GE MDS DS-ENETL2W MDS eNETL2W 20-Watt RF Amplifier User Manual 4218A TransNET Board

GE MDS LLC MDS eNETL2W 20-Watt RF Amplifier 4218A TransNET Board

Manual

MDS 05-4218A01, Rev. 01 eNETL2W 20-Watt Power Amplifier Page 1 of 1 INTRODUCTION The eNETL2W (Figure 1) is a 20-watt RF power amplifierdesigned for use in the 217–222 MHz frequency range. It isintended to serve as a 100% duty cycle amplifier for MDSentraNET 220 radio modules (ROR220) operating in point-to-multipoint repeater applications. The amplifier is designed tocomply with FCC Part 90 and FCC Part 15 requirements. Figure 1. MDS eNETL2W RF Power Amplifier (Top cover removed to show internal layout) Product Description The eNETL2W power amplifier consists of a RF amplifier andPCB mounted to a heat sink, with a DC Power interface, powercontrol interface, and input/output RF connections on thesidewalls of the chassis. DC power is supplied to the amplifierfrom a regulated and filtered DC source capable of supplying10-16 Vdc at a maximum current of 5 Amperes. The DC powersource should be current limited or have a protective fuse orcircuit breaker. INSTALLATION Mounting the Unit The amplifier is designed for mounting in a standard 19 -inch rack cabinet using the 3U panel provided. Four screws (not pro-vided) are required to attach the panel to the rack sides. This panel also serves as a heat sink for the PA module, and is nor-mally mounted with the cooling fins facing outward. External Connections To place the amplifier module in service, make the following ca-ble connections:1. Using low loss 50-ohm coaxial cable, connect the RF Input connector (J103) to the RF output connector of the MDS entraNET 220 radio module (ROR220).2. Using low loss 50-ohm coaxial cable, connect the RF Output connector (J102) to the station duplexer.3. Connect the Power Control interface (J101) to the MDS entraNET 220 radio module (ROR220) in accordance with the pin connections listed below. J101 is an 8-pin Molex polarized connector.Pin 1—3 Vdc enable TX, low=offPin 2—0.7 Vdc (varies to set RF power)Pin 3—Not usedPin 4—Ground4. Connect 10-16 Vdc power supply to the Power connector (J100). The left pin is positive (+); the right is negative(–). RF Power Output Check/Adjustment To check/set the amplifier’s RF power output level, proceed asfollows:1. Connect a wattmeter (rated for use at 220 MHz, and at least 20 watts) to the amplifier’s RF output connector (J102). Terminate the wattmeter into a 50-ohm, non-inductive load.2. Apply RF drive from the MDS entraNET 220 radio module (ROR220) and note the RF power indication at J102.3. If necessary, adjust R115 (see Figure 1) with an insulated flat blade tool to achieve the desired output level. Access to R115 is available through a top cover vent slot. UNIT SPECIFICATIONS Operating Voltage: 10-16 VdcMaximum Current Draw: 5 AmperesRF Drive Power: 100 mWRF Out: +40 to +43 dBm (10-20 watts), adjustableOperating Frequency: 217-220 MHzMounting: standard 19-inch rack cabinetWeight: 5.15 lbs.Dimensions: 5.25” H x 19” W x 2.88” D(13.34 H x 48.26 W x 7.31 D cm) TECHNICAL ASSISTANCE Technical assistance for MDS products is available by usingone of these methods to contact us: Telephone: 585.241.5510 FAX: 585.242.8369 E-mail: techsupport@microwavedata.com Web: www.microwavedata.comInstruction SheetMDS eNETL2W 20-Watt RF AmplifierMicrowave Data Systems Inc., 175 Science Parkway, Rochester, NY 14620 USATel. 585.242-9600 FAX 585.242-9620 www.microwavedata.com

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