ESCO Technologies 3126C Series User manual

Model 3126C Series
Sleeve Dipole Antenna
Product Manual
PN: 1723532
August, 2023
Rev C
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 2022-2023 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, 3126C | Part # 1723532 Rev C
Revision Description Date
AInitial Release January, 2021
BUpdate to match antenna version November, 2022
CAdded 3126C-6500 August, 2023

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TABLE OF CONTENTS
NOTES, CAUTIONS AND WARNINGS 4
INTRODUCTION 5
Standard Conguration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Physical Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 Bulletin for safety, regulatory, and other product marking
information

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WARRANTY
Only qualied 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.
1.0 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 Conguration
• Model 3126C Sleeve Dipole Antenna
• Accredited Calibration certicate 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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2.0 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 o󰀩ces, 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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3.0 Specications
Performance Specications
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
MHz at center frequency.
3126C-4500 4 GHz to 5 GHz
3126C-6500 6 GHz to 7.2 GHz
Model VSWR Entire
Band
Gain
(MHz)
Calibration Range
(MHz)
Pts
per
Trace
Upper
Limit
From-To
(MHz)
Lower
Limit
Upper
Limit
From-To Span
3126C-3500 1.75:1 3000-4000 1.0 2.2 3000-4000 1000 501
3126C-4500 1.75:1 4000-5000 1.0 2.2 4000-5000 1000 501
3126C-6500 1.75:1 6000-7200 1.0 2.2 6000-7000 1000 601
Electrical Specications
Maximum Continuous Power 1 Watt
Impedance (Nominal) 50 Ohms
Connector SMA
Physical Specications
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-6500 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 qualied 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.
4.0 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 signicantly change the performance of the
antenna and a󰀨ect 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 Teon®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 adapter combination is available to allow attaching
the cable to the Teon socket adapter and sliding the antenna with blind mate connector
adapter 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 o󰀨ers 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.
5.0 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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