WILLTEK 4921 RF Shield User manual

4921 RF Shield
User’s Guide
boosting wireless efficiency
User’s guide
Version 1.00

4921 RF Shield 1.00 i
Notice Every effort was made to ensure that the information in this document was
accurate at the time of printing. However, information is subject to change
without notice, and Willtek reserves the right to provide an addendum to this
document with information not available at the time this document was created.
Copyright © Copyright 2006 Willtek Communications GmbH. All rights reserved. Willtek and
its logo are trademarks of Willtek Communications. All other trademarks and
registered trademarks are the property of their respective owners. No part of this
guide may be reproduced or transmitted electronically or otherwise without
written permission of the publisher.
Trademarks Willtek is a trademark of Willtek Communications GmbH in Germany and other
countries.
Ordering information This guide is issued as part of the 4921 RF Shield. The ordering number for a
published guide is M 292 016. The ordering numbers for the product and the RF
Shield Package are as follows:
Table 1 Product ordering information
Ordering number Description
M 248 346 4921 RF Shield (N) (including RF cable N - N)
M 248 348 RF Shield Package
(4921 RF Shield, 4916 Antenna Coupler)

ii 4921 RF Shield 1.00

4921 RF Shield 1.00 iii
Table of Contents
About This Guide v
Purpose and scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
Related information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
Technical assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii
Safety Notes ix
Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .x
Handling instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .x
Chapter 1 Overview 1
About the 4921 RF Shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Features and capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Chapter 2 Operation 5
Connecting the Willtek 4921 RF Shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Installing the 4916 Antenna Coupler in the Willtek 4921 RF Shield . . . . . . . . . . .6
Chapter 3 Maintenance 9
The Shielding Service Kit Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Appendix A Warranty and Repair 11
Warranty information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Equipment return instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table of Contents
iv 4921 RF Shield 1.00
Publication History 15

4921 RF Shield 1.00 v
About This Guide
–“Purpose and scope” on page vi
–“Assumptions” on page vi
–“Related information” on page vi
–“Technical assistance” on page vi
–“Conventions” on page vii

About This Guide
Purpose and scope
vi 4921 RF Shield 1.00
Purpose and scope
The purpose of this guide is to help you successfully use the 4921 RF Shield
features and capabilities. This guide includes task-based instructions that
describe how to handle and use the 4921 RF Shield. Additionally, this guide
provides a description of Willtek’s warranty, services, and repair information,
including terms and conditions of the licensing agreement.
Assumptions
This guide is intended for novice, intermediate, and experienced users who want
to use the 4921 RF Shield effectively and efficiently. We are assuming that you
have basic computer and mouse/track ball experience and are familiar with basic
telecommunication concepts and terminology.
Related information
Use this guide in conjunction with the following information:
4916 Antenna Coupler: user’s guide, M 292 015.
Technical assistance
If you need assistance or have questions related to the use of this product, call
one of Willtek’s technical assistance centers. You can also contact Willtek by
e-mail at customer.sup[email protected].
Table 1 Technical assistance centers
Region Phone number Fax number
Europe, Middle East,
Asia, Africa
[phone] [phone]
Americas [phone] [phone]
China [phone] [phone]

About This Guide
Conventions
4921 RF Shield 1.00 vii
Conventions
This guide uses naming conventions and symbols, as described in the following
tables.
Table 2 Typographical conventions
Description Example
User interface actions appear in this
typeface.
On the Status bar, click Start.
Buttons or switches that you press
on a unit appear in this TYPEFACE.
Press the ONswitch.
Code and output messages appear
in this typeface.
All results okay
Text you must type exactly as
shown appears in this typeface.
Type: a:\set.exe in the dialog
box.
Variables appear in this <typeface>. Type the new <hostname>.
Book references appear in this type-
face.
Refer to Newton’s Telecom Dictio-
nary
A vertical bar | means “or”: only one
option can appear in a single com-
mand.
platform [a|b|e]
Square brackets [ ] indicate an
optional argument.
login [platform name]
Slanted brackets < > group required
arguments.
<password>
Table 3 Keyboard and menu conventions
Description Example
A plus sign + indicates simultaneous
keystrokes.
Press Ctrl+s
A comma indicates consecutive key-
strokes.
Press Alt+f,s
A slanted bracket indicates choos-
ing a submenu from menu.
On the menu bar, click
Start > Program Files.

About This Guide
Conventions
viii 4921 RF Shield 1.00
Table 4 Symbol conventions
This symbol represents a general hazard.
This symbol represents a risk of electrical shock.
NOTE
This symbol represents a note indicating related information or tip.

4921 RF Shield 1.00 ix
Safety Notes
This chapter provides the safety notes for the 4921 RF Shield. Topics discussed in
this chapter include the following:
–“Safety instructions” on page x
–“Handling instructions” on page x

Safety Notes
Safety instructions
x4921 RF Shield 1.00
Safety instructions
In order to ensure safe handling and avoid injuries, adhere to the following safety
instruction.
Handling instructions
In order to avoid damage to the 4921 RF Shield and ensure shielding perfor-
mance, adhere to the following handling instructions.
CAUTION
Close the 4921 RF Shield’s lid carefully. Careless handling of the lid and the
closing mechanisms can result in hand injury.
CAUTION
The exertion of physical impact on the 4921 RF Shield, for example by drop-
ping it, can cause damage and thus have adverse effects on the shielding per-
formance. Be sure to handle the 4921 RF Shield carefully and do not expose it
to physical impact of any kind.
Proper usage
Use the 4921 RF Shield only for its designated purpose.
Do not use it as a carrier box.
Prevent material fatigue
Leave the 4921 RF Shield open when not in use to prevent material fatigue.
Cleaning
The contact surface has to be cleaned at least twice a year, or even more
often depending on usage and contamination. For cleaning and maintenance
the Shielding Service Kit Option is available. Sections “Options” on page 3 and
“The Shielding Service Kit Option” on page 10 offer more details as well as
ordering information. For cleaning instructions please refer to the printed
information that comes with your Shielding Service Kit.
Replacing parts
Contact springs and sealing string have to be replaced after 50,000 open/
close cycles at the latest, or even earlier depending on usage and contamina-
tion. When replacing these parts adhere to the instructions provided with the
Shielding Service Kit.

1
4921 RF Shield 1.00 1
Chapter 1 Overview
This chapter provides a general description of the 4921 RF Shield. Topics
discussed in this chapter include the following:
–“About the 4921 RF Shield” on page 2
–“Features and capabilities” on page 3
–“Options” on page 3

Chapter 1 Overview
About the 4921 RF Shield
24921 RF Shield 1.00
About the 4921 RF Shield
The 4921 RF Shield is an RF shielding solution for testing 3G mobile phones as
well as data cards and WLAN equipment in large service centers and production
lines. It is the optimum solution for service centers and manufacturers with high
volume phone testing because it can endure the high open/close rates involved
and offers reliability, longevity and support in measurement precision.
The 4921 RF Shield is designed to eliminate interference from any adjacent
mobile phones and the local base station, and to isolate the environment from
the RF emitted from the phone (or other device under test). The 4921 can contain
the phone under test as well as an antenna coupler, e.g. the Willtek 4916
Antenna Coupler, and provides a connector for external test equipment (such as
the Willtek 4400 Mobile Phone Tester). With a solid rocker arm lever and gas
springs that allow the operator to smoothly open and close the box without
using much force the 4921 is an easy-to-use solution. A removable plate on the
rear can be used to hold customer-specific connectors, e.g. for an interface for
remote-controlling the unit under test.

Chapter 1 Overview
Features and capabilities
4921 RF Shield 1.00 3
Features and capabilities
More than 80 dB shielding
Highly reliable and robust design, guaranteed number of open-close cycles
Portable (small size and low weight)
Complementing the 4916 Antenna Coupler
Suitable for mobile phones of all sizes
RF isolation measured according to German military standard VG 95737, "Elec-
tromagnetic Compatibility of Equipment - Part 15 Test Methods for Coupling and
Shielding“
Optional rear panel for customer-specific connectors
Options
The following accessories are available:
Table 1 Accessories for the 4921 RF Shield
Order number Description
M 300 850 Rear panel for customization
M 248 349 Shielding Service Kit
(gas springs, finger stocks, RF gasket)
M 382 804 Shielded RF cable (N - N), 1.5 m
(high-performance Sucoflex 104 cable)

Chapter 1 Overview
Options
44921 RF Shield 1.00

2
4921 RF Shield 1.00 5
Chapter 2 Operation
This chapter describes the operation of the 4921 RF Shield. Topics discussed in
this chapter are as follows:
–“Connecting the Willtek 4921 RF Shield” on page 6
–“Installing the 4916 Antenna Coupler in the Willtek 4921 RF Shield” on
page 6

Chapter 2 Operation
Connecting the Willtek 4921 RF Shield
64921 RF Shield 1.00
Connecting the Willtek 4921 RF Shield
The 4921 RF Shield provides a connector for external test equipment, e.g. the
Willtek 4400 Mobile Phone tester series. Via the RF cable that comes with your
4921 RF Shield you can connect it to your measurement instrument.
Customer-specific connectors: An optional removable plate on the rear of the RF
Shield can be used to hold customer-specific connectors. For details on ordering
information refer to “Options” on page 3.
Installing the 4916 Antenna Coupler in the Willtek 4921 RF Shield
The Willtek 4921 RF Shield is equipped to hold the 4916 Antenna Coupler in a
defined position.
To install the 4916 Antenna Coupler in the 4921 RF Shield, proceed as follows:
1Place the 4916 Antenna Coupler in the shield box and push it between the
clamps.
2Move the coupler up and down between the clamps until the coupler is
tightly held and the left-hand clamp has direct contact with the coupler.
Attach the supplied cable from the 4916 Antenna Coupler to the inside of the
box and connect the RF cable. Connect the RF cable to the coupler (this cable is
already attached to the RF Shield).

Chapter 2 Operation
Installing the 4916 Antenna Coupler in the Willtek 4921 RF Shield
4921 RF Shield 1.00 7
NOTE
For precise power and sensitivity measurements the antenna coupling factor
should be taken into account when setting the RF power level at the instru-
ment and when interpreting measurement results. A table of coupling loss
factors (attenuation values) for most mobile phone types is available from
Willtek on the Internet. The attenuation values stated there are only valid for
the defined position of the antenna coupler within the 4921 RF Shield and the
defined shuttle position on the coupler.
For further information please refer to the 4916 Antenna Coupler user’s guide.

Chapter 2 Operation
Installing the 4916 Antenna Coupler in the Willtek 4921 RF Shield
84921 RF Shield 1.00