ESCO Technologies ETS LINDGREN 3127 User manual

Model 3127
Resonant Loop Antenna
User Manual
399277 Rev EApril, 2020

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ETS-Lindgren Inc. reserves the right to make changes to any products herein to improve functioning or design.
Although the information in this document has been carefully reviewed and is believed to be reliable, ETS-Lindgren
does not assume any liability arising out of the application or use of any product or circuit described herein; nor does
it convey any license under its patent rights nor the rights of others. All trademarks are the property of their respective
owners.
© Copyright 2014-2020 written permission from ETS-Lindgren Inc. All Rights Reserved. No part of this
document may be copied by any means without written permission from ETS Lindgren Inc.
Trademarks used in this document: The ETS-Lindgren logo is a registered trademark of ETS-Lindgren, Inc.; Teon is a
registered trademark of E. I. du Pont de Nemours and Company or its a󰀩liates.
Revision Record
MANUAL, 3127 | Part # 399277 Rev E
Revision Description Date
AInitial Release January, 2004
BUpdated branding: Revised to meet
Style Guide specications; PIB
included with release; added list of
available frequencies.
July, 2009
CAdded Model 3127 5500. July, 2014
DRevised design of Model 3127 5500. May, 2016
EUpdated Gain information in
Introduction; updated model list;
added 3127-450 and 3127-3600
models physical specs
April, 2020

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TABLE OF CONTENTS
NOTES, CAUTIONS AND WARNINGS 7
SAFETY INFORMATION 7
GENERAL SAFETY CONSIDERATIONS 8
INTRODUCTION 9
ETS-Lindgren Product Information Bulletin . . . . . . . . . . . . . . . . . . . . 10
MAINTENANCE 11
Maintenance Recommendations . . . . . . . . . . . . . . . . . . . . . . . . 11
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Service Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Contacting ETS-Lindgren . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Sending a Component for Service . . . . . . . . . . . . . . . . . . . . . . . 11
Calibration Services and Annual Calibration . . . . . . . . . . . . . . . . . . . 11
SPECIFICATIONS 13
Electrical Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Physical Specications (General) . . . . . . . . . . . . . . . . . . . . . . . . 13
Physical Specications 3127-450 . . . . . . . . . . . . . . . . . . . . . . . . 13
Physical Specications 3127-3600 . . . . . . . . . . . . . . . . . . . . . . . . 14
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Physical Specications 3127-5500 . . . . . . . . . . . . . . . . . . . . . . . . 14
OPERATION 15
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Operational Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . 15
APPENDIX A: WARRANTY 17
Duration of Warranty for 3127 Resonant Loop Antenna . . . . . . . . . . . . . . . . 17

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NOTES, CAUTIONS AND WARNINGS
Note: Denotes helpful information intended to provide tips for better use of
the product.
Caution: Denotes a hazard. Failure to follow instructions could result in
minor personal injury and/or property damage. Included text gives proper
procedures.
Warning: Denotes a hazard. Failure to follow instructions could result in
SEVERE personal injury and/or property damage. Included text gives proper
procedures.
SAFETY INFORMATION
Refer to Manual: When product is marked with this symbol, see the
instruction manual for additional information. If the instruction manual has
been misplaced, download it from www.ets-lindgren.com, or contact ETS
Lindgren Customer Service.
High Voltage: Indicates presence of hazardous voltage. Unsafe practice
could result in severe personal injury or death.
High Voltage: Indicates presence of hazardous voltage. Unsafe practice
could result in severe personal injury or death.
Protective Earth Ground (Safety Ground): Indicates protective earth
terminal. You should provide uninterruptible safety earth ground from the
main power source to the product input wiring terminals, power cord, or
supplied power cord set.
See the ETS-Lindgren Product Information Bulletin for safety, regulatory, and other product marking
information.

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GENERAL SAFETY CONSIDERATIONS
Before power is applied to this instrument, ground it properly through the
protective conductor of the AC power cable to a power source provided with
the protective earth contact. Any interruption of the protective (grounding)
conductor, inside or outside the instrument, or disconnection of the protective
earth terminal could result in personal injury.
Before servicing: contact ETS-Lindgren – servicing (or modifying) the unit by
yourself may void your warranty. If you attempt to service the unit by yourself,
disconnect all electrical power before starting. There are voltages at many
points in the instrument which could, if contacted, cause personal injury.
Only trained service personnel should perform adjustments and/or service
procedures upon this instrument. Capacitors inside this instrument may still
be CHARGED even when instrument is disconnected from its power source.
Only qualied personnel should operate (or service) this equipment.
WARNING: It has been determined through testing that the application of
additional labels of any kind (i.e. calibration labels, asset labels, etc.) will
adversely a󰀨ect the characteristics of Model 3127.
WARRANTY

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INTRODUCTION
ETS-Lindgren Model 3127 Resonant Loop Antennas are magnetic dipole antennas designed to meet the Cellular
Telecommunication and Internet Association’s (CTIA) +/- 0.1 dB symmetry requirement for ripple test measurements
at the labeled center frequency. These omni-directional antennas have a magnetic dipole pattern approaching that of
a half wave resonant electric dipole. The pattern produced has the same peak and null orientation as that of a sleeve
dipole oriented along the same axis, but with the directions of the electric and magnetic elds reversed. That is, the
electric eld vector along the azimuth is perpendicular to the axis and the magnetic eld vector is parallel to the axis.
The loop design allows the antenna to be end-fed to avoid cable and feed-point interactions that interfere with the
symmetry of the antenna. Integral quarter-wave chokes and/or ferrite loading (depending on frequency range) also help
to reduce cable interaction. This design also provides exceptional symmetry to meet the CTIA criteria for ripple test
antennas.
All Model 3127 antennas are designed with better than +/- 0.1 dB symmetry (0.2 dB peak-to-null) in at least a +/- 5 MHz
band around the labeled center frequency. For reference purposes, gain and symmetry values are provided for a 10
MHz band, depending on model, centered about the labeled frequency. The loops have nominal 50 ohm impedance, a
maximum continuous transmit power of one watt, and are equipped with a female SMA connector.
The loops are calibrated using an A2LA accredited process with a typical measurement uncertainty on the order
of +/- 1.0 dB at the center frequency. During the calibration process, the dipoles are also certied to meet ± 0.1 dB
symmetry required for use in the ripple test specied in the CTIA’s Over-The-Air Performance Test Plan, in a +/- 5
MHz band around the labeled center frequency. Maximum ripple, VSWR, and approximate gain values are provided
with each calibration. Note that the gain values provided with this calibration are for diagnostic reference purposes
only. For accurate gain values to perform range calibration, the Model 3126 Precision Reference Sleeve Dipoles are
recommended. Individual calibration data is included with each dipole. Gain value is not provided with the 3127-3600
and 3127-5500 Loops. Any gain data provided for any 3127 loop is for reference only.
The Model 3127 antenna family covers a range of frequencies intended for characterization of wireless chambers
including, but not limited to, the following models:
3127-450 3127-1575 3127-2132
3127-617 3127-1732 3127-2140
3127-700 3127-1747 3127-2450
3127-722 3127-1768 3127-2535
3127-836 3127-1800 3127-2655
3127-880 3127-1868 3127-3600
3127-897 3127-1880 3127-5500
3127-920 3127-1950
The digits following the hyphen in the model name note the center frequency of the antenna. For example, Model
3127 450 has a center frequency of 450 MHz. This manual applies to the frequencies listed, as well as any custom
frequencies.
Standard Conguration
• Model 3127 antenna
• A2LA accredited precision calibration and symmetry certication included signed certicate of calibration

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ETS-Lindgren Product Information Bulletin
See the ETS-Lindgren Product Information Bulletin included with your shipment for the following:
• Warranty information
• Safety, regulatory, and other product marking information
• Steps to receive your shipment
• Steps to return a component for service
• ETS-Lindgren calibration service
• ETS-Lindgren contact information