GE MDS DS-ENETL2TU ENET-L2TU 40 watt amplifier User Manual 4218A eNETL2W PA

GE MDS LLC ENET-L2TU 40 watt amplifier 4218A eNETL2W PA

Contents

Manual

05-xxxxA01, Rev. A eNETL2T/U 40-Watt Power Amplifier Page 1 of 2
INTRODUCTION
The eNETL2T is a 40-watt RF power amplifier designed for use
in the 220–222 MHz frequency range. It is intended to serve as
a 100% duty cycle amplifier for MDS entraNET 220 radio
modules (ROR220) operating in point-to-multipoint repeater
applications. The amplifier is designed to comply with FCC Part
90 and FCC Part 15 requirements. The eNETL2U is a similar
model designed as an intermittent duty amplifier for the same
purpose.
Figure 1. MDS eNETL2 Series RF Power Amplifier
(T-model shown, cover removed to show internal layout)
Product Description
The eNETL2T/U power amplifier consists of a 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 6 Amperes. The DC power
source should be current limited or have a protective fuse or
circuit 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=off
Pin 2—0.7 Vdc (varies to set RF power)
Pin 3—Not used
Pin 4—Ground
4. 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 as
follows:
1. Connect a wattmeter (rated for use at 220 MHz, and at
least 40 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 Vdc
Maximum Current Draw: 6 Amperes
RF Drive Power: 100 mW
RF Out: +40 to +46 dBm (10-40 watts), adjustable
Operating Frequency: 220-220 MHz
Mounting: standard 19-inch rack cabinet
Approximate Weight: 5.15 lbs.
Dimensions (T-model): 5.25” H x 19” W x 2.88” D
(13.34 H x 48.26 W x 7.31 D cm)
Dimensions (U-model): 5.25” H x 7” W x 2.88” D
(13.34 H x 17.78 W x 7.31 D cm)
TECHNICAL ASSISTANCE
Technical assistance for MDS products is available by using
one of these methods to contact us:
Telephone:
585.241.5510
FAX:
585.242.8369
E-mail:
techsupport@GEmds.com
Web:
www.GEmds.com
Instruction Shee
t
MDS eNETL2T/U 40-Watt RF Amplifier
Microwave Data Systems Inc., 175 Science Parkway, Rochester, NY 14620 USA
Tel. 585.242-9600 FAX 585.242-9620 www.microwavedata.com
Page 2 of 2 eNETL2T/U 40-Watt Power Amplifier 05-xxxxA01, Rev. A
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 2.07 meters (6.79 feet) to the antenna when the transmitter is operating
in indoor or outdoor environments. More information on RF exposure can be found
on the Internet at: www.fcc.gov/oet/info/documents/bulletins.
RF Exposure
FCC Part 15 Notice
This unit complies with Part 15 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 undes-
ired operation. This device is specifically designed to be used under Section 15.247
of the FCC Rules and Regulations. Any unauthorized modification or changes to this
device without the express approval of GE MDS may void the users authority to
operate this device. Furthermore, the unit is intended to be used only when installed
in accordance with the instructions outlined in this document. Failure to comply with
these instructions may also void the users authority to operate this device.
Industry Canada
RSS Notice
Operation is subject to the following two conditions: (1) this device may not cause
interference, and (2) this device must accept any interference, including interference
that may cause undesired operation of the device.

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