Goto Section: 78.18 | 78.20 | Table of Contents
FCC 78.19
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 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
^1Equivalent values of power flux density are caculated assuming free space
characteristic impedance of 376.7 = 120Ï€ ohms.
^2Space 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 the Public Safety
and Homeland Security Bureau, Federal Communications Commission, Washington,
DC 20554.
(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) 17.7-19.7 GHz band. The following exclusion areas and coordination areas
are established to minimize or avoid harmful interference to Federal
Government earth stations receiving in the 17.7-19.7 GHz band:
(1) No application seeking authority to operate in the 17.7-19.7 GHz band
will be accepted for filing if the proposed station is located within 50 km
of Denver, CO (39°43′ N., 104°46′ W.) or Washington, DC (38°48′ N., 76°52′
W.).
(2) Any application seeking authority for a new fixed station license
supporting the operations of Multichannel Video Programming Distributors
(MVPD) 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 following areas:
(i) Denver, CO area:
(A) Between latitudes 41°30′ N. and 38°30′ N. and between longitudes
103°10′ W. and 106°30′ W.
(B) Between latitudes 38°30′ N. and 37°30′ N. and between longitudes
105°00′ W. and 105°50′ W.
(C) Between latitudes 40°08′ N. and 39°56′ N. and between longitudes
107°00′ W. and 107°15′ W.
(ii) Washington, DC area:
(A) Between latitudes 38°40′ N. and 38°10′ N. and between longitudes
78°50′ W. and 79°20′ W.
(B) Within 178 km of 38°48′ N, 76°52′ W.
(iii) San Miguel, CA area:
(A) Between latitudes 34°39′ N. and 34°00′ N. and between longitudes
118°52′ W. and 119°24′ W.
(B) Within 200 km of 35°44′ N., 120°45′ W.
(iv) Guam area: Within 100 km of 13°35′ N., 144°51′ E.
Note to § 78.19(f): The coordinates cited in this section are specified in
terms of the “North American Datum of 1983 (NAD 83).
[ 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.
return arrow Back to Top
Goto Section: 78.18 | 78.20
Goto Year: 2014 |
2016
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