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Model 3142D
BiConiLog™ Antenna
User Manual
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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 2000–2009 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, BiConiLog, and
MiniMast are trademarks of ETS-Lindgren L.P.
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Revision Record | MANUAL MODEL 3142 | Part #399229, Rev. I
Revision Description Date
A Initial Release November, 2000
B Update to new format, add
Model 3142 information
January, 2001
C Edit/update February, 2003
D Edit/update June, 2003
E Update bowtie/antenna knob
information
November, 2006
F Updated content to Model 3142D;
rebrand
December, 2008
G Updated Specifications; updated
Additional Mounting Options
illustrations
May, 2009
H Added part numbers for optional
end plate kit
October, 2009
I Added Typical Gain With and
Without End Plates to
Typical Data; updated Using the
Stinger to Mount to a Model 2175
MiniMast
December, 2009
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Table of Contents
Notes, Cautions, and Warnings .............................................. vii
1.0 Introduction .......................................................................... 9
Optional End Plates ....................................................................................... 9
Tripod Options ............................................................................................. 10
ETS-Lindgren Product Information Bulletin ................................................. 12
2.0 Maintenance ....................................................................... 13
Annual Calibration ....................................................................................... 13
Replacement and Optional Parts ................................................................. 14
Service Procedures ..................................................................................... 14
3.0 Specifications ..................................................................... 15
Electrical Specifications ............................................................................... 15
Physical Specifications ................................................................................ 15
4.0 Assembly Instructions ...................................................... 17
Attach Bow Tie Elements ............................................................................. 18
Attach Optional End Plates .......................................................................... 19
5.0 Mounting Instructions ....................................................... 21
Using Included Mounting Adapters .............................................................. 22
Using the Stinger to Mount to a Model 2175 MiniMast ................................ 24
Additional Mounting Options ........................................................................ 29
4-TR Mounting Options........................................................................ 29
7-TR and Mast Mounting Options ........................................................ 30
2x2 Boom Mounting Options ............................................................... 33
6.0 Application ......................................................................... 35
Without Optional End Plates ........................................................................ 35
With Optional End Plates ............................................................................. 36
7.0 Typical Data ........................................................................ 39
Typical Antenna Factor ................................................................................ 39
Typical Gain ................................................................................................. 40
Typical Gain With and Without End Plates .................................................. 41
Typical VSWR .............................................................................................. 42
Appendix A: Warranty ............................................................. 43
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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.
See the ETS-Lindgren Product Information Bulletin for safety,
regulatory, and other product marking information.
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Page 9
Introduction | 9
1.0 Introduction
The ETS-Lindgren Model 3142D BiConiLog™ Antenna is designed as a
dual-purpose antenna that can be used for both immunity and emission testing.
From 26 MHz to 60 MHz, the Model 3142D antenna with optional end plates
exhibits an average 5.5 dB gain improvement. At some frequencies, a 10 dB gain
improvement is achieved. Applications for the Model 3142D include emissions
testing, immunity measurements, and medical equipment testing.
The Model 3142D includes a stinger mount; it also includes a mounting bracket
and 1/4–20 thread knob to attach to an ETS-Lindgren tripod or tower adapter.
For the variety of mounting options available for the Model 3142D, see
Mounting Instructions on page 21.
Optional End Plates
Optional end plates
are available to
improve gain for
immunity testing.
This option consists
of two end plates that
are easily attached
and detached by
hand using captive
screw knobs. When
the end plates are
attached it creates a
T-shaped bow tie
element.
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10 | Introduction
For any dipole-type antenna to transmit or receive energy most efficiently, the
length must be nearly a half-wavelength, which is about 4.6 meters long at
30 MHz, and 2.8 meters long at 50 MHz. Unfortunately, this is too unwieldy for
many anechoic chambers and test sites. The optional end plates make it appear
like an antenna twice as long as the 1.4 meter length. The result is approximately
a 10 dB improvement in low frequency transmit gain and receive antenna factor
compared to a same length regular bow tie.
With the end plates attached to the Model 3142D bow tie elements, the
equivalent dipole electrical length is increased, which decreases resonant
frequency and increases efficiency in the 20 MHz to 60 MHz range. Similarly, the
regular bow tie has a lower resonant frequency than an equal length single wire
dipole. The optional end plate has its first resonance at a frequency where its
length is about 0.22
λ, a regular bow tie at a length of 0.3 λ, and a tuned dipole
at about a length of 0.48
λ. Thus, at 50 MHz the 1.4 meters-long end plate option
behaves as if a 2.8 meter tuned dipole. Cross-polar radiation is minimized
because current flow on one of the T end frames is almost completely cancelled
by the opposite-phased current on the other T end.
Tripod Options
ETS-Lindgren offers the following nonmetallic, non-reflective tripods for use at
both indoor and outdoor EMC test sites.
For easy horizontal and vertical polarization, the ETS-Lindgren
Model 7-TR tripod is recommended.
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Introduction | 11
• 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 0.8 m (31.8 in). This tripod
can support a 13.5 kg (30 lb) load.
• 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.
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12 | 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
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Maintenance | 13
2.0 Maintenance
Before performing any maintenance, follow
the safety information in the ETS-Lindgren
Product Information Bulletin included with
your shipment.
Maintenance of the Model 3142D 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.
WARRANTY
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14 | Maintenance
Replacement and Optional Parts
Following are the part numbers for ordering replacement or optional parts for the
Model 3142D BiConiLog™ Antenna.
Part Description Part Number
Polarizing Mounting Adapter 100989
Thread Insert 105861B
Optional End Plate Kit (includes):
• 113031 End Plate (1)
• 106364 Thumbscrew,
M4x12 (4)
113032 (2 each required)
For additional/optional mounting hardware, see Additional Mounting
Options on page 24.
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.
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Specifications | 15
3.0 Specifications
Electrical Specifications
With Standard Bow Tie Elements /
With Optional End Plates
Frequency Range: 26 MHz–6 GHz
Input Impedance (Nominal): 50 Ω
VSWR (Average): 2:1 above 50 MHz
Maximum Continuous Power: 1 kW
Peak Power: 1.3 kW
Pattern Type: Directional
Polarization: Linear
Connector: Type N female
Physical Specifications
Height: 76.2 cm (30.0 in)
Length: 166.1 cm (65.39 in)
Width: 133.0 cm (52.72 in)
Weight (Without End Plates): 7.7 kg (17.0 lb)
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16 | Specifications
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Assembly Instructions | 17
4.0 Assembly Instructions
Before connecting any components, follow the
safety information in the ETS-Lindgren
Product Information Bulletin included with your
shipment.
The Model 3142D BiConiLog™ Antenna consists of the following:
• Antenna
• Bow tie elements (2)
• 10–32 thumbscrew knobs to attach bow tie elements (2)
• Mounting bracket and mounting knob
• Protective end caps for bow tie elements (2)
• Screws to attach protective end caps to bow tie elements (8)
The optional end plate package consists of:
• End plates (2)
• Thumbscrew knobs to attach end plates to bow tie elements (8)
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18 | Assembly Instructions
Attach Bow Tie Elements
The Model 3142D ships with the bow tie elements detached. To attach the bow
tie elements:
1. For stability, mount the Model 3142D onto a tripod or tower. See
Mounting Instructions on page 21 for the steps to mount the antenna.
2. Slide the narrow end of one of the bow tie elements into the
receptacle hole on the antenna boom, and then align the bow tie with
the receptacle on the boom.
Do not cross thread this connection or
permanent damage to the bow tie element could
occur.
3. Insert one of the 10–32 thumbscrew knobs into the opposite side of the
antenna boom from where you inserted the bow tie. Slowly tighten the
knob, taking care not to cross thread the connection.
4. Repeat steps 2 and 3 for the second bow tie element.
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Assembly Instructions | 19
Attach Optional End Plates
1. For protection, there is a black end cap on each of the bow tie
elements. Use a Phillips screwdriver to carefully remove the
four screws in each of the bow tie end caps. Remove the end caps.
The end caps should be reinstalled when you are done using the
optional end plates, so store the end caps and the screws in a safe
place.
Do not cross thread this connection or
permanent damage to the bow tie element could
occur.
2. Align the four holes on the wide end of the bow tie element with the
four holes on the end plate. Insert each of the four thumbscrew knobs
in the holes and slowly tighten, taking care not to cross thread the
connection.
3. Repeat step 2 for the second end plate.
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20 | Assembly Instructions
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Mounting Instructions | 21
5.0 Mounting Instructions
Before connecting any components, follow the
safety information in the ETS-Lindgren
Product Information Bulletin included with your
shipment.
The Model 3142D is a precision measurement
device. Handle with care.
Contact with any metal or non-metallic structure can capacitively load the
antenna, which may cause unrepeatable results. Therefore, make sure that no
part of the dipole elements or bow ties is in contact with the tripod or tower,
particularly in vertically-polarized tests. Where possible, run the feed cable
straight one meter or more back from the Model 3142D BiConiLog™ Antenna
before dropping vertically.
Both horizontal and vertical polarization is easily accomplished when the
Model 3142D with the optional end plates is mounted onto a tower, but vertical
polarization on a tripod requires special consideration. Because immunity power
requirements are many dB lower for vertical polarization, the optional end plates
can be removed when mounting vertically on a standard tripod. A special tripod is
available from ETS-Lindgren for vertical polarization with optional end plates
intact. Please contact ETS-Lindgren for the recommended mounting scheme.
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22 | Mounting Instructions
Using Included Mounting Adapters
The Model 3142D ships with these mounting adapters:
• 100989 Polarizing Mounting
Adapter with 7/8–14 thread
receptacle
If you need to convert the polarizing
adapter to a 1/4–20 receptacle,
insert the 1/4–20 thread insert into
the polarizing adapter
• 105861B 1/4–20 Thread Insert
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Mounting Instructions | 23
To attach the included adapters to the Model 3142D:
Model 3142D
mounted onto 4-TR
using included
100989 Polarizing
Mounting Adapter
and 105861B
1/4–20 Thread
Insert
1. If required, insert the 1/4–20 thread insert into the polarizing adapter.
2. Remove the mounting knob from the mounting bracket on the antenna.
3. Slide the mounting bracket onto the polarizing adapter with the
polarizing adapter placed between the shoulders of the mounting
bracket.
4. Thread the mounting knob through the mounting bracket, then through
the polarizing adapter, and finally through the hex nut.
5. Tighten the mounting knob to secure the antenna.
Do not cross thread or permanent damage to the adapter and
thread insert could occur.
6. Attach the polarizing adapter and antenna to tripod or tower, as
required.
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24 | Mounting Instructions
Using the Stinger to Mount to a Model 2175 MiniMast
Do not use the stinger to mount the Model 3142D onto a 4-TR tripod.
The stinger mount provides on-axis rotation during 90
° horizontal or vertical
polarization. The stinger enables you to mount the antenna directly to an
ETS-Lindgren 7-TR Tripod or mast.
Before you begin:
• Install the center rotate boom (part# 108197) for rear-mount
stinger-type antennas onto the 7-TR.
• Attach the included mounting adapter to the Model 3142D as
instructed in Using Included Mounting Adapters on page 22.
• You will need one of the optional mounting knobs described in
7-TR and Mast Mounting Options on page 30. To order
optional mounting hardware, contact the ETS-Lindgren Sales
Department
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Mounting Instructions | 25
1. Thread the antenna
feed or receiving
cable through the
center of the boom
so that the antenna
connector emerges
a few inches out of
the clamp end of
the boom.
2. Attach the cable to
the Type N
connector at the
end of the stinger.
3. Slide the cable and
stinger into the
clamp on the boom,
carefully guiding
the cable out the
other end.
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26 | Mounting Instructions
4. When you reach
the back of the
balun box, align it
with the boom
receptacle, and
then slide the
smaller portion of
the balun box into
the boom. This will
prevent rotation of
the antenna unless
the boom is being
polarized.
5. Tighten the clamp
knobs on the boom
to secure the
antenna into place.
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Mounting Instructions | 27
6. Secure the antenna
by inserting the
antenna mount
knob through the
boom and into the
mounting adapter.
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28 | Mounting Instructions
Model 3142D mounted horizontally on Model 2175
Model 3142D rotated vertically on Model 2175
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Mounting Instructions | 29
Additional Mounting Options
4-TR MOUNTING OPTIONS
Following are additional options for mounting the Model 3142D onto an
ETS-Lindgren 4-TR tripod. Contact the ETS-Lindgren Sales Department for
information on ordering optional mounting hardware.
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30 | Mounting Instructions
7-TR AND MAST MOUNTING OPTIONS
The stinger on the Model 3142D enables you to mount to antenna directly to an
ETS-Lindgren 7-TR Tripod Positioner.
However, following are
additional options for
mounting the
Model 3142D onto an
ETS-Lindgren 7-TR
Tripod Positioner.
Contact the
ETS-Lindgren Sales
Department for
information on ordering
optional mounting
hardware.
Non-stinger method to mount Model 3142D to 7-TR
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Mounting Instructions | 31
Mast refers to 2070 Series, 2075, and 2175 Antenna Towers.
7-TR refers to 109042, 106328, and 108197 booms:
• 109042 boom—Straight boom; for general antenna mounting on a
7-TR
• 106328 boom—Offset boom; for general antenna mounting on a
7-TR with pneumatic or manual polarization
• 108197 boom—Center rotate boom; for rear-mount stinger-type
antennas only
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32 | Mounting Instructions
Model 3142D mounted horizontally
on 7-TR
Model 3142D mounted vertically
on 7-TR
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Mounting Instructions | 33
2X2 B
OOM MOUNTING OPTIONS
Following are additional options for mounting the Model 3142D onto a 2x2 boom.
Contact the ETS-Lindgren Sales Department for information on ordering optional
mounting hardware.
2x2 boom refers to a typical 2-inch by 2-inch boom.
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34 | Mounting Instructions
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Application | 35
6.0 Application
Without Optional End Plates
For emissions measurements, electric field strength in db[V/m] is obtained from:
E(dBV/m)=V(dBV)+AF(dB1/m)+ α(dB)
V
= the receiver or spectrum analyzer voltage reading
AF = antenna factor
α
= cable loss in dB, if cable losses are non-negligible
For immunity testing, the electric field strength generated at a distance d can be
approximated by:
()
E
Pg
d
V/m =
30
d = distance, in meters
g = numeric gain (10
G[dB]/10
)
P = antenna net input power, in watts
An estimate of the power required for any field strength E can be obtained from
the forward power graphs in Typical Data beginning on page 39, which shows
power required in watts to generate 1 V/m. For any other field strength not
shown, multiply the power in watts by the desired E-field squared, or:
P(E V/m) = E2 P(1 V/m)
Actual transmitted field strength should be verified using an ETS-Lindgren
electric field probe, or equivalent.
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36 | Application
An estimate of the power required, taking VSWR into account, is obtained from:
Pf = Pn / {1-[(VSWR-1)/(VSWR+1)]2}
Pf = forward (amplifier output) power
P
n
= new power, as discussed
For IEC/EN 31000-4-3 type testing, the antenna tip can be placed at any
distance between one and three meters from the EUT as long as the front face
plane is illuminated according to the -0, +6 dB uniform field specifications.
It is usually necessary to place RF absorbing material between the EUT and
antenna to suppress ground plane reflection to ensure the field uniformly, or to
conduct the immunity test in a fully-lined anechoic room. In general, closer
distances require less power to create a given field strength.
With Optional End Plates
For emissions testing it is recommended that the Model 3142D BiConiLog™
Antenna be used without the optional end plates. The coupling of the endplates
to ground will create higher uncertainty values, particularly in the vertical
polarization.
For immunity testing, the electric field strength generated at a distance d can be
approximated by:
()
E
Pg
d
V/m =
30
d = distance, in meters
g = numeric gain (10
G[dB]/10
)
P = antenna net input power, in watts
Actual transmitted field strength should be verified using an ETS-Lindgren
electric field probe, or equivalent.
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Application | 37
An estimate of the power required, taking VSWR into account, is obtained from:
Pf = Pn / {1-[(VSWR-1)/(VSWR+1)]2}
Pf = forward (amplifier output) power
P
n
= new power, as discussed
For IEC/EN 31000-4-3 type testing, the antenna tip can be placed at any
distance between one and three meters from the EUT as long as the front face
plane is illuminated according to the -0, +6 dB uniform field specifications.
It is usually necessary to place RF absorbing material between the EUT and
antenna to suppress ground plane reflection to ensure the field uniformly, or to
conduct the immunity test in a fully-lined anechoic room. In general, closer
distances require less power to create a given field strength.
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38 | Application
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Typical Data | 39
7.0 Typical Data
Typical Antenna Factor
Distance for the ANSI 3-meter and 10-meter calibrations is measured from the
antenna midpoint, and for SAE 1-meter calibrations the distance is measured
from the antenna tip. Midpoint is defined as half the distance between the small
elements and the bow ties, which is about 45 cm from the small end tip.
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40 | Typical Data
Typical Gain
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Typical Data | 41
Typical Gain With and Without End Plates
For frequencies above 60 MHz, use the Model 3142D BiConiLog™
Antenna without the end plates; additional gain is provided only when
using end plates for frequencies below 60 MHz.
Page 42
42 | Typical Data
Typical VSWR
Page 43
43 | Warranty
Appendix A: Warranty
See the Product Information Bulletin included with your shipment for
the complete ETS-Lindgren warranty for your Model 3142D
BiConiLog™ Antenna.
DURATION OF WARRANTIES FOR MODEL 3142D
All product warranties, except the warranty of title, and all remedies for warranty
failures are limited to two years.
Product Warranted Duration of Warranty Period
Model 3142D BiConiLog Antenna 2 Years
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