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Report No.: EM201300650-1                         Application No.: ZJ00032008                       Page 21 of 42 
 

 

802.11b mode: 

Measurement Conditions:25°C 

Channel 2412MHz 

 

Channel 2472MHz 

 

Report No.: EM201300650-1                         Application No.: ZJ00032008                       Page 22 of 42 
 

 

802.11g mode: 

Measurement Conditions 

Frequency spot with level

≤ -30dBm/100KHz 

Limit  

(MHz) 

Temperature 
(°C) 

Voltage  
(V

AC

) 

FL FH Lower 

Higher 

+25 

Vnom 2401.100 

2482.600 

FL>2400.0   FH< 2483.5 

0 

Vmin 2401.110 

2482.570 

Vmax 2401.130 

2482.580 

+70 

Vmin 2401.120 

2482.590 

Vmax 2401.110 

2482.580 

FL: Lowest frequency of the power envelope, it is the frequency furthest below the frequency of 
maximum power where the output power drops below the level of –80 dBm/Hz spectral power 
density (-30 dBm if measured in a 100 kHz bandwidth) e.i.r.p.. 
FH: Highest frequency of the power envelope, it is the frequency furthest above the frequency of 
maximum power where the output power drops below the level of –80 dBm/Hz spectral power 
density (-30 dBm if measured in a 100 kHz bandwidth) e.i.r.p.. 
Vnom =AC230V/50Hz;Vmin = AC207V/50Hz; Vmax= AC253V/50Hz 

 

Report No.: EM201300650-1                         Application No.: ZJ00032008                       Page 23 of 42 
 

 

802.11g mode: 

Measurement Conditions:25°C 

Channel 2412MHz 

 

Channel 2472MHz 

 

 

Report No.: EM201300650-1                         Application No.: ZJ00032008                       Page 24 of 42 
 

 

A medium access protocol shall be implemented by the equipment. 

On the basis of the latest list of harmonized standards under the R&TTE Directive 1999/5/EC which 

was published on October 23, 2012 in Official Journal C321 contains the following (mandatory) 

guidance: The  efficiency  of  the  various  sharing  mechanisms  can  be  assessed  using  the  

appropriate  clauses  of  EN  300328 version  1.8.1. 

Adaptive equipment using modulations other than FHSS shall implement either of the Detect and 

Avoid mechanisms provided in clauses 4.3.2.5.1 or 4.3.2.5.2. 

This transmitter device is wide band modulations device, and complies with EN 300 328 4.3.5 

standard. This device uses 802.11 protocol which operates in 2400~2483.5MHz band. 802.11b uses a 

radio technology called Direct Sequence Spread Spectrum (DSSS). DSSS transmissions multiply the 

data being transmitted by a "noise" signal. This noise signal is a pseudorandom sequence 

of 1 and −1 values, at a frequency much higher than that of the original signal. The resulting signal 

resembles white noise, like an audio recording of "static". However, this noise-like signal can be used 

to exactly reconstruct the original data at the receiving end, by multiplying it by the same 

pseudorandom sequence. 

802.11b uses a radio technology called orthogonal frequency-division multiplexing (OFDM).

 

OFDM 

is a specialized FDM, the additional constraint is all the carrier signals are orthogonal to each other. In 

OFDM, the sub-carrier frequencies are chosen so that the sub-carriers are orthogonal to each other, 

meaning that cross-talk between the sub-channels is eliminated and inter-carrier guard bands are not 

required. This greatly simplifies the design of both the transmitter and the receiver; unlike 

conventional FDM, a separate filter for each sub-channel is not required.