ETS-Lindgren 3101, 3102, 3103 User Manual
Model 3100 Series
Conical Log Spiral
Antennas
User Manual
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ETS-Lindgren Inc. 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 Inc. assuming any liability
whatsoever arising out of the application or use of any product or circuit
described herein. ETS-Lindgren Inc. does not convey any license under its
patent rights or the rights of others.
© Copyright 2002–2013 by 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 trademark of
ETS-Lindgren Inc.
Revision Record | MANUAL,3101,3102,3103 | Part #399276, Rev. C
Revision
Description
Date
A
Initial Release
September, 2002
B
Updated Gain chart for Model 3101;
rebrand
July, 2008
C
Updated illustrations in Circular
Polarization
March, 2013
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Table of Contents
Notes, Cautions, and Warnings ................................................ v
1.0 Introduction .......................................................................... 7
Standard Configuration ............................................................................... 7
Optional Items ............................................................................................ 8
Right-Hand Circular Polarization ......................................................... 8
Tripod Options .................................................................................... 8
ETS-Lindgren Product Information Bulletin ................................................. 9
2.0 Maintenance ....................................................................... 11
Maintenance Recommendations ............................................................... 11
Annual Calibration .................................................................................... 11
Replacement and Optional Parts .............................................................. 12
Service Procedures .................................................................................. 12
3.0 Specifications ..................................................................... 13
Electrical Specifications ............................................................................ 13
Physical Specifications ............................................................................. 13
4.0 Mounting Instructions ....................................................... 15
Using Included Mounting Adapters ........................................................... 15
Model 3101 ....................................................................................... 16
Model 3102 ....................................................................................... 17
Model 3103 ....................................................................................... 18
5.0 Circular Polarization .......................................................... 19
Left-Hand Circular Polarization ................................................................. 19
Right-Hand Circular Polarization ............................................................... 20
6.0 Typical Data ........................................................................ 21
Model 3101 ............................................................................................... 21
Model 3101 Antenna Factor .............................................................. 21
Model 3101 Gain .............................................................................. 22
Model 3101 VSWR ........................................................................... 22
Model 3101 Forward Power – 1 Meter .............................................. 23
Model 3102 ............................................................................................... 24
Model 3102 Antenna Factor .............................................................. 24
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Model 3102 Gain .............................................................................. 24
Model 3102 VSWR ........................................................................... 25
Model 3102 Forward Power – 1 Meter .............................................. 25
Model 3103 ............................................................................................... 26
Model 3103 Antenna Factor .............................................................. 26
Model 3103 Gain .............................................................................. 26
Model 3103 VSWR ........................................................................... 27
Model 3103 Forward Power – 1 Meter .............................................. 27
Appendix A: Warranty ............................................................. 29
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v
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.
See the ETS-Lindgren Product Information Bulletin for safety,
regulatory, and other product marking information.
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Introduction
7
1.0 Introduction
The ETS-Lindgren Model 3100 Series Conical Log Spiral antennas are
circularly polarized broadband antennas covering the frequency range of
100 MHz to 10 GHz. This family of antennas includes the Model 3101,
Model 3102, and the Model 3103. The Conical Log Spiral antennas are designed
specifically for EMI measurements and compliance testing as called for in various
Military Standards.
Each antenna is constructed of a fiberglass cone upon which two logarithmic
spirals of 50-ohm coaxial cable are securely fastened. Outside windings improve
heat dissipation. The coaxial connectors are located in the phenolic base plate of
the cone. A 1/4–20 adapter for a tripod or other mounting configuration is
attached to the antenna near its horizontal center of gravity or at the antenna
base plate.
The Conical Log Spiral antennas receive both circular polarized and linear
polarized fields (with a 3-dB variance for linear fields) under normal operating
conditions.
Model 3101, Model 3102, and Model 3103 are right-hand wound, and transmit
and receive a left-hand circularly polarized wave. Model 3101L, Model 3102L,
and Model 3103L are left-hand wound, and transmit and receive a right-hand
circularly polarized wave.
During the manufacturing process each antenna is individually calibrated at
1 meter per SAE ARP 958. Typical antenna data is included beginning on
page 21. Actual factors and a signed Certificate of Calibration Conformance are
shipped with each antenna.
Standard Configuration
Left-hand circular polarization
Support rod
Support base configured to accept ETS-Lindgren or other tripod mount
with standard 1/4–20 threads
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Introduction
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Optional Items
RIGHT-HAND CIRCULAR POLARIZATION
This option reverses the antenna windings for right-hand polarization.
See Circular Polarization on page 19.
TRIPOD OPTIONS
ETS-Lindgren offers the following nonmetallic, 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.
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Introduction
9
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 0.8 m
(31.8 in). This tripod can support a
13.5 kg (30 lb) load.
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
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