Axell Wireless 60 2323SERIES User Manual
Document Number
60-232301HBK
Issue No.
2 Date
22/12/2009
Page
1 of 35
Axell Wireless UK
Axell Wireless Sweden
Dual Band Fibre Fed BDA
User Handbook
For
General Dynamics Information Technology Inc.
AWL Works Order Q119830
AWL Product Part No. 60-232301
Aerial House
Asheridge Road
Chesham, Buckinghamshire
HP5 2QD, United Kingdom
Tel: + 44 (0) 1494 777000
Fax: + 44 (0) 1494 777002
info@axellwireless.com
www.axellwireless.com
Box 7139
174 07 Sundbyberg
Sweden
Tel: + 46 (0) 8 475 4700
Fax: + 46 (0) 8 475 4799
Axell Wireless Limited
Technical Literature
Dual Band Fiber Fed BDA 60-232301
Document Number
60-232301HBK
Issue No.
2 Date
22/12/2009
Page
2 of 35
Table of Contents
1. Introduction ................................................................................................................................ 3
1.1. Scope and Purpose of Document ........................................................................................ 3
1.2. Limitation of Liability Notice.................................................................................................. 3
2. Safety Considerations................................................................................................................ 4
2.1. Earthing of Equipment ......................................................................................................... 4
2.2. Electric Shock Hazard .......................................................................................................... 4
2.3. RF Radiation Hazard ........................................................................................................... 4
2.4. Lifting and other Health and Safety Recommendations ........................................................ 4
2.5. Chemical Hazard ................................................................................................................. 5
2.6. Laser Safety ........................................................................................................................ 5
2.7. Emergency Contact Numbers .............................................................................................. 5
3. Dual Band Fibre Fed BDA 60-232301 ....................................................................................... 6
3.1. 60-232301 Specification .................................................................................................... 11
3.2. 60-232301 List of Major Sub-Components ......................................................................... 12
3.3. 60-232301 System Diagram .............................................................................................. 13
3.4. 60-232301 Front View ........................................................................................................ 14
3.5. 60-232301 Side Views ....................................................................................................... 15
3.6. 60-232301 Interior Views ................................................................................................... 16
3.6.1. Interior View Showing Optical Connectors ..................................................................... 16
3.6.2. Interior View Showing UHF Downlink Path ..................................................................... 17
3.6.3. Interior View Showing 800MHz Downlink Path ............................................................... 18
3.6.4. Interior View Showing UHF Uplink Path ......................................................................... 19
3.6.5. Interior View Showing 800MHz Uplink Path ................................................................... 20
3.6.6. Interior View Showing DC and Alarm Modules ............................................................... 21
4. Installation – General Notes..................................................................................................... 23
4.1. General Remarks ............................................................................................................... 23
4.2. Electrical Connections ....................................................................................................... 23
4.3. RF Connections ................................................................................................................. 23
4.4. Optical Connections ........................................................................................................... 23
4.5. Commissioning .................................................................................................................. 24
5. Maintenance – General Notes ................................................................................................. 25
5.1. Fault Finding ...................................................................................................................... 25
5.1.1. Quick Fault Checklist ..................................................................................................... 25
5.1.2 Fault Isolation ................................................................................................................ 25
5.1.3 Downlink ........................................................................................................................ 26
5.1.4 Uplink ............................................................................................................................. 26
5.1.5 Checking service ............................................................................................................ 26
5.1.6 Fault repair ..................................................................................................................... 26
5.1.7 Service Support ............................................................................................................. 26
5.2
Tools & Test Equipment ..................................................................................................... 27
5.3. Care of Modules ................................................................................................................ 27
5.3.1. General Comments ........................................................................................................ 27
5.3.2. LNA Replacement (general procedure) .......................................................................... 27
5.3.3. Module Replacement (general procedure) ..................................................................... 27
5.3.4. Power Amplifiers Replacement (general procedure) ...................................................... 28
5.3.5. Low Power Amplifier Replacement (general procedure) ................................................. 28
5.3.6. Module Transportation ................................................................................................... 29
Appendix A ........................................................................................................................................ 30
A.1. Glossary of Terms used in this document .......................................................................... 30
A.2. Key to Drawing Symbols used in this document ................................................................. 31
A.3. EC Declaration of Conformity ............................................................................................. 32
A.4. Waste Electrical and Electronic Equipment (WEEE) Notice ............................................... 33
A.5. Document Amendment Record .......................................................................................... 34
Appendix B ........................................................................................................................................ 35
B.1 Initial Equipment Set-Up Calculations ................................................................................ 35
Axell Wireless Limited
Technical Literature
Dual Band Fiber Fed BDA 60-232301
Document Number
60-232301HBK
Issue No.
2 Date
22/12/2009
Page
3 of 35
1. Introduction
1.1. Scope and Purpose of Document
This handbook is for use solely with the equipment identified by the Axell Wireless Limited (AWL) Part
Number shown on the front page. It is not to be used with any other equipment unless specifically
authorised by AWL. This is a controlled release document and, as such, becomes a part of the Axell
Wireless Total Quality Management System. Alterations and modification may therefore only be
performed by Axell Wireless.
AWL recommends that the installer of this equipment familiarise themselves 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 AWL, normally at the company’s repair facility in Chesham, England.
This handbook has been prepared in accordance with BS 4884, and AWL’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 Operations Support Director (see section 2.7.).
This document fulfils the relevant requirements of Article 6 of the R&TTE Directive.
1.2. Limitation of Liability Notice
This manual is written for the use of technically competent operators/service persons. No liability is
accepted by AWL 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, AWL does not warrant the absolute accuracy of the information contained within this
manual, or its completeness, fitness for purpose, or scope.
AWL 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.
Unless specified otherwise, all AWL 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.
Axell Wireless Limited
Technical Literature
Dual Band Fiber Fed BDA 60-232301
Document Number
60-232301HBK
Issue No.
2 Date
22/12/2009
Page
4 of 35
2. Safety Considerations
2.1. Earthing of Equipment
Equipment 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
The risk of electrical shocks due to faulty mains driven power supplies whilst
potentially ever present in any electrical equipment, would be minimised by adherence
to good installation practice and thorough testing at the following stages:
a) Original assembly.
b) Commissioning.
c) Regular intervals, thereafter.
All test equipment must 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.
2.3. RF Radiation Hazard
RF radiation, (especially at UHF frequencies) arising from transmitter outputs
connected to AWL’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 un-terminated. 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
compromise 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.
2.4. Lifting and other Health and Safety Recommendations
Certain items of AWL equipment are heavy and care should be taken when lifting
them by hand. Ensure that a suitable number of personnel, appropriate lifting
apparatus and appropriate personal protective equipment is used especially when
installing Equipment above ground e.g. on a mast or pole and manual handling
precautions relevant to items of the weight of the equipment being worked on must be
observed at all times when handling, installing or dismounting this equipment.
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Document Number
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2.5. Chemical Hazard
Beryllium Oxide, also known as Beryllium Monoxide, or Thermalox™, is sometimes
used in devices within equipment produced by Axell Wireless 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 Axell Wireless Ltd. for
disposal.
To return such equipment, please contact the Operations Support 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 AWL 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.
2.6. Laser Safety
General good working practices adapted from
EN60825-2: 2004/ EC 60825-2:2004
Do not stare with unprotected eyes or with any unapproved optical device at the fibre
ends or connector faces or point them at other people, Use only approved filtered or
attenuating viewing aids.
Any single or multiple fibre end or ends found not to be terminated (for example, matched, spliced)
shall be individually or collectively covered when not being worked on. They shall not be readily
visible and sharp ends shall not be exposed.
When using test cords, the optical power source shall be the last connected and the first
disconnected; use only approved methods for cleaning and preparing optical fibers and optical
connectors.
Always keep optical connectors covered to avoid physical damage and do not allow any dirt/foreign
material ingress on the optical connector bulkheads.
The optical fibre jumper cable minimum bend radius is 3cm; bending to a smaller radius may result in
optical cable breakage and excessive transmission losses.
Caution: The FO units are NOT weather proof.
2.7. Emergency Contact Numbers
The AWL Operations Support Department can be contacted on:
Telephone +44 (0)1494 777000
Fax. +44 (0)1494 777002
e-mail qa@axellwireless.com
Axell Wireless Limited
Technical Literature
Dual Band Fiber Fed BDA 60-232301
Document Number
60-232301HBK
Issue No.
2 Date
22/12/2009
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3. Dual Band Fibre Fed BDA 60-232301
Dual Band Fibre Fed BDA 60-232301 is built into a wall-mounted, environmentally protected (IP65)
aluminium alloy case; RF ports and connectors are also IP65 standard making the entire enclosure
and connecting ports weatherproof. 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 Power On and Alarm
indicators on the outside of the door.
The BDA is used to filter and amplify the signal levels of two (UHF and 800MHz) Downlink and Uplink
frequency bands; one RF port connects to a Distributed Antenna System facing the mobile units and
four Optical Ports (primary and secondary D/L and primary and secondary U/L) receive Optical
signals from (Downlink) and transmit optical signals to (Uplink) the Master Site.
Primary F/O D/L feed from
Master Site
Secondary F/O D/L feed from
Master Site
Primary F/O U/L feed to
Master Site
Secondary F/O U/L feed to
Master Site
Simplified System Sketch
Downlink
Downlink signals are received from the Master Site as Optical signals via Fibre Optic cables which
enter the case of the BDA at the cable gland annotated “A” in section 3.5. There are two Downlink
optical cables, a primary link and a secondary (redundant) link. The primary Downlink optical cable
connects to the BDA at the SC/APC optical port annotated “B” in section 3.6.1.; the optical signal is
demodulated to RF by the F/O Transceiver Module J1361001 annotated “A” in section 3.6.1. and the
resultant RF Downlink signal passes into RF Relay Assembly 20-001507.
The secondary Downlink optical cable connects to the BDA at the SC/APC optical port annotated “C”
in section 3.6.1.; the optical signal is demodulated to RF by the F/O Transceiver Module J1361001
annotated “D” in section 3.6.1. and the resultant RF Downlink signal also passes into RF Relay
Assembly 20-001507 which is normally set to pass the primary signal but if the primary signal strength
falls below a pre-set level then the RF relay switches to the secondary Downlink path. After leaving
the RF relay the Downlink signal passes through an AGC Detector Module 17-019802 which monitors
the strength of the RF signals entering the RF relay and if the primary signal falls below its pre-set
threshold then the AGC Detector switches the RF relay to pass the secondary Downlink signal path.
The Downlink signal then passes through a Crossband Coupler 07-004814 (annotated “G” in sections
3.6.2. & 3.6.3.) which splits the UHF band signal from the 800MHz band signal.
UHF Downlink
The UHF branch then passes through a bandpass filter 02-010501(annotated “H” in section 3.6.2.)
which is tuned to pass the UHF Downlink passband and to reject out-of-band noise and then passes
through Variable Switched Attenuator 10-000901 (annotated “I” in section 3.6.2.) which can provide
up to 15dB of attenuation in 1dB steps if required, the attenuation is controlled by a set of four toggle
switches on the body of the attenuator; each switch is clearly marked with the attenuation it provides,
and the total attenuation in-line is the sum of the values switched in.
DOWNLINK
60-232301
RF D/L O/P to and
U/L I/P from DAS
UPLINK
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After leaving the attenuator the UHF Downlink passes through AGC Attenuator Module 17-016401
(annotated “J” in section 3.6.2.) which is controlled by UHF Downlink AGC Detector Module 17019802 and is capable of providing up to 15dB of signal attenuation.
The UHF Downlink then passes through two stages of amplification; the first stage is composed of
two Low Noise Amplifiers 11-007402, arranged in parallel (each providing 30dB of signal gain). The
signal is split into two equal paths by a 3dB Splitter/Combiner 05-002603 (annotated “K” in section
3.6.2.) and each path passes through one of the LNAs (annotated “L” and “M” in section 3.6.2.) before
being recombined by a second 2 way splitter/combiner 05-002603 (annotated “N” in section 3.6.2.).
The second stage is composed of two 5W Power Amplifiers 12-021601 arranged in parallel (each
providing 30dB of signal gain). The signal is split into two equal paths by a 3dB Splitter/Combiner 05002603 (annotated “O” in section 3.6.2.) and each path passes through one of the PAs (annotated “P”
and “Q” in section 3.6.2.) before being recombined by a second 2 way splitter/combiner 05-002603
(annotated “R” in section 3.6.2.).
After leaving the Power Amplifiers the UHF Downlink signal path passes through an AGC Detector
Module 17-019801 (annotated “S” in section 3.6.2.) which regulates the gain level by adjusting AGC
Attenuator Module 17-016401; The AGC Detector module monitors the RF level being delivered by
the power amplifier, and when a certain threshold is reached it begins to increase the value of the
AGC Attenuator Module to limit the RF output to the (factory set) threshold. Therefore overloading of
the power amplifier is avoided.
After leaving the AGC Detector Module the UHF Downlink passes through the Downlink path of
Bandpass Duplexer Module 16-041402 (annotated “T” in section 3.6.2.) to further reject out-of-band
noise. Upon leaving the Duplexer module the UHF Downlink signal passes into a second Crossband
Coupler 07-004814 (annotated “U” in sections 3.6.2. & 3.6.3.) which combines the UHF Downlink with
the 800MHz band Downlink path and the combined signal exits the BDA for the DAS via the N type
port labelled “ANT. FACING MOBILES” (annotated “B” in section 3.5.)
800MHz Downlink
After passing through Crossband Coupler 07-004814 (annotated “G” in sections 3.6.2. & 3.6.3.) the
800MHz branch then passes through a bandpass filter 02-007201 (annotated “H” in section 3.6.3.)
which is tuned to pass the 800MHz Downlink passband and to reject out-of-band noise and then
passes through Variable Switched Attenuator 10-000901 (annotated “I” in section 3.6.3.) which can
provide up to 15dB of attenuation in 1dB steps if required, the attenuation is controlled by a set of four
toggle switches on the body of the attenuator; each switch is clearly marked with the attenuation it
provides, and the total attenuation in-line is the sum of the values switched in.
After leaving the attenuator the 800MHz Downlink passes through AGC Attenuator Module 17-016401
(annotated “J” in section 3.6.3.) which is controlled by 800MHz Downlink AGC Detector Module 17019802 and is capable of providing up to 15dB of signal attenuation.
The 800MHz Downlink then passes through two stages of amplification; the first stage is composed of
two Low Noise Amplifiers 11-006702, arranged in parallel (each providing 30dB of signal gain). The
signal is split into two equal paths by a 3dB Splitter/Combiner 05-002602 (annotated “K” in section
3.6.3.) and each path passes through one of the LNAs (annotated “L” and “M” in section 3.6.3.) before
being recombined by a second 2 way splitter/combiner 05-002602 (annotated “N” in section 3.6.3.).
The second stage is composed of two 20W Power Amplifiers 12-023301 arranged in parallel (each
providing 37dB of signal gain). The signal is split into two equal paths by a 3dB Splitter/Combiner 05002602 (annotated “O” in section 3.6.3.) and each path passes through one of the PAs (annotated “P”
and “Q” in section 3.6.3.) before being recombined by a second 2 way splitter/combiner 05-002602
(annotated “R” in section 3.6.3.).
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After leaving the Power Amplifiers the 800MHz Downlink signal path passes through an AGC
Detector Module 17-019801 (annotated “S” in section 3.6.3.) which regulates the gain level by
adjusting AGC Attenuator Module 17-016401; The AGC Detector module monitors the RF level being
delivered by the power amplifier, and when a certain threshold is reached it begins to increase the
value of the AGC Attenuator Module to limit the RF output to the (factory set) threshold. Therefore
overloading of the power amplifier is avoided.
After leaving the AGC Detector Module the 800MHz Downlink passes through a second bandpass
filter 02-007201 (annotated “T” in section 3.6.3.) which is tuned to pass the 800MHz Downlink
passband and to further reject out-of-band noise. Upon leaving the Bandpass Filter 800MHz Downlink
signal passes into a second Crossband Coupler 07-004814 (annotated “U” in sections 3.6.2. & 3.6.3.)
which combines the 800MHz Downlink with the UHF band Downlink path and the combined signal
exits the BDA for the DAS via the N type port labelled “ANT. FACING MOBILES” (annotated “B” in
section 3.5.)
Uplink
Uplink signals are received from the DAS and enter the case of the BDA at the N type port labelled
“ANT. FACING MOBILES” (annotated “B” in section 3.5.).
The Uplink signal then passes through a Crossband Coupler 07-004814 (annotated “B” in sections
3.6.4. & 3.6.5.) which splits the UHF band signal from the 800MHz band signal.
UHF Uplink
The UHF branch then passes through the Uplink path of Bandpass Duplexer Module 16-041402
(annotated “C” in section 3.6.4.) which is tuned to pass the UHF Uplink passband and to reject out-ofband noise and then passes through the first of two amplification stages.
The first stage is composed of two Low Noise Amplifiers 11-007402, arranged in parallel (each
providing 30dB of signal gain). The signal is split into two equal paths by a 3dB Splitter/Combiner 05002603 (annotated “D” in section 3.6.4.) and each path passes through one of the LNAs (annotated
“E” and “F” in section 3.6.4.) before being recombined by a second 2 way splitter/combiner 05-002603
(annotated “G” in section 3.6.4.).
The UHF Uplink then passes through Variable Switched Attenuator 10-000701 (annotated “H” in
section 3.6.4.) which can provide up to 30dB of attenuation in 1dB steps if required, the attenuation is
controlled by a set of four toggle switches on the body of the attenuator; each switch is clearly marked
with the attenuation it provides, and the total attenuation in-line is the sum of the values switched in.
After leaving the attenuator the UHF Uplink passes through AGC Attenuator Module 17-016401
(annotated “I” in section 3.6.4.) which is controlled by UHF Uplink AGC Detector Module 17-019802
and is capable of providing up to 15dB of signal attenuation.
The UHF Uplink then passes through a Bandpass Filter 02-010501 to further reject out-of-band noise
and then through the second stage of amplification, the second stage is composed of two 1W Low
Power Amplifiers 12-030301 arranged in parallel (each providing 33dB of signal gain). The signal is
split into two equal paths by a 3dB Splitter/Combiner 05-002603 (annotated “K” in section 3.6.4.) and
each path passes through one of the PAs (annotated “L” and “M” in section 3.6.4.) before being
recombined by a second 2 way splitter/combiner 05-002603 (annotated “N” in section 3.6.4.).
After leaving the Low Power Amplifiers the UHF Uplink signal path passes through an AGC Detector
Module 17-019802 (annotated “O” in section 3.6.4.) which regulates the gain level by adjusting AGC
Attenuator Module 17-016401; The AGC Detector module monitors the RF level being delivered by
the power amplifier, and when a certain threshold is reached it begins to increase the value of the
AGC Attenuator Module to limit the RF output to the (factory set) threshold. Therefore overloading of
the power amplifier is avoided.
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After leaving the AGC Detector Module the UHF Uplink passes through a second Crossband Coupler
07-004814 (annotated “P” in sections 3.6.4. & 3.6.5.) which combines the UHF Uplink with the
800MHz band Uplink path; the combined signal then passes through a 3dB Splitter/Combiner 05002901 (annotated “Q” in sections 3.6.4. & 3.6.5.) which splits the combined Uplink signal into two
equal paths.
One path is fed to the F/O Transceiver Module J1361001 (annotated “R” in sections 3.6.4. & 3.6.5.)
for the primary optical link. The F/O Transceiver Module modulates the RF signal onto a laser and the
primary optical uplink exits the BDA for the master site via the SC/APC optical port annotated “T” in
sections 3.6.4. & 3.6.5.
The second branch of the Uplink path is fed to the F/O Transceiver Module J1361001 (annotated “S”
in sections 3.6.4. & 3.6.5.) for the secondary optical link. The F/O Transceiver Module modulates the
RF signal onto a laser and the secondary optical uplink exits the BDA for the master site via the
SC/APC optical port annotated “U” in sections 3.6.4. & 3.6.5.
800MHz Uplink
After passing through Crossband Coupler 07-004814 (annotated “B” in sections 3.6.4. & 3.6.5.) the
800MHz branch then passes through Bandpass filter 02-007201 (annotated “C” in section 3.6.5.)
which is tuned to pass the 800MHz band Uplink passband and to reject out-of-band noise and then
passes through the first of two amplification stages.
The first stage is composed of two Low Noise Amplifiers 11-006702, arranged in parallel (each
providing 30dB of signal gain). The signal is split into two equal paths by a 3dB Splitter/Combiner 05002602 (annotated “D” in section 3.6.5.) and each path passes through one of the LNAs (annotated
“E” and “F” in section 3.6.5.) before being recombined by a second 2 way splitter/combiner 05-002602
(annotated “G” in section 3.6.5.).
The 800MHz Uplink then passes through Variable Switched Attenuator 10-000701 (annotated “H” in
section 3.6.5.) which can provide up to 30dB of attenuation in 1dB steps if required, the attenuation is
controlled by a set of four toggle switches on the body of the attenuator; each switch is clearly marked
with the attenuation it provides, and the total attenuation in-line is the sum of the values switched in.
After leaving the attenuator the 800MHz Uplink passes through AGC Attenuator Module 17-016401
(annotated “I” in section 3.6.5.) which is controlled by UHF Uplink AGC Detector Module 17-019802
and is capable of providing up to 15dB of signal attenuation.
The 800MHz Uplink then passes through a second Bandpass Filter 02-007201 to further reject out-ofband noise and then through the second stage of amplification, the second stage is composed of two
1W Low Power Amplifiers 12-030302 arranged in parallel (each providing 30dB of signal gain). The
signal is split into two equal paths by a 3dB Splitter/Combiner 05-002602 (annotated “K” in section
3.6.5.) and each path passes through one of the PAs (annotated “L” and “M” in section 3.6.5.) before
being recombined by a second 2 way splitter/combiner 05-002602 (annotated “N” in section 3.6.5.).
After leaving the Low Power Amplifiers the 800MHz Uplink signal path passes through an AGC
Detector Module 17-019802 (annotated “O” in section 3.6.5.) which regulates the gain level by
adjusting AGC Attenuator Module 17-016401; The AGC Detector module monitors the RF level being
delivered by the power amplifier, and when a certain threshold is reached it begins to increase the
value of the AGC Attenuator Module to limit the RF output to the (factory set) threshold. Therefore
overloading of the power amplifier is avoided.
After leaving the AGC Detector Module the 800MHz Uplink passes through a second Crossband
Coupler 07-004814 (annotated “P” in sections 3.6.4. & 3.6.5.) which combines the 800MHz Uplink
with the UHF band Uplink path; the combined signal then passes through a 3dB Splitter/Combiner 05002901 (annotated “Q” in sections 3.6.4. & 3.6.5.) which splits the combined Uplink signal into two
equal paths.
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One path is fed to the F/O Transceiver Module J1361001 (annotated “R” in sections 3.6.4. & 3.6.5.)
for the primary optical link. The F/O Transceiver Module modulates the RF signal onto a laser and the
primary optical uplink exits the BDA for the master site via the SC/APC optical port annotated “T” in
sections 3.6.4. & 3.6.5.
The second branch of the Uplink path is fed to the F/O Transceiver Module J1361001 (annotated “S”
in sections 3.6.4. & 3.6.5.) for the secondary optical link. The F/O Transceiver Module modulates the
RF signal onto a laser and the secondary optical uplink exits the BDA for the master site via the
SC/APC optical port annotated “U” in sections 3.6.4. & 3.6.5.
Dual Band Fibre Fed BDA 60-232301 is powered by an AC input of 115V which drives a pair of
identical 600Watt PSU modules connected via power combining diodes in a dual redundant
configuration to provide a 24V DC supply which in turn is used to feed a pair of DC/DC convertors the
12V outputs of which are similarly combined via diodes. The 12V DC supply is then further modified
by a multi-voltage converter to provide a range of DC voltages to power the active modules within the
BDA
A comprehensive alarm system is fitted; all the amplifier, fibre optic and PSU modules carry their own
voltage-free contact alarm relay outputs which are fed to and collated by a control PCB, the Generic
Interface Board Assembly 17-020001 (annotated “L” in section 3.6.6.); from here alarm data is fed to
the F/O Transceiver Modules and modulated onto the Uplink optical signal to be demodulated at the
BTS. A summary alarm output is also present at the terminal block (terminals 7 & 8) (annotated “L” in
section 3.6.1.) on the front face of the External Alarm and Battery Module J1161030 (annotated “K” in
section 3.6.1.) The summary output is then fed to the 6 pole panel plug labelled “ALARM” (annotated
“D” in section 3.5.) on the side of the case.
Two ports are provided where an operator may connect into the system using a laptop PC running
suitable terminal-emulation software to interrogate the control PCB to gain access to alarm
information and to configure the equipment. A local serial port, (a 9 way “D” panel socket annotated
“J” in section 3.6.1.) and an RJ45 Ethernet port (annotated “I” in section 3.6.1.)
Control data from the BTS for the AGC system are modulated onto the optical Downlink signal and
demodulated by the F/O Transceiver Modules to be fed to the control PCB.
Axell Wireless Limited
Technical Literature
Dual Band Fiber Fed BDA 60-232301
Document Number
60-232301HBK
Issue No.
2 Date
22/12/2009
Page
11 of 35
UHF
380-385 MHz
UHF
+50d
Bm
Passband Gain
>50 dB
In Band Spurious Noise
(30kHz B
/W) < -13dBm @ (Max gain)
AC Supply Voltage
110V to 240V
3.1. 60-232301 Specification
PARAMETER SPECIFICATION
Optical Downlink
Optical Input Alarm Threshold < -9dBm at 1310nm
RF Downlink
Passband
Frequency
1dB Compression
800MHz 851-869 MHz
Passband Gain 50dB
Passband Ripple <±1.5 dB
Switch Attenuator 0dB to 15dB (± 1dB) in 1dB steps
UHF +38dBm
800MHz +45dBm
OIP3
In Band Spurious Noise (30kHz B/W) < -13dBm @ (Max gain)
RF Uplink
Passband
Frequency
Passband Ripple <±1.5 dB
Switch Attenuator 0dB to 30dB (± 1dB) in 2dB steps
1dB Compression +30dB
Optical Uplink
F/O TX Output Power > 0dBm at 1550nm
General
RF Connectors N type female
Optical Connectors SC/APC
Temperature
Range
800MHz +63dBm
ALC setting 2dB below compression
UHF 390-395 MHz
800MHz 806-824 MHz
ALC Setting 0dBm (FCC -13dBm 3 Carriers)
OIP3 +40dBm
Noise Figure <5dB (max. gain)
Case Size 909mm x 780mm x 275mm
Case Material Aluminium Alloy (2mm)
Case Finish Light Grey RAL7035 Semi-gloss
UHF Downlink
UHF Uplink
Alarms Fitted
operation -20°C to +60°C
storage -40°C to +70°C
Humidity 95% RHNC
800MHz Downlink
800MHz Uplink
F/O RX
F/O TX
Axell Wireless Limited
Technical Literature
Dual Band Fiber Fed BDA 60-232301
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