Model 3148B
Log Periodic
Dipole Array 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 1999–2008 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 3148 | Part #399239, Rev. D
Revision Description Date
A–C Initial Release; Updates November, 1999–
September, 2002
D Updated content to Model 3148B;
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
4.0 Mounting Instructions........................................................... 15
Using Included Mounting Adapters..............................................................15
Using the Stinger Mount ..............................................................................18
Additional Mounting Options........................................................................19
5.0 Application ........................................................................... 23
Emissions and Immunity..............................................................................23
Operation ..................................................................................................... 24
6.0 Typical Data ......................................................................... 27
Antenna Factor ............................................................................................27
Gain .............................................................................................................28
VSWR .......................................................................................................... 29
Half-Power Beamwidth ................................................................................30
7.0 Typical Radiation Patterns................................................... 31
400 MHz ......................................................................................................31
500 MHz ......................................................................................................32
600 MHz ......................................................................................................32
700 MHz ......................................................................................................33
800 MHz ......................................................................................................33
900 MHz ......................................................................................................34
1000 MHz ....................................................................................................34
| iii
1100 MHz ....................................................................................................35
1200 MHz ....................................................................................................35
1300 MHz ....................................................................................................36
1400 MHz ....................................................................................................36
1500 MHz ....................................................................................................37
1600 MHz ....................................................................................................37
1700 MHz ....................................................................................................38
1800 MHz ....................................................................................................38
1900 MHz ....................................................................................................39
2000 MHz ....................................................................................................39
Appendix A: Warranty ................................................................ 41
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 3148B Log Periodic Dipole Array is a
linearly-polarized broadband antenna designed to operate over the frequency
range of 200 MHz to 2 GHz. The choice of scaling factors, the various diameters
of each element, and the center-to-center spacing of the booms yield excellent
VSWR characteristics throughout the operating frequency range (see VSWR on
page 29). The precise design of the feed and the positioning of the elements on
the boom together yield an optimum phase relationship. This causes the active
region, at any given frequency, to propagate RF energy towards the smaller
elements, leaving the elements behind it electrically dead.
The Model 3148B antenna fully satisfies the CISPR-16 cross-polarization
rejection requirement, and has better than 20 dB cross-polarization rejection
below 1000 MHz. The constant gain of the antenna yields an antenna factor
which varies linearly with frequency as shown in Typical Data on page 27. The
variation is smooth; therefore, accurate interpolation of performance between
specified frequency points is simple.
The Model 3148B is constructed of lightweight, corrosion-resistant aluminum,
providing years of trouble-free indoor and outdoor service.
The Model 3148B includes an integral mount and the necessary attachments to
mount the antenna to either a tripod with a 1/4–20 threaded mount or an
ETS-Lindgren antenna mast. Individual antenna calibration data is included with
each antenna.
The Model 93148B is a non-characterized version of the Model 3148B. Should
calibration/characterization be desired please contact our calibration department.
A variety of mounting options are available for the Model 3148B. For information,
see Mounting Instructions on page 15.
Introduction | 7
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.
• 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.
8 | Introduction
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 3148B 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 3148B Log Periodic Dipole Array.
Part Description Part Number
Antenna Element, .375, 14.4 inches 105567-1
Antenna Element, .375, 16.4 inches 105567-2
Antenna Element, .250, 3.81 inches 105568-1
Antenna Element, .250, 5.02 inches 105568-3
Antenna Element, .250, 5.75 inches 105568-4
Antenna Element, .250, 6.57 inches 105568-5
Antenna Element, .250, 7.51inches 105568-6
Maintenance | 11
Part Description Part Number
Antenna Element, .250, 8.58inches 105568-7
Antenna Element, .250, 9.8 inches 105568-8
Antenna Element, .250, 11.18 inches 105568-9
Antenna Element, .250, 12.62 inches 105568-10
Antenna Element, .187, .99 inches 105569-1
Antenna Element, .187, 1.17 inches 105569-2
Antenna Element, .187, 1.37 inches 105569-3
Antenna Element, .187, 1.6 inches 105569-4
Antenna Element, .187, 1.86 inches 105569-5
Antenna Element, .187, 2.16 inches 105569-6
Antenna Element, .187, 2.50 inches 105569-7
Antenna Element, .187, 2.89 inches 105569-8
Antenna Element, .187, 3.32 inches 105569-9
Polarizing Mounting Adapter 100989
Thread Insert 105861B
For additional/optional mounting hardware, see Additional Mounting
Options on page 19.
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
3.0 Specifications
Electrical Specifications
Frequency Range: 200 MHz–2 GHz
VSWR Ratio: Average: 1.2:1
Maximum: 2.0:1
Maximum Continuous Power: 1 kW
Peak Power: 1.3 kW
Impedance: 50 Ω
Symmetry: ± 0.5 dB
Cross-Polarization Rejection: Better than 20 dB below
1000 MHz
Connector: Type N female
Physical Specifications
Height (without bracket assembly): 6.667 cm
2.625 in
Width (at widest point): 85.09 cm
33.50 in
Length
(including stinger):
Weight: 2.0 kg
86.677 cm
34.125 in
4.5 lb
Specifications | 13
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