Gemtek WL-211F Manual page 72

FCC PART 15, SUBPART C, SEC. 15.247 - DIRECT SEQUENCE SPREAD SPECTRUM TRANSMITTERS
PCMCIA Wireless LAN Card, Model WL-211F
For frequencies above 1 GHz:
- Resolution BW: 1 MHz
- Video BW:
- Detector Mode: Positive Peak
- Averaging:
- Span:
- Amplitude:
- Sweep Time:
•
The frequencies of emissions was first detected. Then the amplitude of the emissions was measured at the specified
measurement distance using required antenna height, polarization, and detector characteristics.
•
During this process, cables and peripheral devices were manipulated within the range of likely configuration.
•
For each mode of operation required to be tested, the frequency spectrum was monitored. Variations in antenna
heights (from 1 meter to 4 meters above the ground plane), antenna polarization (horizontal plane and vertical plane),
cable placement and peripheral placement were explored to produce the highest amplitude signal relative to the limit.
The maximum radiated emission for a given mode of operation was found by using the following step-by-step
procedure:
Step1: Monitor the frequency range of interest at a fixed antenna height and EUT azimuth.
Step2: Manipulate the system cables to produce highest amplitude signal relative to the limit. Note the amplitude
and frequency of the suspect signal.
Step3: Rotate the EUT 360 degrees to maximize the suspected highest amplitude signal. If the signal or another at
a different frequency is observed to exceed the previously noted highest amplitude signal by 1 dB or more,
go back to the azimuth and repeat Step 2. Otherwise, orient the EUT azimuth to repeat the highest amplitude
observation and proceed.
Step4: Move the antenna over its full allowable range of travel (1 to 4 meters) to maximize the suspected highest
amplitude signal. If the signal or another at a different frequency is observed to exceed the previously noted
highest amplitude signal by 1 dB or more, return to Step 2 with the highest amplitude observation and
proceed.
Step5: Change the polarization of the antenna and repeat Step 2 through 4. Compare the resulting suspected highest
amplitude signal with that found for the other polarization. Select and note the higher of the two signals.
This signal is termed the highest observed signal with respect to the limit for this EUT operational mode.
Step6: The effects of various modes of operation is examined. This is done by varying the equipment modes as
steps 2 through 5 are being performed.
Step7: After completing steps 1 through 6, record the final highest emission level, frequency, antenna polarization
and detector mode of the measuring instrument.
ULTRATECH GROUP OF LABS
3000 Bristol Circle, Oakville, Ontario, Canada L6H 6G4
Tel. #: 905-829-1570, Fax. #: 905-829-8050, Email: vhk.ultratech@sympatico.ca, Website: http://www.ultratech-labs.com
•
Assessed by ITI (UK) Competent Body, NVLAP (USA) Accreditation Body & ACA/AUSTEL (Australia)
•
Accredited by Industry Canada (Canada) under ACC-LAB (Europe/Canada MRA)
•
Recognized/Listed by FCC (USA )
•
All test results contained in this engineering test report are traceable to National Institute of Standards and Technology (NIST)
same or greater
Off
500 MHz
Adjust for middle of the instrument's range
Auto
Page 70
FCC ID: MXF-WL211F
File #: GTT-013FTX
March 17, 2000