Radiated Emission Measurement Uncertainty - Gemtek WL-211F Manual

FCC PART 15, SUBPART C, SEC. 15.247 - DIRECT SEQUENCE SPREAD SPECTRUM TRANSMITTERS
PCMCIA Wireless LAN Card, Model WL-211F
7.2.

RADIATED EMISSION MEASUREMENT UNCERTAINTY

CONTRIBUTION
(Radiated Emissions)
Antenna Factor Calibration
Cable Loss Calibration
EMI Receiver specification
Antenna Directivit
Antenna factor variation with height
Antenna phase center variation
Antenna factor frequency interpolation
Measurement distance variation
Site imperfections
Mismatch: Receiver VRC
Antenna VRC
Uncertainty limits 20Log(1+
System repeatability
Repeatability of EUT
Combined standard uncertainty
Expanded uncertainty U
Calculation for maximum uncertainty when 3m biconical antenna including a factor of k=2 is used:
U = 2u (y) = 2x(+2.19)= +4.38 dB
c
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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)
Γ
= 0.2
1
Γ
= 0.67(Bi) 0.3 (Lp)
R
Γ Γ
)
1 R
And U = 2u (y) = 2x(-2.21)= -4.42 dB
c
PROBABILITY
DISTRIBUTION
Normal (k=2)
Normal (k=2)
Rectangular
Rectangular
Rectangular
Rectangular
Rectangular
Rectangular
Rectangular
U-Shaped
Std. Deviation
Normal +2.19 / -2.21
Normal (k=2) +4.38 / -4.42
FCC ID: MXF-WL211F
UNCERTAINTY (+ dB)
3 m 10 m
+1.0 +1.0
+0.3 +0.5
+1.5 +1.5
+0.5 +0.5
+2.0 +0.5
0.0 +0.2
+0.25 +0.25
+0.6 +0.4
+2.0 +2.0
+1.1
+0.5
-1.25
+0.5 +0.5
- -
+1.74 / -1.72
+3.48 / -3.44
File #: GTT-013FTX
March 17, 2000
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