GE MDS DS-GPA-1 40 Watt RF Amplifier User Manual GPA 1manual RevA 5 2 16 3
GE MDS LLC 40 Watt RF Amplifier GPA 1manual RevA 5 2 16 3
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Users Manual
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| Document ID | 2993811 |
| Application ID | 6wWNg3uDeOqMmc8zdMURyg== |
| Document Description | Users Manual |
| Short Term Confidential | No |
| Permanent Confidential | No |
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| Document Type | User Manual |
| Display Format | Adobe Acrobat PDF - pdf |
| Filesize | 74.32kB (929052 bits) |
| Date Submitted | 2016-05-17 00:00:00 |
| Date Available | 2016-05-17 00:00:00 |
| Creation Date | 2016-05-17 11:01:52 |
| Producing Software | Acrobat Distiller 11.0 (Windows) |
| Document Lastmod | 2016-05-17 11:01:52 |
| Document Title | Microsoft Word - GPA-1manual_RevA 5-2-16_3.doc |
| Document Creator | PScript5.dll Version 5.2.2 |
| Document Author: | dbare |
GPA-1 manual GE MDS GPA‐1 Manual P/N draft Rev A. GPA-1 manual Table of Contents Important Information ............................................................................................................ 3 1.1 RF Exposure ................................................................................................................... 3 1.2 FCC Approval Notice ...................................................................................................... 3 1.3 FCC Part 90 Information................................................................................................. 3 1.4 Product Description ........................................................................................................ 4 1.5 Power Control Loop ........................................................................................................ 4 2 Interfaces .............................................................................................................................. 5 2.1 J101 Control Interface .................................................................................................... 5 2.2 J102 RF Output .............................................................................................................. 5 2.3 J103 RF Input ................................................................................................................. 5 2.4 J104 External/Internal Jumper........................................................................................ 5 2.5 R112 Power Control Adjustment .................................................................................... 6 3 Installation ............................................................................................................................. 6 3.1 Mounting the Unit ........................................................................................................... 6 3.2 Connecting the Unit ........................................................................................................ 6 3.3 Alignment (Setting power output) ...................................................................................... 6 GPA-1B smaller heat-sink option ................................................................................................ 7 GPA-1 standard heat-sink option ................................................................................................ 7 Unit Specifications ....................................................................................................................... 8 4 Technical Assistance ............................................................................................................ 8 5 Change Log ........................................................................................................................... 8 GPA-1 manual Important Information 1.1 RF Exposure Professional installation required. The radio equipment described in this guide emits radio frequency energy. Although the power level is low, the concentrated energy from a directional antenna may pose a health hazard. Do not allow people to come closer than 1.8 meters, (5.9 feet) to the antenna when the transmitter is operating with a unity gain antenna. This is an RF amplifier, the maximum ERP for this FCC band is 500 watts, this equates to an RF safety distance of 5.7 meters. For Canada, the maximum ERP is 125 Watts, this equates to a distance of 3.6 meters. Please consult the FCC website below for RF safety distances, using different antenna gain configurations which affect the ERP. More information on RF exposure can be found on the Internet at: www.fcc.gov/oet/info/documents/bulletins. Installation professionnelle requise. L'équipement radio décrite dans ce guide émet de l'énergie de fréquence radio. Bien que le niveau de puissance est faible, l'énergie concentrée depuis une antenne directionnelle peut-être poser un danger pour la santé. Ne laissez pas les gens à se rapprocher de 1,8 mètres, (5,9 pieds) à l'antenne lorsque l'émetteur fonctionne avec une antenne à gain unité. Il s'agit d'un amplificateur RF, la P.A.R. maximale pour cette bande de FCC est de 500 watts, cela équivaut à une distance de sécurité RF de 5,7 mètres. Pour le Canada, la P.A.R. maximale est de 125 Watts, cela équivaut à une distance de 3,6 mètres. Veuillez consulter le site de FCC ci-dessous pour les distances de sécurité RF, à l'aide de configurations de gain antenne différentes qui affectent l'ERP. Plus d'informations sur l'exposition aux radiofréquences se trouvent à l'adresse Internet : www.fcc.gov/oet/info/documents/bulletins. 1.2 FCC Approval Notice This device is offered as a licensed Amplifier per FCC Part, 90. It is approved for use under the following conditions: Changes or modifications not expressly approved by GE MDS will void the user’s authority to operate the equipment. 1.3 FCC Part 90 Information For FCC Part 90, valid frequencies are 150‐174 MHz at up to 500 Watts ERP GPA-1 manual Caution; only use authorized antennas that meet the FCC license requirements. Use of unauthorized antennas, cables, and/or coupling devices not conforming with ERP/EIRP for outdoor/indoor will void the licensee’s license to operate. Introduction The GPA‐1 is an RF power amplifier designed for use in the 150‐174 MHz frequency range at up to 40 Watts. It is intended to serve as a 100% duty cycle amplifier for MDS SD1 operating in point‐to‐multipoint repeater or base applications. 1.4 Product Description The GPA‐1 power amplifier consists of an RF amplifier and PCB mounted to a heat sink, with a DC Power interface, power control interface, and input/output RF connections on the sidewalls of the chassis. DC power is supplied to the amplifier from a regulated and filtered DC source capable of supplying 10‐16 Vdc at a maximum current of 8 Amperes. The DC power source should be current limited or have a protective fuse or circuit breaker. 1.5 Power Control Loop The GPA‐1 amplifier operates in INT mode. In Internal mode, a feedback circuit within the amplifier controls the output power. The set point is set by potentiometer R112, located within the amplifier. Further, the PA performs TX/RX switching to provide a low loss receive path when not transmitting. The TX/RX control is performed by RF detection within the PA. GPA-1 manual Figure 1 – J104 and R112 Locations 2 Interfaces 2.1 J101 Control Interface The J101 Control Interface is intended to connect to the transceiver’s control interface and provides keying and power control signals. Table 1 – J101 Control Cable Pin Functions Pin Pin 1 Pin 2 Pin 3 Pin 4 Function 3 Vdc enable TX, low=off 0.7 Vdc (varies to set RF power) Not used Ground 2.2 J102 RF Output J102 is a 50 Ohm Female Type N connector. 2.3 J103 RF Input J103 is a 50 Ohm Male Type N, REVERSE Polarity connector. This RF amp is provided with a Reverse Polarity N connector, to meet the FCC RF signal Booster/Amplifier rules. The connector is provided so that only one RF signal can be input to the RF Amp. This amplifier is designed to be only used with the GEMDS SD1 Data Transceiver. At no time shall this amplifier be used with no more than the intended single RF input, any other combination of signal shall void the FCC type approval of this amplifier 2.4 J104 External/Internal Jumper J104 is a jumper block with 3 pins. Shorting pins 1 and 2 (EXT) is not used for the GPA‐1. Shorting pins 2 and 3 (INT) enables the amplifier’s internal power detector to control the amplifier power output. Access to this jumper block is via a hole in the top cover. GPA-1 manual 2.5 R112 Power Control Adjustment R112 is used to adjust the RF power output of the amplifier in internal and mode. Turn the potentiometer clockwise for higher power and counterclockwise for lower power. 3 Installation 3.1 Mounting the Unit The GPA‐1 is designed for mounting in a standard 19–inch rack cabinet using the 3U panel provided. Four screws (not provided) are required to attach the panel to the rack sides. This panel also serves as a heat sink for the PA module, and is normally mounted with the cooling fins facing outward. 3.2 Connecting the Unit Place the amplifier module in service by making the following cable connections. 1. 2. 3. 4. Using low loss 50‐ohm coaxial cable, connect the RF Input connector (J103) to the RF output connector of the MDS SD1 radio. Using low loss 50‐ohm coaxial cable, connect the RF Output connector (J102) to the station duplexer or antenna. For use with SD1 transceiver follow these sub‐steps, PWR set between 23‐27 dBm (input power). Do not use above 27dBm for GPA‐1 input. Move Jumper J104 to the Internal Keying position as shown in Figure 1 Access to J104 is available through a top cover vent slot. Connect 10‐16 Vdc power supply to the Power connector (J100). The left pin is positive (+); the right is negative(–). 3.3 Alignment (Setting power output) Adjusting RF Power Output To check/set the amplifier’s RF power output, proceed as follows. 1. 2. 3. 4. 5. Connect a wattmeter (rated for use at 150 MHz, and at least 40 watts) to the amplifier’s RF output connector (J102). Terminate the wattmeter into a 50‐ohm, non‐inductive load. Set SD1 PWR=23dBm Apply RF drive from 150 MHz radio and note the RF power indication at J102. If necessary, adjust R112 (see Figure 2) with an insulated flat blade tool to achieve the desired output level. Access to this control is available through a top cover vent slot. GPA-1 manual GPA‐1B smaller heat‐sink option GPA‐1 standard heat‐sink option GPA-1 manual Unit Specifications Table 2 – Unit Specifications Parameter Operating Voltage Maximum Current Draw RF Drive Power RF Out Duty Cycle (GPA‐1 model) Duty Cycle (GPA‐1B model) Operating Frequency Mounting Approximate Weight Dimensions (GPA‐1 model) Dimensions (GPA‐1B‐model) FCC Identifier Name of Grantee Specification 10‐16 Vdc 8 Amperes @ 12.5V, 40W RF Out. SD1 PWR=23dBm +40 to +46 dBm (10‐40 watts), adjustable 100% up to full output power 100% at 2 Watts, 30% above 2 Watts 150–174 MHz* standard 19‐inch rack cabinet 5.15 lbs. 5.25” H x 19” W x 2.88” D (13.34 H x 48.26 W x 7.31 D cm) 5.25” H x 7” W x 2.88” D (13.34 H x 17.78 W x 7.31 D cm) E5MDS‐GPA‐1 GE MDS LLC 4 Technical Assistance For assistance, contact us using one of the following methods: Telephone: 585.241.5510 FAX: 585.242.8369 E‐mail: gemds.techsupport@ge.com Web: www.gemds.com 5 Change Log Version Date Author D.McCarthy Changes Initial release
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