Axell Wireless 50 1272BDA User Manual
VHF Headstation Bi-Directional
and In-line Amplifiers
User Handbook
For
Motorola Alaska
AFL Works Order Nō.: Q112856
AFL product part Nō.: 50-127201 (Bi-Directional Amplifier)
50-127202 (In-Line Amplifier)
VHF Headstation & In-Line Amplifiers
Handbook Nō.-50-127201FCC Issue No:-A
Date:-14/06/2005
User Handbook
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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 Earthing of Equipment ................................................................................................................................ 8
1.2 Electric Shock Hazard.................................................................................................................................. 8
1.3 RF Radiation Hazard ................................................................................................................................... 9
1.4 Chemical Hazard ........................................................................................................................................ 10
1.5 Emergency Contact Numbers.................................................................................................................... 10
2. OVERVIEW/SYSTEM DESCRIPTION .......................................................................................11
3. VHF AMPLIFIERS .........................................................................................................................12
3.1 VHF Headstation Bi-Directional Amplifier ............................................................................................. 12
3.1.1 VHF Headstation Bi-Directional Amplifier Description.......................................................................... 12
3.1.2 VHF Headstation Bi-Directional Amplifier Electrical Specifications...................................................... 12
3.1.3 VHF Headstation Bi-Directional Amplifier Mechanical Specifications................................................... 13
3.1.4 VHF Headstation Bi-Directional Amplifier System Diagram .................................................................. 14
3.1.5 VHF Headstation Bi-Directional Amplifier Parts List .............................................................................15
3.2 VHF In-Line Amplifier Description.......................................................................................................... 17
3.2.1 VHF In-Line Amplifier Electrical Specifications...................................................................................... 17
3.2.2 VHF In-Line Amplifier Mechanical Specifications................................................................................... 18
3.2.3 VHF In-Line Amplifier System Diagram .................................................................................................. 19
3.2.4 VHF In-Line Amplifier Parts List ............................................................................................................. 20
4. SUB-UNIT MODULES....................................................................................................................22
4.1 Bandpass Filter (01-002503) ...................................................................................................................... 22
4.1.1 Description ............................................................................................................................................... 22
4.1.2 Technical Specification............................................................................................................................. 22
4.2 VHF 30dB Coupler (07-000108)................................................................................................................ 23
4.2.1 Description ............................................................................................................................................... 23
4.2.2 Technical Specification............................................................................................................................. 23
4.3 ¼Watt 0- -30dB Switched Attenuator (10-000701)..................................................................................24
4.3.1 Switched Attenuators ................................................................................................................................ 24
4.3.2 Remote Attenuators (10-001201).............................................................................................................. 24
4.4 VHF/UHF Low Noise Amplifier (11-006002)........................................................................................... 25
4.4.1 Description ............................................................................................................................................... 25
4.4.2 Technical Specification............................................................................................................................. 25
4.4.3 LNA ‘D’ Connector Pin-out details.......................................................................................................... 25
4.5 10Watt Power Amplifier (12-002001) ....................................................................................................... 26
4.5.1 Description ............................................................................................................................................... 26
4.5.2 Technical Specification............................................................................................................................. 26
4.6 3 Stage Amplifier Alarm Board (12-002201)............................................................................................ 27
4.6.1 Description ............................................................................................................................................... 27
4.6.2 Technical Specification............................................................................................................................. 28
4.7 Single DC/DC Converter (13-001710)....................................................................................................... 29
4.7.2 Technical Specification............................................................................................................................. 29
4.8 Automatic Gain Control (17-001101, det. & 17-001201, atten.)............................................................. 30
4.8.1 Description ............................................................................................................................................... 30
4.8.2 Technical Specification............................................................................................................................. 31
4.9 Controller/Monitor Board (17-006801) .................................................................................................... 32
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4.9.1 Description ............................................................................................................................................... 32
4.9.2 Drg. Nō. 17-006880, Controller/Monitor PCB Pin-Outs......................................................................... 33
4.10 24V Single Relay Board (80-008902) ........................................................................................................ 34
4.10.1 Description ........................................................................................................................................... 34
4.11 24V, 400W Power Supply Pack (96-300054)............................................................................................ 34
4.11.1 Description ........................................................................................................................................... 34
4.11.2 Technical Specification......................................................................................................................... 34
4.12 STPS12045TV 60A Dual Diode Assembly................................................................................................ 35
4.12.1 Description ........................................................................................................................................... 35
4.13 MT2834ZDXK 56kBPS Modem (96-800003)........................................................................................... 35
4.13.1 Description ........................................................................................................................................... 35
5. INSTALLATION & COMMISSIONING......................................................................................36
5.1 Initial Installation Record.......................................................................................................................... 36
5.2 Antenna Installation & Gain Calculations ............................................................................................... 36
5.3 Antenna Isolation........................................................................................................................................ 37
5.4 General Remarks........................................................................................................................................ 38
5.5 Electrical Connections................................................................................................................................ 38
5.6 RF Connections........................................................................................................................................... 38
5.7 RS232 Setup ................................................................................................................................................ 39
6. MAINTENANCE .............................................................................................................................40
6.1 General Procedures .................................................................................................................................... 40
6.1.1 Quick Fault Checklist ............................................................................................................................... 40
6.1.2 Fault Finding............................................................................................................................................ 40
6.1.3 Downlink................................................................................................................................................... 41
6.1.4 Uplink ....................................................................................................................................................... 41
6.1.5 Fault repair............................................................................................................................................... 41
6.1.6 Checking service....................................................................................................................................... 42
6.1.7 Service Support......................................................................................................................................... 42
6.2 Tools & Test Equipment ............................................................................................................................ 42
6.3 Care of Modules.......................................................................................................................................... 43
6.3.1 General Comments ................................................................................................................................... 43
6.3.2 Module Removal (LNA’s, general procedure): ........................................................................................ 43
6.3.3 Module Replacement (general): ............................................................................................................... 43
6.3.4 Power Amplifiers ...................................................................................................................................... 43
6.3.5 Low Power Amplifier Replacement .......................................................................................................... 44
6.3.6 Module Transportation: ........................................................................................................................... 44
APPENDIX A INITIAL EQUIPMENT SET-UP CALCULATIONS.................................................45
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AMENDMENT LIST RECORD SHEET
Issue
Nō.
Date Incorporated
by
Page No.’s
Amended
Reason for new issue
A 14/06/2005 CMH 1st Draft
Document Ref:-50-127201HBK
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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. 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.
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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.
AC Alternating Current
AGC Automatic Gain Control
BBU Battery Backup Unit
BTS Base Transceiver Station
CEMS Coverage Enhanced Management System
C/NR Carrier-to-Noise Ratio
DC Direct Current
Downlink (D/L) RF signals Tx from the BTS to the Master Site
FO Fibre Optic
GND Ground
ID Identification Number
LED Light Emitting Diode
LNA Low Noise Amplifier
LPA Low Power Amplifier
MOU Master Optical Unit
M.S. Mobile Station
MTBF Mean Time Between Failures
N/A Not Applicable
N/C No Connection
OFR On Frequency Repeater
OIP3 Output Third Order Intercept Point = RF
+(C/I)/2
out
PA Power Amplifier
RF Radio Frequency
RSA Receiver/Splitter Amplifier
Rx Receiver
S/N Serial Number
Tx Transmitter
Uplink (U/L) RF signals transmitted from the MS to the BTS
VSWR Voltage Standing Wave Ratio
WDM Wave division multiplex
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Key to AFL RF Module Drawing Symbols
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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.
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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.
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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 +44 (0)1494 777000
Fax +44 (0)1494 777002
e-mail qa@aerial.co.uk
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2. OVERVIEW/SYSTEM DESCRIPTION
The Headstation BDA and the In-Line amplifier equipment is designed to be air interfaced
towards the local BTS and provide a single output to an LCX antenna cable.
Automatic gain control in both paths (channel selective module in downlink path has
internal AGC) keeps the signal level from overloading the amplifiers should a mobile be
operated close to the LCX antenna.
Alarms are provided for each amplifier and these terminate in a RS232 compatible digital
PCB with an output suitable for an off-air modem (as in this case) or a local PC running a
suitable terminal emulation program. The RS232 PCB is also capable of varying the gain
in each path via remotely switchable 0-30dB attenuators. This is in addition to the 0-30dB
of attenuation which is available locally.
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3. VHF AMPLIFIERS
3.1 VHF Headstation Bi-Directional Amplifier
3.1.1 VHF Headstation Bi-Directional Amplifier Description
See section 2.
3.1.2 VHF Headstation Bi-Directional Amplifier Electrical Specifications
PARAMETER SPECIFICATION
Frequency range:
137-143MHz (Downlink)
154-156MHz (Uplink)
Uplink channel frequency: 155MHz ±0.75MHz
Passband ripple: ±1.5dB
Gain: >95dB
Gain Adjustment: 0 - 30dB (in 2dB steps)
Uplink Power: >10Watts
Downlink Power: >10Watts
Downlink OIP3: +50dBm
Uplink OIP3: +45dBm
Downlink 1dB compression point: +38dBm
Uplink 1dB compression point: +35dBm
In-Band Spurious noise: <-36dBm (30kHz B/W)
AGC:
Downlink: +37dBm
Uplink: +34dBm
Noise Figure: <6dB
VSWR: better than 1.5:1
RF Connectors: N type, female
Temperature range:
operational:
storage:
-10°C to +60°C
-40°C to +70°C
1 Amplifiers
Alarms Fitted:
(volt-free contacts/TTL)
2 PSU
3 Door Intrusion
4 Over temperature
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3.1.3 VHF Headstation Bi-Directional Amplifier Mechanical Specifications
Case size
Temperature range:
Environmental Protection:
Finish:
PARAMETER SPECIFICATION
Height:
Width:
Depth:
620mm
620mm
250mm
(excluding heatsinks, connectors, handles and feet)
Fixings:
Operational:
Storage:
Weight:
RF Connectors:
4 holes on 670(w) x 558(h)mm
-10°C to +60°C
-40°C to +70°C
>30kg (two-man-lift)
N type female
IP65 (with door closed and all ports terminated)
Case:
Heatsinks:
Handles:
Supply Cable:
Painted to RAL 7035
Matt black (where fitted)
Black technopolymer
Unit supplied with suitable supply input leads with
connector and appropriate length of cable
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3.1.4 VHF Headstation Bi-Directional Amplifier System Diagram
01-002603
12-002001
17-011402
dB
dB
dBdB
10-000703
dB
10-001201
17-001201
11-006002 11-006002 11-006002
10-001201
10-000703
12-002001
11-006002 11-006002
17-001101
01-002603
154-156MHz 154-156MHz155MHz(1.5MHz)
01-002603 01-002603 01-002603
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137-143MHz 137-143MHz 137-143MHz
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