Goto Section: 18.303 | 18.307 | Table of Contents
FCC 18.305
Revised as of October 1, 2011
Goto Year:2010 |
2012
§ 18.305 Field strength limits.
(a) ISM equipment operating on a frequency specified in § 18.301 is
permitted unlimited radiated energy in the band specified for that
frequency.
(b) The field strength levels of emissions which lie outside the bands
specified in § 18.301, unless otherwise indicated, shall not exceed the
following:
Equipment Operating frequency RF Power generated by equipment (watts)
Field strength limit (uV/m) Distance (meters)
Any type unless otherwise specified (miscellaneous) Any ISM frequency
Below 500
500 or more 25
25 *SQRT(power/500) 300
^1300
Any non-ISM frequency Below 500
500 or more 15
15 *SQRT(power/500) 300
^1300
Industrial heaters and RF stabilized arc welders On or below 5,725 MHz
Above 5,725 MHz Any
Any 10
(^2) 1,600
(^2)
Medical diathermy Any ISM frequency
Any non-ISM frequency Any
Any 25
15 300
300
Ultrasonic Below 490 kHz Below 500
500 or more 2,400/F(kHz)
2,400/F(kHz) * SQRT(power/500) 300
^3300
490 to 1,600 kHz
Above 1,600 kHz Any
Any 24,000/F(kHz)
15 30
30
Induction cooking ranges Below 90 kHz
On or above 90 kHz Any
Any 1,500
300 ^430
^430
^1Field strength may not exceed 10 mV/m at 1600 meters. Consumer
equipment operating below 1000 MHz is not permitted the increase in
field strength otherwise permitted here for power over 500 watts.
^2Reduced to the greatest extent possible.
^3Field strength may not exceed 10 mV/m at 1600 meters. Consumer
equipment is not permitted the increase in field strength otherwise
permitted here for over 500 watts.
^4Induction cooking ranges manufactured prior to February 1, 1980,
shall be subject to the field strength limits for miscellaneous ISM
equipment.
(c) The field strength limits for RF lighting devices shall be the
following:
Frequency (MHz) Field strength limit at 30 meters (mV/m)
Non-consumer equipment:
30-88 30
88-216 50
216-1000 70
Consumer equipment:
30-88 10
88-216 15
216-1000 20
Notes
1. The tighter limit shall apply at the boundary between two frequency
ranges.
2. Testing for compliance with these limits may be made at closer
distances, provided a sufficient number of measurements are taken to
plot the radiation pattern, to determine the major lobes of radiation,
and to determine the expected field strength level at 30, 300, or 1600
meters. Alternatively, if measurements are made at only one closer
fixed distance, then the permissible field strength limits shall be
adjusted using 1/d as an attenuation factor.
[ 50 FR 36070 , Sept. 5, 1985, as amended at 51 FR 17970 , May 16, 1986;
52 FR 43197 , Nov. 10, 1987]
Goto Section: 18.303 | 18.307
Goto Year: 2010 |
2012
CiteFind - See documents on FCC website that
cite this rule
Want to support this service?
Thanks!
Report errors in
this rule. Since these rules are converted to HTML by machine, it's possible errors have been made. Please
help us improve these rules by clicking the Report FCC Rule Errors link to report an error.
hallikainen.com
Helping make public information public