Powerwave Technologies MCPS2000 User Manual

MCPS2000 Operations Manual

1 Introduction

This chapter introduces the MCPS2000 Series of Multi Carrier Power Amplifier
(MCPA) Systems. It describes structure of this manual and introduces the different
MCPS2000 Series amplifiers.

1.1 About this Manual

This Manual describes how to install, operate, and maintain the MCPS2000 series of
amplifiers. It is arranged in chapters.

Chapter 1, Introduction, introduces the systems in the MCPS2000 family and their
main features and describes how the system documentation is organized.

Chapter 2, Installation and Operation, describes how to install the MCPS2000
amplifier and place the amplifer in service.

Chapter 3, Troubleshooting, describes how to diagnose faults using the indicator
LEDs and status/alarm messages.

Chapter 4, Field Service Procedures, describes how to perform routine maintenance
and install new field-replaceable modules in the MCPS2000 amplifier.

The Specifications Appendix details the electrical, mechanical, and environmental
specifications met by this MCPS2000 amplifier, including the Connector Pinouts and
Interface Protocols used in the front panel diagnostic port and the optional base
station alarm and control interfaces.

1.2 Introduction to the MCPS2000 Family

The MCPS2000 is a modular, ultra-linear cellular-frequency amplifier system
providing up to 350 Watts (total) of output power. Designed for maximum flexibility
and reliability, the MCPS2000 can increase the range or capacity of both new and
existing base stations.

Modulations

The MCPS2000 can amplify any number of signal carriers using AMPS, CDPD, IS­136 TDMA, or IS-95 CDMA modulation up to the maximum rated system output
power.

Spectrian Proprietary

This document contains proprietary information of Spectrian, Inc. and may not be

used or disclosed except in accordance with applicable agreements.

Copyright © Spectrian, Inc. All rights reserved.

1

Introduction to the MCPS2000 Family

Modularity

The MCPS2000 family is designed for operation with 1 to 4 amplifier modules, each
providing 100 Watts of RF output power (up to 90 Watts effective output after
combining losses).

Installation

The MCPS2000 housing is an 8RU shelf. Mounting kits are available for installation
in 23-inch, 600mm, 24-inch, or 25-inch equipment racks.

RF Interfaces

It has a single RF input for the combined input signals, and a single RF output to t he
transmit filter.

Alarms and Control

The MCPS2000 provides status information through front-panel LED indicators and
an RS-232 status port. Status information can be viewed through a front-panel RS­232 port using either a VT-100 terminal emulation program or Spectrian’s Graphical
User Interface program.

The MCPS2000 can also be optionally equipped with additional alarm and control
interfaces, including dry-contact or TTL alarm connections and RS-485 or RS-422
interfaces to network operations and administration systems.

Reliability

The MCPS2000 is designed to enable system maintenance without removing the
amplifier from service. The amplifier and system control modules can be hot­swapped during operation without affecting calls in process. The amplifier modules
are designed so the cooling fans can be refit in the field by qualified service
technicians, greatly reducing service shipping costs and turn-around time.

1.2.1 MCPS2000 Systems Modules

A fully-equipped MCPS2000 consists of a rack-mounted shelf containing up to four
RF modules, an Alarm Management Module, and an internal divider/ combiner.

RF modules

The RF modules are ultra-linear amplifiers optimized for high power amplification
of cellular signals. After combining losses, each RF module provides up to 90 Watts
of RF output power.

Amplifier Management Module

The Amplifier Management Module contains the system control and alarm
management logic and the interface to external operations and control systems.

Divider/Combiner

The divider/combiner allows the four RF modules to function as a single system.
The divider/combiner has an active architecture, which automatically reconfigures to
minimize combining losses if a RF module should fail.

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MCPS2000 Operations Manual

Introduction

Major Equipment Specifications for the MCPS2000

Electrical Specifications Specification @ 25ºC

Frequency Range 869 - 894 MHz
Average Power¹ into 50 Ohms 100W (50 dBm) to 350W (55.4 dBm)
Intermodulation Distortion (IMD) -65 dBc with AMPS and/or TDMA IS-136, or IS-97

CDMA dual mo de input sources under nominal

CDMA Adjacent Channel Power

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@ 881 MHz, 100W Output < -60 dBc, 1.98 MHz offset, 30 KHz res bandwidth
Receive Band Noise -30 dBm/30 kHz bandwidth
Carrier Spacing (AMPS/TDMA) 60 KHz min., 25 MHz max.
Power Output Stability for Single Frequency ± 0.5 dB under nominal conditions
Operating Bandwidth up to 25 MHz
Gain Factory set, 30 to 60 dB, 85 dB with optional preamp
Gain Flatness vs. Frequenc y ± 0.5 dB (over all temps)
Gain Variation over Temp @ Any Inband Fr equency ± 1 dB
Forward Power Sample Port Gain -50 dB typ.
Input/Output Port Return Loss -15 dB min.
Second/Third and Greater Harmonic Output -13 dBm/-20 dBm max.
DC Input Voltage Range 26 to 28
DC Input Current @ 27VDC (max) 100W single RF module – 42A

1

Power levels at the output of the system combiner will vary depending on the configuration.

2

Reduced power performance over 21-26V. Full spec performance (22-30V) available with optional DC/DC converter.

3

Measured at the RF module out put connector and in acco rdance with IS-97.

conditions
< -45 dBc, 750 KHz offset, 30 KHz res bandwidth

2

VDC

175W two RF modules – 87A
260W three RF modules –130A
350W four RF modules – 170A

Mechanical Specifications

Operating/Storage Temperatures 0ºC to 50ºC/-40ºC to 85ºC
Size, 4 module system, mounting ears excluded (D x W x H)

17.72 x 21.56 x 13.97 in. max
(450 x 547,62 x 354,84 mm max.)

Weight, 4 module system Installed: approx. 230 lbs (105 kg)

Shipping: approx. 270 lbs max. (125 kg)
Heaviest Module: <45 lbs max. (20 kg)

Connectors RF Input(s): SMA (F)

RF Output(s): N (F)
Maintenance Port: RS232
Alarms Port: RS422
DC Inputs: 10-32 and ¼-20 threaded lugs
DC Ground: ¼-20 threaded lugs
RF Output Sample Port: SMA (F)

Indicators AMM: DC On, Alarm LEDs

MCPA Modules: DC On, Enable, Alarm, Fan LEDs

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Introduction to the MCPS2000 Family

1.2.2 MCPS2000 Functional Description

To achieve the high level of linearity required to support multiple cellular carriers at
the minimum cost, the RF modules in the MCPS2000 use a single loop feed-forward
correction architecture with two amplification loops – the main loop, containing t he
main amplifier, and the error loop, containing the error amplifier. The combination
of the two loops results in a signal in which the distortion products have been
cancelled, enabling highly linear operation of the amplifier.

Preamplifier

RF Input

Delay

Line

1.2.2.1 Main Loop

The output of the main amplifier contains both the desired signal and Inter­modulation Distortion (IMD) products. This signal is coupled off and combined with
the desired signal coupled off the preamplifier. The relative delay and phases of
these signals are adjusted so they combine to cancel out the desired signal, creating
an error signal composed of only the main amplifier IMD products.

1.2.2.2 Error Loop

Main

Vector Mod

Cancellation

Controller

Driver

Amp

Main
Amp

Pilot

Generator /

Reciever

Σ

Carrier

Cancellation

RF Module Functional Block Diagram

Error

Vector Mod

Error
Amp

Output Module

Delay Filter

τ

RF Output

The error signal is amplified in the error loop and then combined with the output of
the main amplifier containing both the desired signal and distortion products such
that the distortion products cancel. The error loop provides the adjustments
necessary so that the amplitude, phase and delay of both signals result in the desired
cancellation.

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MCPS2000 Operations Manual

Installation and Operation

2 Installation and Operation

2.1 Introduction

This chapter describes how to install, set up, and operate an MCPS2000 series
amplifier in a base station. The described installation verification checks should be
performed following installation of the MCPS2000 and after major maintenance or
repairs have been completed.

The main installation steps detailed in this procedure are as follows.

• Installation Planning

• Installation Preparation

• Rack Installation

• Cable and Wire Installation

• Verify Installation

• Power-Up the MCPS2000

• Determine Required RF Input Power

• Set RF Input Power for each Channel

2.1.1 Safety Information

Please read and understand the instructions and warnings in this section and at the
beginning of this manual before handling or unpacking the MCPS2000 modules.

The MCPS2000 is designed to be installed by trained and qualified technicians.
Each MCPS2000 amplifier module and the shelf subassembly weigh 20 kgs (44 lbs);

when crated for shipping an MCPS2000 system can weigh in excess of 100 kgs (220
lbs) and be unbalanced. To avoid injuries or damage, use care and obtain assistance
when lifting a crate containing MCPS2000 components.

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Installation Planning

2.2 Installation Planning

It is important to ensure all planning and site preparation is complete prior to
beginning to install the MCPS2000. This section describes some installation
considerations and the information required before beginning the installation
procedure.

2.2.1 Site Planning Guide

For each MCPS2000 cell site installation, there must be a Site Planning or Site
Engineering guide giving the detailed information on the site considerations, rack
installation, cable connections, and Radio Parameters.

2.2.1.1 Site Considerations

Intended Installations

The MCPS2000 is intended for installation only in restricted access areas (dedicated
equipment rooms, equipment closets, or the like) in accordance with Articles 110-16,

-17, and -18 of the National Electrical Code, ANSI/NFPA No. 70.

Weight

The MCPS2000 shelf and each RF module weigh approximately 20 kg (44 pounds);
the fully equipped system weighs 100 kg (220 pounds). The system must be
installed, using the appropriate mounting kit, into a rack capable of supporting the
unit, and located on a floor or surface capable of supporting the combined weight of
the rack, the MCPS2000, and the installer or technician.

Floor Covering

If you intend to use a floor covering under the MCPS2000, avoid combustible
materials, industrial carpeting, or materials that will permit generation of
electrostatic charges.

Illumination

The MCPS2000 is designed to be installed and serviced under normal workroom
lighting. During installation, room lighting must be bright enough to allow reading
instructions and inspection of modules, but not so bright as to interfere with viewing
the status LED indicators on the front panel. The MCPS2000 should be oriented or
shielded so that direct sunlight does not fall upon the front panel.

Fire Protection

Spectrian recommends that the MCPS2000 installation site be equipped with smoke
detectors and an automatic fire-extinguishing system. In addition, for personnel
safety, the site should be equipped with a portable halogen or CO

fire extinguisher.

2

Altitude

When installing the MCPS2000 above 5000 ft (1542 m), derate the maximum
operating temperature by 2° C per 1000 ft (304 m) above 5000 ft.

Ventilation

The MCPS2000 requires unrestricted airflow around the MCPS2000. The site must
be ventilated or air-conditioned so that ventilation air does not exceed 50° Celsius.

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MCPS2000 Operations Manual

Ambient air quality

The MCPS2000 should be installed in a location that is free of airborne dust and
toxic or corrosive fumes.

Vibration and Noise

The MCPS2000 tolerates moderate levels of vibration and ambient noise. The
MCPS2000 should not be installed in a location subject to mechanical shocks or
vibrations conducted from nearby mechanical equipment. The MCPS2000 generates
fan noise below 85 dBa during operation and no additional acoustic treatment of the
site is needed.

Lightning Protection

Spectrian recommends that when used in locations subject to lightning discharge, all
power, RF, and signal lines that connect to the MCPS2000 be protected by approved
lightning arrestors. Your local fire or safety codes will determine the type of
lightning protection required.

2.2.1.2 Rack Installation Considerations

Rack Space

The MCPS2000 requires 8RU of rack space in a 24” rack (four-slot shelves) or a 19”
rack (three-slot shelves). Optional mounting hardware for other rack sizes is also
available. When used, the optional preamplifier requires an additional 2RU above the
shelf.

Installation and Operation

Clearance

When operating, the MCPS2000 requires front cabinet clearance for unrestricted cooling
air input, plus a minimum of 8 inches behind the MCPS2000 to exhaust hot air. Some
additional rear clearance is desirable to accommodate routing the RF input and output
cables and the DC power cables to their connections on the rear of the unit.

2.2.1.3 Cable Connections

DC Power Supply

The MCPS2000 requires customer-supplied connections to the site +27 VDC power
supply. The MCPS2000 is normally connected to the power supply with a separate
connection for each RF module; a single connection to each shelf is also possible
using the optional shelf power bus. The following tables show the required current
and recommended power service for MCPS2000 systems with the indicated number
of active amplifier modules installed in a system shelf.

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Installation Planning

Individual Power Connections to each RF Module

# RF

Modules

1 100W 42 Amps 2 wires (2/module), #6AWG, #10 lugs

2 175W 87 Amps 4 wires (2/module), #6AWG, #10 lugs

3 260W 130 Amps 6 wires (2/module), #6AWG, #10 lugs

4 350W 170 Amps 8 wires (2/module), #6AWG, #10 lugs

Single Bussed Connection

When using the bussed connection option, the service should be sized for a fully
equipped shelf even if the shelf is not initially fully populated to enable future
expansion.

Recommended Service: 2 Wires, #2AWG, ¼”narrow tongue lug (T&B 55116 or
equivalent); 1 ea 200A Circuit Breaker.

Chassis Ground Wire

The MCPS2000 shelf requires a customer-supplied chassis ground connection using
#8AWG with a ¼” ring lug .

RF Output

Power

,

I

(Max)

27 VDC

1 ea 50A Circuit Breaker

2 ea 50A Circuit Breaker

3 ea 50A Circuit Breaker

4 ea 50A Circuit Breaker

Recommended Service

RF Input and Output Cables

The MCPS2000 requires a single customer-supplied SMA male RF input cable and a
single customer-supplied male type-N RF output cable. The female connectors are
on the rear of the MCPS2000 shelf.

Alarm Interface Cables

The MCPS2000 requires customer-supplied interface cables to the system alarm
interfaces. The standard system has screw terminal connections for form C relay
alarm contacts; optional RS 422 or 485 serial connections are also available. The
alarm connection options for this MCPS2000 are listed in the Appendix.

Radio Parameters

To set up the MCPS2000, the installer must know the radio parameters for the
MCPS2000 installation.

• Total Planned Output Power

• Number of CDMA Frequency Assignments and power of each

• Number of AMPS/TDMA/CDPD Channels

• Planned System Gain

Installation Equipment

Refer to the Tools and Materials listing in the following sections for the required
MCPS2000 installation and test supplies.

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MCPS2000 Operations Manual