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Interpretation of FCC certification test items for 2.4GHZ wireless products

Edit: GCDC  Affiliation: Certification Information  Views: 73  Release time: 2022-12-19

If 2.4GHZ wireless products want to be sold in the North American market, they need to apply for FCC ID. Common products include: wireless mouse, wireless keyboard, etc. Due to factors such as product classification and application technology, the certification tests for different products are also different. They are not the same, today we mainly come to understand the content of FCC certification certification requirements and test standard analysis for this kind of product.

 

FCC certification standards:

FCC PART 15.207 Conducted limits

FCC PART 15.209 Radiated emission limits

FCC PART 15.215 Additional provisions to the general radiated emission limitations

FCC PART 15.247 Operation within the bands 902–928 MHz, 2400–2483.5 MHz, and 5725–5850 MHz

FCC PART 15.249 Operation within the bands 902–928 MHz, 2400–2483.5 MHz,5725–5875 MHZ, and 24.0–24.25 GHz

 

FCC certification test requirements:In the FCC PART 15 specification, there are regulations stating the test requirements for products with operating frequencies in the frequency range of 2.4-2.4835Ghz; the main reference standards are 15.247 and 15.249 (the two are in parallel, and 15.249 can be used for devices with low power) , see the table below:

Test standard basis test
project
judgement standard Modulation Remark

FCC Part15.207

Conduction
harass

Frequency of emission   (MHz)

Conducted limit (dBμV)

ALL

Equipment powered only by batteries or not powered by AC is not tested

 

Quasipeak

Average

0.15–0.5

66 to 56*

56 to 46*

0.5–5

56

46

5–30

60

50

FCCPart15.247 (a)(1)

frequency hopping
interval

25KHz

frequency hopping system The two limit standards choose the one with the higher frequency and the one with the higher frequency
or 20dB bandwidth with 2/3 frequency hopping

FCC Part 15.247(a)(1)  (iii)

frequency hopping
Number of channels
at least 15 channels Frequency Hopping System/Digital Modulation

 

reside
time
Within the period of each carrier frequency (the number of frequency hopping channels multiplied by 0.4 seconds), the average time occupied by each occurrence of any frequency shall not exceed 0.4 seconds

 

FCC Part15.247(b)(1)

maximum
Conduction
0.125 watts

 

 

FCC Part15.247(b)(3)

output
power

1 watts

digital modulation Also refer to Test Maximum Conducted Output Power Conducted Output Power

FCC Part15.247(a)(2)

the smallest
6dB bandwidth
At least 500KHz digital modulation

 

FCC Part15.215©

20 dB bandwidth

Unlimited value requirement frequency hopping system

 

FCC Part15.247(d)

edge
bandwidth
At least 20dB below Spread Spectrum/Digital Modulation

 

Or: less than 54dBuV (AV), less than 74dBuV (PEAK),

 

FCC Part15.247(e)

power spectrum
density

≤8dBm @ 3KHz

digital modulation system

 

FCC Part15.247(f)

average
occupy
time
Combined system with frequency hopping operation, the period in seconds (equal to the number of frequency hopping channels multiplied by 0.4 seconds) cannot exceed 0.4 seconds when direct sequence or digital modulation operation is closed. Hybrid system with digital modulation operation When frequency hopping is closed, Should meet the power density required by FCC Part15.247(d) Hybrid system combining frequency hopping and digital modulation techniques

 

The hybrid system working with digital modulation should meet the power density required by FCC Part15.247(d) when the frequency hopping is turned off

FCC Part15.209

radiation
harass
Frequency (MHz) Limit (microvolts/meter) Measuring distance (meters)

ALL

The frequency below 1G is the QP limit

0.009–0.49

2400/F(kHz)

300

0.490–1.705

24000/F(kHz)

30

1.705–30.0

30

30

30–88

100

3

88–216

150

3

216–960

200

3

Above 960

500

3

FCC Part15.249(a)

radiation
field strength
Fundamental field strength

Harmonic Field Strength (microvolts/ meter)

ALL

This limit is the AV value limit, PK value plus 20dB on this basis
Refer to FCC PART15.35

(millivolts/meter)

50

500

 

Magnet reminder
Of course, there are some other parameters such as antenna gain, antenna technical requirements, maximum power, antenna type, etc. that also need to be known during FCC certification. There are various types of 2.4G wireless products currently sold in the North American market, but the FCC test specifications they follow are unified, so the FCC certification of 2.4GHZ wireless products can be carried out according to the requirements in the above table. For specific details, please consult GCDCs.

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