Asus WL-500b Specifikace stáhnout pdf (Strana 39)

Test Report ------------------------------------------------------------------------------ 29/47

Report No.: A5415648, FCC Part 15

Training Research Co., Ltd., TEL: 886-2-26935155, Fax: 886-2-26934440

VIII. Section 15.247 (C): Spurious Emissions (Radiated)

8.1 Test Condition & Setup

We’ d performed the test by the radiated emission skill: The EUT was placed in an anechoic

chamber, and set the EUT transmitting continuously and scanned at 3-meter distance to determine its

emission characteristics. The physical arrangement of the EUT was varied (within the scope of

arrangements likely to be encountered in actual use) to determine the effect on the unit's emanations in

amplitude, directivity, and frequency. The exact system configuration, which produced the highest

emissions was noted so it could be reproduced later during the final tests. For the measurement above

1GHz, according to the guidance we’ d set the spectrum analyzer’ s 6dB bandwidth RBW to 1MHz.

This was done to ensure that the final measurements would demonstrate the worst-case

interference potential of the EUT.

Final radiation measurements were made on a three-meter, anechoic chamber. The EUT

system was placed on a nonconductive turntable, which is 0.8 meters height, top surface 1.0 x 1.5

meter.

The spectrum was examined from 30 MHz to 1000 MHz using an Hewlett Packard 85460A

EMI Receiver, M.E. whole range Bi-log antenna (Model No.: VULB9160) is used to measure

frequency from 30 MHz to 1GHz. The final test is used the HP 85460A spectrum and 8564E spectrum

was examined from 1GHz to 25GHz using an Hewlett Packard Spectrum Analyzer, EMCO/CMT

Horn Antenna (Model 3115 / RA42-K-F-4B-C) for 1G - 25GHz.

At each frequency, the EUT was rotated 360 degrees, and the antenna was raised and lowered

from one to four meters to find the maximum emission levels. Measurements were taken using both

horizontal and vertical antenna polarization.

Appropriate preamplifiers were used for improving sensitivity and precautions were taken to

avoid overloading or desensitizing the spectrum analyzer. There are two spectrum analyzers use on this

testing, HP 85460A for frequency 30MHz to 1000MHz, and 8564E for frequency 1GHz to 25GHz. No

post-detector video filters were used in the test. The spectrum analyzer's 6dB bandwidth was set to

120KHz (spectrum was examined from 30 MHz to 1000 MHz), the spectrum analyzer's 6 dB

bandwidth was set to 1 MHz (spectrum was examined from 1GHz to 25GHz) and the analyzer was

operated in the maximum hold mode. There is a test condition applies in this test item, the test

procedure description as the following:

Three channels were tested, one in the top (CH01), one in the middle (CH06) and the other in

bottom (CH11). The setting up procedure is recorded on <1.3>

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Asus WL-500b Specifikace Strana 39