10°C to +60°C -20°C to +70°C 190 x 63mm 291gms 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-23 of 40 4.7 4.7.1 Channel Control Module (17-002101) Description The purpose of the channel control modules is to change the channel selective module frequencies by means of a series of D.I.P switch banks, each switch corresponding to a different ‘frequency bit’. 4.7.2 Technical Specification Below shows the pin assignments for each switch on a channel control module. IDC PIN 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 21 20 19 18 17 16 15 14 --- Function 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 (25.6MHz) Freq. bit 13 (51.2MHz) Freq. bit 14 (102.4MHz) Freq. bit 15 (204.8MHz) Freq. bit 16 (409.6MHz) Module alarm N/C +5V 0V Switched 12V 0V --- 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-24 of 40 4.7.3 VHF/ UHF 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). If the synthesiser division ratio is not an integer value, check the required operational frequency and repeat the calculation checking for mistakes. Convert the required local oscillator frequency to synthesiser programming switch state patterns according to the following table. Switch number 10 11 12 13 14 15 16 Synthesiser offset added when switch in UP position +12.5kHz +25kHz +50kHz +100kHz +200kHz +400kHz +800kHz +1.6MHz +3.2MHz +6.4MHz +12.8MHz +25.6MHz +51.2MHz +102.4MHz +204.8MHz +409.6MHz 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-25 of 40 4.7.4 VHF/ UHF Programming Example Frequency required: 465.5MHz Channel spacing: 12.5kHz Synthesiser offset: 21.4MHz The Local Oscillator frequency is therefore: 465.4 – 21.4 Dividing the LO frequency by the channel spacing of: = 444.0 MHz 0.0125MHz: 444.0 = 35520 0.0125 This is an integer value, therefore it is OK to proceed. Local Oscillator Frequency of: 444.0 MHz Switch setting: Switch settings 16 15 14 13 12 11 10 0 0 0 1 0 1 0 = switch 1 = switch DOWN UP (on, frequency ignored) (off, frequency added) 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-26 of 40 4.8 4.8.1 Channel Selective Module (17-009106) 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. The Channel Selectivity Module is an Up/Down frequency converter that mixes the incoming channel frequency with a synthesised local oscillator, so that it is down-converted to an Intermediate Frequency (IF) in the upper HF range. An eight pole crystal filter in the IF amplifier provides the required selectivity to define the operating passband of the Cell Enhancer to a single PMR channel. The same local oscillator then converts the selected IF signal back to the channel frequency. Selectivity is obtained from a fixed bandwidth block filter operating at an intermediate frequency (IF) in the low VHF range. This filter may be internal to the channel selectivity module (Crystal or SAW filter) or an externally mounted bandpass filter, (LC or Helical Resonator). Various IF bandwidths can therefore be accommodated. A synthesized Local Oscillator is employed in conjunction with high performance frequency mixers, to translate between the signal frequency and IF. The operating frequency of each channel selectivity module is set by the programming of channel selectivity module frequencies and is achieved digitally, via hard wired links, banks of DIP switches, or via an onboard RS232 control module, providing the ability to remotely set channel frequencies. Automatic Level Control (ALC) is provided within each channel selectivity module such that the output level is held constant for high level input signals. This feature prevents saturation of the output mixer and of the associated amplifiers. Alarms within the module inhibit the channel if the synthesised frequency is not locked. The synthesiser will not usually go out of lock unless a frequency far out of band is programmed. The channel selectivity module is extremely complex and, with the exception of channel frequency programming within the design bandwidth, it cannot be adjusted or repaired without extensive laboratory facilities and the necessary specialised personnel. If a fault is suspected with any channel selectivity module it should be tested by substitution and the complete, suspect module should then be returned to AFL for investigation. Operators note: None of the channel modules is frequency pre-programmed, they must all be set using the method described in section 4.8. 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-27 of 40 4.8.2 Drg. Nō. 17-003080, Generic Channel Module Block Diagram 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-28 of 40 4.9 24V Relay Board (20-001602) 4.9.1 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. It’s common use is to amalgamate all the alarm signals into one, volts-free relay contact pair for the main alarm system. Note that the board is available for different voltages (12 or 24V) depending on the type of relays fitted at RL1 and RL2. 4.9.2 Technical Specification PARAMETER SPECIFICATION Operating voltage: 8 to 30V (floating earth) Alarm Threshold: Vcc - 1.20 volt +15% Alarm output relay contacts: Max. switch current: 1.0Amp Max. switch volts: 120Vdc/60VA Max. switch power: 24W/60VA Min. switch load: 10.0µA/10.0mV Relay isolation: 1.5kV Mechanical life: >2x107 operations Relay approval: BT type 56 Connector details: Screw terminals operational: :-10°C to +55°C Temperature range storage: :-40°C to +70°C 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-29 of 40 4.10 Six-Way Splitter (93-100004) 4.10.1 Description The wide range, low power, hybrid splitter/combiner provides the means to divide the signal into six before the channel modules & re-combine the six signals into one after processing. Being passive devices, the receivers should be maintenance free over their entire lifetime and have an extremely high MTBF figure. It is not recommended that the top cover be removed should the unit be suspected of failure, replacement with a new unit is usually the most cost effective solution. 4.10.2 Technical Specification PARAMETER Frequency Range: Rx/Rx Isolation: Typical Insertion Loss: VSWR: Impedance: Output Connectors: Input Connectors: Temperature operation: range storage: Dimensions: 4.11 SPECIFICATION 50-500MHz >20dB 10.5 dB 1.3:1 50Ω N Type N Type / BNC -10°C to +60°C -20°C to +70°C 145 x 64 x 37mm (case only) STPS12045TV 60A Dual Diode Assembly (94-100004) 4.11.1 Description The purpose of these dual diode assemblies is to allow two (or more) DC voltage sources to be combined, so that the main 24 volt DC rail within the equipment is sourced from either the mains driven SMPU, or externally through an XLR connector on the rear panel. When the DC is sourced externally, the heavy-duty diodes prevent any reverse current from flowing back to their source or the alternative supply rail. Combining diodes such as these would also be used if the equipment is to be powered from external back-up batteries. 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-30 of 40 4.12 JWS100-12/A PSU (96-300051) 4.12.1 Description The mains power supply unit used to power the channel selective modules is a switchedmode type capable of supplying 12V DC at 8.5Amps continuously, (the cell enhancer draws approximately 5.0Amps from this 12V supply under normal conditions). 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 12.2V. The output voltage may be varied using the multi-turn adjustment potentiometer mounted close to the DC output terminals. All the PSU’s used in AFL Cell Enhancers are capable of operation from either 110 or 220V nominal AC supplies. The line voltage is sensed automatically, so no adjustment or link setting is needed by the operator. 4.12.2 Technical Specification AC Input Supply: Voltage: 110 or 220V nominal 90 to 132 or 180 to 264V (absolute limits) Frequency: 47 to 63Hz DC Output Supply: Voltage: 12V DC (nominal) 10-14V (absolute limits) Current: 8.5A 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-31 of 40 4.13 24V, 400W Power Supply Pack (96-300054) 4.13.1 Description The main 24V power supply unit is a switched-mode type capable of supplying 24V DC at 17.0Amps continuously. Equipment of this type typically requires approximately 12.0 Amps at 24V 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 24.5V using the multi-turn potentiometer mounted close to the DC output studs on the PSU PCB. All the PSU’s used in AFL Cell Enhancers are capable of operation from either 110 or 220V nominal AC supplies. The line voltage is sensed automatically, so no adjustment or link setting is needed by the operator. 4.13.2 Technical Specification Voltages: Frequency: Voltage: Maximum current: AC Input Supply 110 or 220V nominal 90 to 132 or 180 to 264V (absolute limits) 47 to 63Hz DC Output Supply: 24V DC (nominal) 20 to 28V (absolute limits) 17A 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-32 of 40 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. 5.2 Antenna Installation & Gain Calculations 1 Most Cell Enhancer require two antennas, one a highly directional Yagi or similar directed towards the donor cell base station, and one a leaky feeder, omni-directional antenna or Yagi to cover the area in which the mobiles are to be served. 2 The maximum gain at which the Cell Enhancer can be set is limited by the isolation that can be achieved between these two antennas. Therefore when the antennas have been installed, inject a signal (at a known power level) into one of them and measure the signal level received by the other antenna on a spectrum analyser. The isolation can then be calculated as the difference between these two figures. The gain in each path of the Cell Enhancer should be set at least 10 dB below this figure, using attenuators as described below in paragraph 5. 3 Also measure the received signal from the donor cell at the input to the Cell Enhancer (base port). The gain of the Cell Enhancer downlink path should be set such the donor site will not overload the Cell Enhancer amplifiers. It is recommended that the input level should be less than -50dBm at the input of the Cell Enhancer (Base Port). (This figure is assuming maximum gain, and may be increased by the value of the attenuator fitted in the downlink path.) 4 Ensure that the mobile facing antenna has at least 70 dB isolation from the nearest mobile. (This is usually easily achieved when using a leaky feeder.) 5 The Cell Enhancer gain is set by setting the attenuation in each path (uplink and downlink) between the first two amplifier stages (see markings within the Cell Enhancer or layout drawings for the exact attenuator locations). Note that the uplink (mobile to base) and downlink (base to mobile) path gains are set independently. This allows the paths to have different gains if required to set the correct output power levels. 6 It is recommended that the gains are set such that the Downlink channel output levels from the Cell Enhancer are typically +30dBm per channel (Input level + Gain = Output level). 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-33 of 40 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 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-34 of 40 6. MAINTENANCE 6.1 6.1.1 General Procedures Fault Finding In the event that the performance of the system is suspect, a methodical and logical approach to the problem will reveal the cause of the difficulty. The System consists of modules within a wall mounted, environmentally protected enclosure Transmissions from the main base stations are passed though the system to the mobile radio equipment; this could be a handheld radio or a transceiver in a vehicle. This path is referred to as the downlink. The return signal path from the mobile radio equipment to the base station is referred to as the uplink. The first operation is to check the alarms of each of the active units and determine that the power supplies to the equipment are connected and active. This can be achieved remotely (via CEMS, the RS232 Coverage Enhancement Management System, if fitted), or locally with the front panel LED’s. The green LED on the door should be illuminated, while the red alarm indicator should be off. If an Alarm is on, then that module must be isolated and individually tested against the original test specification. Note that channel modules will alarm if their channel frequency (set by the channel controller DIP switches) is set to a non-valid frequency. The individual amplifier units within the unit have a green LED showing through a hole in their lid, which is illuminated if the unit is working correctly. If an amplifier is suspect, check the DC power supply to the unit. If no other fault is apparent use a spectrum analyser to measure the incoming signal level at the input and then after reconnecting the amplifier input, measure the output level. Consult with the system diagram to determine the expected gain and compare result. In the event that there are no alarms on and all units appear to be functioning it will be necessary to test the system in a systematic manner to confirm correct operation. 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-35 of 40 6.1.2 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. The expected downlink output for the given input can be found in the end-to-end test specification. 6.1.3 Uplink Testing the uplink involves a similar procedure to the downlink except that the frequencies used are those transmitted by the mobile equipment. 6.1.4 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. The repair of component modules such as amplifiers and bandpass filters will not usually be possible in the field, as they frequently require specialist knowledge and test equipment to ensure correct operation. It is recommended that items of this type are replaced with a spare unit and the faulty unit returned to AFL for repair. 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-36 of 40 6.1.5 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. 6.1.6 Service Support Advice and assistance with maintaining and servicing this system are available by contacting Aerial Facilities Ltd. 6.2 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: Hand tools: 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. SMA male – N male, 1m long RG223. Philips #1&2 tip screwdriver. 3mm flat bladed screwdriver. SMA spanner and torque setter. 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-37 of 40 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. 6.3.2 Module Removal (LNA’s, general procedure): The following general instructions should be followed to remove a module: Remove power to the unit Remove all visible connectors (RF, DC & alarm) Release module retaining screws. Slowly but firmly, pull the module straight out of its position. Take care not to twist/turn the module during withdrawal. (When the module is loose, care may be needed, as there may be concealed connections underneath). 7.3.3 Module Replacement (general): Carefully align the module into its location then slowly push the module directly straight into its position, taking care not to twist/turn it during insertion. Reconnect all connectors, RF, alarm, power etc.,(concealed connectors may have to be connected first). Replace retaining screws (if any). Double-check all connections before applying power. 6.3.4 Power Amplifiers 1) Remove power to the unit. (switch off @ mains/battery, or remove DC in connector) 2) Remove alarm wires from alarm screw terminal block or disconnect multi-way alarm connector. 3) Carefully disconnect the RF input and output coaxial connectors (usually SMA) If alarm board removal is not required, go to step 5. 4) There is (usually) a plate attached to the alarm board which fixes it to the amplifier, remove its retaining screws and the alarm board can be withdrawn from the amplifier in its entirety. On certain types of amplifier the alarm board is not mounted on a dedicated mounting plate; in this case it will have to firstly be removed by unscrewing it from the mounting pillars, in most cases, the pillars will not have not have to be removed before lifting the amplifier. 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-38 of 40 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., against a wall in the case of wall mounted enclosures), then the fixing method for the heatsink will be from within the case, (otherwise the enclosure would have to be removed from the wall in order to remove the heatsink). When the heatsink has been removed, the amplifier may be unscrewed from the main casing by its four corner fixings and gently withdrawn. Fitting a new power amplifier module will be the exact reverse of the above. Note: Do not forget to apply fresh heatsink compound to the heatsink/main case joint and also between the amplifier and the main case. 6.3.5 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. Remove the alarm monitoring wires from (D type connector) pins 9 and 10. 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. Reconnect the DC supply connector and turn the mains switch on. Note: Tighten SMA connectors using only a dedicated SMA torque spanner. If SMA connectors are over-tightened, irreparable damage will occur. . Do not use adjustable pliers to loosen/tighten SMA connectors. Also take care not to drop or knock the module as this can damage (or misalign in the case of tuned passive modules) sensitive internal components. Always store the modules in an environmentally friendly location 6.3.6 Module Transportation: To maintain the operation, performance and reliability of any module it must be stored and transported correctly. Any module not installed in a whole system must be kept in an antistatic bag or container. These bags or containers are normally identified by being pink or black, and are often marked with an ESD label. Any module sent back to AFL for investigation/repair must be so protected. Please contact AFL’s quality department before returning a module. 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-39 of 40 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 DOWNLINK CALCULATIONS Parameter Comments Input signal level (G) CE max. o/p power (E) Gain setting E-G Isolation required (Gain + 10dB) Service antenna gain (A) Service antenna feeder loss (C) Effective radiated power (ERP) E+A-C Attenuator setting CE gain-gain setting Value dBm dBm dB dB dB dB dBm dB If the input signal level in the uplink path is known and steady, use the following calculation table to determine the gain setting. If the CE features Automatic Gain Control the attenuator should be set to zero and if not, then the attenuation setting for both uplink and downlink should be similar. UPLINK CALCULATIONS Parameter Comments Input signal level CE max. o/p power (E) Gain setting Required isolation Donor antenna gain (B) Donor antenna feeder loss (D) Effective radiated power (ERP) E+B-D Attenuator setting (CE gain-gain setting) Value dBm dBm dB dB dB dB dBm dB 12 Channel Channelised Cell Enhancer User Handbook Handbook Nō.-50-122501HBK Issue No:-A Date:-16/03/05 Page:-40 of 40
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