Powerwave Technologies G20034A1 User Manual
G3 MHA INSTALLATION AND
OPERATING MANUAL
G3 MASTHEAD AMPLIFIER
INSTALLATION AND OPERATING
00/OSM/0002
ISSUE 1
May 2000
MANUAL
The information contained in this document is furnished in commercial confidence and upon the condition
that the individual and corporate rights originating in the information, whether patented or not, will be
respected.
Reference: 00/OSM/0002 Issue: 1 Date: May 2000
Prepared by:
Authorised by Engineering: Authorised by Quality:
Ranjit S Manku
REMEC-Airtech G3 Masthead Amplifier Installation and Operating Manual Page 1 of 59
G3 MHA INSTALLATION AND
OPERATING MANUAL
HISTORY
MOD/ISSUE
DATE ISSUE AUTHOR
18/05/00 1 Ranjit S Manku ECO 1262 First Issue
NOTE NOTES
00/OSM/0002
ISSUE 1
May 2000
REMEC-Airtech G3 Masthead Amplifier Installation and Operating Manual Page 2 of 59
G3 MHA INSTALLATION AND
OPERATING MANUAL
CONTENTS
1 Reference....................................................................................................................................................5
1.1 System Description.......................................................................................................................5
1.1.1 System Operation..............................................................................................................7
1.1.2 Interfaces ............................................................................................................................9
1.2 Hardware Description................................................................................................................20
1.2.1 Masthead Amplifier........................................................................................................20
1.2.2 Power Distribution Unit.................................................................................................20
1.2.3 Bias Tee...........................................................................................................................21
1.2.4 Cable Kit ...........................................................................................................................21
1.2.5 MHA Mounting Kit ............................................................................................................21
2 Installation Manual.................................................................................................................................22
2.1 General ......................................................................................................................................... 22
1.1.1 Recommended RF Cable Installation Components ..............................................23
1.1.2 Installation Summary and Mounting Configuration.................................................23
1.2 Installation of Masthead Amplifier (MHA) ...............................................................................26
1.2.1 General Mounting Instructions.....................................................................................26
1.1.2 Detailed MHA Installation Procedure..........................................................................27
1.1.3 Installation of Bias Tee..................................................................................................33
1.1.4 Installation of Power Distribution Unit........................................................................33
1.1.5 Installation of Cables.....................................................................................................34
2.3 Grounding Cables and Lightning Protection.........................................................................34
2.3.1 Clamping of cables and correct Grounding..............................................................34
2.3.2 Ground Path Requirements.........................................................................................34
2.3.3 Grounding/Earthing of the MHA...................................................................................34
2.3.4 Schematic of Lightning Protection circuit...................................................................35
2.3.5 Basic Grounding/Earthing: Good Practice.................................................................35
2.4 Installation Measurements.......................................................................................................36
2.4.1 A Method of measurement of Static Gain of the MHA..............................................36
2.4.2 Effects of Cable Length on the Noise Figure............................................................37
2.4.3 The effects of introducing REMEC-Airtech G3 MHA.................................................37
2.4.4 The Effect of Auxiliary attenuator in the Rx path ........................................................38
00/OSM/0002
ISSUE 1
May 2000
3 Operation and Maintenance................................................................................................................40
3.1.1 Set-up and Test..............................................................................................................40
3.1.2 Fault Finding and Repair Procedures........................................................................40
3.1.3 MHA to Ground Equipment DC circuit Test...............................................................42
4 Variable Gain MHA Option....................................................................................................................49
4.1 Hardware Description................................................................................................................49
4.1.1 Variable Gain Masthead Amplifier...............................................................................49
4.1.2 Power Distribution Unit.................................................................................................50
4.1.3 Bias Tee...........................................................................................................................50
4.1.4 Cable Kit ...........................................................................................................................50
4.1.5 Mounting Kit.....................................................................................................................51
4.1.6 Antenna Line Protocol Modem Kit...............................................................................51
4.2 Installation of Variable Gain MHA............................................................................................52
4.3 Operation and Maintenance of Variable Gain MHA..............................................................52
4.3.1 Gain Setting of the Variable Gain MHA.......................................................................52
5 Frequently Asked Questions ...............................................................................................................55
5.1 Lightning Protection Circuit .......................................................................................................55
5.2 Mounting and Maintenance.......................................................................................................58
6 Glossary....................................................................................................................................................59
REMEC-Airtech G3 Masthead Amplifier Installation and Operating Manual Page 3 of 59
G3 MHA INSTALLATION AND
OPERATING MANUAL
00/OSM/0002
ISSUE 1
May 2000
Table of Figures
Figure 1 MHA System Interconnection Diagram with Bias Tees ............................................... 6
Figure 2 Masthead Amplifier Circuit Schematic ...................................................................... 8
Figure 3 Masthead Amplifier Interfaces .................................................................................. 9
Figure 4 Power Distribution Unit Interfaces (Indoor)................................................................12
Figure 5 Power Distribution Unit Interfaces (Outdoor) .............................................................13
Figure 6 Bias Tee Cable Kit for Outdoor PDU........................................................................15
Figure 7 Bias Tee Interfaces ................................................................................................16
Figure 8 PDU DC Output port to Bias Tee ............................................................................17
Figure 9 PDU Alarm port to BTS Alarm................................................................................18
Figure 10 Mounting Bracket Kits...........................................................................................19
Figure 11 G3 MHA - Typical Mounting Configuration................................................................25
Figure 12 Flat Surface and Pole Mounting of a Single MHA .....................................................27
Figure 13 Flat Surface or Pole Mounting of Stacked Dual MHAs ..............................................28
Figure 14 Installation of the MHA using a Single-MHA Mounting Bracket kit. ............................31
Figure 15 Interface Drawing of G3 MHAs ................................................................................32
Figure 16 A Schematic of a Lightning Protection Circuit ..........................................................35
Figure 17 DC Circuit Test Kit ‘D’...........................................................................................43
Figure 18 Test Kit Configuration during confidence test............................................................44
Figure 19 Flow Chart 1 ~ Test Kit D confidence test................................................................45
Figure 20 Operating Current Test for a System without Bias Tee or BTS ...................................46
Figure 21 Operating Current Test for a System with a Bias Tee but without a BTS .....................47
Figure 22 Operating Current Test for a System with a Bias Tee and BTS connected ..................48
Figure 23 Antenna Line Protocol Modem................................................................................51
Figure 24 MHA Management Terminal Window on Laptop PC..................................................53
Figure 25 MHA Gain Adjustment using ALP Modem and Laptop PC.........................................54
REMEC-Airtech G3 Masthead Amplifier Installation and Operating Manual Page 4 of 59
G3 MHA INSTALLATION AND
OPERATING MANUAL
00/OSM/0002
ISSUE 1
May 2000
1 Reference
1.1 System Description
The REMEC-Airtech Masthead Amplifier (MHA) system is used within the DAMPS800,
GSM900, DCS1800 and PCS1900 band to enhance the reception sensitivity of the BTS.
The MHA improves the ‘uplink’ balance from the hand portable. This is achieved by the
installation of a Low Noise Amplifier in close proximity to the BTS antenna. The MHA
provides 12dB of gain to amplify the uplink signal from the portable subscriber handset.
The addition of the amplifier at the masthead maximises the signal available to the BTS by
overcoming the losses introduced by the BTS feeder cable. The MHA provides major
benefits in performance by matching both the 'downlink' and uplink coverage. The
historical imbalance caused by the lower handset output power is corrected by the MHA
Rx signal improvement.
The three sector MHA system comprises the following units:
Description Product Code Quantity
G3 MHA - duplexed RF / Bias Tee feed DAMPS800,
GSM900, DCS 1800 or PCS 1900 MHz frequency as
applicable
MHA Mounting Kit
Single-MHA mounting N04xxx 6 (2 per
Dual-MHA mounting
G3 PDU -48v (19” rack mount for Bias Tee)
(+ve ground / 24v / external optional)
Single Bias Tee Assembly (Indoor)
(External Bias Tee optional)
Cable Set (to suit individual installation) N05xxx 1
Antenna Line Protocol Model Kit (to use with VG MHA) N26001A1
G20xxx (DAMPS800)
G20xxx (GSM900)
N20xxx (DCS1800)
S20xxx (PCS1900)
N0403601
N02xxx 1
G03xxx (DAMPS800)
G03xxx (GSM900)
N03xxx (DCS1800)
S03xxx (PCS1900)
6 (2 per
Sector )
Sector )
3 (1 per
sector)
6
DC Circuit Test Kit ‘D’ N0402901
NOTE: If the Variable Gain Masthead Amplifier is installed without Booster PDU, an Antenna Line
Protocol Modem Kit will be required to set the gain of the MHA.
A System Interconnection diagram is shown in Figure 1.
REMEC-Airtech G3 Masthead Amplifier Installation and Operating Manual Page 5 of 59
G3 MHA INSTALLATION AND
OPERATING MANUAL
00/OSM/0002
ISSUE 1
May 2000
Figure 1 MHA System Interconnection Diagram with Bias Tees
REMEC-Airtech G3 Masthead Amplifier Installation and Operating Manual Page 6 of 59
G3 MHA INSTALLATION AND
OPERATING MANUAL
1.1.1 System Operation
The MHA system is used to enhance the uplink radio path from the remote subscriber to
the BTS. The MHA has been designed for the simple upgrade of an existing DAMPS800,
GSM900, DCS1800 or PCS 1900 cellular network or for the improved cost-effectiveness of
initial Network roll-out by the addition of a Low Noise Amplifier at the masthead with
minimum cable loss from the antenna.
The MHA accepts a single BTS and Antenna feeder cable such that the unit can be fitted
in-line with the existing cable at the masthead. The unit utilises a Bias Tee power feed
arrangement to enable the supply to be fed through the RF coaxial cable without the need
for any further cable installation for site upgrade.
The MHA is fitted with high performance low loss/high selectivity duplexers to enable the
transmit RF to pass from BTS to Antenna with < 0.5dB loss. The duplexers ensure high
Tx/Rx isolation, enabling the reception of low level signals from the mobile. The LNA is
fitted between the Rx duplexer filters to provide approximately 12dB of Rx signal gain. The
LNA comprises two low noise GaAs FET amplifiers operating in parallel for improved
reliability and higher IP3 performance. A BITE detection circuit is fitted for LNA fault
detection with an RF bypass circuit becoming operational upon a total LNA failure, i.e. in
the unlikely event that both FETs fail or loss of DC power to the LNA.
00/OSM/0002
ISSUE 1
May 2000
A block schematic of the signal flow within the MHA is shown in Figure 2
The MHA Low Noise Amplifier is supplied with +12.25V DC from the BTS RF feeder cable.
This is achieved by using Bias Tee power injection at both the MHA and the BTS feeder
cable interfaces.
The Bias Tee assembly has a low RF loss while providing DC injection/tap-off for the LNA
power feed. The unit also provides protection against the transient effects that may be
induced by lightning strikes to any part of the tower.
The overall system of 6 MHAs is supplied from a Power Distribution Unit (PDU) which
provides 6 separate +12.25V outputs via a multi-way cable assembly to the Bias Tee.
Each PDU output has a current detection window to monitor the LNA operation. Should
the MHA current fall outside the pre-set ‘normal’ operating current window, the PDU alarm
will be activated. The PDU has individual indicators for each MHA alarm with an overall
summary output alarm being provided to the BTS supervisory system. Each output and
alarm detection circuit can be separately switched for MHA muting.
The PDU operates from a -48V DC supply input from within the BTS support cabinet. The
-48V DC is converted to +12V DC for the MHA's using a dc-dc converter.
A variety of interconnecting cable kits can be provided to enable the flexible installation of
the PDU and to interconnect with the Bias Tee assemblies.
REMEC-Airtech G3 Masthead Amplifier Installation and Operating Manual Page 7 of 59
G3 MHA INSTALLATION AND
DC
OPERATING MANUAL
ANT port
Rx
00/OSM/0002
ISSUE 1
May 2000
Tx
Bias
Tee
BTS port
Figure 2 Masthead Amplifier Circuit Schematic
LNA and
bypass switch
Rx
REMEC-Airtech G3 Masthead Amplifier Installation and Operating Manual Page 8 of 59
G3 MHA INSTALLATION AND
OPERATING MANUAL
1.1.2 Interfaces
1.1.2.1 Masthead Amplifier
The MHA is provided with the following electrical interfaces (refer to Figure 3):
a) 7/16 Female (BTS): This is the connection for the duplexed Tx/Rx signals to/from the
BTS. In addition to providing for RF transmission, this connector provides for DC feed
via the RF cable and Bias Tee assembly.
b) 7/16 Female (ANT): This is the connection for the Tx/Rx Antenna. This port should be
as close as possible to the antenna with the connection being made with the
shortest/lowest loss interconnecting cable practicable.
c) M8 Earth Stud: This provides the Primary Lightning protection earth for the MHA. The
earth cable should be of the largest cross sectional area and shortest length
practicable and should be connected to a suitable earth point on the mast structure.
00/OSM/0002
ISSUE 1
May 2000
M8 EARTH STUD
7/16 FEMALE (BTS)
7/16 FEMALE (ANT)
Figure 3 Masthead Amplifier Interfaces
REMEC-Airtech G3 Masthead Amplifier Installation and Operating Manual Page 9 of 59
G3 MHA INSTALLATION AND
OPERATING MANUAL
00/OSM/0002
ISSUE 1
May 2000
1.1.2.2 Power Distribution Unit
Note: The PDU is not required where DC power to the MHAs and Alarm functions are
provided directly from the BTS.
In a standard system configuration, an indoor PDU is used. Details of the indoor PDU
interfaces are given below. A brief description of the outdoor PDU interfaces is also
included in this section.
Indoor PDU
The PDU is provided with the following electrical interfaces (refer to Figure 4):
a) DC power input connector type SLA 4/90 3.2 SN: This connector is provided for the
primary -48V DC input from the BTS supply and is wired as follows:
Pin Number Function
1 No Connection
2 Equipment Ground
3 Primary supply return
4 -48V Primary Supply Feed
b) +12V DC Output connector type 'DB9S' 9 pole Female: This connector provides the 6
individually switched DC outputs to the Bias Tee for onward coaxial supply to the MHA
and is wired as follows:
Pin Number Function
1 MHA No. 1 +12V DC Supply Output
2 MHA No. 2 +12V DC Supply Output
3 MHA No. 3 +12V DC Supply Output
4 MHA No. 4 +12V DC Supply Output
5 MHA No. 5 +12V DC Supply Output
6 MHA No. 6 +12V DC Supply Output
7 0v DC return
8 0v DC return
9 No connection
REMEC-Airtech G3 Masthead Amplifier Installation and Operating Manual Page 10 of 59
G3 MHA INSTALLATION AND
OPERATING MANUAL
c) Alarm Output connector type 'DB9P' 9 pole Male: This connector provides the Sector
and DC>DC Alarm Output and is wired as follows:
Pin Number Function
1 Sector 1 Alarm.
2 Sector 2 Alarm.
3 Sector 3 Alarm.
4 DC - DC Alarm.
5 0V Ground.
6 Sector 1 Alarm.
7 Sector 2 Alarm.
8 Sector 3 Alarm.
9 DC - DC Alarm.
00/OSM/0002
ISSUE 1
May 2000
d) M6 Earth Stud. Provides the Primary Lightning protection earth to the PDU. The earth
cable should be of the largest cross sectional area and of minimum length practicable
to provide maximum lightning protection.
REMEC-Airtech G3 Masthead Amplifier Installation and Operating Manual Page 11 of 59
G3 MHA INSTALLATION AND
OPERATING MANUAL
00/OSM/0002
ISSUE 1
May 2000
Figure 4 Power Distribution Unit Interfaces (Indoor)
REMEC-Airtech G3 Masthead Amplifier Installation and Operating Manual Page 12 of 59
G3 MHA INSTALLATION AND
OPERATING MANUAL
Outdoor PDU
The indoor compact PDU in housed inside a weatherproof enclosure to provide an
Outdoor PDU. Additional lightning protection is included within the enclosure. Details of
the outdoor PDU interfaces are shown in Figure 5
00/OSM/0002
ISSUE 1
May 2000
Figure 5 Power Distribution Unit Interfaces (Outdoor)
REMEC-Airtech G3 Masthead Amplifier Installation and Operating Manual Page 13 of 59
G3 MHA INSTALLATION AND
OPERATING MANUAL
00/OSM/0002
ISSUE 1
May 2000
Outdoor PDU is provided with the following electrical interfaces:
a) DC power input connector type SLA 4/90 3.2 SN: This connector in on the compact
PDU unit inside the outdoor enclosure and is provided for the primary -48V DC input
from the BTS supply. An input cable is passed through the grommet (DC input) on the
enclosure panel and is wired as follows:
Pin Number Function
1 No Connection
2 Equipment Ground
3 Primary supply return
4 -48V Primary Supply Feed
b) +12V DC Output connections to the Outdoor Bias Tees are provided using six cables
with ‘Binder’ connectors (one for each Bias Tee) shown in Figure 6. The cables are
passed through six ‘Bias Tee Feed’ grommets on the enclosure panel. PIN
connections on the connector block inside the enclosure are as follows:
Number on Block Function
1(+,-) MHA No. 1 +12V DC Supply Output and return
2(+,-) MHA No. 2 +12V DC Supply Output and return
3(+,-) MHA No. 3 +12V DC Supply Output and return
4(+.-) MHA No. 4 +12V DC Supply Output and return
5(+,-) MHA No. 5 +12V DC Supply Output and return
6(+,-) MHA No. 6 +12V DC Supply Output and return
c) BTS Alarm Output connector type '8 pin Metalok Bantam’ on the enclosure panel.
This connector provides the Sector and DC>DC Alarm Output and is wired as follows:
Pin Number Function
A and B Summary Sector Alarm.
C and D DC – DC Alarm
Second ‘8 pin Metalok Bantam’ connector (EXT Alarm) in normally not used.
REMEC-Airtech G3 Masthead Amplifier Installation and Operating Manual Page 14 of 59
G3 MHA INSTALLATION AND
OPERATING MANUAL
00/OSM/0002
ISSUE 1
May 2000
Figure 6 Bias Tee Cable Kit for Outdoor PDU
1.1.2.3 Bias Tee
The Bias Tee is provided with the following electrical interfaces (refer to Figure 7):
a) DIN 7/16 Female (BTS): This is the connection for the duplexed Tx/Rx signals to/from
the BTS.
b) DIN 7/16 Male (ANT): This is the RF output connection to the Antenna feeder cable.
As well as providing for RF transmission, this connector provides for DC feed via the
RF cable to the MHA.
c) PDU Input connector (type SMB Male for indoor Bias Tee, Binder for outdoor Bias
Tee): This connector provides the DC supply input to the Bias Tee for onward supply
to the MHA and it is wired as follows:
Pin Number Function
Inner Bias Tee +12V DC supply Input.
Outer Bias Tee DC return.
d) M6 Earth Stud: Provides the Primary Lightning protection earth to the Bias Tee. The
earth cable should be of the largest cross sectional area and of the minimum length
practicable to provide maximum lightning protection.
REMEC-Airtech G3 Masthead Amplifier Installation and Operating Manual Page 15 of 59
G3 MHA INSTALLATION AND
OPERATING MANUAL
00/OSM/0002
ISSUE 1
May 2000
Indoor Bias Tee
Outdoor Bias Tee
Figure 7 Bias Tee Interfaces
Note: Alternative connector genders are available to suit cable interfaces.
REMEC-Airtech G3 Masthead Amplifier Installation and Operating Manual Page 16 of 59
G3 MHA INSTALLATION AND
OPERATING MANUAL
00/OSM/0002
ISSUE 1
May 2000
1.1.2.4 Cable Kit using indoor PDU and Bias Tees
The cable kit comprises the necessary cables and interfaces to enable the interconnection
of the PDU and Bias Tee units within the BTS cabinet.
The relevant product code is N0500XXX (XXX depends on BTS type) for a BTS using
quantity 6 off Bias Tees.
a) PDU Output port to Bias Tee (refer to Figure 8)
This cable comprises six individual screened coaxial cables with a 9 pole 90
o
free 'D'
type plug for connection to the PDU DC output socket. The six individual tails are
terminated with an SMB free socket for attachment to each of the 6 Single Bias Tee
DC inputs.
Figure 8 PDU DC Output port to Bias Tee
REMEC-Airtech G3 Masthead Amplifier Installation and Operating Manual Page 17 of 59
G3 MHA INSTALLATION AND
OPERATING MANUAL
b) PDU Alarm to BTS Alarm port (refer to Figure 9)
This is an 8 conductor cable with a 9 pole 90
PDU Alarm output socket. The other end is un-terminated to enable installer
connection to the alarm concentrator PCB in the BTS cabinet.
o
free 'D' type socket for connection to the
00/OSM/0002
ISSUE 1
May 2000
Figure 9 PDU Alarm port to BTS Alarm
1.1.2.5 MHA Mounting Kit
The mounting kit comprises the brackets, fitted to both ends of the MHA, straps for pole
mounted configuration and bolts for wall mounted configuration. There are two types of
mounting bracket kits, Single-MHA mounting and Dual-MHA mounting as shown in Figure
10.
REMEC-Airtech G3 Masthead Amplifier Installation and Operating Manual Page 18 of 59
Loading...