ESCO Technologies ETS-Lindgren 3126 Series User manual

Model 3126 Series
Sleeve Dipole Antenna
Product Manual
PN: 1723532
November, 2022
Rev B
ets-lindgren.com

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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 2022 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.;
Teflon is a registered trademark of E. I. du Pont de Nemours and Company or its affiliates.
Revision Record
MANUAL, 3126C | Part # 1723532 Rev B
Revision Description Date
AInitial Release January, 2021
BUpdate to match antenna version November, 2022

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TABLE OF CONTENTS
NOTES, CAUTIONS AND WARNINGS 4
INTRODUCTION 5
Standard Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
ETS-Lindgren Product Information Bulletin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
MAINTENANCE 6
Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Service Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Contacting ETS-Lindgren . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Sending a Component For Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Calibration Services and Annual Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
SPECIFICATIONS 7
Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
MOUNTING 8
OPERATION 9

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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.
*All notes, cautions, and warnings will be located on the left column area of the page.
See the ETS-Lindgren Product Information BulletinProduct Information Bulletin for safety, regulatory, and other product
marking information

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WARRANTY
Only qualified
personnel should
operate (or service)
this equipment.
If you have any
questions concerning
maintenance, contact
ETS-Lindgren Technical
Support. Warranty may
be voided if housing is
opened.
See the ETS-Lindgren
Product Information
Bulletin for safety,
regulatory, and other
product marking
information.
ETS-Lindgren may
substitute a similar
part or new part
number with the same
functionality for another
part/part number.
Contact ETS-Lindgren
for questions about part
numbers and ordering
parts.
INTRODUCTION
The ETS-Lindgren Model 3126C Series Sleeve Dipole antennas are
omnidirectional, having an electric dipole pattern approaching that of a half wave
resonant dipole.
The sleeve dipole design allows the antenna to be end fed to avoid cable and feed
point interactions that interfere with the performance of the antenna. Integral
quarter wave chokes and ferrite loading also help to reduce cable interaction. The
max VSWR is 1.75:1 through the entire band. Symmetry is <±0.2 dB throughout
the frequency range. The dipoles have nominal impedance of 50 Ω, a maximum
continuous transmit power of one watt, and are equipped with a female SMA
connector.
Standard Configuration
• Model 3126C Sleeve Dipole Antenna
• Accredited Calibration certificate for the VSWR, Gain and Symmetry
ETS-Lindgren Product Information Bulletin
See the ETS-Lindgren Product Information Bulletin included with your
shipment for the following:
• 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

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MAINTENANCE
Cleaning
Maintenance of the Model 3126 is limited to external components such as cables
or connectors.
If the 3126C requires cleaning, use a clean soft cloth moistened with water. Do
not use any harsh or abrasive chemicals; they may damage the components.
Service Procedures
Contacting ETS-Lindgren
Please see ets-lindgren.com for a list of ETS-Lindgren offices, including phone
and email contact information.
Sending a Component For Service
For the steps to return a system or system component to ETS-Lindgren for
service, see the Product Information Bulletin included with your shipment.
Calibration Services and Annual Calibration
See the Product Information Bulletin included with your shipment for
information on ETS-Lindgren calibration services.
ETS-Lindgren may
substitute a similar
part or new part
number with the same
functionality for another
part/part number.
Contact ETS-Lindgren
for questions about part
numbers and ordering
parts.

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SPECIFICATIONS
Performance Specifications
Model Range Pass/Fail Criteria
3126C-3500 3 GHz to 4 GHz a) Symmetry < 0.2dB through entire Calibration Range
b) Max VSWR is 1.75:1 through entire band.
c) Gain for 3126C-3500 must be greater than 1.0 at center
frequency.
3126C-4500 4 GHz to 5 GHz
3126C-5500 6 GHz to 7.2 GHz
Model VSWR Entire Band Gain Calibration Range (MHz) Pts per Trace
Upper
Limit
From-To Lower
Limit
Upper
Limit
From-To Span
(MHz)
3126C-3500 1.75:1 3000-4000 1.0 2.2 3000-4000 1000 501
3126C-4500 1.75:1 4000-5000 2.2 4000-5000 1000 501
3126C-5500 1.75:1 6000-7200 2.2 6000-7000 1000 601
Electrical Specifications
Maximum Continuous Power 1 Watt
Impedance (Nominal) 50 Ohms
Connector SMA
Physical Specifications
Model Diameter A Diameter B Overall Length Weight
3126C-3500 1.9 cm (0.75 in) 7.62 cm (3.00 in) 20.83 cm (8.20 in) 0.13 kg (0.29 lb)
3126C-4500 1.9 cm (0.75 in) 7.62 cm (3.00 in) 20.83 cm (8.20 in) 0.13 kg (0.29 lb)
3126C-5500 1.9 cm (0.75 in) 7.62 cm (3.00 in) 20.83 cm (8.20 in) 0.13 kg (0.29 lb)
A
B

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3126C antennas are
precision measurement
devices. Handle your
antenna with care.
WARRANTY
Only qualified
personnel should
operate (or service)
this equipment.
If you have any
questions concerning
maintenance, contact
ETS-Lindgren Technical
Support. Warranty may
be voided if housing is
opened.
ETS-Lindgren may
substitute a similar
part or new part
number with the same
functionality for another
part/part number.
Contact ETS-Lindgren
for questions about part
numbers and ordering
parts.
MOUNTING
The Model 3126C Series Sleeve Dipole Antenna must be mounted to a support at
the connector end of the antenna. An ETS-Lindgren mounting kit is recommended
to support the antenna.
Under no circumstances should any mounting structure extend inward more
than 1.5 inches (38 mm) past the connector end of the antenna. This area
approaches the radiating element of the antenna and any material in this region
will significantly change the performance of the antenna and affect the accuracy
of the measurement. The mounting structure should have a low dielectric and a
minimum amount of mass in the region of the antenna.
When mounting to an ETS-Lindgren mounting kit:
• The antenna mount consists of a Teflon®sleeve with small clamp screws to
hold the antenna in place.
• Fixed length spacers are then attached to the mounting sleeve to position it at
each test position. For repeatable positioning, the antenna must be inserted
into the sleeve until it bottoms out in the socket, then the clamp screws should
be tightened symmetrically around the antenna to ensure that the axis of the
antenna is along the axis of the mount.
• Note that an RF cable must be attached to the antenna prior to inserting it into
the mounting socket.
• An optional blind mate socket and adaptor combination is available to allow
attaching the cable to the Teflon socket adapter and sliding the antenna with
blind mate connector adaptor into the RF socket.
Ferrite loaded RF cables are recommended for use with the Model 3126C to
minimize the interaction with the dipole. ETS-Lindgren offers a line of ferrite
loaded cables for this application. Lightweight RF cabling should be used and
properly supported to avoid putting unnecessary load on the SMA connector of
the antenna. Route cabling away from the antenna along the antenna axis for as
far away as is practical to minimize the interaction of the cable with the antenna
and to avoid distortion of the antenna pattern.

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Before placing into
operation, follow the
safety information
in the ETS-Lindgren
Product Information
Bulletin included with
your shipment.
OPERATION
It is recommended that a 10 dB pad/attenuator be used at the input end of the
Model 3126C Series Sleeve Dipole to minimize standing waves on the transmit
cable. This is especially important for frequencies where the input VSWR is greater
than 1.2:1.
The electric field of the antenna is polarized parallel to the antenna axis. The
specified antenna gain is realized along the plane perpendicular to the antenna
axis and centered at the center of the dipole elements. The center of the dipole
elements (bore sight location) is indicated by a line marked on the dipole,
approximately 5.9 inches (15 cm) from the base (connector end) of the antenna
housing.

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