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d by telephone companies.
(3) Cable locating equipment operated pursuant to § 15.213.
(4) Any equipment operated under the provisions of <a href="/on/2024-04-11/title-4 |
7/section-15.255" class="cfr external">§§ 15.255 and 15.256 in the frequency band 75-85 GHz, § 15.257 in the 92-95 GHz band or § 15.258.
(5) Biomedical telemetry devices operating under the provi |
sions of § 15.242 of this part are not subject to the restricted band 608-614 MHz but are subject to compliance within the other restricted bands.
(6) Transmitters operating under the provisions of subparts D or <a href="/on/2024-04-11/title-47/part-15/subpart-F |
" class="cfr external">F of this part.
(7) Devices operated pursuant to § 15.225 are exempt from complying with this section for the 13.36-13.41 MHz band only.
(8) |
Devices operated in the 24.075-24.175 GHz band under § 15.245 are exempt from complying with the requirements of this section for the 48.15-48.35 GHz and 72.225-72.525 GHz bands only, and shall not exceed the limits specified in § 15.245(b).
(9) Devices operate |
d in the 24.0-24.25 GHz band under § 15.249 are exempt from complying with the requirements of this section for the 48.0-48.5 GHz and 72.0-72.75 GHz bands only, and shall not exceed the limits specified in § 15.249(a).
(10) White space devices operating under |
subpart H of this part are exempt from complying with the requirements of this section for the 608-614 MHz band.
(e) Harmonic emissions appearing in the restricted bands above 17.7 GHz from field disturbance sensors operating under the provisions of § 15.245 shall not |
exceed the limits specified in § 15.245(b).
[54 FR 17714, Apr. 25, 1989, as amended at 55 FR 46791, Nov. 7, 1990; 56 FR 6288, Feb. 15, |
1991; 57 FR 13048, Apr. 15, 1992; 58 FR 33774, June 21, 1993; 60 FR 28068, May 30, 1995; 61 FR 14503, Apr. 2, 1996; <a href="https: |
//www.federalregister.gov/citation/62-FR-4655" class="fr-reference" data-reference="62 FR 4655">62 FR 4655, Jan. 31, 1997; 62 FR 58658, Oct. 30, 1997; 67 FR 34855, May 16, 2002; 68 FR 68546, Dec. 9, 2003; <a href="https://www.federalregister.gov |
/citation/69-FR-3265" class="fr-reference" data-reference="69 FR 3265">69 FR 3265, Jan. 23, 2004; 69 FR 72031, Dec. 10, 2004; 79 FR 12678, Mar. 6, 2014; 80 FR 73069, Nov. 23, 2015; <a href="https://www.federalregister.gov/citation/84-FR-25691" c |
lass="fr-reference" data-reference="84 FR 25691">84 FR 25691, June 4, 2019]
§ 15.207 Conducted limits.
(a) Except as shown in paragraphs (b) and <a href="/on/2024-04-11/title-47/section-15.2 |
07#p-15.207(c)" class="cfr external">(c) of this section, for an intentional radiator that is designed to be connected to the public utility (AC) power line, the radio frequency voltage that is conducted back onto the AC power line on any frequency or frequencies, within the band 150 kHz to 30 MHz, shall not exceed the... |
minal. The lower limit applies at the boundary between the frequency ranges.
Frequency of emission (MHz)
Conducted limit (dBμV)
Quasi-peak
Average
0.15-0.5
66 to 56*
56 to 46*
0.5-5
56
46
5-30
60 |
50
*Decreases with the logarithm of the frequency.
(b) The limit shown in paragraph (a) of this section shall not apply to carrier current systems operating as intentional radiators on frequencies below 30 MHz. In lieu thereof, |
these carrier current systems shall be subject to the following standards:
(1) For carrier current system containing their fundamental emission within the frequency band 535-1705 kHz and intended to be received using a standard AM broadcast receiver: no limit on conducted emissions.
(</sp |
an>2) For all other carrier current systems: 1000 μV within the frequency band 535-1705 kHz, as measured using a 50 μH/50 ohms LISN.
(3) Carrier current systems operating below 30 MHz are also subject to the radiated emission limits in § 15.205, <a href="/on/2024-04-11/title-47/section-15.209" class="cfr externa |
l">§ 15.209, § 15.221, § 15.223, or § 15.227, as appropriate.
(c) Measurements to demonstrate compliance with the conducted limits are not required for devices which only employ battery power for |
operation and which do not operate from the AC power lines or contain provisions for operation while connected to the AC power lines. Devices that include, or make provisions for, the use of battery chargers which permit operating while charging, AC adapters or battery eliminators or that connect to the AC power lines... |
ce" data-reference="54 FR 17714">54 FR 17714, Apr. 25, 1989, as amended at 56 FR 373, Jan. 4, 1991; 57 FR 33448, July 29, 1992; 58 FR 51249, Oct. 1, 1993; <a href="https://www.federalregister.gov/citation/67-FR-45671" class="fr-reference" data-refer |
ence="67 FR 45671">67 FR 45671, July 10, 2002]
§ 15.209 Radiated emission limits; general requirements.
(a) Except as provided elsewhere in this subpart, the emissions from an intentional radiator shall not exceed the field strength levels specified in the following table: </ |
p>
Frequency (MHz)
Field strength (microvolts/meter)
Measurement distance (meters)
0.009-0.490
2400/F(kHz)
300
0.490-1.705
24000/F(kHz)
30
1.705-30.0
30
30
30-88
<td class="ali |
gn-left">100 **
3
88-216
150 **
3
216-960
200 **
3
Above 960
500
3
** Except as provided in paragraph (g), fundamental emissions from intentional radiators operating under this section shall not be loca |
ted in the frequency bands 54-72 MHz, 76-88 MHz, 174-216 MHz or 470-806 MHz. However, operation within these frequency bands is permitted under other sections of this part, e.g., §§ 15.231 and 15.241.
(b) In the emission table above, the tighter limit applies at the |
band edges.
(c) The level of any unwanted emissions from an intentional radiator operating under these general provisions shall not exceed the level of the fundamental emission. For intentional radiators which operate under the provisions of other sections within this part and which are required to reduce their unwa... |
he unwanted emission and not the fundamental frequency. However, the level of any unwanted emissions shall not exceed the level of the fundamental frequency.
(d) The emission limits shown in the above table are based on measurements employing a CISPR quasi-peak detector except for the frequency bands 9-90 kHz, 110-4... |
n average detector.
(e) The provisions in §§ 15.31, 15.33, and 15.35 for measuring emissions at distances other than the distances specified in the above table, determining the frequency range over which radi |
ated emissions are to be measured, and limiting peak emissions apply to all devices operated under this part.
(f) In accordance with § 15.33(a), in some cases the emissions from an intentional radiator must be measured to beyond the tenth harmonic of the highest fundamental frequency designed to be emitted by the in... |
of the incorporation of a digital device. If measurements above the tenth harmonic are so required, the radiated emissions above the tenth harmonic shall comply with the general radiated emission limits applicable to the incorporated digital device, as shown in § 15.109 and as based on the frequency of the emission be... |
s specified for the intentional radiator, whichever is the higher limit. Emissions which must be measured above the tenth harmonic of the highest fundamental frequency designed to be emitted by the intentional radiator and which fall within the restricted bands shall comply with the general radiated emission limits in ... |
span class="paren">) Perimeter protection systems may operate in the 54-72 MHz and 76-88 MHz bands under the provisions of this section. The use of such perimeter protection systems is limited to industrial, business and commercial applications.
[54 FR 17714, Apr. 25, 1989; 54 FR 32339, Aug. 7, 1989; <a href="https://... |
w.federalregister.gov/citation/55-FR-18340" class="fr-reference" data-reference="55 FR 18340">55 FR 18340, May 2, 1990; 62 FR 58658, Oct. 30, 1997]
§ 15.211 Tunnel radio systems.
An intentional radiator utilized as part of a tunnel radio system may operate on any frequency provided it meets all of the following cond |
itions:
(a) Operation of a tunnel radio system (intentional radiator and all connecting wires) shall be contained solely within a tunnel, mine or other structure that provides attenuation to the radiated signal due to the presence of naturally surrounding earth and/or water.
(b<span class="pare |
n">) Any intentional or unintentional radiator external to the tunnel, mine or other structure, as described in paragraph (a) of this section, shall be subject to the other applicable regulations contained within this part.
(c) The total electromagnetic field from a tunnel radio system on any frequency or frequencie... |
g outside of the tunnel, mine or other structure described in paragraph (a) of this section, shall not exceed the limits shown in § 15.209 when measured at the specified distance from the surrounding structure, including openings. Particular attention shall be paid to the emissions from any opening in the structure to ... |
tle-47/section-15.209" class="cfr external">§ 15.209 refer to the distance from the plane of reference which fits the entire perimeter of each above ground opening.
(d) The conducted limits in § 15.207 apply to the radiofrequency voltage on the public utility power lines outside of the tunnel.
<h |
4 data-hierarchy-metadata='{"path":"/on/2024-04-11/title-47/section-15.212","citation":"47 CFR 15.212"}'>§ 15.212 Modular transmitters.
(a) Single modular transmitters consist of a completely self-contained radiofrequency transmitter device that is typically incorporated into another product, host or device. Split mod... |
ntrol element (or specific hardware on which the software that controls the radio operation resides). All single or split modular transmitters are approved with an antenna. All of the following requirements apply, except as provided in paragraph (b) of this section.
(1) Single modular transmitters must meet the follo... |
ain a modular transmitter approval.
(i) The radio elements of the modular transmitter must have their own shielding. The physical crystal and tuning capacitors may be located external to the shielded radio elements.
(ii) The modular tr |
ansmitter must have buffered modulation/data inputs (if such inputs are provided) to ensure that the module will comply with part 15 requirements under conditions of excessive data rates or over-modulation.
(iii) The modular transmitter must have its own power supply regulation.
<span |
class="paren">(iv) The modular transmitter must comply with the antenna and transmission system requirements of §§ 15.203, 15.204(b) and 15.204(c). The antenna must either be permanently attached or employ a “unique” antenna coupler (at all connections between the module and the antenna, including the cable). T |
he “professional installation” provision of § 15.203 is not applicable to modules but can apply to limited modular approvals under paragraph (b) of this section.
(v) The modular transmitter must be tested in a stand-alone configuration, i.e., the |
module must not be inside another device during testing for compliance with part 15 requirements. Unless the transmitter module will be battery powered, it must comply with the AC line conducted requirements found in § 15.207. AC or DC power lines and data input/output lines connected to the module must not contain fe... |
al of actual use or, if that length is unknown, at least 10 centimeters to insure that there is no coupling between the case of the module and supporting equipment. Any accessories, peripherals, or support equipment connected to the module during testing shall be unmodified and commercially available (see § 15.31(i)). ... |
modular transmitter must be equipped with either a permanently affixed label or must be capable of electronically displaying its FCC identification number.
(A) If using a permanently affixed label, the modular transmitter must be labeled with its own FCC identification number, and, if the FCC identification number is... |
into which the module is installed must also display a label referring to the enclosed module. This exterior label can use wording such as the following: “Contains Transmitter Module FCC ID: XYZMODEL1” or “Contains FCC ID: XYZMODEL1.” Any similar wording that expresses the same meaning may be used. The Grantee may eith... |
ication for equipment authorization.
(B) If the modular transmitter uses an electronic display of the FCC identification number, the information must be readily accessible and visible on the modular transmitter or on the device in which it is installed. If the module is installed inside another device, then the outs... |
enclosed module. This exterior label can use wording such as the following: “Contains FCC certified transmitter module(s).” Any similar wording that expresses the same meaning may be used. The user manual must include instructions on how to access the electronic display. A copy of these instructions must be included i... |
mply with any specific rules or operating requirements that ordinarily apply to a complete transmitter and the manufacturer must provide adequate instructions along with the module to explain any such requirements. A copy of these instructions must be included in the application for equipment authorization.
(viii) R... |
frequency radiation exposure requirements specified in §§ 1.1307(b), 1.1310, 2.1091, and 2.1093 of this chapter, as appropriate. Applications for equipment authorization of modular transmitters under this section must contain a statement confirming compliance with these requirements. The mod |
ular transmitter must comply with any applicable RF exposure requirements in its final configuration. Technical information showing the basis for this statement must be submitted to the Commission upon request.
(2) Split modular transmitters must meet the requirements in paragraph (a)(1) of this section, excluding ... |
s (a)(1)(i) and (a)(1)(v), and the following additional requirements to obtain a modular transmitter approval.
(i) Only the radio front end must be shielded. The physical crystal and tuning capacitors may be located external to the shielded radio elements. The interface between the split sections of the modular syste... |
12(a)(2)(ii)">
(ii) Control information and other data may be exchanged between the transmitter control elements and radio front end.
(iii) The sections of a split modular transmitter must be tested installed in a host device(s) similar to that which is representati |
ve of the platform(s) intended for use.
(iv) Manufacturers must ensure that only transmitter control elements and radio front end components that have been approved together are capable of operating together. The transmitter module must not operate unless it has verified that the installed transmitter control elemen... |
not limited to, coding in hardware and electronic signatures in software to meet these requirements, and must describe the methods in their application for equipment authorization.
(b) A limited modular approval may be granted for single or split modular transmitters that do not comply with all of the above requir... |
pply regulation, if the manufacturer can demonstrate by alternative means in the application for equipment authorization that the modular transmitter meets all the applicable part 15 requirements under the operating conditions in which the transmitter will be used. Limited modular approval also may be granted in those ... |
product is always ensured.
[72 FR 28893, May 23, 2007, as amended at 85 FR 18149, Apr. 1, 2020]
§ 15.213 Cable locating equipment.
An intentional radiator used as cable loca |
ting equipment, as defined in § 15.3(d), may be operated on any frequency within the band 9-490 kHz, subject to the following limits: Within the frequency band 9 kHz, up to, but not including, 45 kHz, the peak output power from the cable locating equipment shall not exceed 10 watts; and, within the frequency band 45 kH... |
ucted limits in § 15.207 also apply to this equipment.
§ 15.214 Cordless telephones.
(a) For equipment authorization, a single application form, FCC Form 731, may be filed for a cordless telephone system, p |
rovided the application clearly identifies and provides data for all parts of the system to show compliance with the applicable technical requirements. When a single application form is submitted, both the base station and the portable handset must carry the same FCC identifier. The application shall include a fee for ... |
ass="paren">) A cordless telephone that is intended to be connected to the public switched telephone network shall also comply with the applicable regulations in part 68 of this chapter. A separate procedure for approval under part 68 is required for such terminal equipment.
(c) The label required under <a href="/on... |
subpart-A" class="cfr external">subpart A of this part shall also contain the following statement: “Privacy of communications may not be ensured when using this phone.”
(d) Cordless telephones shall incorporate circuitry which makes use of a digital security code to provide protection against unintentional access to... |
nctions shall operate such that each access of the telephone network or ringing of the handset is preceded by the transmission of a code word. Access to the telephone network shall occur only if the code transmitted by the handset matches code set in the base unit. Similarly, ringing of the handset shall occur only if ... |
ance with the following provisions.
(1) There must be provision for at least 256 possible discrete digital codes. Factory-set codes must be continuously varied over at least 256 possible codes as each telephone is manufactured. The codes may be varied either randomly, sequentially, or using another systematic procedu... |
-hierarchy">(2) Manufacturers must use one of the following approaches for facilitating variation in the geographic distribution of individual security codes:
(i) Provide a means for the user to readily select from among at least 256 possible discrete digital codes. The cordless telephone shall be either in a non-ope... |
selects a security code or the manufacturer must continuously vary the initial security code as each telephone is produced.
(ii) Provide a fixed code that is continuously varied among at least 256 discrete digital codes as each telephone is manufactured.
(i |
ii) Provide a means for the cordless telephone to automatically select a different code from among at least 256 possible discrete digital codes each time it is activated.
(iv) It is permissible to provide combinations of fixed, automatic, and user-selectable coding provided the above criteria are met.
<p class="i... |
15.214(d)(3)">(3) A statement of the means and procedures used to achieve the required protection shall be provided in any application for equipment authorization of a cordless telephone.
[56 FR 3785, Jan. 31, 1991, as amended at 63 FR 366 |
03, July 7, 1998; 66 FR 7580, Jan. 24, 2001]
Radiated Emission Limits, Additional Provisions
<h4 data-hierarchy-metadata='{"pat |
h":"/on/2024-04-11/title-47/section-15.215","citation":"47 CFR 15.215"}'>§ 15.215 Additional provisions to the general radiated emission limitations.
(a) The regulations in §§ 15.217 through 15.257 provide alternatives to the general radiated emission limits for intentional radiators o |
perating in specified frequency bands. Unless otherwise stated, there are no restrictions as to the types of operation permitted under these sections.
(b) In most cases, unwanted emissions outside of the frequency bands shown in these alternative provisions must be attenuated to the emission limits shown in § 15.209... |
unwanted emissions from an intentional radiator operating under these additional provisions exceed the field strength of the fundamental emission.
(c) Intentional radiators operating under the alternative provisions to the general emission limits, as contained in §§ 15.217 through 15 |
.257 and in subpart E of this part, must be designed to ensure that the 20 dB bandwidth of the emission, or whatever bandwidth may otherwise be specified in the specific rule section under which the equipment operates, is contained within the frequency band designated in the rule section under which the equipment is op... |
quirement to contain the designated bandwidth of the emission within the specified frequency band includes the effects from frequency sweeping, frequency hopping and other modulation techniques that may be employed as well as the frequency stability of the transmitter over expected variations in temperature and supply ... |
ref="https://www.federalregister.gov/citation/54-FR-17714" class="fr-reference" data-reference="54 FR 17714">54 FR 17714, Apr. 25, 1989, as amended at 62 FR 45333, Aug. 27, 1997; 67 FR 34855, May 16, 2002; 69 FR 3265, Jan. 23, 2004; <a href="https |
://www.federalregister.gov/citation/70-FR-6774" class="fr-reference" data-reference="70 FR 6774">70 FR 6774, Feb. 9, 2005; 79 FR 24578, May 1, 2014]
§ 15.216 [Reserved]
§ |
15.217 Operation in the band 160-190 kHz.
(a) The total input power to the final radio frequency stage (exclusive of filament or heater power) shall not exceed one watt.
(b) The total length of the transmission line, antenna, and ground lead (if used) shall not |
exceed 15 meters.
(c) All emissions below 160 kHz or above 190 kHz shall be attenuated at least 20 dB below the level of the unmodulated carrier. Determination of compliance with the 20 dB attenuation specification may be based on measurements at the intentional radiator's antenna output terminal unless the intentio... |
the radiated emissions.
§ 15.219 Operation in the band 510-1705 kHz.
(a) The total input power to the final radio frequency stage (exclusive of filament or heater power) shall not exceed 100 milliwatts.
<p class="indent-1" data-title="15.2 |
19(b)">(b) The total length of the transmission line, antenna and ground lead (if used) shall not exceed 3 meters.
(c) All emissions below 510 kHz or above 1705 kHz shall be attenuated at least 20 dB below the level of the unmodulated carrier. Determination of compliance with the 20 dB attenuation specification may b... |
urements at the intentional radiator's antenna output terminal unless the intentional radiator uses a permanently attached antenna, in which case compliance shall be deomonstrated by measuring the radiated emissions.
§ 15.221 Operation in the band 525-1705 kHz.
(a) Carrier |
current systems and transmitters employing a leaky coaxial cable as the radiating antenna may operate in the band 525-1705 kHz provided the field strength levels of the radiated emissions do not exceed 15 uV/m, as measured at a distance of 47,715/(frequency in kHz) meters (equivalent to Lambda/2Pi) from the electric po... |
class="indent-1" data-title="15.221(b)">(b) As an alternative to the provisions in paragraph (a) of this section, intentional radiators used for the operation of an AM broadcast station on a college or university campus or on the campus of any other education institution may comply with the following:
<spa |
n class="paren">(1) On the campus, the field strength of emissions appearing outside of this frequency band shall not exceed the general radiated emission limits shown in § 15.209 as measured from the radiating source. There is no limit on the field strength of emissions appearing within this frequency band, except tha... |
="indent-2" data-title="15.221(b)(2)">(2) At the perimeter of the campus, the field strength of any emissions, including those within the frequency band 525-1705 kHz, shall not exceed the general radiated emission in § 15.209.
(3) The conducted limits |
specified in § 15.207 apply to the radio frequency voltage on the public utility power lines outside of the campus. Due to the large number of radio frequency devices which may be used on the campus, contributing to the conducted emissions, as an alternative to measuring conducted emissions outside of the campus, it is... |
iv id="p-15.221(c)">
(c) A grant of equipment authorization is not required for intentional radiators operated under the provisions of this section. In lieu thereof, the intentional radiator shall be verified for compliance with the regulations in accordance with subpart J of part 2 of this chapter. This data shall be ... |
associated with the transmitting equipment. In some cases, this may correspond to the location of the transmitting equipment.
(d) For the band 535-1705 kHz, the frequency of operation shall be chosen such that operation is not within the protected field strength contours of licensed AM stations.
[<a href="https://w... |
56 FR 373">56 FR 373, Jan. 4, 1991]
§ 15.223 Operation in the band 1.705-10 MHz.
(a) The field strength of any emission within the band 1.705-10.0 MHz shall not exceed 100 microvolts/meter at a distance of 30 meters. However, if the bandwidth of the emission is less than 10% |
of the center frequency, the field strength shall not exceed 15 microvolts/meter or (the bandwidth of the device in kHz) divided by (the center frequency of the device in MHz) microvolts/meter at a distance of 30 meters, whichever is the higher level. For the purposes of this section, bandwidth is determined at the poi... |
ak emissions apply.
(b) The field strength of emissions outside of the band 1.705-10.0 MHz shall not exceed the general radiated emission limits in § 15.209.
§ 15.225 Operation within the band 1 |
3.110-14.010 MHz.
(a) The field strength of any emissions within the band 13.553-13.567 MHz shall not exceed 15,848 microvolts/meter at 30 meters.
(b) Within the bands 13.410-13.553 MHz and 13.567-13.710 MHz, the field strength of any emissions shall not exceed |
334 microvolts/meter at 30 meters.
(c) Within the bands 13.110-13.410 MHz and 13.710-14.010 MHz the field strength of any emissions shall not exceed 106 microvolts/meter at 30 meters.
(d) The field strength of any emissions appearing outside of the 13.1 |
10-14.010 MHz band shall not exceed the general radiated emission limits in § 15.209.
(e) The frequency tolerance of the carrier signal shall be maintained within ±0.01% of the operating frequency over a temperature variation of −20 degrees to + 50 degrees C at normal supply voltage, and for a variation in the prima... |
f the rated supply voltage at a temperature of 20 degrees C. For battery operated equipment, the equipment tests shall be performed using a new battery.
(f) In the case of radio frequency powered tags designed to operate with a device authorized under this section, the tag may be approved with the device or be consid... |
application shall be labeled with the same identification number as the device.
[68 FR 68546, Dec. 9, 2003]
§ 15.227 Operation within the band 26.96-27.28 MHz.
(a<sp |
an class="paren">) The field strength of any emission within this band shall not exceed 10,000 microvolts/meter at 3 meters. The emission limit in this paragraph is based on measurement instrumentation employing an average detector. The provisions in § 15.35 for limiting peak emissions apply.
(b) The field strength o... |
ppear outside of this band shall not exceed the general radiated emission limits in § 15.209.
§ 15.229 Operation within the band 40.66-40.70 MHz.
(a) Unless operating pursuant to the provisions in <a |
href="/on/2024-04-11/title-47/section-15.231" class="cfr external">§ 15.231, the field strength of any emissions within this band shall not exceed 1,000 microvolts/meter at 3 meters.
(b) As an alternative to the limit in paragraph (a) of this section, perimeter protection systems may demonstrate compliance with the ... |
strength of any emissions within this band shall not exceed 500 microvolts/meter at 3 meters, as determined using measurement instrumentations employing an average detector. The provisions in § 15.35 for limiting peak emissions apply where compliance of these devices is demonstrated under this alternative emission lim... |
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