Tetrapol Band Selective Repeater User Handbook For Coverage Solutions Corporation AFL Works Order Nō.:Q110695 AFL product part Nō.:55-124801 Tetrapol Band Selective Repeater User Handbook Handbook Nō.
Table of Contents AMENDMENT LIST RECORD SHEET....................................................................................................4 INTRODUCTION.........................................................................................................................................5 Scope ........................................................................................................................................................................... 5 Purpose ..........................
6. 6.1 6.2 6.3 6.4 7. INSTALLATION .............................................................................................................................24 Initial Installation Record.......................................................................................................................... 24 Antenna Installation & Gain Calculations ............................................................................................... 24 Antenna Isolation.....................................
AMENDMENT LIST RECORD SHEET Issue Nō. 1 Date 23/01/2004 Incorporated by CMH Page No.’s Amended Reason for new issue 1st Issue Document Ref:-55-124801HBKM Tetrapol Band Selective Repeater 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 AFL recommends that the installer of this equipment familiarise his/herself with the safety and installation procedures contained within this document before installation commences.
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 Tetrapol Band Selective Repeater User Handbook Handbook Nō.
1. SAFETY CONSIDERATIONS 1.1 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.
1.2 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 The AFL Band Selective Cell Enhancer is a 2-way on-band repeater. Various models are available to cover frequency bands from 50MHz to 3000MHz with power levels up to 100Watts. 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.
3. SPECIFICATION 3.1 Parts Lists AFL Part Nō. 02-007306 10-000701 11-007302 11-007401 11-007901 12-016302 13-001803 16-041401 17-000126 17-001101 17-001201 17-001520 17-001522 17-004730 55-019049 80-008902 80-031820 90-200004 90-400006 91-030002 91-500013 91-500015 91-500016 91-600001 91-600014 96-700034 96-700035 96-920011 96-920012 97-300028 97-400010 97-900003 99-200017 Part Description SDF C/L5P 380MHzVAR. >5MHz TOP SMA 1/4W0-30dB SWITCHED ATTENUATOR LNA. 380-500MHz 20dB (C/W RELAY) GA LNA.
3.2 Technical Specification PARAMETER SPECIFICATION Frequency range: 380-425MHz (Downlink) 390-435MHz (Uplink) Bandwidth: 45MHz Gain: >90dB Gain Adjustment: 0 – 15dB (in 1dB step) Uplink Power: >10Watts Downlink Power: >10Watts IP3: +52dBm 1dB Compression point: +40dBm Noise Figure: <5dB AGC: Fitted in Uplink path VSWR: better than 1.
3.
4. SYSTEM DRAWINGS System Diagram 4.1 Tetrapol Band Selective Repeater User Handbook Handbook Nō.
4.2 Generic Wall-Mount Case Outline Drawing Tetrapol Band Selective Repeater User Handbook Handbook Nō.
5. SUB-UNIT MODULES 5.1 Bandpass Filters & Duplexer (02-007306 & 16-041401) 5.1.1 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.
5.2 ¼Watt 0- -30dB Switched Attenuator (10-000701) 5.2.1 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. 5.2.2 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.
5.3.3 Technical Specification, 11-007402 PARAMETER Frequency range: Bandwidth: Gain: 1dB Compression Point: 3rd order intercept: Input/Output return loss: Noise figure: Connectors: Supply: Weight: Size: operation: Temperature range: storage: SPECIFICATION 380-500MHz <140MHz 30-32dB +22dBm (typical) +34-35dBm (typical) >20dB <1.3dB SMA female 300-330mA @ 24V DC <300gm 90 x 55 x 30.2 (case only) -10°C to +55°C -30°C to +70°C 5.4 1Watt Low Power Amplifier (11-007901) 5.4.
5.5 10W Power Amplifier (12-016302) 5.5.1 Description This amplifier is a Class A 10W power amplifier from 380MHz to 470MHz in a 1 stage balanced configuration. It demonstrates a very high linearity and a very good input/output return loss (RL). It has a built-in Current Fault Alarm Function. Its housing is an aluminium case (Alocrom 1200 finish) with SMA connectors for the RF input/output and a D-Type connector for the power supply and the Current Fault Alarm Function. 5.5.
5.6 Dual DC/DC Converter (13-001803) 5.6.1 Description This unit is employed where it is necessary to derive two fixed voltage power supply rails from some higher voltage. Typically it is used to derive 5, 8, 12 or 15V from a 24V input. The circuit is based upon a pair of LM257 series variable voltage regulators (LM2576, 12 & 15V & LM2575, 5V), which are each capable of supplying an absolute maximum of 1.5A output current.
5.7 Automatic Gain Control (17-001101, det. & 17-001201, atten.) 5.7.1 Description The equipment is fitted with an Automatic Gain Control (AGC) system. This is generally fitted in the Uplink path (not usually needed in the downlink path, as the signal here is at an almost constant level), to avoid overloading the amplifiers (with the associated performance degradation) should a mobile be operated very close to the unit.
For small signals, below AGC onset, the output control line will be close to 12V and the AGC attenuator will have minimum attenuation. As the signal level increases the control line voltage will fall, increasing the attenuator value and keeping the system output level at a constant value. The AGC onset level is adjusted by the choice of sampler resistor R1 and by the setting of potentiometer VR1. The attenuator comprises a 50Ω P.I.N diode, voltage-variable attenuator with a range of 3 to 30dB.
5.9 Generic Amplifier Alarm Wiring Sketch Tetrapol Band Selective Repeater User Handbook Handbook Nō.
6. INSTALLATION 6.1 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. 6.
6.3 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 Tetrapol Band Selective Repeater User Handbook Handbook Nō.
6.4 Wall Mount Installations The procedure for installing and commissioning a wall-mounted Bi-Directional Amplifier unit is generally as follows: 1 Fix the unit in the chosen position. Ensure the mounting site is a straight, smooth, dry, perpendicular surface (brick or concrete recommended). 2 Fix the two antennas and connect them to the BDA. 3 Connect a suitable mains and/or battery power supply to the unit.
7. MAINTENANCE 7.1 General Procedures 7.1.1 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.
7.1.2 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.
7.1.5 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. 7.1.6 Service Support Advice and assistance with maintaining and servicing this system are available by contacting Aerial Facilities Ltd. 7.
7.3 Care of Modules 7.3.1 General Comments Many of the active modules contain semiconductor devices utilising MOS technology, which can be damaged by electrostatic discharge. Correct handling of such modules is mandatory to ensure their long-term reliability. To prevent damage to a module, it must be withdrawn/inserted with care. The module may have connectors on its underside, which might not be visible to the service operative. 7.3.
5) If the amplifier to be removed has a heatsink attached, there may be several different ways it can have been assembled. The most commonly used method, is screws through the front of the heatsink to threaded screw holes (or nuts and bolts), into the amplifier within the main case. If the heatsink is mounted on the rear of the main case (e.g.
APPENDIX A INITIAL EQUIPMENT SET-UP CALCULATIONS GENERAL INFORMATION Client Name: AFL Equip. Model Nō. Site Name: Date: Model ANTENNA SYSTEMS Gain Azimuth Comments A - Service Antenna B – Donor Antenna Type Loss Length Comments 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.
