Goto Section: 78.18 | 78.20 | Table of Contents
FCC 78.19
Revised as of December 4, 2012
Goto Year:2011 |
2013
§ 78.19 Interference.
(a) Applications for CARS stations shall endeavor to select an
assignable frequency or frequencies which will be least likely to
result in interference to other licensees in the same area since the
FCC itself does not undertake frequency coordination.
(b) Applicants for CARS stations shall take full advantage of all known
techniques, such as the geometric arrangement of transmitters and
receivers, the use of minimum power required to provide the needed
service, and the use of highly directive transmitting and receiving
antenna systems, to prevent interference to the reception of television
STL, television intercity relay, and other CARS stations.
(c)(1) Radio Astronomy and Radio Research Installations. In order to
minimize harmful interference at the National Radio Astronomy
Observatory site located at Green Bank, Pocahontas County, W. Va., and
at the Naval Radio Research Observatory at Sugar Grove, Pendleton
County, W.Va., an applicant for authority to construct a CARS station,
except a CARS pickup station, or for authority to make changes in the
frequency, power, antenna height, or antenna directivity of an existing
station within the area bounded by 39°15′ N. on the north, 78°30′ W. on
the east, 37°30′ N. on the south and 80°30′ W. on the west shall, at
the time of filing such application with the Commission, simultaneously
notify the Director, National Radio Astronomy Observatory, Post Office
Box No. 2, Green Bank, WV 24944, in writing, of the technical
particulars of the proposed station. Such notification shall include
the geographical coordinates of the antenna, antenna height, antenna
directivity if any, proposed frequency, type of emission, and power. In
addition, the applicant shall indicate in his application to the
Commission the date notification was made to the Observatory. After
receipt of such application, the Commission will allow a period of 20
days for comments or objections in response to the notifications
indicated. If an objection to the proposed operation is received during
the 20-day period from the National Radio Astronomy Observatory for
itself or on behalf of the Naval Radio Research Observatory, the
Commission will consider all aspects of the problem and take whatever
action is deemed appropriate.
(2) Any applicant for a new permanent base or fixed station
authorization to be located on the islands of Puerto Rico, Desecheo,
Mona, Vieques, and Culebra, or for a modification of an existing
authorization which would change the frequency, power, antenna height,
directivity, or location of a station on these islands and would
increase the likelihood of the authorized facility causing
interference, shall notify the Interference Office, Arecibo
Observatory, HC3 Box 53995, Arecibo, Puerto Rico 00612, in writing or
electronically, of the technical parameters of the proposal. Applicants
may wish to consult interference guidelines, which will be provided by
Cornell University. Applicants who choose to transmit information
electronically should e-mail to: prcz@naic.edu.
(i) The notification to the Interference Office, Arecibo Observatory
shall be made prior to, or simultaneously with, the filing of the
application with the Commission. The notification shall state the
geographical coordinates of the transmit antenna (NAD-83 datum),
antenna height above ground, ground elevation at the antenna, antenna
directivity and gain, proposed frequency and FCC Rule Part, type of
emission, effective isotropic radiated power, and whether the proposed
use is itinerant. Generally, submission of the information in the
technical portion of the FCC license application is adequate
notification. In addition, the applicant shall indicate in its
application to the Commission the date notification was made to the
Arecibo Observatory.
(ii) After receipt of such applications, the Commission will allow the
Arecibo Observatory a period of 20 days for comments or objections in
response to the notification indicated. The applicant will be required
to make reasonable efforts in order to resolve or mitigate any
potential interference problem with the Arecibo Observatory and to file
either an amendment to the application or a modification application,
as appropriate. If the Commission determines that an applicant has
satisfied its responsibility to make reasonable efforts to protect the
Observatory from interference, its application may be granted.
(iii) The provisions of this paragraph do not apply to operations that
transmit on frequencies above 15 GHz.
(d) Protection for Table Mountain Radio Receiving Zone, Boulder County,
Colorado: Applicants for a station authorization to operate in the
vicinity of Boulder County, Colorado under this part are advised to
give due consideration, prior to filing applications, to the need to
protect the Table Mountain Radio Receiving Zone from harmful
interference. These are the research laboratories of the Department of
Commerce, Boulder County, Colorado. To prevent degradation of the
present ambient radio signal level at the site, the Department of
Commerce seeks to ensure that the field strengths of any radiated
signals (excluding reflected signals) received on this 1800 acre site
(in the vicinity of coordinates 40°07′50″ N Latitude, 105°14′40″ W
Longitude) resulting from new assignments (other than mobile stations)
or from the modification or relocation of existing facilities do not
exceed the following values:
Frequency range In authorized bandwidth of service
Field strength (mV/m) Power flux density ^1(dBW/m^2)
Below 540 kHz 10 −65.8
540 to 1600 kHz 20 −59.8
1.6 to 470 MHz 10 ^2 −65.8
470 to 890 MHz 30 ^2 −56.2
Above 890 MHz 1 ^2 −85.8
^1 Equivalent values of power flux density are caculated assuming free
space characteristic impedance of 376.7=120π ohms.
^2 Space stations shall conform to the power flux density limits at the
earth's surface specified in appropriate parts of the FCC rules, but in
no case should exceed the above levels in any 4 kHz band for all angles
of arrival.
(1) Advance consultation is recomended particularly for those
applicants who have no reliable data which indicates whether the field
strength or power flux density figures in the above table would be
exceeded by their proposed radio facilities (except mobile stations).
In such instances, the following is a suggested guide for determining
whether coordination is recommended:
(i) All stations within 2.4 km (1.5 statute miles);
(ii) Stations within 4.8 km (3 statute miles) with 50 watts or more
effective radiated power (ERP) in the primary plane of polarization in
the azimuthal direction of the Table Mountain Radio Receiving Zone;
(iii) Stations within 16 km (10 statute miles) with 1 kW or more ERP in
the primary plane of polarization in the azimuthal direction of the
Table Mountain Radio Receiving Zone;
(iv) Stations within 80 km (50 statute miles) with 25 kW or more ERP in
the primary plane of polarization in the azimuthal direction of the
Table Mountain Radio Receiving Zone.
(2) Applicants concerned are urged to communicate with the Radio
Frequency Management Coordinator, Department of Commerce, Research
Support Services, NOAA R/E5X2, Boulder Laboratories, Boulder, CO 80303;
telephone (303) 497-6548, in advance of filing their applications with
the Commission.
(3) The Commission will not screen applications to determine whether
advance consultation has taken place. However, applicants are advised
that such consultation can avoid objections from the Department of
Commerce or proceedings to modify any authorization which may be
granted which, in fact, delivers a signal at the site in excess of the
field strength specified herein.
(e) Protection for Federal Communications Commission monitoring
stations:
(1) Applicants in the vicinity of an FCC monitoring station for a radio
station authorization to operate new transmitting facilities or changed
transmitting facilities which would increase the field strength
produced over the monitoring station over that previously authorized
are advised to give consideration, prior to filing applications, to the
possible need to protect the FCC stations from harmful interference.
Geographical coordinates of the facilities which require protection are
listed in § 0.121(c) of the Commission's Rules. Applications for
stations (except mobile stations) which will produce on any frequency a
direct wave fundamental field strength of greater than 10 mV/m in the
authorized bandwidth of service (−65.8 dBW/m2 power flux density
assuming a free space characteristic impedance of 120 ohms) at the
referenced coordinates, may be examined to determine extent of possible
interference. Depending on the theoretical field strength value and
existing root-sum-square or other ambient radio field signal levels at
the indicated coordinates, a clause protecting the monitoring station
may be added to the station authorization.
(2) In the event that calculated value of expected field exceeds 10
mV/m (−65.8 dBW/m2 ) at the reference coordinates, or if there is any
question whether field strength levels might exceed the threshold
value, advance consultation with the FCC to discuss any protection
necessary should be considered. Prospective applicants may communicate
with: Chief, Compliance and Information Bureau, Federal Communications
Commission, Washington, D.C. 20554, Telephone (202) 632-6980.
(3) Advance consultation is suggested particularly for those applicants
who have no reliable data which indicates whether the field strength or
power flux density figure indicated would be exceeded by their proposed
radio facilities (except mobile stations). In such instances, the
following is a suggested guide for determining whether an applicant
should coordinate:
(i) All stations within 2.4 kilometers (1.5 statute miles);
(ii) Stations within 4.8 kilometers (3 statute miles) with 50 watts or
more average effective radiated power (ERP) in the primary plane of
polarization in the azimuthal direction of the Monitoring Stations.
(iii) Stations within 16 kilometers (10 statute miles) with 1 kW or
more average ERP in the primary plane of polarization in the azimuthal
direction of the Monitoring Station;
(iv) Stations within 80 kilometers (50 statute miles) with 25 kW or
more average ERP in the primary plane of polarization in the azimuthal
direction of the Monitoring Station;
(4) Advance coordination for stations operating above 1000 MHz is
recommended only where the proposed station is in the vicinity of a
monitoring station designated as a satellite monitoring facility in
section 0.121(c) of the Commission's Rules and also meets the criteria
outlined in paragraphs (f) (2) and (3) of this section.
(5) The Commission will not screen applications to determine whether
advance consultation has taken place. However, applicants are advised
that such consultation can avoid objections from the Federal
Communications Commission or modification of any authorization which
will cause harmful interference.
(f) Protection to the Federal Government's receive earth station
operations in the Denver, Colorado and Washington D.C. areas in the
17,700 to 19,700 MHz band.
(1) With the exception of applicants for a station authorization to
operate within a 5 km radius of 39°40′23″ N Lat. and 105°13′03″ W Long
(Morrison, CO), applicants will not be authorized to operate within a
50 km radius of 39°43′00″ N Lat. and 104°46′00″ W Long. (Denver, CO)
and within a 50 km radius of 38°48′00″ N Lat. and 76°52′00″ W Long.
(Washington, DC).
(2) To minimize or avoid harmful interference to Government Satellite
Earth Stations located in the Denver, Colorado and Washington, DC
areas, any application for a new station license for MVPD operations in
the 17.7-17.8 GHz band or to operate in the 17.8-19.7 GHz band for any
service, or for modification of an existing station license in these
bands which would change the frequency, power, emission, modulation,
polarization, antenna height or directivity, or location of such a
station, must be coordinated with the Federal Government by the
Commission before an authorization will be issued, if the station or
proposed station is located in whole or in part within any of the areas
defined by the following rectangles or circles:
(i) A circular area within a 5 km radius of 39°40′23″ N Lat. and
105°13′03″ W Long. (Morrison, CO)
(ii) Within the rectangular areas defined as follows (vicinity of
Denver, CO):
Rectangle 1:
41°30′00″ N. Lat. on the north
103°10′00″ W. Long. on the east
38°30′00″ N. Lat. on the south
106°30′00″ W. Long. on the west
Rectangle 2:
38°30′00″ N. Lat. on the north
105°00′00″ W. Long. on the east
37°30′00″ N. Lat. on the south
105°50′00″ W. Long. on the west
Rectangle 3:
40°08′00″ N. Lat. on the north
107°00′00″ W. Long. on the east
39°56′00″ N. Lat. on the south
107°15′00″ W. Long. on the west
(iii) Within the rectangle and circle areas as follows (vicinity of
Washington, DC):
Rectangle
38°40′00″ N. Lat. on the north
78°50′00″ W. Long. on the east
38°10′00″ N. Lat. on the south
79°20′00″ W. Long. on the west or
or
(iv) Within a radius of 178 km of 38°48′00″ N. Lat. / 76°52′00″ W.
Long.
Note to § 78.19: The coordinates cited in this section are specified in
terms of the “North American Datum of 1983 (NAD 83)” with an accuracy
of −30 meters with respect to the “National Spacial Reference System.”
[ 37 FR 3292 , Feb. 12, 1972]
Editorial Note: For Federal Register citations affecting § 78.19,
see the List of CFR Sections Affected, which appears in the Finding
Aids section of the printed volume and at www.fdsys.gov .
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Goto Section: 78.18 | 78.20
Goto Year: 2011 |
2013
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