An overview of FCC regulations

AN4147

4/14

Doc ID 023516 Rev 1

1.2

Parts 15.205 and 15.209

As described in the previous paragraphs, radiated harmonics and spurious emissions of

devices that comply with section 15.231 and which fall within the restricted bands, as

defined in FCC section 15.205, must comply with the radiated emission limits specified in

FCC section 15.209. In addition to the provisions of 15.205, the field strength of emissions

from intentional radiators operated under this section shall not exceed the values in

Table 1.

The field strength limits are specified at a distance of 3 meters.

Section 15.205 shows the bands where only spurious emissions are permitted. The field

strength of emissions appearing within these frequency bands shall not exceed the limits

shown in section 15.209. The following tables show the restricted bands as defined in

section 15.205 and the radiated and conducted emission limits are defined in section

15.209.

260 – 470

3750 to 12500

375 to 1250

Above 470

12500

1250

Table 2.

Field strength of emissions for particular working conditions

Fundamental frequency

[MHz]

Field strength of fundamental

[µV/m]

Field strength of spurious emission

[µV/m]

40.66 – 40.70

1000

100

70 – 130

500

50

130 – 174

500 to 1500

50 to 150

174 – 260

1500

150

260 – 470

1500 to 5000

150 to 500

Above 470

5000

500

Table 1.

Field strength of emissions for normal working conditions (continued)

Fundamental frequency

[MHz]

Field strength of fundamental

[µV/m]

Field strength of spurious emission

[µV/m]

Table 3.

Restricted bands defined in section 15.205

MHz

MHz

MHz

GHz

0.090 – 0.110

16.42 – 16.423

399.9 – 410

4.5 – 5.15

0.495 – 0.505

16.69475 – 16.69525

608 – 614

5.35 – 5.46

2.1735 – 2.1905

16.80425 – 16.80475

960 – 1240

7.25 – 7.75

4.125 – 4.128

25.5 – 25.67

1300 – 1427

8.025 – 8.5

4.17725 – 4.17775

37.5 – 38.25

1435 – 1626.5

9.0 – 9.2

4.20725 – 4.20775

73 – 74.6

1645.5 – 1646.5

9.3 – 9.5

6.215 – 6.218

74.8 – 75.2

1660 – 1710

10.6 – 12.7

6.26775 – 6.26825

108 – 121.94

1718.8 – 1722.2

13.25 – 13.4