ETS-Lindgren 3149 User Manual
Model 3149
BiConiLog™ Antenna
User Manual
ETS-Lindgren L.P. reserves the right to make changes to any product described
herein in order to improve function, design, or for any other reason. Nothing
contained herein shall constitute ETS-Lindgren L.P. assuming any liability
whatsoever arising out of the application or use of any product or circuit
described herein. ETS-Lindgren L.P. does not convey any license under its
patent rights or the rights of others.
© Copyright 2003–2009 by ETS-Lindgren L.P. All Rights Reserved. No part
of this document may be copied by any means without written permission
from ETS-Lindgren L.P.
Trademarks used in this document: The ETS-Lindgren logo and BiConiLog are
trademarks of ETS-Lindgren L.P.
Revision Record | MANUAL, MODEL 3149 | Part #399283, Rev. B
Revision Description Date
A Initial Release November, 2003
B Rebrand May, 2009
ii |
Table of Contents
Notes, Cautions, and Warnings ................................................ v
1.0 Introduction .......................................................................... 7
Standard Configuration .................................................................................. 8
Tripod Options ............................................................................................... 9
ETS-Lindgren Product Information Bulletin ................................................. 10
2.0 Maintenance ....................................................................... 11
Annual Calibration ....................................................................................... 11
Replacement and Optional Parts ................................................................. 11
Service Procedures ..................................................................................... 11
3.0 Specifications ..................................................................... 13
Electrical Specifications ............................................................................... 13
Physical Specifications ................................................................................ 13
4.0 Bow Tie Assembly Instructions ....................................... 15
5.0 Mounting Instructions ....................................................... 17
Using Included Mounting Adapters .............................................................. 17
Using the Stinger Mount .............................................................................. 19
Additional Mounting Options ........................................................................ 20
4-TR Mounting Options........................................................................ 20
7-TR and Mast Mounting Options ........................................................ 21
2x2 Boom Mounting Options ............................................................... 22
Other Mounting Options ....................................................................... 23
6.0 Application ......................................................................... 25
7.0 Typical Data ........................................................................ 27
Model 3149 Antenna Factor at 10m ............................................................ 27
Model 3149 Gain at 10m ............................................................................. 28
Model 3149 Forward Power ......................................................................... 29
Model 3149 Horizontal Measured Power ..................................................... 30
Model 3149 Vertical Measured Power ......................................................... 31
Appendix A: Warranty ............................................................. 33
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iv |
Notes, Cautions, and Warnings
Note: Denotes helpful information intended to
See the ETS-Lindgren Product Information Bulletin for safety,
regulatory, and other product marking information.
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.
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vi |
1.0 Introduction
The ETS-Lindgren
Model 3149 BiConiLog™ is a
dual-purpose antenna that can
be used for both emissions
and immunity applications. The
Model 3149 is a hybrid linearly
polarized EMC antenna
consisting of a log periodic
dipole array (LPDA) and a
single bow tie antenna.
The Model 3149 has an ultra broadband frequency range, accepts high power
input, and is size-efficient for easy transport and use in compact chambers.
Rugged construction assures dimensional and electrical stability over extended
use.
The BiConiLog antenna combines the best characteristics of biconical and log
periodic antennas, sweeping over a wide frequency range and making it ideal for
automated testing. The 80 MHz to 5 GHz frequency range of the Model 3149 is
the broadest and highest of all BiConiLog antennas and most commercially
available antennas of this type.
The Model 3149 accepts up to 800 W of peak power input at the lower
frequencies of operation. The high gain and low VSWR over the operating
frequency range translate into efficient amplifier use for field generation. The
Model 3149 differs from most biconical and log periodic hybrids with relatively
low VSWR at the lower frequencies of operation, allowing about half the power to
be radiated by the antenna.
Antenna performance can be degraded by cross polarization of horizontal and
vertical signals. In high frequency log periodic antennas where elements are
small and closely spaced, cross polarization can be difficult to avoid. The high
frequency section of the Model 3149 was modeled and precision manufactured
to avoid this problem. Cross polarization rejection in the Model 3149 exceeds
20 dB, making this antenna one of the few antennas that are compliant for
CISPR16-1 measurements.
Introduction | 7
An antenna constructed to maximize structural integrity is better able to maintain
its electrical properties; the benefits are better measurement repeatability, lower
uncertainty values, and longer calibration validity. The Model 3149 is able to
thrive in an environment of constant use due to its rugged construction and the
implementation of these design elements:
• Custom aluminum extrusions are used for the boom material.
• Dipole elements connect with capped Allen screws for secure
attachment, yet allow repair and replacement as necessary.
• An all-weather, energy absorbing radome protects the high frequency
element.
• Tubular bow tie elements connect to the balun box using positive
aligning and easily attached compression fittings.
• The finished antenna receives a durable powder coat finish.
The Model 3149 provides a flexible mounting scheme to accommodate most
antenna towers and tripods. The antenna can be securely mounted using the
22-mm diameter stinger or the lower element boom mount.
• The stinger mount provides on-axis center point rotation of the antenna
during polarization and can be mounted to ETS-Lindgren and most
other brands of antenna towers.
• The lower element boom mount on the Model 3149 can be used with
all tripods and with ETS-Lindgren antenna masts that have an offset
cross boom.
For the steps to mount the Model 3149, see Mounting Instructions on page 17.
Standard Configuration
• Antenna
• Bow tie elements (2)
• Wrenches (2) attached to the balun box for use on bow tie
compression fittings
• Lower element boom mount includes mounting bracket and
mounting knob
8 | Introduction
Tripod Options
ETS-Lindgren offers the following non-metallic, non-reflective tripods for use at
both indoor and outdoor EMC test sites.
• 4-TR Tripod—Constructed of linen
phenolic and delrin, designed with an
adjustable center post for precise height
adjustments. Maximum height is 2.0 m
(80.0 in), and minimum height is 94 cm
(37.0 in). This tripod can support up to
an 11.8 kg (26.0 lb) load.
• 7-TR Tripod—Constructed of PVC and
fiberglass components, providing
increased stability for physically large
antennas. The unique design allows for
quick assembly, disassembly, and
convenient storage. Allows several
different configurations, including options
for manual or pneumatic polarization.
Quick height adjustment and locking
wheels provide ease of use during
testing. Maximum height is 2.17 m
(85.8 in), with a minimum height of .8 m
(31.8 in). This tripod can support a
13.5 kg (30 lb) load.
Introduction | 9
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
10 | Introduction
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