ETS-Lindgren 3121D User Manual
Model 3121D
Adjustable Dipole
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 1998–2008 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 is a trademark of
ETS-Lindgren L.P.
Revision Record | MANUAL 3121 | Part #399041, Rev. D
Revision Description Date
A–C Initial Release; Updates October, 1998–
October, 2000
D Updated content to Model 3121D;
converted to half-size; rebranding
ii |
June, 2008
Table of Contents
Notes, Cautions, and Warnings ................................................... v
1.0 Introduction ............................................................................ 7
Tripod Options ...............................................................................................8
ETS-Lindgren Product Information Bulletin ...................................................9
2.0 Maintenance ........................................................................ 11
Annual Calibration .......................................................................................11
Replacement and Optional Parts.................................................................11
Service Procedures .....................................................................................12
3.0 Specifications....................................................................... 13
Electrical Specifications ............................................................................... 13
Physical Specifications ................................................................................13
Element Length Frequency Chart................................................................14
4.0 Assembly Instructions .......................................................... 17
5.0 Mounting Instructions........................................................... 21
Using Included Mounting Adapters..............................................................21
Using the Stinger Mount ..............................................................................23
Additional Mounting Options........................................................................24
4-TR Mounting Options........................................................................24
7-TR and Mast Mounting Options........................................................ 25
2x2 Boom Mounting Options ...............................................................26
6.0 Typical Data ......................................................................... 27
Model 3121D DB-1 Typical Data .................................................................27
Model 3121D DB-1 Gain......................................................................27
Model 3121D DB-1 Antenna Factor.....................................................28
Model 3121D DB-1 Typical Balun Loss ...............................................29
Model 3121D DB-2 Typical Data .................................................................30
Model 3121D DB-2 Gain......................................................................30
Model 3121D DB-2 Antenna Factor.....................................................31
Model 3121D DB-2 Typical Balun Loss ...............................................32
| iii
Model 3121D DB-3 Typical Data .................................................................33
Model 3121D DB-3 Gain......................................................................33
Model 3121D DB-3 Antenna Factor.....................................................34
Model 3121D DB-3 Typical Balun Loss ...............................................35
Model 3121D DB-4 Typical Data .................................................................36
Model 3121D DB-4 Gain......................................................................36
Model 3121D DB-4 Antenna Factor.....................................................37
Model 3121D DB-4 Typical Balun Loss ...............................................38
Appendix A: Warranty ................................................................ 39
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.
| v
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vi |
1.0 Introduction
The ETS-Lindgren Model 3121D
Adjustable Dipole Antenna System is
designed to operate over the 30 MHz to
1 GHz frequency range for
measurements to meet military, DOD,
VDE, and FCC EME measurement
specifications.
3121D DB-1
The Model 3121D includes the DB-1, DB-2, DB-3, and DB-4 antennas.
The antennas are lightweight and sturdily
constructed for portability and
ruggedness. A carrying case supplied
with the antenna set allows for organized
storage and access to all antenna
components. Also included is a
measuring tape for adjusting the dipole
elements to frequency.
3121D DB-2
The dipole elements are made from
nickel-plated brass extension elements
with four special extension rods for
operation at the lowest frequencies. Each
set of elements is designed to be
mounted into a particular balun.
3121D DB-3
Introduction | 7
The elements for baluns can be
extended to dipole lengths above and
below the specified frequency of each
particular balun. The elements should be
used with the specified balun and should
not be adjusted to frequencies beyond
the specified range of each balun. This is
to prevent errors in calibration of the
antenna receiving system.
A variety of mounting options are available for the Model 3121D. For information,
see Mounting Instructions on page 21.
Tripod Options
ETS-Lindgren offers the following nonmetallic, non-reflective tripods for use at
both indoor and outdoor EMC test sites.
• Model 4-TR—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.
3121D DB-4
8 | Introduction
• Model 7-TR—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.
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
Introduction | 9
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10 | Introduction
2.0 Maintenance
Before performing any maintenance, follow
the safety information in the ETS-Lindgren
Product Information Bulletin included with
your shipment.
WARRANT Y
Maintenance of the Model 3121D is limited
to external components such as cables or
connectors.
If you have any questions concerning
maintenance, contact ETS-Lindgren
Customer Service.
Annual Calibration
See the Product Information Bulletin included with your shipment for information
on ETS-Lindgren calibration services.
Replacement and Optional Parts
Following are the part numbers for ordering replacement or optional parts for the
Model 3121D Adjustable Dipole Antenna System.
Available For 3121D Model:
Part Description
DB-1 DB-2 DB-3 DB-4
Element, Low Frequency (2) √ √ 3121LE
Part
Number
Element, Medium Frequency
(2)
Element Extension,
19.5 inches (4)
Carrying Case √ √ √ √ 3121CASE
√ 3121EE
Maintenance | 11
√ 3121ME
Available For 3121D Model:
Part Description
DB-1 DB-2 DB-3 DB-4
Clamp Block √ √ √ √ 102108
Support Base √ √ √ √ 101942B
Support Rod √ √ √ √ 100733
For additional/optional mounting hardware, see Additional Mounting
Options on page 24.
Part
Number
Service Procedures
For the steps to return a system or system component to ETS-Lindgren for
service, see the Product Information Bulletin included with your shipment.
12 | Maintenance
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