ETS-LINDGREN 3104C Biconical Antenna User Manual

An ESCO Technologies Company
Model 3104C
Biconical Antenna
User Manual

ETS-Lindgren Inc. reserves the right to make changes to any products herein to improve functioning or design. Although the information in this document has been carefully reviewed and is believed to be reliable, ETS-Lindgren does not assume any liability arising out of the application or use of any product or circuit described herein; nor does it convey any license under its patent rights nor the rights of others. All trademarks are the property of their respective owners.

© Copyright 2000–2022 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.; Delrin is a registered trademark of E. I. du Pont de Nemours and Company.

Revision Record | MANUAL 3104C | Part #399034, Rev. G

Revision| Description|

Date

---|---|---
A—D| Initial Release; updates / edits| 2000-2002
E| Updated Specifications| September 2002
F| Updated PX branding; updated Mounting Instructions; rebrand| February 2009
G| Corrected length dimension| March 2022

Notes, Cautions, and Warnings

| Note: Denotes helpful information intended to provide tips for better use of the product.
---|---
CAUTION| Caution: Denotes a hazard. Failure to follow instructions could result in minor personal injury and/or property damage. The included text gives proper procedures.
WARNING| Warning: Denotes a hazard. Failure to follow instructions could result in SEVERE personal injury and/or property damage. The included text gives proper procedures.

See the ETS-Lindgren Product Information Bulletin for safety, regulatory, and other product marking information.

Introduction

The ETS-Lindgren Model 3104C Biconical Antenna is designed to operate over the 20 MHz to 200 MHz frequency range to meet Military and Department of Defense EMI specifications. The Model 3104C is designed and precisely manufactured to conform to the requirements of MIL-S TD-461 and other Military Standards as reflected in Drawing ES-F-201286.

The biconical elements are made from welded aluminum. The elements mount in a balun network fabricated of phenolic and equipped with the necessary impedance-matc hi ng compone us. The lightweight construction provides easy handling and storage.
Each antenna is individually calibrated during the manufacturing process. The results of these calibrations are included for use in specification compliance testing.

Optional Items
PORTABLE ELEMENTS (MODEL 3104CP)
Collapsible folding elements are available, making the Model 3104C portable and ideal for field use. Both the standard rigid and optional folding elements attach to the balun usi ng screw mounts. This makes changing between the two types of elements quick and easy.

EXTENDED PORTABLE ELEMENTS (MODEL 3104CPX)
An extended version of the portable element is available. These folding elements are twice as long as the standard elements. The longer elements enable you togenerate high fields at low frequencies with reduced applied power.

CARRYING CASES
Carrying cases for biconical antennas and portable elements are available.

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. The maximum height is 2.0 m (80.0 in), and the minimum height is 94 cm (37.0 in). This tripod can support up to an 11.8 kg (26.0 lb) load.
  

• 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. The 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 s hipme not for the following:

• Safety, regulatory, and other product marking information
• Steps to receiving your shipment
• Steps to re-turn a component for se service
• ETS-Lindgren calibration service
• ETS-Lindgren contact information

Maintenance

  CAUTION Before performing any maintenance, follow the safety information in the ETS-Lindgren Product Information Bulletin included with your shipment.
Maintenance of the Model 3104C 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 E TS-Lindgren calibration services.

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.

Specifications

Electrical Specifications

· 100 Watts short-term peak power
Connector| Type N

Physical Specifications

Assembly Instructions

CAUTION Before connecting any components, follow the safety information in the ETS-Lindgren Product Information Bulletin included with your shipment.

The Model 3104C Biconical Antenna is shipped unassembled and includes these parts:

• Balun
• Biconical element (2)
• Belleville washer (2)
• 100733 Support Rod
• 101942B Support Base
• 102108 Clamp Block

To assemble the Model 3104C:

1. Slide a Belleville washer onto the threaded screw end of one of the biconical elements.

2. 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.
   CAUTION: Do not cross-thread this connection or permanent damage to the joint could occur.

3. Repeat steps 1 and steps 2 using the remaining washer and biconical element.

Mounting Instructions

CAUTION: Before connecting any components, follow the safety information in the ETS-Lindgren Product Information Bulletin included with your shipment.

Using Included Mounting Adapters on a 4-TR
The Model 3104C s hips with the following adapters are used to mount the antenna to a 4-TR tripod:

• 102108 Clamp Block—Uses standard 7/8–14 threads and comes with a 1/4–20 thread adapter for mounting to an ETS-Lindgren tripod or most other tripods.
• 100733 Support Rod
• 101942B Support Base

To use these adapters to mount the Model 3104C to a 4-TR tripod:

1. Assemble the clamp block, support base, and support rod.
2. Attach the support base to the 4-TR tripod.
3. Unscrew the clamp block latch and open the top.
4. Inse rt the shaft of the balun into the clamp block and close the top.
5. Move the latch to the closed position and tighten it so the antenna is held securely.
6. Attach the cable to the output connector on the antenna.

Additional Mounting Options

4-TR MOUNTING OPTIONS
Following are additional options for mounting the Model 3104C onto an ETS- Lindgren 4-TR Tripod. Contact the ETS-Lindgren Sales Department for information on ordering optional mounting hardware.

7-TR AND MAST MOUNTING OPTIONS
Following are options for mounting the Model 3104C onto an ETS-Lindgre n 7 -TR Tripod or mast.
Contact the ETS-Lindgren Sales Department for information on ordering optional mounting hardware.

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
  

2X2 BOOM MOUNTING OPTIONS
Following are additional options for mounting the Model 3104C onto a 2×2 boom.
Contact the ETS-Lindgren Sales Department for information on ordering optional mounting hardware.
2×2 boom refers to a typical 2-i nc h b y 2 -inch boom.

Operation

The Model 3104C Biconical Antenna has a traditional coaxial wound balun that 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. Keep this side towards the ground when the antenna is used vertically to increase test repeatability, especially when the
Model 3104C is used inside a shielded enclosure.

Typical Data

Model 3104C Antenna Factor

Model 3104C Gain

Model 3104C VSWR

Model 3104C Half-Power Beamwidth

Model 3104C Forward Power
@ 1 M–DERIVED FROM AF

@ 3 M–DERIVED FROM AF

@ 3M–MEASURED OVER CONDUCTING GROUND

Documents / Resources

| ETS- LINDGREN 3104C Biconical Antenna [pdf] User Manual
3104C, Biconical Antenna, 3104C Biconical Antenna
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