GE MDS DS-ENETL2TU ENET-L2TU 40 watt amplifier User Manual GE MDS TD220 Manual

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Date Submitted	2015-03-11 00:00:00
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Document Title	GE MDS TD220 Manual
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Document Author:	Microwave Data Systems

05-4186A01-eNETL2TUV_Manual_RevD.doc
GE MDS eNETL2T/U/V Manual
P/N 05-4186A01 Rev D.
05-4186A01 Rev. D
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Table of Contents
Important Information ............................................................................................................................................................ 3
1.1 RF Exposure ......................................................................................................................................................................... 3
1.2 FCC Approval Notice ....................................................................................................................................................... 3
1.3 FCC Part 80 Information ............................................................................................................................................... 3
1.4 FCC Part 90 Information ............................................................................................................................................... 3
1.5 FCC Part 95 Information ............................................................................................................................................... 3
Introduction .................................................................................................................................................................................. 4
2.1 Product Description ......................................................................................................................................................... 4
2.2 Power Control Loop Modes ......................................................................................................................................... 4
Interfaces ....................................................................................................................................................................................... 5
3.1 J101 Control Interface ................................................................................................................................................... 5
3.2 J102 RF Output .................................................................................................................................................................. 5
3.3 J103 RF Input ...................................................................................................................................................................... 5
3.4 J104 External/Internal Keying Jumper ................................................................................................................. 5
3.5 R112 Power Control Adjustment .............................................................................................................................. 5
Installation ..................................................................................................................................................................................... 6
4.1 Mounting the Unit ............................................................................................................................................................. 6
4.2 Connecting the Unit ........................................................................................................................................................ 6
Unit Specifications ..................................................................................................................................................................... 7
Technical Assistance ................................................................................................................................................................ 7
Change Log ................................................................................................................................................................................... 7
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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 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.
1.2 FCC Approval Notice
This device is offered as a licensed transmitter per FCC Parts 80, 90 and 95. It is approved for use
under the following conditions: Changes or modifications not expressly approved by GE MDS, LLC will
void the user’s authority to operate the equipment.
1.3 FCC Part 80 Information
For FCC Part 80, valid frequencies are 216-218 MHz pursuant to Part 80.385 at up to 40 watts input to
the antenna terminals (as per this product’s grant) pursuant to Part 80.215(h)(5).
1.4 FCC Part 90 Information
For FCC Part 90, valid frequencies are 217-220 MHz at up to 2 Watts input to the antenna terminal
pursuant to Part 90.259 or 220-222 MHz at up to 500 Watts Effective Radiated Power (ERP) pursuant to
Part 90.729 and applicable antenna height restrictions.
1.5 FCC Part 95 Information
For FCC Part 95, valid frequencies are 218-219 MHz. The Effective Radiated Power (ERP) must be less
than or equal to 4 Watts for mobile use and 20 Watts for fixed use pursuant to Part 95.855. This can
be accomplished by adjusting the output power of the amplifier and selecting an antenna with
appropriate gain. Consult the following table for assistance in setting the output power and selecting
an antenna to maintain compliance. The table provides examples, however other combinations can
be used.
Amplifier Power Setting
2W
4W
2W
10 W
20 W
05-4186A01 Rev. D
ERP
4W
4W
20 W
20 W
20 W
Maximum Antenna Gain
3 dBd (5.2 dBi)
0 dBd (2.2 dBi)
10dBd (12.2 dBi)
3 dBd (5.2 dBi)
0 dBd (2.2 dBi)
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2 Introduction
The eNETL2T/U/V is an RF power amplifier designed for use in the 210–270 MHz frequency range at up
to 40 Watts. It is intended to serve as a 100% duty cycle amplifier for MDS entraNET 220 and
TD220 radios operating in point-to-multipoint repeater or base applications.
2.1 Product Description
The eNETL2T/U/V 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 6 Amperes. The DC power source should be current
limited or have a protective fuse or circuit breaker.
2.2 Power Control Loop Modes
The amplifier can operate in two modes; External or Internal Control Loop. In External mode, a cable
feeds the output power level back to the transceiver (typically an entraNET 220) which adjusts its drive
to attain the power setpoint. In Internal mode, a feedback circuit within the amplifier performs
this function. In both cases, the setpoint 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 via the control cable attached at J101 and by RF detection within the PA.
Figure 1 – J104 and R112 Locations
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3 Interfaces
3.1 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
3.2 J102 RF Output
J102 is a 50 Ohm Female Type N connector.
3.3 J103 RF Input
J103 is a 50 Ohm Female Type N connector.
3.4 J104 External/Internal Keying Jumper
J104 is a jumper block with 3 pins. Shorting pins 1 and 2 (EXT) enables an external transceiver to key
the amplifier via J101. Shorting pins 2 and 3 (INT) enables the amplifier’s internal power detector to
key the amplifier. Access to this jumper block is via a hole in the top cover.
3.5 R112 Power Control Adjustment
R112 is used to adjust the RF power output of the amplifier in both internal and external keying modes.
Turn the potentiometer clockwise for higher power and counterclockwise for lower power.
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4 Installation
4.1 Mounting the Unit
The eNETL2T and eNETL2V are 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.
4.2 Connecting the Unit
Place the amplifier module in service by making the following cable connections.
1.
2.
3.
4.
5.
Using low loss 50-ohm coaxial cable, connect the RF Input connector (J103) to the RF output
connector of the MDS 220 MHz radio.
Using low loss 50-ohm coaxial cable, connect the RF Output connector (J102) to the station
duplexer or antenna.
For use with TD220 or other 220 MHz radios without a control interface, follow these substeps:
a. Move Jumper J104 to the Internal Keying position as shown in Figure 2 and leave
J101 open. Access to J104 is available through a top cover vent slot.
For use with entraNET 220, follow these sub-steps:
a. Move Jumper J104 to the External Keying position as shown in Figure 2. Access to
J104 is available through a top cover vent slot.
b. Connect the Power Control interface (J101) to the MDS 220 MHz radio in accordance
with the pin connections listed in below. J101 is an 8-pin Molex polarized connector.
Connect 10-16 Vdc power supply to the Power connector (J100). The left pin is positive (+); the
right is negative(–).
This completes the installation procedure. The remainder of this guide provides steps for power output
check/adjustment, lists specification data, and agency approval information.
Adjusting RF Power Output
To check/set the amplifier’s RF power output, proceed as follows.
1.
2.
3.
4.
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.
Apply RF drive from 220 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.
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5 Unit Specifications
Table 2 – Unit Specifications
Parameter
Specification
Operating Voltage
10-16 Vdc
Maximum Current Draw
6 Amperes @ 12.5V, 40W RF Out.
RF Drive Power
100 mW typical, 2W maximum
RF Out
+40 to +46 dBm (10-40 watts), adjustable
Duty Cycle (T, V models)
100% up to full output power
Duty Cycle (U model)
100% at 2 Watts, 30% above 2 Watts
Operating Frequency
210–270 MHz*
Mounting
standard 19-inch rack cabinet
Approximate Weight
5.15 lbs.
Dimensions (T, V models)
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)
FCC Identifier
E5MDS-ENETL2TU
Name of Grantee
GE MDS LLC
* For eNETL2T/U, specifications may vary outside 217–222 MHz. For eNETL2V, specifications may vary
outside 256–261 MHz.
6 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
7 Change Log
Version
Date
N/A
N/A
2015-01-30
2015-02-17
05-4186A01 Rev. D
Author
T. Mayo
T. Mayo
T. Mayo
T. Mayo
Changes
Initial release
Updates
Converted to new format. Updated FCC information.
Updated Part 80 maximum transmit power to match grant.
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Title                           : GE MDS TD220 Manual
Author                          : Microwave Data Systems
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