Aerial Facilities Limited Two Channel UHF Repeater For Inner Wireless Inc. AFL Works Order: Q115559 AFL product part #: 50-187601 Aerial Facilities Limited Technical Literature Handbook Number: 50-187601HBKM 2 Channel UHF Cell Enhancer Handbook Issue No.
Table of Contents 1. INTRODUCTION ............................................................................................................ 4 Scope and Purpose of Document.................................................................................................... 4 Limitation of Liability Notice ............................................................................................................ 4 2. SAFETY CONSIDERATIONS ................................................................
4.7 8A Mains Filter Assembly (13-003301) ............................................................................. 35 4.7.1 4.7.2 4.8 Channel Control Module (17-002101) ............................................................................... 36 4.8.1 4.8.2 4.8.3 4.8.4 4.9 Description .......................................................................................................................................36 Technical Specification ...............................................
1. INTRODUCTION Scope and Purpose of Document 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. This is a controlled release document and, as such, becomes a part of Aerial Facilities’ Total Quality Management System. Alterations and modification may therefore only be performed by Aerial Facilities Ltd.
2. SAFETY CONSIDERATIONS 2.1 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. 2.2 Electric Shock Hazard Electrical shocks due to faulty mains driven power supplies.
2.4 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).
3. EQUIPMENT OVERVIEW 3.
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Photographs continued............... View of R.H.S Ports & Earthing bolt View of L.H.
3.1 Description The cell enhancer is constructed within an environmentally protected case which may be either freestanding or (usually) permanently secured to a vertical wall.
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4. SUB-UNIT MODULES 4.1 Bandpass Filter (02-010201) 4.1.1 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.
4.2 Two-Way Splitter (07-002503) 4.2.1 Description This wideband, 2 way hybrid splitter, is an AFL stock item with many years of reliable service. The successful construction of such a device, relies largely on a PCB developed within a rigid specification, skilled assembly and testing. Insertion loss quoted is typical, any unit will be within 5% of this figure. 4.2.
Handbook Number: 50-187601HBKM CHKD Two Channel UHF Cell Enhancer User Handbook Page: 16 of 51 APPD 04/06/93 DATE AL L DIMENSIO NS ARE IN mm UNL ESS O THERWISE STATED DBS DRAWN 2. FIT ITEM NO DECIMAL PLACE ± 1mm O NE DECIMAL PLACE ± 0 .3 mm TWO DECIMAL PLACES ± 0 .1 mm TO L ERANCES * SCAL E THIS IS A PRO PRIETARY DESIG N O F AERIAL FACIL ITIES LTD. REPRO DUCTIO N O R USE O F THIS DESIG N BY O THERS IS PERMISSIBLE O NLY IF EXPRESSLY AUTHO RISED IN WRITING BY AERIAL FACIL ITIES LTD.
4.3 0.25Watt 0- -30dB Switched Attenuator (10-000703) 4.3.1 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. 4.3.2 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.
4.3.3 Switched Attenuator Assembly Drawing, Drg.
Handbook Number: 50-187601HBKM CHKD Two Channel UHF Cell Enhancer User Handbook Page: 19 of 51 APPD 25/06/93 DATE ALL DIMENSIONS ARE IN mm UNLESS OTHERWISE STATED DBS DRAWN RF IN 10-000702 10-000703 USED ON R7 470R R8 470R R9 470R SIGNIFY 50 ohm STRIPLINE. NO DECIMAL PLACE ± 1mm ONE DECIMAL PLACE ± 0.3mm TWO DECIMAL PLACES ± 0.1mm TOLERANCES SCALE THIS IS A PROPRIETARY DESIGN OF AERIAL FACILITIES LTD.
4.4 11-007302 & 11-007402 Low Noise Amplifiers 4.4.1 Description The low noise amplifiers used are double stage solid-state low-noise amplifiers. 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 these amplifiers, and in the unlikely event of a failure then the entire amplifier should be replaced.
4.4.
Handbook Number: 50-187601HBKM F E D C B A 11-007302 380-500MHz 20dB 10-24V DC ******** **/**/20** 0086 19 OUT IN 34 AFL IN 4 PLACES see note 2 28 see note 2 31 CHKD Two Channel UHF Cell Enhancer User Handbook Page: 22 of 51 APPD IB 9/7/02 DATE 1 ALL DIMENSIONS ARE IN mm UNLESS OTHERWISE STATED CB DBS DRAWN 2 NO DECIMAL PLACE ± 1mm ONE DECIMAL PLACE ± 0.3mm TWO DECIMAL PLACES ± 0.1mm TOLERANCES 3 SCALE THIS IS A PROPRIETARY DESIGN OF AERIAL FACILITIES LTD.
Handbook Number: 50-187601HBKM F E D C B A CHKD Two Channel UHF Cell Enhancer User Handbook Page: 23 of 51 APPD IB 5/7/02 DATE 1 ALL DIMENSIONS ARE IN mm UNLESS OTHERWISE STATED CB DBS DRAWN RF INPUT 1 51R R1 11303-3 C P L1 C4 1nF C3 3. 3pF 2 NO DECIMAL PLACE ± 1mm ONE DECIMAL PLACE ± 0.3mm TWO DECIMAL PLACES ± 0.1mm TOLERANCES - L4 3 S S SCALE 330nH D G Ø1. 6x6 t urns D L2 C LY 2 TR 2 C LY 2 1nF G TR 1 Ø1.
Handbook Number: 50-187601HBKM F E D C B A CHKD Two Channel UHF Cell Enhancer User Handbook Page: 24 of 51 APPD IB 8/7/02 DATE 1 ALL DIMENSIO NS ARE IN mm UNLESS O THERWISE STATED CB DBS DRAWN RF IN 1 5V 75 mA -ve 5V 75 mA -ve DC INPUT 3 2 NO DECIMAL PLACE ± 1 mm O NE DECIMAL PL ACE ± 0.3 mm TWO DECIMAL PLACES ± 0 .1 mm TO L ERANCES 3 SCALE THIS IS A PRO PRIETARY DESIG N O F AERIAL FACILITIES L TD.
Handbook Number: 50-187601HBKM F E D C B A CHKD A B V _IN 1 2 2 2 1 J3 J4 1 J5 J4 2 J1 1 2 J3 1 J5 1 J1 P1 J2 2 >12V DC I/P J2 + + C 13 10u 1u C4 ZD 3 5.
4.4.9 Drg.
4.4.10 Drg.
4.5 12-021601 5Watt Medium Power Tetra Amplifier 4.5.1 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.
4.5.5 5W TETRA PA Assembly Drawing, Drg.
4.5.6 5W TETRA PA Circuit Diagram, Drg.
4.6 12-022101 10Watt Power Tetra Amplifier 4.6.1 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.
4.6.3 PA 7-Way Connector Pin-Outs Connector Pin A1 (large pin) A2 (large pin) 1 2 3 4 5 Signal +12V DC GND Alarm relay common TTL alarm/0V good Alarm relay contact (bad) Alarm relay contact (good) O/C good/0V bad (TTL) 4.6.
4.6.5 10Watt PA Assembly Drawing, Drg.
4.6.6 10Watt PA Circuit Diagram, Drg.
4.7 8A Mains Filter Assembly (13-003301) 4.7.1 Description The AFL 10A mains filter assembly has been designed to remove mains-borne interference caused by external electrical radiation. Many filters exist which partially satisfy the criteria needed for cell enhancer power supplies (the main criteria being high continuous current) but a more cost efficient solution was realized using AFL’s own manufacturing capability. 4.7.
4.8 Channel Control Module (17-002101) 4.8.1 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’. 4.8.2 Technical Specification Below shows the pin assignments for each switch on a channel control module.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 +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 4.8.4 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 = 444.0 MHz Dividing the LO frequency by the channel spacing of: 0.0125MHz: 444.0 0.
4.9 Channel Selective Module (17-003007) 4.9.1 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.
4.9.2 Generic Channel Module Block Diagram, Drg.
4.10 12V Single Relay Board (80-008901) 4.10.1 Description The General Purpose Relay Board allows the inversion of signals and the isolation of circuits. It is equipped with a single dual pole change-over relay RL1, with completely isolated wiring, accessed via a 15 way in-line connector. The relay is provided with polarity protection diodes and diodes for suppressing the transients caused by "flywheel effect" which can destroy switching transistors or induce spikes on neighbouring circuits.
4.10.3 12 or 24V Relay PCB Pin-Outs, Drg.
4.11 12V Switch-Mode PSU (96-300052) 4.11.1 Description The power supply unit is a switched-mode type capable of supplying 12V DC at 12.5Amps continuously. This unit will draw approximately 7-8Amps at 12V DC, so the PSU’s will be used conservatively ensuring a long operational lifetime. No routine maintenance of the PSU’s 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.
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. 6. FAULT FINDING & MAINTENANCE 6.1 General Fault Finding Procedures 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.
6.2 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.
6.5 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. 6.6 Service Support Advice and assistance with maintaining and servicing this system are available by contacting Aerial Facilities Ltd. 6.
6.8 General Maintenance Procedures 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.
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. 6.12 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.
APPENDIX A Amendment List Record Sheet Issue No. Date A 22/05/2007 Incorporated by CMH Page Nos.
Glossary of Terms Repeater or Cell Enhancer A Radio Frequency (RF) amplifier which can simultaneously amplify and re-broadcast Mobile Station (MS) and Base Transceiver Station (BTS) signals. Band Selective Repeater A Cell Enhancer designed for operation on a range of channels within a specified frequency band. Channel Selective Repeater 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.
Key to AFL Drawing Symbols, Drg.
APPENDIX B Initial Equipment Set-Up Calculations General Information Site Name: Date: Client Name: AFL Equip. Model No. Antenna Systems Model Gain Azimuth Comments Type Loss Length Comments A - Service Antenna B – Donor Antenna 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 Input signal level (G) CE max.
