ETS-Lindgren 3159C Manuale utente

Introduction |1

Model 3159C

High-Power

Biconical Antenna

User Manual

2 | Introduction

Introduction |3

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.

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.

Revision Record

MANUAL,3159C HIGH POWER BI-CONICAL ANT | Part #399775, Rev. E

Revision Description Date

A Initial Release November, 2005

B Rebrand November, 2008

C Update specifications February, 2018

D Update specifications, add

extension information

July, 2020

E Update information on variations SeptemberOctober,

2020

4 | Introduction

Table of Contents

Notes, Cautions, and Warnings ............................................... 5

1.0 Introduction.......................................................................... 6

ETS-Lindgren Product Information Bulletin ...................................................7

2.0 Maintenance ......................................................................... 8

Annual Calibration .........................................................................................8

Replacement Parts ........................................................................................8

Service Procedures .......................................................................................8

3.0 Specifications ...................................................................... 9

Electrical Specifications .................................................................................9

Physical Specifications ..................................................................................9

Model 3159C Antenna ...........................................................................9

Model 3159C Pedestal ..........................................................................9

Ferrite Floor .........................................................................................10

4.0 Mounting Instructions....................................................... 11

Mounting the Balun and Polarization Unit....................................................11

Mounting the Biconical Elements.................................................................12

Adjusting the Tube Extensions ....................................................................12

Removing the Connector .............................................................................13

5.0 Operation............................................................................ 14

Model 3159C Pedestal ................................................................................14

Electrical Field Distribution ..........................................................................14

Performance ................................................................................................15

Typical Calibration Data...............................................................................19

Typical Antenna Factor at 6M..............................................................19

Calculated Forward Power at 3.5M .....................................................19

Balun VSWR........................................................................................20

Introduction |5

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.

6 | Introduction

1.0 Introduction

The ETS-Lindgren Model 3159C High-Power Biconical Antenna is a broadband, linearly polarized biconical antenna

with a 20 MHz to 100 MHz frequency range. This antenna exhibits a wide beamwidth and is designed to continuously

handle up to 10 kW input power for generating high electric field strength over a large uniform area.

The pedestal is assembled with two fixed and two freewheeling casters that allow the antenna position on the test range

to be easily adjusted, or rolled into or out of the chamber for storage when not in use. The dual mast features regularly

spaced mounting holes so that the height of the boom can be adjusted. Slots below the base allow for easy transport with

a pallet jack or forklift. Horizontal and vertical polarization rotation is performed by a toggle switch on the back. The air

valve assembly for pneumatic polarization is mounted on the mast. The base is a steel plate covered in 137 ferrite tiles.

Each tile has a 10 mm hole in its center.

Unlike the top hat, capacitive-loaded, log periodic dipole antenna normally used in this frequency range, the phase

center/source distance is the same for low and high frequencies. This ensures high field strength at frequencies as low as

20 MHz. The design of the Model 3159C takes advantage of the wide beamwidth feature of a biconical antenna. In

addition, the optimized design provides low VSWR and high radiation efficiency.

The 3159 was developed to support high field strength immunity measurements in anechoic chambers of varying sizes.

Versions of this antenna have been used in various sized chambers from those small enough to support the ISO 11452-2

component testing, up to full sized chambers with at least 8 m of clear internal height, large enough to support ISO 11451-

2 vehicle testing.

The BiConical antennas of different sizes are broadband adaptations of a half wave dipole antenna optimized for use in

the 20 MHz to 300 MHz frequency range. Over this range, they are still electrically very short. To overcome this limitation

in radiation efficiency, there are several variants of the 3159 antenna, each designed to optimize the antenna performance

based on the available space and test distance, with the available amplifier power used to estimate the best case

performance.

The standard

configuration for the

Model 3159C consists of:

Two open-end

adjustable biconical

elements

High-power balun

Pedestal with casters

and polarization

control

Two Biconical

elements

(shown with

extensions)

Pneumatically

assisted

polarization

cylinder

Casters

Balun unit

Ferrite floor

Introduction |7

All current variants of the 3159 antenna with different element arrangements feature a 10kW balun. In the current version

C design, the balun is an air-cooled 4:1 Guanella transformer, with upgraded corona and tracking breakdown protection

over previous versions. There are six pairs of removable sections with included sections; the complete set consists of twelve

1.74 m long sections with up to two 0.5 m extensions (per element), which can be used for a maximum element length of

2.74m (Figure 1).

Figure 1: Overall dimensions of 3159C Antenna

The antenna can be assembled and used to its maximum power rating with the twelve 1.74m long elements as a

minimum, and any symmetrical combination of the extensions. The additional 0.5m extensions can help reduce the

VSWR and improve the gain of the antenna at the low frequency end of is operation, but can increase the VSWR at other

frequencies depending on the chamber layout and proximity to other structures. The lower VSWR increases the forward

power that can be delivered to the antenna, which could improve the measured field strength.

The extensions should therefore only be used to fine-tune the performance of the antenna, with the benefit of

measurement data taken in the actual operating chamber with a representative setup.

ETS-Lindgren Product Information Bulletin

See the ETS-Lindgren Product Information Bulletin included with your shipment for the following:

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

8 | Maintenance

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 3159C is limited to external components such as

cables or connectors.

If you have any questions concerning maintenance, contact ETS-Lindgren

Customer Service.

Check all screws periodically and tighten any that are loose.

Check the air filters weekly; more often, as necessary. The air used to feed the cylinder must be free of dirt and

moisture. Never allow the air filters to fill with water.

Lubricate all O-rings and pistons at 18-month intervals to prevent excessive wear. The air cylinder uses a

special O-ring lubricant that can be purchased from any seal or bearing store or from ETS-Lindgren.

Annual Calibration

See the Product Information Bulletin included with your shipment for information on ETS-Lindgren calibration services.

Replacement Parts

ETS-Lindgren may substitute a similar part or new part number with the same functionality for

another part/part number. Contact ETS-Lindgren for questions about part numbers and

ordering parts.

Following are the part numbers for ordering replacement parts for the Model 3159C High-Power Biconical Antenna.

Part Description Part Number

High-Power Biconical Antenna 3159C

Mast 109620

Polarization Unit (on 109620) 1718301

1 5/8 EIA Connector 675283

Element, Tube, Main 118514

Element, Tube, Half Meter Extension 118515

Bolt, M8 x 25, Hex, SS 930732

Washer, M8, Lock, Split, SS 930037

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.

WARRANTY

Specifications |9

3.0 Specifications

Electrical Specifications

Frequency: 20 MHz–100 MHz

Input Impedance: 50 Ω

VSWR: Typical—2:1

Maximum—4:1

Average RF Input Power: 10 kW

Maximum RF Input Power: 15 kW

RF Connector: 1 5/8 in EIA flange

Physical Specifications

MODEL 3159C ANTENNA

Length: 5.4 m (17.7 ft)

Length without extension: 3.6 m (11.8 ft)

Length with one extension: 4.5 m (14.8 ft)

Length with both extensions: 5.4 m (17.7 ft)

Diameter: 2.4 m (7.9 ft)

Weight without extensions: 12.7 kg (28 lbs)

Weight with one extension: 14.06 kg (31 lbs)

Weight with both extensions: 15.42 kg (34 lbs)

MODEL 3159C PEDESTAL

Length: 4.47 m (14.7 ft)

Width: 160 cm (63 in)

Total height with antenna: 6.52 m (21.42 ft)

Weight (without antenna): 272.16 kg (600 lbs)

Air Pressure Required: 80–120 PSI

10 | Specifications

FERRITE FLOOR

Length: 130 cm (51.18 in)

Width: 150.01 cm (59.06 in)

Individual tiles: 100 mm x 100 mm x 6.7 mm

(3.94 in x 3.94 in x 0.26 in)

Weight: 113.40 kg (250 lbs)

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