Andrew Base Station Subsystems Group 100978MCPA 1960 CDMA Multiple Carrier Power AmplifierRF100978 User Manual Introduction

Andrew Corporation, Base Station Subsystems Group 1960 CDMA Multiple Carrier Power AmplifierRF100978 Introduction

Users Manual

Andrew Corporation Proprietary – Use pursuant to Company Instruction 1 of 8 1960 CDMA Multiple Carrier Power Amplifier Model: RF100978 Operation Instruction Date: Mar 19, 2008 Version. 1.1 Ref# FCC ID S8L-100978MCPA
Andrew Corporation Proprietary – Use pursuant to Company Instruction 2 of 8 Introduction This document presents description of the Andrew Corporation 1960 CDMA Band MCPA (Multi-Carrier Power Amplifier) amplifier. The MCPA amplifier is a high power, RF amplifier intended to provide signal amplification and conditioning. The MCPA amplifier is compatible with CDMA air interfaces operating in U.S. domestic cell sites where FCC compliance is mandatory. The 1960 CDMA band (1930 MHz to 1990 MHz) RF power amplifier is capable of amplifying multiple carriers to a composite power level of 75 Watts. MCPA Specifications The RF100978 provides linear amplification of multi-carrier signals in the CDMA frequency band. The specifications are: Parameter Specification Operating RF Band 1930MHz – 1990MHz Instantaneous BW 15MHz Input DC Power +24 VDC, nominal DC voltage input range +18VDC to +30VDC Rated Output Power @ ≥ 18 to 30 VDC input 75W composite average Rated Power per Carrier 37.5W (2 carriers) 25W (3 carriers) DC-RF Efficiency >27%, rated output power, nominal input voltage @ 25°C Input signal type CDMA (IS-95) Physical dimensions 16.1” (H) x 3.54” (W) x 15.7”(D) Weight 35lbs Cooling technique External fan tray or shelf Temperature Range -5°C to +55°C operational Table 1 MCPA Specifications
Andrew Corporation Proprietary – Use pursuant to Company Instruction 3 of 8 The amplifier has been designed to support an instantaneous bandwidth of 15 MHz. Multiple carriers may be placed within a continuous 15 MHz span in the CDMA band and the product shall meet specified performance marks. The amplifier has a nominal gain of 47.5 dB. The MCPA is designed to meet IS-95 specifications over frequency, temperature (-5°C to +55°C), and power level (up to a maximum of 75W RF output power). Functional Blocks: The 1960 CDMA MCPA is comprised of the following functional areas: - Predistortion Circuit - Main amplifier Stage - Power conversion and conditioning circuit - Controller circuit - Communications circuit Inputs and Outputs: The amplifier is powered from a DC supply voltage which can range from +18V to +30V. The DC power is brought into the amplifier through a D-Sub connector located on the front faceplate of the amplifier. A second D-Sub connector located on the amplifier front faceplate is used for RS-485 communication. This connector is used for amplifier configuration, monitoring and alarms. Alarms and operating state are communicated to the outside world through the RS-485 communications bus and a visible bi-color LED located on the amplifier front faceplate. The RF signal is brought into the amplifier through one SMA type connector located on the front faceplate of the amplifier. The amplifier RF signal is brought out of the amplifier through a N type connector located on front faceplate of the amplifier Control System: A microprocessor controller is used to control the amplifier alarm system, control environmental compensation of the amplifier, and to maintain a linearization solution for the predistortion circuit.
Andrew Corporation Proprietary – Use pursuant to Company Instruction 4 of 8 Figure 1 RF100978 MCPA Front Panel Figure 2 RF100978 MCPA Back Panel Figure 3 RF100978 MCPA Top & Bottom Panels
Andrew Corporation Proprietary – Use pursuant to Company Instruction 5 of 8 Figure 4 RF100978 MCPA Side Panels
Andrew Corporation Proprietary – Use pursuant to Company Instruction 6 of 8 The following table is a summary of detailed alarms within the MCPA. The alarms are mapped to front panel LED behavior, as indicated. Additionally, the alarms are available at the D-Sub connector at on the front faceplate of the MCPA. Condition Alarm Type Description LED Color Initial Power On, no alarms - - Red Gain Control Minor Automatic Gain Control Loop out of specification Green Linearization Minor Output Inter-modulation Products are out of specification Green High Temperature Warning Minor High Temperature Warning Green DC voltage regulation Minor DC Voltage regulation out of range Warning Green High DC power consumption Minor High DC Power Consumption Warning Green Partial Main Amp Failure Minor Partial failure within RF chain, RF output is backed off Green Temperature Overload Major Overload Temperature threshold reached. Unit will shutdown Red DC/DC converter Shutdown Major Failure within DC/DC converter. Unit will shutdown Red DC Power Consumption Overload Major Overload DC Power Consumption. Unit will shutdown Red Table 2 Alarm mapping for MCPA Note 1: During a Minor Alarm event, RF output is enabled, however, the product may be out of specification. Minor Alarms are recoverable. Note 2: During a Major Alarm event, the unit will shutdown for self-protection. Major Alarms are non-recoverable and require a Reset or cycling of the power switch Note 3: Details as to the specific alarm event are retrieved through the front panel RS-485 interface.
Andrew Corporation Proprietary – Use pursuant to Company Instruction 7 of 8 The following table shows the pin out for the D-sub connector including the alarm pins. Signal Description Pin Number Manual Control Control ON/OFF 1 GND Ground 2 PA-Enable-Actif + Control 3 PA-Enable-Actif - Control 4 PA_Presence_Reset Towards Micro Controller 5 GND_Presence_Reset Ground 6 Reserved Not allowed for the MCPA 7 GND Ground 8 Reserved Not allowed for the MCPA 9 Reserved Not allowed for the MCPA 10 GND Ground 11 Reserved Not allowed for the MCPA 12 Red LED LED 13 UART TX + (TRM to MCPA) Exchanged Information 14 UART TX - (TRM to MCPA) Exchanged Information 15 Reserved Not allowed for the MCPA 16 UART RX + (MCPA to TRM) Exchanged Information 17 UART RX - (MCPA to TRM) Exchanged Information 18 GND Ground 19-24 Green LED LED 25 Table 3: Pin out for D-Sub connector
Andrew Corporation Proprietary – Use pursuant to Company Instruction 8 of 8 Installation and Operation Set-Up The MCPA must be installed into a shelf that provides fan-cooling. The MCPA requires +24VDC with a current handling capacity of up to 12.4A. An RS-485 interface is provided and must be utilized to configure the PA for operation and monitoring of alarms and status. RF cables connect from a radio source to the SMA-type input; from the N-type output to a filter-duplexer module. FCC Statements: FCC ID S8L-100978MCPA This device complies with Part 2, 15 & 24 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference and (2) this device must accept any interference received, including interference that may cause undesired operation. Warning Changes of modifications not expressly approved by the manufacturer could void the user’s authority to operate the equipment.

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