text stringlengths 65 600 |
|---|
emissions appearing outside of this band shall not exceed the general radiated emission limits in § 15.209.
(d) 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 v... |
ge from 85% to 115% of 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.
[54 FR 17714, Apr. 25, 1989, as amended at 55 FR 33910, Aug. 20, 1990]
<h4 data-hierarchy-metadata='{"path":"/on/2 |
024-04-11/title-47/section-15.231","citation":"47 CFR 15.231"}'>§ 15.231 Periodic operation in the band 40.66-40.70 MHz and above 70 MHz.
(a) The provisions of this section are restricted to periodic operation within the band 40.66-40.70 MHz and above 70 MHz. Except as shown in paragraph (e) of this section, the inten... |
to the transmission of a control signal such as those used with alarm systems, door openers, remote switches, etc. Continuous transmissions, voice, video and the radio control of toys are not permitted. Data is permitted to be sent with a control signal. The following conditions shall be met to comply with the provisi... |
ically deactivate the transmitter within not more than 5 seconds of being released.
(2) A transmitter activated automatically shall cease transmission within 5 seconds after activation.
(3) Periodic transmissions at regular predetermined inte |
rvals are not permitted. However, polling or supervision transmissions, including data, to determine system integrity of transmitters used in security or safety applications are allowed if the total duration of transmissions does not exceed more than two seconds per hour for each transmitter. There is no limit on the n... |
span> Intentional radiators which are employed for radio control purposes during emergencies involving fire, security, and safety of life, when activated to signal an alarm, may operate during the pendency of the alarm condition
(5) Transmission of set-up information for security systems may exceed the transmission ... |
ernal">paragraphs (a)(1) and (a)(2) of this section, provided such transmissions are under the control of a professional installer and do not exceed ten seconds after a manually operated switch is released or a transmitter is activated automatically. Such set-up information may include data.
(b) In addition to the ... |
of § 15.205, the field strength of emissions from intentional radiators operated under this section shall not exceed the following:
Fundamental frequency (MHz)
Field strength of fundamental (microvolts/meter)
Field strength of spurious emissions (microvolts/meter)
40.66-40.70
2,250
225
70-130</td |
>
1,250
125
130-174
1 1,250 to 3,750
1 125 to 375
174-260
3,750
375
260-470
1 3,750 to 12,500
1 375 to 1,250
Above 470
12,500
<td class="ali |
gn-left">1,250
1 Linear interpolations.
(1) The above field strength limits are specified at a distance of 3 meters. The tighter limits apply at the band edges.
(2<span class="paren" |
>) Intentional radiators operating under the provisions of this section shall demonstrate compliance with the limits on the field strength of emissions, as shown in the above table, based on the average value of the measured emissions. As an alternative, compliance with the limits in the above table may be based on the... |
-11/title-47/section-15.35" class="cfr external">§ 15.35 for averaging pulsed emissions and for limiting peak emissions apply. Further, compliance with the provisions of § 15.205 shall be demonstrated using the measurement instrumentation specified in that section.
(3) The limits on the field strength of the spuriou... |
able are based on the fundamental frequency of the intentional radiator. Spurious emissions shall be attenuated to the average (or, alternatively, CISPR quasi-peak) limits shown in this table or to the general limits shown in § 15.209, whichever limit permits a higher field strength.
(c) The bandwidth of the emissi... |
% of the center frequency for devices operating above 70 MHz and below 900 MHz. For devices operating above 900 MHz, the emission shall be no wider than 0.5% of the center frequency. Bandwidth is determined at the points 20 dB down from the modulated carrier.
(d) For devices operating within the frequency band 40.66... |
of the carrier shall be ±0.01%. This frequency tolerance shall be maintained for a temperature variation of −20 degrees to + 50 degrees C at normal supply voltage, and for a variation in the primary supply voltage from 85% to 115% of the rated supply voltage at a temperature of 20 degrees C. For battery operated equipm... |
periodic rate exceeding that specified in paragraph (a) of this section and may be employed for any type of operation, including operation prohibited in paragraph (a) of this section, provided the intentional radiator complies with the provisions of paragraphs (b) through <a href="/on/2024-04-11/title-47/section-15.23... |
cfr external">(d) of this section, except the field strength table in paragraph (b) of this section is replaced by the following:
Fundamental frequency (MHz)
Field strength of fundamental (microvolts/meter)
Field strength of spurious emission (microvolts/meter)
40.66-40.70
1,000
100
<td class="align-lef |
t">70-130
500
50
130-174
500 to 1,5001
50 to 1501
174-260
1,500
150
260-470
1,500 to 5,0001
150 to 5001
Above 470
5,000
<td class="align- |
left">500
1 Linear interpolations.
In addition, devices operated under the provisions of this paragraph shall be provided with a means for automatically limiting operation so that the duration of each transmission shall not be greater than one second and the silent period between transmissions shall be at least 3... |
itation/54-FR-17714" class="fr-reference" data-reference="54 FR 17714">54 FR 17714, Apr. 25, 1989; 54 FR 32340, Aug. 7, 1989, as amended at 68 FR 68546, Dec. 9, 2003; 69 FR 71383, Dec. 9, 2004]
<h4 |
data-hierarchy-metadata='{"path":"/on/2024-04-11/title-47/section-15.233","citation":"47 CFR 15.233"}'>§ 15.233 Operation within the bands 43.71-44.49 MHz, 46.60-46.98 MHz, 48.75-49.51 MHz and 49.66-50.0 MHz.
(a) The provisions shown in this section are restricted to cordless telephones.
(b<spa |
n class="paren">) An intentional radiator used as part of a cordless telephone system shall operate centered on one or more of the following frequency pairs, subject to the following conditions:
(1) Frequencies shall be paired as shown below, except that channel pairing for channels one through fifteen may be accompl... |
transmitter frequencies.
(2) Cordless telephones operating on channels one through fifteen must:
(i) Incorporate an automatic channel selection mechanism that will prevent establishment of a link on any occupied frequency; and
<di |
v id="p-15.233(b)(2)(ii)">
(ii) The box or an instruction manual which is included within the box which the individual cordless telephone is to be marketed shall contain information indicating that some cordless telephones operate at frequencies that may cause interference to nearby TVs and VCRs; to minimize or prevent... |
rienced, moving the cordless telephone farther away from the TV or VCR will often reduce or eliminate the interference. A statement describing the means and procedures used to achieve automatic channel selection shall be provided in any application for equipment authorization of a cordless telephone operating on channe... |
48.760
2
43.740
48.840
3
43.820
48.860
4
43.840
48.920
5
43.920
49.020
6
43.960
49.080
<td cl |
ass="align-left">7
44.120
49.100
8
44.160
49.160
9
44.180
49.200
10
44.200
49.240
11
44.320
49.280
12
<td |
class="align-right">44.360
49.360
13
44.400
49.400
14
44.460
49.460
15
44.480
49.500
16
46.610
49.670
17
46.6 |
30
49.845
18
46.670
49.860
19
46.710
49.770
20
46.730
49.875
21
46.770
49.830
22
46.830
<td class="align- |
right">49.890
23
46.870
49.930
24
46.930
49.990
25
46.970
49.970
(c) The field strength o |
f the fundamental emission 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.
(d) The fundamental emission shall be confined within a 20 kHz band... |
requency shown above, as adjusted by the frequency tolerance of the transmitter at the time testing is performed. Modulation products outside of this 20 kHz band shall be attenuated at least 26 dB below the level of the unmodulated carrier or to the general limits in § 15.209, whichever permits the higher emission leve... |
-11/title-47/section-15.209" class="cfr external">§ 15.209. Tests to determine compliance with these requirements shall be performed using an appropriate input signal as prescribed in § 2.989 of this chapter.
(e) All emissions exceeding 20 microvolts/meter at 3 meters are to be reported in the application for certif... |
5.233(f)">
(f) If the device provides for the connection of external accessories, including external electrical input signals, the device must be tested with the accessories attached. The emission tests shall be performed with the device and accessories configured in a manner which tends to produce the maximum level of... |
"indent-1" data-title="15.233(g)">(g) The frequency tolerance of the carrier signal shall be maintained within ±0.01% of the operating frequency. The tolerance shall be maintained for a temperature variation of −20 degrees C to + 50 degrees C at normal supply voltage, and for variation in the primary voltage from 85% t... |
5.233(h)">
(h) For cordless telephones that do not comply with § 15.214(d) of this part, the box or other package in which the individual cordless telephone is to be marketed shall carry a statement in a prominent location, visible to the buyer before purchase, which reads as follows:
Notice: The base un |
its of some cordless telephones may respond to other nearby units or to radio noise resulting in telephone calls being dialed through this unit without your knowledge and possibly calls being misbilled. In order to protect against such occurrences, this cordless telephone is provided with the following features: (to be... |
ss="citation">[54 FR 17714, Apr. 25, 1989; 54 FR 32340, Aug. 7, 1989, as amended at 56 FR 3785, Jan. 31, 1991; 56 FR 5659, Feb. 12, 1991 |
; 60 FR 21985, May 4, 1995]
§ 15.235 Operation within the band 49.82-49.90 MHz.
(a) The field strength of any emission within this band shall not exceed 10,000 mic |
rovolts/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 of any emissions appearing between the band edges and up to 10 kHz above and below the band edges ... |
low the level of the unmodulated carrier or to the general limits in § 15.209, whichever permits the higher emission levels. The field strength of any emissions removed by more than 10 kHz from the band edges shall not exceed the general radiated emission limits in § 15.209. All signals exceeding 20 microvolts/meter at... |
"15.235(c)">(c) For a home-built intentional radiator, as defined in § 15.23(a), operating within the band 49.82-49.90 MHz, the following standards may be employed:
(1) The RF carrier and modulation products shall be maintained within the band 49.82 |
-49.90 MHz.
(2) The total input power to the device measured at the battery or the power line terminals shall not exceed 100 milliwatts under any condition of modulation.
(3) The antenna shall be a single element, one meter or less in length, |
permanently mounted on the enclosure containing the device.
(4) Emissions outside of this band shall be attenuated at least 20 dB below the level of the unmodulated carrier.
(5) The regulations contained in <a href="/on/2024-04-11/title-47/p |
art-15/section-15.23" class="cfr external">§ 15.23 of this part apply to intentional radiators constructed under the provisions of this paragraph.
(d) Cordless telephones are not permitted to operate under the provisions of this section.
§ 15.236 Operation |
of wireless microphones in the bands 54-72 MHz, 76-88 MHz, 174-216 MHz, 470-608 MHz and 614-698 MHz.
(a) Definitions. The following definitions apply in this section.
(1) Wireless Microphone. |
An intentional radiator that converts sound into electrical audio signals that are transmitted using radio signals to a receiver which converts the radio signals back into audio signals that are sent through a sound recording or amplifying system. Wireless microphones may be used for cue and control communications an... |
15.3#p-15.3(a)" class="cfr external">§ 15.3(a) of this part.
(2) 600 MHz duplex gap. An 11 megahertz guard band at 652-663 MHz that separates part 27 600 MHz service uplink and downlink frequencies.
(3) |
600 MHz guard band. Designated frequency band at 614-617 MHz that prevents interference between licensed services in the 600 MHz service band and channel 37.
(4) 600 MHz service band. Frequencies in the 617-652 MHz and 663-698 MHz bands that are reallocated and reassigned for 600 MHz band services under part 27. ... |
="header">Note to paragraphs (a)(2), (3) and (4):
The specific frequencies will be determined in light of further proceedings pursuant to GN Docket No. 12-268 and the rules will be updated accordingly pursuant to a future public notice.
(5) Spectrum Act. Title VI of the Middle Class Tax Relief and Job Creation Act ... |
//www.govinfo.gov/link/plaw/112/public/96" class="publ external" target="_blank" rel="noopener noreferrer">Pub. L. 112-96).
(b) Operation under this section is limited to wireless microphones as defined in this section.
(c) Operation is permit |
ted in the following frequency bands.
(1) Channels allocated and assigned for the broadcast television service.
(2) Frequencies in the 600 MHz service band on which a 600 MHz service licensee has not commenced operations, as defined in <a href="/on/ |
2024-04-11/title-47/section-27.4" class="cfr external">§ 27.4 of this chapter. Operation on these frequencies must cease no later than the end of the post-auction transition period, as defined in § 27.4 of this chapter. Operation must cease immediately if harmful interference occurs to a 600 MHz service licensee.
(3... |
the 600 MHz duplex gap.
(4) [Reserved]
(5) The 614-616 MHz segment of the 600 MHz guard band.
(6 |
) Prior to operation in the frequencies identified in paragraphs (c)(2) through (5) of this section, wireless microphone users shall rely on the white space databases in part 15, Subpart H to determine that their intended operating frequencies are available for unlicensed wireless microphone operation at the location w... |
and check a white space database to determine available channels prior to beginning operation at a given location. A user must re-check the database for available channels if it moves to another location.
(d) The maximum radiated power shall not exceed the following values:
(1<spa |
n class="paren">) In the bands allocated and assigned for broadcast television and in the 600 MHz service band: 50 mW EIRP
(2) In the 600 MHz guard band and the 600 MHz duplex gap: 20 mW EIRP.
(e) Operation is limited to locati |
ons separated from licensed services by the following distances.
(1) Four kilometers outside the following protected service contours of co-channel TV stations.
Type of station
Protected contour
Channel
Contour
(dBu)
Propagation curve
|
Analog: Class A TV, LPTV, translator and booster
Low VHF (2-6)
47
F(50,50)
High VHF (7-13)
56
F(50,50)
UHF (14-51)
64
F(50,50)
Digital: Full service TV, Class A TV, LPTV, translator and booster
<td class="align-le |
ft">Low VHF (2-6)
28
F(50,90)
High VHF (7-13)
36
F(50,90)
UHF (14-51)
41
F(50,90)
(2)</span |
> The following distances outside of the area where a 600 MHz service licensee has commenced operations, as defined in § 27.4 of this chapter.
Type of station
Separation distance in kilometers
Co-
channel
Adjacent
channel
Base
7
0.2
Mob |
ile
35
31
(f) The operating frequency within a permissible band of operation as defined in paragraph (c) must comply with the following requirements.
(1) The fr |
equency selection shall be offset from the upper or lower band limits by 25 kHz or an integral multiple thereof.
(2) One or more adjacent 25 kHz segments within the assignable frequencies may be combined to form a channel whose maximum bandwidth shall not exceed 200 kHz. The operating bandwidth shall not exceed 200 ... |
ragraph-hierarchy">(3) The frequency tolerance of the carrier signal shall be maintained within ±0.005% 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 primary supply voltage from 85% to 115% of the rated supply voltage at a te... |
s="paren">(g) Emissions within the band from one megahertz below to one megahertz above the carrier frequency shall comply with the emission mask in § 8.3 of ETSI EN 300 422-1 V1.4.2 (2011-08), Electromagnetic compatibility and Radio spectrum Matters (ERM); Wireless microphones in the 25 MHz to 3 GHz frequency range; P... |
itle-47/section-8.4" class="cfr external">section 8.4 of ETSI EN 300 422-1 V1.4.2 (2011-08).
[80 FR 73069, Nov. 23, 2015, as amended at 81 FR 4974, Jan. 29, 2016; 82 FR 41559, Sept. 1, 2017]
<div class=" |
section" id="15.237">
§ 15.237 Operation in the bands 72.0-73.0 MHz, 74.6-74.8 MHz and 75.2-76.0 MHz.
(a) The intentional radiator shall be restricted to use as an auditory assistance device.
(</ |
span>b) Emissions from the intentional radiator shall be confined within a band 200 kHz wide centered on the operating frequency. The 200 kHz band shall lie wholly within the above specified frequency ranges.
(c) The field strength within the permitted 200 kHz band shall not exceed 80 millivolts/meter at 3 meters. Th... |
pecified 200 kHz band shall not exceed the general radiated emissions limits specified in § 15.209. The emission limits in this paragraph are based on measurement instrumentation employing an average detector. The provisions in § 15.35 for limiting peak emissions apply.
[54 FR 17714, Apr. 25, 1989, as am |
ended at 57 FR 13048, Apr. 15, 1992; 78 FR 34927, June 11, 2013]
§ 15.239 Operation in the band 88-108 MHz.
<span class="paragraph-hierarchy" |
>(a) Emissions from the intentional radiator shall be confined within a band 200 kHz wide centered on the operating frequency. The 200 kHz band shall lie wholly within the frequency range of 88-108 MHz.
(b) The field strength of any emissions within the permitted 200 kHz band shall not exceed 250 microvolts/meter at... |
s based on measurement instrumentation employing an average detector. The provisions in § 15.35 for limiting peak emissions apply.
(c) The field strength of any emissions radiated on any frequency outside of the specified 200 kHz band shall not exceed the general radiated emission limits in <a href="/on/2024-04-11/t... |
ternal">§ 15.209.
(d) A custom built telemetry intentional radiator operating in the frequency band 88-108 MHz and used for experimentation by an educational institute need not be certified provided the device complies with the standards in this part and the educational institution notifies the Office of Engineering... |
-15.239(d)(1)">
(1) The dates and places where the device will be operated;
(2) The purpose for which the device will be used;
(3<span |
class="paren">) A description of the device, including the operating frequency, RF power output, and antenna; and,
(4) A statement that the device complies with the technical provisions of this part.
[54 FR 17714, Apr. 25, 1989; <a href="https://www.fed |
eralregister.gov/citation/54-FR-32340" class="fr-reference" data-reference="54 FR 32340">54 FR 32340, Aug. 7, 1989; 80 FR 53750, Sept. 8, 2015]
§ 15.240 Operation in the band 433.5-434.5 MHz.
( |
a) Operation under the provisions of this section is restricted to devices that use radio frequency energy to identify the contents of commercial shipping containers. Operations must be limited to commercial and industrial areas such as ports, rail terminals and warehouses. Two-way operation is permitted to interrogate... |
">(b) The field strength of any emissions radiated within the specified frequency band shall not exceed 11,000 microvolts per meter measured at a distance of 3 meters. The emission limit in this paragraph is based on measurement instrumentation employing an average detector. The peak level of any emissions within the s... |
operation so that the duration of each transmission shall not be greater than 60 seconds and be only permitted to reinitiate an interrogation in the case of a transmission error. Absent such a transmission error, the silent period between transmissions shall not be less than 10 seconds.
(c) The field strength of emi... |
limits in § 15.209.
(d) 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 considered as a separate device subject to its own authorization. Powered tags approved with a device under a single application shall be ... |
number as the device.
(e) To prevent interference to Federal Government radar systems, operation under the provisions of this section is not permitted within 40 kilometers of the following locations:
DoD Radar Site
Latitude
Longitude
Beale Air Force Base
39°08′10″ N |
121°21′04″ W
Cape Cod Air Force Station
41°45′07″ N
070°32′17″ W
Clear Air Force Station
64°55′16″ N
143°05′02″ W
Cavalier Air Force Station
48°43′12″ N
097°54′00″ W
Eglin Air Force Base
30°43′12″ N
<td class=" |
align-left">086°12′36″ W
(f) As a condition of the grant, the grantee of an equipment authorization for a device operating under the provisions of this section shall provide information to the user concerning compliance with the operational restrictions in paragraphs (a) and <a href="/on/2024-04-11/title-47/sec |
tion-15.240#p-15.240(e)" class="cfr external">(e) of this section. As a further condition, the grantee shall provide information on the locations where the devices are installed to the FCC Office of Engineering and Technology, which shall provide this information to the Federal Government through the National Telecommu... |
information provided by the grantee or user to the Commission shall include the name, address, telephone number and e-mail address of the user, the address and geographic coordinates of the operating location, and the FCC identification number of the device. The material shall be submitted to the following address: Ex... |
69 FR 29464, May 24, 2004, as amended at 85 FR 64406, Oct. 13, 2020]
§ 15.241 Operation in the band 174-216 MHz.
<span class="paragraph-hiera |
rchy">(a) Operation under the provisions of this section is restricted to biomedical telemetry devices.
(b) Emissions from the device shall be confined within a 200 kHz band which shall lie wholly within the frequency range of 174-216 MHz.
<span class="pa |
ren">(c) The field strength of any emissions radiated within the specified 200 kHz band shall not exceed 1500 microvolts/meter at 3 meters. The field strength of emissions radiated on any frequency outside of the specified 200 kHz band shall not exceed 150 microvolts/meter at 3 meters. The emission limits in this parag... |
s="section" id="15.242">
§ 15.242 Operation in the bands 174-216 MHz and 470-668 MHz.
(a) The marketing and operation of intentional radiators under the provisions of this section is restricted to biomedical telemetry devices employed solely on the premises of health care facilities.
<p class="i |
ndent-2" data-title="15.242(a)(1)">(1) A health care facility includes hospitals and other establishments that offer services, facilities, and beds for use beyond 24 hours in rendering medical treatment and institutions and organizations regularly engaged in providing medical services through clinics, public health fac... |
"15.242(a)(2)">(2) This authority to operate does not extend to mobile vehicles, such as ambulances, even if those vehicles are associated with a health care facility.
(b) The fundamental emissions from a biomedical telemetry device operating under the provisions of this section shall be contained within a single t... |
broadcast channel, as defined in part 73 of this chapter, under all conditions of operation and shall lie wholly within the frequency ranges of 174-216 MHz and 470-668 MHz.
(c) The field strength of the fundamental emissions shall not exceed 200 mV/m, as measured at a distance of 3 meters using a quasi-peak detecto... |
eak detector function indicates field strength per 120 kHz of bandwidth ±20 kHz. Accordingly, the total signal level over the band of operation may be higher than 200 mV/m. The field strength of emissions radiated on any frequency outside of the television broadcast channel within which the fundamental is contained sha... |
>) The user and the installer of a biomedical telemetry device operating within the frequency range 174-216 MHz, 470-608 MHz or 614-668 MHz shall ensure that the following minimum separation distances are maintained between the biomedical telemetry device and the authorized radio services operating on the same frequenc... |
oadcast station or an associated TV booster station operating within the band 174-216 MHz.
(2) At least 5.5 km outside of the Grade B field strength contour (64 dBuV/m) of a TV broadcast station or an associated TV booster station operating within the bands 470-608 MHz or 614-668 MHz.
<span class="pare |
n">(3) At least 5.1 km outside of the 68 dBuV/m field strength contour of a low power TV or a TV translator station operating within the band 174-216 MHz.
(4) At least 3.1 km outside of the 74 dBuV/m field strength contour of a low power TV or a TV translator station operating within the bands 470-608 MHz or 614-668... |
data-title="15.242(d)(5)">(5) Whatever distance is necessary to protect other authorized users within these bands.
(e) The user and the installer of a biomedical telemetry device operating within the frequency range 608-614 MHz and that will be located within 32 km of the very long baseline array (VLBA) stations o... |
80 km of any of the other radio astronomy observatories noted in footnote US385 of Section 2.106 of this chapter must coordinate with, and obtain the written concurrence of, the director of the affected radio astronomy observatory before the equipment can be installed or operated. The National Science Foundation point ... |
ndent-1" data-title="15.242(f)">(f) Biomedical telemetry devices must not cause harmful interference to licensed TV broadcast stations or to other authorized radio services, such as operations on the broadcast frequencies under subparts G and H of part 74 of this chapter, land mobile stations operating under part 90 of... |
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