FCC ID: MI7-ECSHPA80TX App endix A A1
FCC ID: MI7-ECSHPA80TX ELECTROCOM INVADRtm MOBILE DATA AND VOICE SYSTEM COMPONENT HPA8 800 MHZ HIGH POWER AMPLIFIER PRODUCT SUPPORT MANUAL Document Number 516-80075 Revision X2 11909 East Telegraph Road, Santa Fe Springs, CA 90670-3785 Voice: (562) 946-9493 Fax: (562) 949-0223 A2
FCC ID: MI7-ECSHPA80TX NOTICES INVADRtm is a registered trademark of ElectroCom Systems, Inc. Contents copyrighted 2001 by ElectroCom Systems, Inc. All rights reserved.
FCC ID: MI7-ECSHPA80TX CONTENTS 1. Introduction .................................................................................... 1.1 Scope ...................................................................................... 1.2 Reference Materials ................................................................ 1.2.1 ElectroCom Documents ............................................... 1.3 Product Description ................................................................ 1.4 Product Features .......
FCC ID: MI7-ECSHPA80TX 1. Introduction 1.1 Scope This document describes the hardware of the HPA8 High Power Amplifier as follows: Section 1: Overview of the unit and its features. Section 2: Interfaces (e.g. connectors, power sources, etc.). Section 3: Installation procedure. Section 4: Circuit theory. Section 5: Maintenance procedures. Section 6: Specifications. Section 7: Warranty and warranty/non-warranty service information. Section 8: Diagrams and lists.
FCC ID: MI7-ECSHPA80TX 1.2 Reference Materials 1.2.1 ElectroCom Documents (attached) The following ElectroCom documents are provided as attachments to Section 8: NUMBER 1 2 3 4 DOCUMENT NO.
FCC ID: MI7-ECSHPA80TX 1.3 Product Description The ElectroCom HPA8 High Power Amplifier was designed specifically to operate with the ElectroCom IP8B Base Station Data Transceiver. Basically, the unit amplifies the RF output of the IP8B, providing up to 80 watts of RF power for the antenna system. The HPA8 is intended for base station use only. For enhanced reliability, the HPA8 incorporates a four power amplifier module design which permits “graceful” degradation of output power under fault conditions.
FCC ID: MI7-ECSHPA80TX 2. Interface Description As shown in section 8.3, the HPA8 has the following interface connections: J1 RF input. Typically connects to the IP8B Base Station Data Transceiver. J2 RF output. Typically connects to the antenna system components in the rack. WARNING! Do not remove the harmonic filter, or operate the HPA8 without the filter installed. Excessive harmonic emissions may result. J3 DC power connector. Plugs into a 13.8 volt (nominal), 25 amp (or greater) DC power supply.
FCC ID: MI7-ECSHPA80TX • • In enclosed racks, do not “box in” the HPA8 with large equipment mounted above and below it. This restricts airflow to a small area, and may cause overheating of both the HPA8 and the adjacent equipment. Use the appropriate size power cables and power supply. 3.2.1 Typical Rack Installation In most installations, the HPA8 is mounted vertically on an unpainted 10 ½” high rack panel, and installed in the rack.
FCC ID: MI7-ECSHPA80TX 3.2.2 Installation Instructions Install the HPA8 High Power Amplifier as follows: 1. Unpack the unit. 2. Mount the HPA8 on the rack panel (supplied). To do this, center the unit over the six mounting holes in the panel and attach with the supplied hardware. 3. Install the HPA8 panel assembly in the rack. Position it so the fan is facing down, and so that the HPA8 unit goes inside the rack. Secure the assembly to the rack with the appropriate screws and cup washers. 4.
FCC ID: MI7-ECSHPA80TX 4. Theory of Operation 4.1 Thermal Equilibration System “Equilibration” refers to the act of equalizing the operating temperatures of the four power amplifier modules. By doing so, and by keeping the temperature within reasonable limits, heat stress on the modules is reduced. This results in longer operating life for the modules, and increased overall reliability for the HPA8.
FCC ID: MI7-ECSHPA80TX Sheet 3 of 6. Transmit keying, over-temperature, and over-voltage protection circuitry. The transmit keying circuitry is shown at the top of the page. To transmit, the IP8B Base Station Data Transceiver grounds the KEY input. This input is gated with the normally high over-temperature and over-voltage inputs to produce a logic low (0V) on the output of gate U2D. This turns off transistor Q7, applying base current to transistors Q8, Q6, and Q10.
FCC ID: MI7-ECSHPA80TX Sheet 4 of 6. RF input, driver, and power divider circuitry. The purpose of this circuitry is to attenuate the incoming RF energy, amplify it to a useful level, and to divide it into four equal parts for the power amplifier modules. This design approach allows the HPA8 to accept a wider range of RF power levels than otherwise possible. The RF input circuitry is built around coupler DC1 and adjustable attenuator AT1.
FCC ID: MI7-ECSHPA80TX Sheet 6 of 6. Power combiner section. Three hybrid couplers are shown here. The purpose of these devices is to combine the RF outputs from the power amplifier modules in phase. Capacitor C23 and transmission line TRL1 form a tuned stub which reduces harmonic emissions. An isolator protects the power amplifiers from damage if a high VSWR load is connected. An external harmonic filter (not shown) attached to the RF OUT connector provides an additional measure of harmonic suppression.
FCC ID: MI7-ECSHPA80TX 7. Warranty and Service 7.1 Warranty The HPA8 High Power Amplifier is covered by a one year parts and workmanship warranty. The warranty goes into effect upon shipment. The warranty does not cover Acts of God such as damage from a lightning strike, fire, or a flood. The warranty does not cover damage arising from user tampering or user misadjustment. The customer is responsible for isolating the fault to the HPA8, and for removing and reinstalling the unit for service.
FCC ID: MI7-ECSHPA80TX 8. Diagrams and Lists Please refer to the HPA8 Block Diagram, Schematic Diagrams, Interconnection Diagram, and Parts Lists on the following pages.
