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FCC PART 15, SUBPART C, SEC. 15.247 - DIRECT SEQUENCE SPREAD SPECTRUM TRANSMITTERS
PCMCIA Wireless LAN Card, Model WL-211F
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Broad-band ac Powerline conducted emissions:- If the EUT exhibits ac Powerline conducted emissions that exceed
the limit with the instrument set to the quasi-peak mode, then measurements should be made in the average mode. If
the amplitude measured in the quasi-peak mode is at least 6 dB higher than the amplitude measured in the average
mode, the level measured in quasi peak mode may be reduced by 13 dB before comparing it to the limit.
8.3.
EFFECTIVE RADIATED POWER
§
The following shall be applied to the combination(s) of the radio device and its intended antenna(e).
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I f the RF level is user adjustable, all measurements shall be made with the highest power level available to the user
for that combination.
§
The following method of measurement shall apply to both conducted and radiated measurements.
§
The radiated measurements are performed at the Ultratech Calibrated Open Field Test Site.
§
The measurement shall be performed using normal operation of the equipment with modulation.
Test procedure shall be as follows:
Step 1: Duty Cycle measurements
Ø
Using a spectrum analyzer with the frequency span set to 0 Hz and the sweep time set at a suitable value to
capture the envelope peaks and the duty cycle of the transmitter output signal;
Ø
The duty cycle of the transmitter, x = Tx on / (Tx on + Tx off) with 0<x<1, is measure and recorded in the test
report. For the purpose of testing, the equipment shall be operated with a duty cycle that is equal or more than
0.1.
Step 2: Calculation of Peak and Average EIRP
Ø
The peak output power of the transmitter shall be determined using a wideband, calibrated RF Peak Power
Meter with the power sensor with an integration period that exceeds the repetition period of the transmitter by a
factor 5 or more. The observed value shall be recorded as "P" (in dBm);
Ø
The Average EIRP. shall be calculated from the above measured power output "A", the observed duty cycle x,
and the applicable antenna assembly gain "G" in dBi, according to the formula:
Peak EIRP = P + G
Average EIRP = Peak EIRP + 10log(1/x)
Figure 1.
Step 3: Substitution Method. See Figure 2
(a)
The measurements was performed in the absence of modulation (un-modulated)
(b)
Test was performed at listed 3m open area test site (listed with FCC, IC, ITI, NVLAP, ACA & VCCI).
(c)
The transmitter under test was placed at the specified height on a non-conducting turntable (80 cm
height)
(d)
The dipole test antenna was used and tuned to the transmitter carrier frequency.
(e)
The spectrum analyzer was tuned to transmitter carrier frequency. The test antenna was lowered or raised
from 1 to 4 meters until the maximum signal level was detected.
(f)
The transmitter was rotated through 360
received.
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
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Assessed by ITI (UK) Competent Body, NVLAP (USA) Accreditation Body & ACA/AUSTEL (Australia)
•
Accredited by Industry Canada (Canada) under ACC-LAB (Europe/Canada MRA)
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Recognized/Listed by FCC (USA )
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All test results contained in this engineering test report are traceable to National Institute of Standards and Technology (NIST)
o
about a vertical axis until a higher maximum signal was
Page 67
FCC ID: MXF-WL211F
File #: GTT-013FTX
March 17, 2000
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