EMCO 3303 Data Sheet

Model 3303

Rod Antenna

(Model 3305 E-Field Shielding Effectiveness Test Kit)

MANUAL

© EMC TEST SYSTEMS, L.P. – OCTOBER 2002 REV B– PN 399047

MODEL 3303 ROD 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
Mekaanikontie1
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. – OCTOBER 2002
REV B – PN 399047

MODEL 3303 ROD ANTENNA

Table of Contents

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

MODEL 3305 ANTENNA SET .................................................................................................................. 1

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

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

ASSEMBLY AND MOUNTING............................................................................................................ 3

OPERATION......................................................................................................................................... 3

TYPICAL DATA....................................................................................................................................4

MODEL 3305 SYSTEM SETUP............................................................................................................ 5

SUGGESTED TEST PROCEDURE FOR MEASURING ELECTRONIC FIELD SHIELDING EFFECTIVENESS............. 5

SPECIFICATIONS................................................................................................................................ 9

ELECTRICAL ......................................................................................................................................... 9

PHYSICAL ............................................................................................................................................. 9

MAINTENANCE................................................................................................................................. 10

WARRANTY........................................................................................................................................ 11

© EMC TEST SYSTEMS, L.P. – OCTOBER 2002
REV B – PN 399047

MODEL 3303 ROD ANTENNA

© EMC TEST SYSTEMS, L.P. – OCTOBER 2002
REV B – PN 399047

MODEL 3303 ROD ANTENNA Introduction

INTRODUCTION

The Model 3303 Rod Antenna is a passive broadband electric field
monopole transmitting antenna that has a frequency range of 1 kHz
to 30 MHz. It features manual band switching between 0.001-5
MHz and 5-30 MHz. Maximum power handled by Model 3303 is 1
kW.

The base of this antenna is constructed of aluminum, providing
both strength and portability. This housing contains the band
switching mechanism and a female type N connector. There is a
¼”-20 threaded receptacle in the base of the antenna that is
compatible with ETS-Lindgren tripods as well as most others.

The Model 3303 stainless steel receiving element is adjustable
from 50.8 cm (20.0 in) to 104 cm (41 in). For normal testing
purposes it is extended to 104 cm (41 in).

The Model 3303 may also be used as a passive receive antenna.

MODEL 3305 ANTENNA SET

Models 3301B and 3303 are sold separately, or as a set listed as
Model 3305. Together these antennas are specifically designed to
measure shielding effectiveness per IEEE-299, MIL-STD-285 and
NSA 65-6. The set operates from 1 kHz to 30 MHz. Maximum
power required to measure the attenuation required by NSA 65-6 is
80 watts.

Additional information about the Model 3301B can be found in the
Model 3301B operation manual.

© EMC TEST SYSTEMS, L.P. – OCTOBER 2002 1
REV B – PN 399047

Standard Configuration MODEL 3303 ROD ANTENNA

STANDARD CONFIGURATION

• Adjustable monopole element

• Model 3003 antenna base has a built-in manual band switch

and Type N connector

• Counterpoise (60 cm)

• Base configured to accept ETS-Lindgren or other tripod

mounts with standard ¼”-20 threads

• Individually calibrated per (ESCM) or IEEE Std. 291 using

NIST traceable equipment. By knowing the actually antenna
factors and performance characteristics of an antenna instead
of typical data, you can more accurately calculate the field
strength in your tests. Actual individual calibration factors and
signed Certificate of Calibration Conformance are included

OPTIONS

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 piece 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 bear up
to an 11.8 kg (26.0 lb) load.

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 bear 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 .8m (31.8 in). The 7-TR is constructed of PVC
and fiberglass components.

2 © EMC TEST SYSTEMS, L.P. – OCTOBER 2002

REV B – PN 399047

MODEL 3303 ROD ANTENNA Assembly and Mounting

ASSEMBLY AND MOUNTING

IMPORTANT: During the assembly and mounting of this unit
take care not to cross thread any connections as permanent damage
to the antenna could result.

To assemble the Model 3303 antenna, thread the stainless steel rod
into the receptacle at the top of the base unit.

To mount the Model 3303 antenna on a tripod, thread a ¼”-20
threaded tripod mount into the receptacle hole on the bottom of the
base unit.

The Model 3303 is meant to be under the counterpoise. The
antenna housing hangs under the counterpoise with the antenna rod
passing through an opening in the counterpoise. Attach the
provided counterpoise by unfolding it and placing it on the antenna
housing. The counterpoise should be connected to the antenna
using the four screws at the top of the antenna housing. By
mounting the counterpoise between the housing and the rod
antenna, the body of the antenna does not intrude into the field
being measured. Next, the rod element should be attached to the
fitting at the center of the unit, through the hole in the
counterpoise. The rod should then be extended to 41 inches.

If the unit is to be mounted on a tripod, it is recommended that the
tripod be non-conductive.

OPERATION

CAUTION: Be sure to reduce amplifier power to zero watts before
band switching the 3303.

Select the frequency band desired by rotating the band switch on
the 3303 transmitting antenna.

© EMC TEST SYSTEMS, L.P. – OCTOBER 2002 3
REV B – PN 399047

Typical Data MODEL 3303 ROD ANTENNA

TYPICAL DATA

4 © EMC TEST SYSTEMS, L.P. – OCTOBER 2002

REV B – PN 399047

MODEL 3303 ROD ANTENNA Model 3305 System Setup

MODEL 3305 SYSTEM SETUP

SUGGESTED TEST PROCEDURE FOR
MEASURING ELECTRONIC FIELD
SHIELDING EFFECTIVENESS

Set the transmitting and receiving antennas, 24 inches + thickness
of screen room wall, apart from each other. Set up equipment as
shown in Figure 1. Turn generator to “ON” position. Disable RF
output of generator. Turn amplifier to “ON” position. Turn
receiver to “ON” position. Turn Model 3301B receiver rod power
“ON” (verify green light is “ON”). Set receiver. Set the attenuator
at maximum (100-150 dB) attenuation. Enable RF output of the
generator.

Adjust signal amplitude on signal generator to maximum allowed
by amplifier Input. Establish a reference level by decreasing the
attenuation level until the signal can be detected by the receiver.
Note the attenuator setting. Relocate antennas with screen room
wall between them. Reduce attenuation further until signal is again
seen at the same level as without shielding. The difference in the
two attenuator settings is the shielding effectiveness. If the signal
cannot be seen with a zero setting; then the shielding effectiveness
is greater than the attenuation range or the power amplifier does
not have enough power. Refer to Figure 1 for Test Set-up. Table 1
shows the maximum shielding effectiveness measuring capability
of the 3305 Rod Set and the approximate wattage required for the
Transmitting Rod 3303 to meet the minimum shielding
requirements of NSA 65-6.

NOTE: These shielding effectiveness readings are valid only if the
power amplifier is operating in the linear region. This can be
verified by reducing (or increasing) attenuation and observing the
receiver signal on the analyzer or receiver. If the receiving signal
also decreases (or increases) by the same amount then the amplifier
is operating in the linear region.

© EMC TEST SYSTEMS, L.P. – OCTOBER 2002 5
REV B – PN 399047

Model 3305 System Setup MODEL 3303 ROD ANTENNA

CAUTION: Be sure to reduce amplifier power to near zero watts
before band switching the 3303.

Reference: NSA 65-6
MIL-STD-285

6 © EMC TEST SYSTEMS, L.P. – OCTOBER 2002

REV B – PN 399047

MODEL 3303 ROD ANTENNA Model 3305 System Setup

ELECTRIC SHIELDING EFFECTIVENESS TESTING

RECEIVER

H/P 8566B OR

EQUIVALENT

MODEL 3301B

RECEIVE

24 INCHES + T

T= THICKNESS OF MA TERIAL

TO BE TESTED

TRANSMIT

MODEL 3303

WA TTMETER

BIRD MODEL 43

OR EQUIVALENT

120 dB

ATTENUATOR

H/P 8494, 8496

OR EQUIVALENT

SIGNAL GENERATOR

H/P 8116A OR

EQUIVALENT

FIGURE 1. SUGGESTED TEST SET-UP FOR

POWER AMPLIFIER

ENI 1040L, A300 OR

EQUIVALENT

55 dB GAIN

© EMC TEST SYSTEMS, L.P. – OCTOBER 2002 7
REV B – PN 399047

Model 3305 System Setup MODEL 3303 ROD ANTENNA

Table 1. Electric Field Shielding Effectiveness Measurement

Frequency NSA 65-6

Minimum
Attenuation for
Electric Field

Approximate
Wattage Required
to meet NSA 65-6
attenuation
specifications

Maximum
Shielding
(Electric Field)
that can be
measured with

this set up
Band 1
1 kHz 70 dB 80 Watts 100 dB
10 100 80 120
20 100 80 115
30 100 70 110
40 100 75 112
50 100 40 110
60 100 35 110
70 100 40 110
80 100 25 110
90 100 30 110
100 100 30 110
200 100 25 117
300 100 25 120
400 100 25 125
500 100 25 125
600 100 30 125
700 100 30 125
800 100 30 125
900 kHz 100 30 125
1 MHz 100 30 125
2 100 30 125
4 100 30 125
5 100 30 125
Band 2
5 100 25 125
6 100 25 125
8 100 25 125
10 100 20 125
15 100 25 125
20 100 20 125
25 100 45 125
30 100 25 125

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

REV B – PN 399047

MODEL 3303 ROD ANTENNA Specifications

SPECIFICATIONS

ELECTRICAL

Frequency 1 kHz – 30 MHz
Maximum Continuous Power 300 W
Peak Power 1 kW
Impedance (nominal) Varies with frequency1
Connector Type N female

PHYSICAL

Base Width 7.6 cm (3.0 in)
Base Depth 7.6 cm (3.0 in)
Base Height 15.2 cm (6.0 in)
Rod Height 50.8 – 104.0 cm (20.0 – 41.0 in)
Weight 1.3 kg (2.8 lb)

1

Calibrated in a 50 ohm system.

© EMC TEST SYSTEMS, L.P. – OCTOBER 2002 9
REV B – PN 399047

Maintenance MODEL 3303 ROD ANTENNA

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/.

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

REV B – PN 399047

MODEL 3303 ROD ANTENNA Warranty

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.

© EMC TEST SYSTEMS, L.P. – OCTOBER 2002 11
REV B – PN 399047