Emco 3104C User Manual

Model 3104C

Biconical Antenna

MANUAL

© EMC TEST SYSTEMS, L.P. – SEPTEMBER 2002 REV E – PN 399034

MODEL 3104C BICONICAL ANTENNA

EMC Test Systems, L.P. reserves the right to make changes to any products herein to improve functioning,
design, or for any other reason. Nothing contained herein shall constitute EMC Test Systems, L.P.
assuming any liability whatsoever arising out of the application or use of any product or circuit described
herein. EMC Test Systems, L.P. does not convey any license under its patent rights or the rights of others.

© Copyright 2002 by EMC Test Systems, L.P. All Rights Reserved.

No part of this document may be copied by any means

without written permission from EMC Test Systems, L.P.

E-MAIL & INTERNET

[e-mail]
http://www.ets-lindgren.com

USA

1301 Arrow Point Dr., Cedar Park, TX 78613
P.O. Box 80589, Austin, TX 78708-0589
Tel [phone] Fax [phone]

FINLAND

Euroshield OY
Mekaanikontie 1
27510, Eura, Finland
Tel [phone]
Fax [phone]

SINGAPORE

Lindgren RF Enclosures Asia-Pacific
87 Beach Road
#06-02 Chye Sing Building
Singapore 189695
Tel [phone] Fax [phone]

© EMC TEST SYSTEMS, L.P. – SEPTEMBER 2002
REV E – PN 399034

MODEL 3104C BICONICAL ANTENNA

Table of Contents

INTRODUCTION.................................................................................................................................. 1

STANDARD CONFIGURATION......................................................................................................... 2

OPTIONS............................................................................................................................................... 2

ASSEMBLY INSTRUCTIONS..............................................................................................................4

MOUNTING INSTRUCTIONS............................................................................................................. 5

OPERATION......................................................................................................................................... 5

TYPICAL DATA....................................................................................................................................6

SPECIFICATIONS.............................................................................................................................. 10

ELECTRICAL ....................................................................................................................................... 10

PHYSICAL ........................................................................................................................................... 10

MAINTENANCE................................................................................................................................. 11

WARRANTY........................................................................................................................................ 12

© EMC TEST SYSTEMS, L.P. – SEPTEMBER 2002
REV E – PN 399034

MODEL 3104C BICONICAL ANTENNA

© EMC TEST SYSTEMS, L.P. – SEPTEMBER 2002
REV E – PN 399034

MODEL 3104C BICONICAL ANTENNA Introduction

INTRODUCTION

The ETS-Lindgren Model 3104C Biconical Antenna is designed to
operate over the 20 to 200 MHz frequency range to meet Military
and DOD EMI specifications. It is of lightweight construction for
ease in handling and storage.

The biconical elements are made from welded aluminum. The
elements mount in a balun network which is fabricated of phenolic
and is equipped with the necessary impedance-matching
components.

The Model 3104C is designed and precisely manufactured to
conform to the requirements of MIL-STD-461 and other Military
Standards as reflected in Drawing ES-F-201286. Each antenna is
individually calibrated during the manufacturing process. The
results of these calibrations are tabulated and included with the
antenna as gain and antenna factor vs. frequency data for use in
specification compliance testing.

© EMC TEST SYSTEMS, L.P. – SEPTEMBER 2002 1
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Standard Configuration MODEL 3104C BICONICAL ANTENNA

STANDARD CONFIGURATION

• Antenna Elements

• Balun

• Clamp Block

• Individually calibrated at 1 m per SAE ARP 958 and 3 and

10m per ANSI C63.5. Actual factors and a signed Certificate
of Calibration Conformance included.

OPTIONS

Portable Elements (P): Collapsible folding elements are
available, making the antennas portable and ideal for field use.
Both the standard rigid and optional folding elements attach to the
balun using screw mounts. This makes interchanging between the
elements very quick and easy. Optional carrying cases are
available to further enhance portability.

Extended Portable Elements (XP): An extended version of the
portable elements is available. These folding elements are twice as
long as the standard elements. The longer elements enable you to
generate high fields at low frequencies with reduced applied
power.

Carrying Cases: Carrying cases for portable elements and
biconical antenna are readily available.

Support Rod: Antenna mount with insert designed to accept
ETS-Lindgren or other tripod with ¼” x 20 threads

Tripods: ETS-Lindgren offers two nonmetallic, non-reflective
tripods for use at both indoor and outdoor EMC test sites.

The Model 4-TR, constructed of linen phenolic and delrin, is
designed with an adjustable center post for precise height
adjustments. Maximum height for the 4-TR is 2.0 m (80.0 in),
while 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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MODEL 3104C BICONICAL ANTENNA Options

The 7-TR tripod has several different configurations, including
options for manual or pneumatic polarization. This tripod provides
increased stability for physically large antennas. Its unique design
allows for quick assembly/disassembly and convenient storage.
Quick height adjustment and locking wheels provide ease of use
during testing. This tripod can support up to a 13.5 kg (30.0 lb)
load. For the 7-TR series, maximum height is 2.17 m (85.8 in),
with a minimum height of 0.8 m (31.8 in). The 7-TR is constructed
of PVC and fiberglass components.

© EMC TEST SYSTEMS, L.P. – SEPTEMBER 2002 3
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Assembly Instructions MODEL 3104C BICONICAL ANTENNA

ASSEMBLY INSTRUCTIONS

The Model 3104C consists of the following (shipped
unassembled):
1 ea. Balun
2 ea. Biconical Elements
2 ea. Bellville Washers (In a small plastic bag)
1 ea. Mounting Clamp

Step 1. After carefully unpacking all of the components, take one
of the Bellville washers and slide it onto the threaded screw end of
one of the biconical elements.

Step2. Line up the screw threads with the receptacle hole on the
balun and turn the biconical element until it is firmly secured in the
balun. Be careful not to cross-thread this connection or permanent
damage to the joint could occur.

Step 3. Repeat steps 1 and 2 with the other washer and biconical
element. Now you are ready to mount the antenna on a tripod for
testing.

Belleville Washer

Biconical Element

Output Connector

Balun

Clamp (Open Position)

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MODEL 3104C BICONICAL ANTENNA Mounting Instructions

MOUNTING INSTRUCTIONS

The mounting clamp of the Model 3104C uses standard 7/8x14
threads and comes with a 1/4x20 thread adapter for versatility
when mounting on an ETS-Lindgren tripod or most other tripods
for support.

After the mounting clamp is attached to a tripod, unscrew the latch
and open the clamp. Insert the balun of the Model 3104C into the
clamp and close the top over the balun. Move the screw latch to the
closed position and tighten, so the balun is held securely. The cable
can now be attached to the output connector.

OPERATION

The Model 3104C biconical antenna has a traditional coaxial
wound balun which provides a broad frequency range and
moderate gain for both transmitting and receiving. This antenna
may be used for radiated immunity measurements provided that
the peak input power is limited to no more than 100 W.

For enhanced measurement repeatability it is recommended that
when the Model 3104C is used vertically the same element
orientation be maintained from measurement to measurement. A
white strip or dimples on the element block mark the coax shield
side of the element. Keeping this side towards ground when the
antenna is used vertically will increase test repeatability especially
when the Model 3104C is used inside a shielded enclosure.

© EMC TEST SYSTEMS, L.P. – SEPTEMBER 2002 5
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Typical Data MODEL 3104C BICONICAL ANTENNA

TYPICAL DATA

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MODEL 3104C BICONICAL ANTENNA Typical Data

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Typical Data MODEL 3104C BICONICAL ANTENNA

8 © EMC TEST SYSTEMS, L.P. – SEPTEMBER 2002

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MODEL 3104C BICONICAL ANTENNA Typical Data

© EMC TEST SYSTEMS, L.P. – SEPTEMBER 2002 9
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Specifications MODEL 3104C BICONICAL ANTENNA

SPECIFICATIONS

ELECTRICAL

Frequency Range 20-200 MHz
Impedance Matched to 50 ohms
VSWR Ratio (AVG) 2.8:1
Power Input Capability 50 Watts continuous power

100 Watts short term peak
power

Connector Type N

PHYSICAL

Length 143.5 cm (56.5 inches)
Diameter 53.3 cm (21 inches)
Depth 81.3 cm (32 inches)
Weight 2.7 kg (6.0 lbs)

10 © EMC TEST SYSTEMS, L.P. – SEPTEMBER 2002

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MODEL 3104C BICONICAL ANTENNA Maintenance

MAINTENANCE

To ensure reliable and repeatable long-term performance, annual
recalibration of your antennas by ETS-Lindgren’s experienced
technicians is recommended. Our staff can recalibrate almost any
type or brand of antenna. Please call to receive a service order
number prior to sending an antenna to us for calibration.

For more information about our calibration services or to place an
order for antenna calibration visit our calibration website at
http://www.antennacalibration.com/.

© EMC TEST SYSTEMS, L.P. – SEPTEMBER 2002 11
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Warranty MODEL 3104C BICONICAL ANTENNA

WARRANTY

EMC Test Systems, L.P., hereinafter referred to as the Seller, warrants that standard EMCO
products are free from defect in materials and workmanship for a period of two (2) years from
date of shipment. Standard EMCO Products include the following:

v Antennas, Loops, Horns
v GTEM cells, TEM cells, Helmholtz Coils
v LISNs, PLISNs, Rejection cavities & Networks
v Towers, Turntables, Tripods & Controllers
v Field Probes, Current Probes, Injection Probes

If the Buyer notifies the Seller of a defect within the warranty period, the Seller will, at the Seller’s
option, either repair and/or replace those products that prove to be defective.

There will be no charge for warranty services performed at the location the Seller designates.
The Buyer must, however, prepay inbound shipping costs and any duties or taxes. The Seller will
pay outbound shipping cost for a carrier of the Seller’s choice, exclusive of any duties or taxes. If
the Seller determines that warranty service can only be performed at the Buyer’s location, the
Buyer will not be charged for the Seller’s travel related costs.

This warranty does not apply to:

v Normal wear and tear of materials
v Consumable items such as fuses, batteries, etc.
v Products that have been improperly installed, maintained or used
v Products which have been operated outside the specifications
v Products which have been modified without authorization
v Calibration of products, unless necessitated by defects

THIS WARRANTY IS EXCLUSIVE. NO OTHER WARRANTY, WRITTEN OR ORAL, IS
EXPRESSED OR IMPLIED, INCLUDING BUT NOT LMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE REMEDIES
PROVIDED BY THIS WARRANTY ARE THE BUYER’S SOLE AND EXCLUSIVE REMEDIES.
IN NO EVENT IS THE SELLER LIABLE FOR ANY DAMAGES WHATSOEVER, INCLUDING
BUT NOT LIMITED TO, DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

Note: Please contact the Seller’s sales department for a Return Materials Authorization (RMA)
number before shipping equipment to us.

12 © EMC TEST SYSTEMS, L.P. – SEPTEMBER 2002

REV E – PN 399034