Brand : Willtek
Manufacturer Ref. : 4921
Order Ref. : 248346
Weight : 5.9 kg
Willtek 4921 RF Shield |
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New Shield Box Meets High Volume Testing of Service Centres and Manufacturers |
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Willtek’s 4921 RF Shield is a new RF
shielding solution for testing 3G mobile phones, as well as data cards
and WLAN equipment in large service centres and production lines. The
4921 is the optimum solution for service centres and manufacturers with
high volume phone testing because it can endure the high open/close
rates involved. The RF Shield box is designed to eliminate interference
from any adjacent mobile phones, the local base station, and to isolate
the environment from the RF emitted from the phone (or other device
under test).
Stringent Shielding Requirements for 3G Mobile Phone Testing
Most
third-generation (3G) mobile phone systems are based on CDMA
technology, which puts new demands on test environments. The 4921
easily fulfils the 80 dB attenuation requirement for testing mobile
phones for UMTS and other third-generation wireless networks. The RF
absorption inside the 4921 leads to low reflection within the box,
thereby providing high-precision, stable RF measurement results with
instruments connected to it. The 4921 is the first of its kind to meet
all the service, repair and manufacturing requirements in terms of
attenuation, longevity, dimensions, and price |
Easy-to-Use Solution for High-Volume Testing
Most third-generation (3G) mobile phone systems are
based on CDMA technology, which puts new demands on test environments
compared to TDMA systems. Measurements in CDMA systems require 80 dB of
shielding because the mobile will attempt to lock onto the strongest
base station. Without the RF Shield, the mobile would ignore the test
signal and try to lock onto a local network.
In a CDMA system, for example WCDMA (UMTS), one of the
worst-case shielding requirements arises when one mobile is in a max
power test, and the other mobile is in a minimum power test. In this
situation, one mobile is transmitting at +33 dBm, while the other is
attempting to transmit -50 dBm. To properly isolate the two mobiles
from each other, test stations will require at least 80 dB of isolation
between them.
In addition, a receiver test close to the sensitivity
level of the mobile receiver could severely affect test results.
Testing the receiver via the antenna requires the phone to be isolated
from a real base station by 80 dB. Without shielding, the mobile could
receive the signal from a close-by network transmitter at –25 dBm while
trying to detect a test signal at –104 dBm.
For service centres and manufacturing operations, the
Willtek 4921 is the optimum solution because of its reliability,
longevity and support in measurement precision. This has been verified
through a series of endurance tests, and in line with military standard
VG 95737, Electromagnetic Compatibility of Equipment – Part 15 Test
Methods for Coupling and Shielding.
The 4921 is an easy-to-use solution with a solid rocker
arm lever and gas springs that allow the operator to smoothly open and
close the box without using much force. A removable plate on the rear
can be used to hold customer-specific connectors (such as an interface
for remote-controlling the unit under test). The 4921 is designed to
contain the phone under test and possibly an antenna coupler, and
provides a connector for external test equipment (such as the Willtek
4400 Mobile Phone Tester). Highlights:
- Exceeds 80 dB attenuation requirement for RF shielding
- Reliable, robust design, yet small size and weight make it a portable solution
- Ideal for high-volume testing; guaranteed number of open/close cycles
- Suitable for mobile phones of all sizes; approved by leading phone manufacturers
- Modular conception - A whole concept of shielding and coupling with the Willtek 4916 Antenna Coupler
- Bluetooth option for Go/NoGo testing available
The Willtek 4921 RF Shield solves three problems that occur without proper shielding:
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It eliminates problems with adjacent mobiles (radiation from one mobile phone affecting measurements on the other).
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It
eliminates problems with local base stations (signals from a real base
station that affect the measurement, or signals from the phone
affecting calls on a real base station).
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It protects the environment from the RF emitted by the device under test.
Specifications
Specifications
valid within a period of one year after delivery and a maximum of
30,000 open-close cycles; initial isolation significantly exceeds the
values specified.
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Mechanical specifications |
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Connector |
N-type |
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Open-close cycles |
> 50,000 times |
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Dimensions (L x W x H)
Inside:
Outside: |
340 x 240 (190 ) x 160 mm
410 x 265 x 220 mm
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Weight |
4.8 kg (10.5 lbs) |
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RF isolation
Measured according to German military standard VG 95737,
“Electromagnetic Compatibility of Equipment – Part 15 Test Methods for
Coupling and Shielding”, using a shielded RF cable (100 dB isolation) |
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700 to 1000 MHz |
> 90 dB |
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1700 to 2000 MHz |
> 90 dB |
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2000 to 2500 MHz |
> 85 dB |
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5000 to 6000 MHz |
> 80 dB |
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